Swiss international tax law is primarily based on Switzerland’s network of double taxation agreements (DTAs) and other bilateral or multilateral agreements, as interpreted and applied under Swiss domestic tax legislation, and complemented by administrative practice and case law.

Switzerland is a federal state. Taxes are levied at federal, cantonal and communal levels; accordingly, cross-border matters are covered by a combination of federal acts, the relevant cantonal provisions and potential applicable international treaties, depending on the case at hand.

Swiss international tax law also includes domestic conflict rules and unilateral mechanisms to eliminate international double taxation. In practice, administrative guidance (including circulars and safe harbour practices, notably in areas such as thin capitalisation and interest rates in intra-group financing) and the case law of the Swiss Federal Supreme Court (SFSC) are key for the interpretation and application of these rules.

As of March 2026, Switzerland has DTAs with over 100 countries, mainly covering taxes on income and wealth/capital. A limited number of DTAs do not cover wealth/capital tax. Switzerland also has a limited treaty network for inheritance and estate taxes (currently eight agreements). In addition, the cantons may conclude treaties with foreign states in areas falling within their areas of competency. In practice, a limited number of cantonal agreements exist in international tax matters, notably in relation to international inheritance taxation or gifts made to public-benefit institutions, and the taxation of cross-border workers.

With respect to internationally recognised standards, OECD publications, reports and guidelines are commonly used as an interpretative tool by administrative authority and courts, especially where Swiss law applies treaty concepts (eg, in transfer pricing).

Switzerland applies a monist approach, meaning that, once validly ratified, international law (in particular, DTAs) forms part of the domestic legal order and is, as a rule, applied by the Swiss authorities without requiring a separate act of implementation.

According to the Swiss Federal Constitution (SFC), both the Confederation and the cantons must respect international law, including treaties and DTAs. The Constitution also provides that the SFSC and other authorities are required to apply both international law and federal laws. Treaty provisions are applied directly to the extent they are sufficiently clear and precise (self-executing); where this is not the case, implementing legislation is required.

As a rule, domestic law is interpreted in a treaty-conform manner; where a conflict cannot be resolved by interpretation, international law generally prevails. This reflects the obligation to interpret treaties in good faith (pacta sunt servanda, Article 26 of the Vienna Convention on the Law of Treaties), while Swiss case law recognises limited exceptions in specific constellations.

DTAs typically have a “negative” effect only: they restrict and allocate taxing rights between the contracting states to avoid double taxation but do not, in themselves, create a tax liability. Taxation in Switzerland therefore always requires a legal basis in Swiss domestic law.

In Switzerland, treaty practice is essentially based on the OECD Model Tax Convention (OECD MTC). Switzerland has been a member of the OECD since its creation, and most Swiss DTAs follow the OECD MTC in terms of structure and core concepts.

Even if the OECD MTC and the OECD Commentary are not formal sources of law, they are widely used as interpretative guidance for the application of Swiss DTAs. This guidance is reflected in federal and cantonal administrative practices, and is regularly mentioned in case law.

The UN Model does not drive Swiss treaty policy. Elements that are more typical for UN-oriented treaties may nevertheless be found in individual agreements, depending on the treaty partner and the negotiated balance of taxing rights.

In Switzerland’s tax treaty network, there are no systematic deviations from the OECD MTC. Rather, deviations are treaty-specific and can concern:

• the scope of covered taxes;
• residual withholding tax rates and specific source-state taxing rights; and
• the inclusion of specific anti-abuse and administrative assistance/exchange of information provisions, which have been increasingly aligned with BEPS minimum standards through protocols and treaty updates.

Switzerland signed the Multilateral Instrument on 7 June 2017 and deposited its instrument of ratification on 29 August 2019. The MLI entered into force for Switzerland on 1 December 2019.

In Switzerland, the territorial scope of taxation is determined by the distinction between unlimited tax liability based on a personal connection and limited tax liability based on an economic connection.

Individuals who have their tax residence in Switzerland (domicile or “tax relevant stay” – see 2.2 Tax Residence of Individuals), and legal entities whose registered seat or place of effective management is in Switzerland (see 2.5 Tax Residence of Legal Entities), are in principle subject to unlimited tax liability and are taxed on their worldwide income/profits and wealth/capital, subject to the usual limitations and relief for certain foreign items (eg, foreign permanent establishments and foreign immovable property).

By contrast, persons and entities without such personal affiliation are subject to limited tax liability and are taxed only on Swiss-source income and assets to the extent a sufficient Swiss nexus exists (typically Swiss-based real estate, a Swiss permanent establishment or business operation, or other taxable Swiss-source items).

Switzerland’s structure as a federal state is an important feature of taxation. As taxes are levied at federal, cantonal and coaligned levels, the effective tax burden largely depends on the canton and municipality of residence or seat, despite the fact that the conditions to determine unlimited and limited tax liability are mostly aligned.

Domestic Provision

From a domestic standpoint, individuals’ tax residence in Switzerland (unlimited tax liability) is triggered if they are domiciled in Switzerland or have a “tax-relevant stay” in Switzerland.

A person is considered to be domiciled in Switzerland for tax purposes if they reside in Switzerland with the intention of remaining there on a durable basis. This assessment is based on objective circumstances; a tax domicile may also arise from a special legal domicile provided for under federal law. If the situation is not clear, the tax authorities determine the tax domicile by reference to the strongest personal and economic ties (centre of vital interests), based on an overall assessment of the facts; purely subjective preferences are not decisive in themselves.

A stay in Switzerland triggers tax residence when the individual remains physically in Switzerland for at least 30 days while engaging in gainful activity, or for at least 90 days without gainful activity, without significant interruption.

Treaty Provision

Where an individual is treated as being tax resident in Switzerland and in another jurisdiction under its respective domestic rules, the applicable DTA will typically resolve the conflict through the tie-breaker rules of Article 4 of the OECD MTC.

In principle, the individual is deemed to be resident only of the state where they have a permanent home available; if a permanent home is available in both states, residence is assigned to the state with which personal and economic relations are closer (centre of vital interests). If the centre of vital interests cannot be determined (or if no permanent home is available in either state), the tie-breaker rule turns to habitual abode, then nationality, and ultimately a mutual agreement between the competent authorities.

Unlimited Tax Liability

Individuals who are tax resident in Switzerland are, as a rule, subject to unlimited tax liability and are taxed on their worldwide income for purposes of direct taxes at the federal, cantonal and communal levels. In addition, they are generally subject to cantonal and communal wealth tax on their worldwide net wealth.

Exemption Mechanism

Domestic Swiss law and DTAs provide for mechanisms to avoid international double taxation. For example, income attributable to foreign businesses/permanent establishments and income from immovable property located abroad are generally excluded from Swiss taxation, although they must typically still be declared and taken into account to set the tax rate. For other categories of foreign-source income, relief is typically granted under the applicable DTA (and, in some cases, under domestic unilateral relief rules), usually by way of exemption or, more rarely, foreign tax credit, depending on the income category and the relevant treaty provisions.

Lump Sum Taxation

Swiss tax law also allows individual taxpayers to voluntarily opt for a lump sum taxation (imposition d’après la dépense/Besteuerung nach dem Aufwand). In principle, this regime is available only to individuals who:

• do not have Swiss citizenship;
• become Swiss tax residents for the first time or after an absence of at least ten years; and
• do not carry out any gainful activity in Switzerland.

Under this regime, income tax is assessed based on the taxpayer’s annual living expenses (including those incurred abroad for the taxpayer and dependants), subject to statutory minimum bases and a control calculation. Cantonal law and practice may impose lower or higher minimum assessment bases, and certain cantons have abolished this regime altogether.

Domestic Provision

Under Swiss domestic tax laws, individuals who, for Swiss tax purposes, are neither domiciled nor tax-resident by virtue of a stay in Switzerland are subject to Swiss taxation only based on an economic affiliation. This generally covers both (i) business or real-estate nexus and (ii) certain specifically listed Swiss-source income.

A taxable economic affiliation exists where:

• the individual is the owner or usufructuary of a business in Switzerland, or holds an interest therein as a partner;
• the individual operates a permanent establishment in Switzerland;
• the individual owns Swiss real estate or holds rights in rem, or personal rights economically equivalent to rights in rem, over Swiss real estate; or
• the individual trades in Swiss real estate or acts as an intermediary in Swiss real estate transactions.

Limited tax liability also arises where the individual derives certain Swiss-source income, notably where:

• they carry on gainful employment or self-employment in Switzerland;
• they are employed by an employer with its seat, place of effective management or a permanent establishment in Switzerland and Switzerland is granted taxing rights over work performed abroad under the relevant cross-border treaty arrangement;
• they receive directors’ fees or similar remuneration as members of the board or management of a legal entity having its seat or a permanent establishment in Switzerland;
• they are the holder or usufructuary of receivables secured by a mortgage or pledge over Swiss real estate;
• they receive pensions or similar benefits linked to a public law activity carried out for the account of third parties from a Swiss employer or Swiss pension institution;
• they receive income from Swiss private law institutions connected with occupational pension provision or recognised forms of tied individual pension provision; or
• they receive remuneration for activities in international traffic (ship, aircraft or road transport) from an employer with its seat, place of effective management or permanent establishment in Switzerland, subject to the statutory exemption for seafarers on Swiss-flag vessels operated by such an employer.

In addition, some cantons levy a distinct tax on the sale of immovable property (see 3.1 Income From Immovable Property).

Domestic Taxation Procedure

The method used to levy Swiss taxes usually depends on the nature of the income. Employment income is frequently collected by way of tax at source (imposition à la source, Quellensteuer) where the employee is not tax resident in Switzerland (and in some cases for foreign nationals resident in Switzerland), with subsequent ordinary assessment only in cases provided for by law. By contrast, income derived from Swiss permanent establishment or from Swiss-based real estate is generally assessed under the ordinary assessment procedure, and the taxpayer must submit a complete Swiss tax return.

Treaty Provision

In addition to the domestic rules, the applicable tax treaty provision should also be analysed, as the scope of Swiss taxing rights is often limited by said applicable DTA. In particular, treaties may:

• require the existence of a permanent establishment for Switzerland to tax business profits;
• allocate employment income based on the place where the work is physically performed (subject to specific treaty exceptions, such as short-term assignments); and
• restrict or cap Swiss taxation on certain Swiss-source items, or oblige Switzerland to grant relief from double taxation where Switzerland’s domestic law would otherwise tax the income.

Under Swiss tax law, a legal entity is generally regarded as being tax resident in Switzerland if either its statutory seat (ie, the place of incorporation/registration) or its place of effective management is in Switzerland.

The place of effective management is determined based on the factual circumstances. According to case law from the SFSC, it corresponds to the place where the entity’s actual and economic centre of activity is carried out (ie, where its day-to-day business is directed and/or where management decisions are effectively taken) rather than where purely formal functions are performed.

By contrast, transparent entities (notably partnerships) are not treated as separate taxpayers for corporate income tax purposes; the tax nexus is generally assessed at the level of the partners rather than at entity level.

Domestic Definition

Swiss domestic tax law contains an express definition of a permanent establishment. In principle, a permanent establishment is a fixed place of business through which the business activity of an enterprise (or the activity of a person exercising an independent profession) is performed in whole or in part. The statutory examples include a place of management, a branch, a factory, a workshop, a sales office, a permanent representation, a mine or other place of extraction of natural resources, and a building site or construction/installation project that continues for at least 12 months.

Treaty Provision

In cross-border situations, the applicable DTA definition of permanent establishment is generally decisive for the allocation of taxing rights, and Switzerland’s treaty practice is largely aligned with Article 5 of the OECD MTC.

There is no systematic deviation from the OECD MTC; deviations are rather treaty-specific and depend on the negotiation power with Switzerland and its respective treaty partner. In practice, differences may arise in relation to:

• the construction site threshold (which may differ from 12 months in certain treaties);
• treaty-specific extensions, such as service permanent establishment concepts in some agreements; and
• the detailed drafting of agency and anti-fragmentation rules as treaties are updated in line with international standards.

In Switzerland, income from immovable property is, in principle, taxed in the canton where the property is located. For Swiss tax resident individuals, rental income from Swiss real estate (and, under the current system, the notional rental value for owner-occupied property) is included in taxable income at the federal, cantonal and communal levels, while the property itself is generally subject to cantonal and communal wealth tax.

Swiss voters abolished the taxation of notional rental value in 2025, simultaneously restricting certain deductions. Entry into force is planned for 2029.

Gains realised on the sale of Swiss real estate are taxed at the cantonal level. Private individuals are subject to a specific real estate capital gains tax on the disposal of Swiss real property, whereas gains realised through a commercial real estate activity (or by corporate taxpayers) may fall under ordinary income/profit taxation or under cantonal real estate gains tax rules, depending on the cantons.

For non-resident individuals, Swiss real estate typically triggers limited tax liability in Switzerland. As a rule, Switzerland taxes the non-resident on Swiss-source rental income (and, currently, the notional rental value) and on Swiss real estate capital gains in the canton of situs, subject to any limitations or allocation rules under the applicable DTA.

For Swiss residents, immovable property abroad is generally not taxed but is typically taken into account to set the applicable tax rate. Treaty provisions usually confirm the situs principle reflected in Article 6 of the OECD MTC.

In addition, some DTAs concluded by Switzerland depart from the OECD MTC approach for immovable property held through real estate companies. For example, the Switzerland–France DTA gives France the right to tax shares in a French real estate company (société civile immobilière, or SCI), while Switzerland must, in principle, exempt income and gains that are allocated to France under the treaty. However, the treaty also provides that the exemption is granted only if the taxpayer can show that the relevant income, capital gains or wealth elements have been effectively taxed in France.

In substance, the SFSC considers that it is a “subject-to-tax” clause: Switzerland grants the exemption only if effective taxation occurs in France; otherwise, Switzerland may tax the SCI shares (including for wealth tax purposes).

In a cross-border context, business profits are taxed in Switzerland based on the distinction between unlimited and limited tax liability and, in treaty cases, by reference to the allocation rules for business profits (in particular, the permanent establishment threshold).

A Swiss-resident corporation is, in principle, subject to unlimited tax liability and is taxed on its worldwide business profits, subject to the usual exclusions for profits attributable to foreign permanent establishments and foreign immovable property, which are generally exempt from Swiss corporate income tax under the exemption method.

Conversely, a non-resident legal entity is subject to Swiss corporate income tax only to the extent it has a Swiss nexus – typically a permanent establishment in Switzerland. In that case, Switzerland taxes only the profits attributable to the Swiss permanent establishment, in line with the applicable treaty framework and domestic profit allocation principles.

The Swiss tax base is generally based on the company’s statutory financial statements prepared under Swiss commercial law, subject to specific tax adjustments. In cross-border situations, these adjustments often include corrections related to intra-group transactions, in particular transfer pricing adjustments and recharacterisations, such as hidden profit distributions, as well as the application of domestic safe harbour practices related to intra-group financing (eg, interest rates or thin capitalisation parameters).

In Switzerland, dividends, interest and royalties are, in principle, part of the taxable income base of both individuals and corporate taxpayers. In a cross-border context, the tax outcome is largely driven by:

• the domestic rules on ordinary income/profit taxation;
• the scope of the Swiss withholding tax (WHT); and
• the relief mechanisms available under the applicable DTA.

From a direct tax perspective, Switzerland provides relief to mitigate economic double taxation on qualifying participations. Corporate taxpayers may benefit from the participation relief on qualifying dividend income (and, under the relevant conditions, on capital gains – see 3.4 Capital Gains), which reduces the taxable profit proportionally; for dividends, a participation generally qualifies if it represents at least 10% of the share capital (or profit and reserves) of the distributing entity or has a fair market value of at least CHF1 million.

Private individuals benefit from partial taxation of dividends from qualifying participations (generally a minimum shareholding of 10%), with an inclusion rate of 70% at the federal level and a cantonal inclusion rate that must be at least 50% (subject to cantonal law).

Switzerland levies a federal WHT, which operates either as a safeguard tax or as a final tax, depending on the context. It is generally levied at a rate of 35% on Swiss-source investment income and lottery winnings, and at lower rates for certain insurance-type benefits. The tax is notably levied on:

• dividends and comparable profit distributions by Swiss corporations;
• certain categories of interest – notably, interest on Swiss bonds and “bond-like” financings (including structures that fall under the Swiss “bond/bond-like loan” practice);
• interest paid by Swiss banks (and entities treated as banks for these purposes) to non-banks; and
• income paid by Swiss collective investment schemes (ie, funds).

Royalties are generally not subject to Swiss WHT; however, in related-party contexts an excessive royalty (or other excessive remuneration) may be recharacterised as a hidden profit distribution and trigger WHT at the level of the Swiss payer.

From a technical perspective, Swiss WHT is a self-assessment tax collected at source by the Swiss debtor/paying agent; late-payment interest can accrue if the tax is not duly reported and paid.

Swiss-resident recipients are, in principle, entitled to a full refund of WHT, provided the conditions are met. In particular, the claimant must be the beneficial owner of the assets generating the taxable income at the time the taxable benefit becomes due (ie, the effective recipient), and the relevant income and underlying assets must be properly declared for Swiss tax purposes. However, a refund is excluded where the structure is linked with tax evasion or constitutes an abuse of rights (see 5.2 Anti-Avoidance Mechanisms). Subject to certain conditions, Swiss law allows the use of a “declaration procedure” (ie, the reporting of the WHT instead of its payment), which can eliminate the cash burden (ie, payment followed by a refund).

For non-resident recipients, relief is generally available to the extent provided by the applicable DTA, whether by way of a refund procedure or via a “declaration procedure”.

Finally, a deemed dividend/hidden profit distribution can trigger WHT exposure at 35% and, in certain circumstances, gross-up mechanics may result in a substantially higher effective burden.

Private capital gains on movable assets are generally tax-exempt in Switzerland, subject to certain exceptions. This exemption presupposes that the individual’s activity does not amount to a commercial activity.

By contrast, capital gains realised on commercial assets are generally subject to ordinary taxation. An exception applies to gains realised on the disposal of qualified participations (ie, at least a 10% participation in a corporation; see 3.3 Passive Income), which are only included in the tax base at 70% at the federal level and a cantonal inclusion rate that must be at least 50% (subject to cantonal law).

Likewise, capital gains realised by corporate taxpayers are, in principle, subject to ordinary corporate income taxation, except that gains on the disposal of qualified participations benefit from participation relief (see 3.3 Passive Income).

Resident

For Swiss tax residents, all income from gainful activity is taxable, whether received as a one-off payment or on a recurring basis. This includes all remuneration from employment relationships governed by private or public law, such as salary and ancillary benefits (eg, allowances, commissions, bonuses, profit-sharing and any benefits arising from employee participation plans).

Income from self-employment is also taxable and includes all revenues derived from the operation of a commercial, industrial, artisanal, agricultural or forestry enterprise, from the exercise of a liberal profession, or from any other independent gainful activity.

Non-Resident

Non-resident individuals performing dependent employment in Switzerland are subject to Swiss taxation on their Swiss-source employment income, which is typically collected by way of tax at source by the Swiss employer. In addition, benefits derived from stock options are taxed proportionally based on the ratio between the total benefit and the period spent working in Switzerland, even if the options are exercised after the taxpayer has ceased working in Switzerland.

Where relevant, Swiss tax treaties typically include specific provisions regarding directors’ fees, pensions, and income of artists and sportspeople, generally in line with the OECD MTC.

Switzerland has not yet implemented Amount B through specific domestic rules. In practice, transfer pricing in Switzerland is applied on the basis of the arm’s length principle with reference to the OECD transfer pricing guidance as an interpretative tool. Accordingly, any application of Amount B would be expected to arise through OECD-aligned practice rather than through a bespoke Swiss implementation, and no Switzerland-specific deviations have been introduced to date.

Amount A under Pillar One would require implementation through a multilateral agreement. Negotiations within the OECD/G20 Inclusive Framework Task Force on the Digital Economy have been ongoing since November 2021, but no final Pillar One package has yet been adopted.

Switzerland has consistently supported consensus-based decision-making within the Inclusive Framework. The State Secretariat for International Finance (SIF) has participated in the negotiations and represented Switzerland’s positions. If Pillar One were adopted at Inclusive Framework level, the Federal Council would decide whether Switzerland should sign the MLC. For subsequent ratification, approval from the Parliament would also be required, and any ratification would require parliamentary approval.

In January 2022, the Federal Council decided to introduce the minimum tax rate by way of a constitutional amendment. A referendum was held on 18 June 2023, and the constitutional basis was approved. Despite calls from political and economic circles to defer implementation until 2025, the Federal Council enacted a temporary ordinance with effect from 1 January 2024, introducing the qualified domestic minimum top-up tax (QDMTT).

On 4 September 2024, the Federal Council decided to bring the Income Inclusion Rule (IIR) into force with effect from 1 January 2025. The Federal Council has six years to present a federal law that will replace the ordinance.

Due to international criticism, Switzerland has decided to postpone the entry into force of the Undertaxed Profits Rule (UTPR).

On 12 September 2025, the Federal Council adopted the dispatch approving the international legal framework for the exchange of information under the OECD minimum tax. The exchange of information is expected to enter in force no earlier than 1 July 2026.

Switzerland has implemented the global minimum tax broadly in line with the OECD framework. Under this system, the IIR imposes a minimum effective tax rate of 15% on the profits of large multinational groups that generate a global turnover of at least EUR750 million. Based on the current Swiss implementation, there are no material deviations from the OECD framework.

Switzerland has not introduced a specific tax on digital services or streaming services, adopting the position that the digital economy should be addressed through a multilateral solution. Switzerland therefore focuses on the OECD/G20 Inclusive Framework process and refrains from unilateral measures, especially if they fall outside the scope of DTAs.

Definitions

Swiss law distinguishes between tax evasion, tax fraud and tax avoidance, and these concepts apply equally in domestic and cross-border situations.

Tax evasion (soustraction fiscale/Steuerhinterziehung)

This covers situations where a taxpayer, intentionally or through negligence, causes a tax assessment not to be carried out when it should have been, or causes an assessment that has become final to be incomplete. Tax evasion is punishable by a fine, generally set between one-third and three times the amount of tax evaded, depending on the circumstances, including the gravity of the fault, the co-operation of the taxpayer, etc.

Tax fraud (fraude fiscale/Steuerbertrug)

This is a specific offence and involves the use of falsified or materially incorrect documents with the intent to deceive the tax authorities. In particular, anyone who uses falsified or untrue documents (eg, balance sheet, profit and loss statement, salary certificate or other attestations) with intent to mislead the tax authorities is potentially liable to a jail sentence of up to three years and/or a fine.

Embezzlement of tax at source

This is another specific tax offence that occurs where a person obliged to levy tax at source on employment income unlawfully retains or diverts the amounts collected for their own benefit or for the benefit of a third party. It constitutes a qualified tax offence and is punishable by a jail sentence of up to three years and/or a fine.

Tax avoidance

Swiss case law and legal scholars also recognise the concept of tax avoidance (évasion fiscale/Steuerumgehung) developed by the SFSC. An arrangement may be treated as abusive tax avoidance if the following three conditions are cumulatively met:

• the legal structure chosen appears unusual, inappropriate or artificial;
• it was adopted with the intention of achieving a tax saving; and
• it results in significant tax savings.

Where these criteria are satisfied, the tax authorities may disregard the chosen form and assess taxation based on an economic recharacterisation of the situation (ie, on the basis of the circumstances that would have existed absent the abusive arrangement).

Switzerland combats tax fraud, tax evasion and abusive tax avoidance in cross-border situations through a combination of:

• treaty-based provisions;
• administrative practice (in particular for treaty relief and withholding tax);
• general and specific domestic anti-abuse rules; and
• case law developed by the SFSC.

Specific DTA Provisions

Swiss DTAs often contain provisions that are intended to prevent abuse, although the content differs depending on the treaty partner. By way of example, the Switzerland–US DTA includes a limitation-on-benefits approach under which treaty benefits (eg, reduced withholding tax) are granted only if the recipient qualifies as a “qualified person” within the meaning of the treaty (eg, Article 22 of the Switzerland–US DTA).

General Anti-Abuse Reservation in Treaty Application

Historically, Switzerland applied the Federal Council decree of 1962 (ACF 62) to limit treaty abuse. Following a partial repeal in 2017, the decree was fully abolished as of 1 January 2022. Separately, the SFSC has recognised that all Swiss DTAs are subject to an implicit reservation against treaty abuse. According to SFSC case law, based on the requirement to apply treaties in good faith (pacta sunt servanda; Article 26 of the Vienna Convention on the Law of Treaties), treaty benefits may be denied in abusive situations even where the treaty does not contain an explicit anti-abuse clause. In this context, and particularly in the context of WHT relief, beneficial ownership plays a key role: treaty relief may be refused if the formal recipient is not the effective beneficiary (eg, where the economic beneficiary should not have benefited from the relevant DTA).

Administrative Practice: Treaty Shopping/Rule Shopping

To counter treaty shopping and rule shopping, Swiss practice applies substance-oriented tests aimed at identifying inappropriate or artificial arrangements in the context of WHT relief. Under this practice, substance may be demonstrated in particular through:

• personal substance (own personnel operating from own premises in the state of residence; personnel may also be employed by a related local entity);
• functional substance (in addition to the Swiss participation, at least one other substantial participation in another state so that the entity can be regarded as acting as an international holding company); and
• balance sheet substance (eg, an equity ratio of at least 30% in the commercial balance sheet).

Whether these elements must be met alternatively or cumulatively depends on the specific circumstances.

Domestic Anti-Abuse Rule

Swiss domestic law sometimes contains specific rules against cross-border abusive structures. This includes, for example, residence concepts such as the place of effective management (see 2.5 Tax Residence of Legal Entities).

With respect to WHT, the Withholding Tax Act includes an explicit anti-abuse rule: a refund is excluded in abusive situations, notably where a Swiss-resident company is interposed to obtain a refund that would not be available to the foreign economic beneficiary. In practice, this provision is applied in various situations defined by the administrative practice, such as “international transposition”, “national converter” and comparable arrangements.

Case Law

In addition, several theories have been developed by the SFSC against tax evasion in cross-border situations. These mechanisms allow the Swiss tax authorities to tax all or part of a company’s profits or an individual’s income, to prevent abusive arrangements and ensure taxation that reflects economic reality. These concepts allow the tax authorities to allocate income or profits differently from the legal form chosen by the taxpayer.

Key examples include the following.

• Transfer pricing adjustments: remuneration in related-party cross-border dealings may be corrected under the arm’s length principle. If a Swiss company pays excessive remuneration to a related foreign entity, said remuneration may be adjusted, leading to an increase of the Swiss taxable profit.
• Mandate theory: where a foreign company effectively acts as an agent for its Swiss parent company, the profit realised at the level of the foreign entity may be attributed to the Swiss parent, by reference to a mandate relationship.
• Tax avoidance/Durchgriff: depending on the circumstances, the authorities may rely on tax evasion concepts (see 5.1 Definition and Identification of Tax Fraud, Evasion, Tax Avoidance and Abusive Schemes) and look-through (Durchgriff) approaches to disregard arrangements that do not reflect the underlying economic substance.

Switzerland does not maintain a list of non-cooperative or high-risk jurisdictions for tax purposes that would automatically trigger specific income tax consequences merely because a counterparty is located in a particular jurisdiction.

However, in practice, transactions involving entities in low-tax or offshore jurisdictions are typically subject to increased scrutiny by Swiss tax authorities, irrespective of whether a jurisdiction is on a formal “non-cooperative” list. In such cases, SFSC case law may require the taxpayer to substantiate the arrangement more extensively and, depending on the circumstances, may effectively shift the burden of proof to the taxpayer.

In Switzerland, the primary reporting obligation is the annual filing of a complete tax return, in which taxpayers must disclose all relevant facts, including domestic and foreign income and assets.

Where the tax authorities have indications that a tax return or a final assessment is incomplete, they may open proceedings to determine back taxes (procédure en rappel d’impôts/Nachsteuerverfahren) and, where appropriate, initiate criminal proceedings in parallel. The back-tax procedure broadly follows the principles of the ordinary assessment procedure: the tax administration sets out the elements indicating an incomplete assessment, grants the taxpayer the right to be heard and, if the matter is not clarified in the taxpayer’s favour, issues an additional tax assessment.

In addition, the WHT (see 3.3 Passive Income) functions as a structural compliance mechanism designed to encourage proper declaration of taxable income and assets.

Finally, international reporting and exchange-of-information mechanisms (see 7.1 Legal Framework for Administrative Co-Operation) can, in practice, trigger follow-up enquiries and tax audits.

In Switzerland, the investigative powers of the authorities depend on the procedural framework. A distinction must be made between the ordinary tax assessment and audit process, the procedure relating to “tax misdemeanours” (in particular tax evasion), and proceedings concerning tax “offences” (in particular tax fraud).

In the ordinary tax assessment procedure, the competent cantonal tax authorities and, for certain federal taxes, the FTA may request all information and supporting documentation necessary to determine a correct assessment.

The authorities are entitled, after the filing of a tax return, to seek additional explanations, accounting records and documentary evidence. In practice, the FTA regularly conducts audits in VAT, WHT and stamp duties, typically covering prior tax periods. Once an audit is initiated, the taxpayer is required to grant access to books, records and supporting documents. The purpose of an audit is to verify compliance and detect under-reporting. Audit triggers vary, but typically include higher-risk profiles, taxpayers not audited for a longer period, and random selection.

In practice, an audit initiated in relation to a specific tax (eg, WHT) that results in back taxes will often prompt the authorities to extend their review and to open further audits covering other taxes.

This distinction between administrative and criminal aspects is important because, in practice, they are often conducted in parallel. In proceedings relating to tax misdemeanours, such as tax evasion or breaches of procedural obligations, the same tax administration is generally competent both for the back-tax procedure and for setting the fine. This overlap may give rise to procedural tensions, because the taxpayer is under a duty to co-operate in the administrative back-tax procedure, whereas the criminal law procedural guarantee, including the privilege against self-incrimination, applies in criminal proceedings.

Where the facts suggest a tax offence, such as tax fraud, the matter moves beyond the ordinary administrative framework. In such cases, the public prosecutor is competent for the criminal prosecution, and the proceedings are governed by the Swiss Code of Criminal Procedure. The public prosecutor may use coercive investigative measures where appropriate.

In specific cases, the FTA may also order coercive measures under the Federal Act on Administrative Criminal Law, based on a written mandate from the head of the Federal Department of Finance, including:

• searches of premises;
• seizure of documents/data;
• sequestration/freezing of assets; and
• questioning of individuals.

Accordingly, Swiss tax authorities have broad powers to obtain records and conduct audits in the ordinary assessment context, but searches, raids and comparable coercive measures are generally reserved for criminal or administrative criminal proceedings and require a specific legal basis and sufficient suspicion of a serious offence.

In Switzerland, no separate penalty regime applies solely because a transaction is cross-border. The general tax penalty framework applies equally to domestic and cross-border situations where taxable facts have been omitted, misreported or otherwise handled incorrectly.

If taxes have not been properly declared or paid, the competent authority may first open a back-tax procedure (see 5.4 Reporting Obligations and Disclosure Regimes) to recover the unpaid tax. Under Swiss law, back taxes may generally be assessed for up to ten years following the relevant tax period or the entry into force of the original assessment, depending on the tax concerned and the applicable procedural rules.

Where the conduct amounts to tax evasion, whether committed intentionally or negligently, the taxpayer is exposed to a fine. As a rule, the fine is assessed by reference to the amount of tax evaded and typically ranges from one-third to three times the evaded tax, depending on the degree of fault. Attempted tax evasion is also punishable, usually at a reduced level.

The competent authority depends on the tax involved. As a rule:

• cantonal tax authorities are competent for cantonal and communal taxes and, in practice, also for the administration and sanctioning of direct federal tax within their sphere of competence; and
• the FTA is competent for federal indirect taxes, in particular VAT, WHT and stamp duties.

The same authority that conducts the back-tax procedure is often also competent for the related tax-evasion procedure, which explains the close connection between the recovery of unpaid taxes and the imposition of administrative penalties.

In Switzerland, tax evasion is generally not treated as an ordinary criminal offence in the strict sense, but rather as a tax misdemeanour of an administrative criminal nature, punishable primarily by a fine (see 6.1 Tax Penalties). By contrast, tax fraud constitutes a criminal offence and may be prosecuted under the applicable tax legislation and, depending on the circumstances, also under the Swiss Criminal Code. The sanctions may include imprisonment of up to three years and/or a fine.

Where the circumstances are especially aggravating, Swiss administrative criminal law provides for enhanced sanctions. A person who, acting professionally or with the assistance of third parties, secures a particularly significant unlawful advantage or causes particularly significant prejudice to the pecuniary interests or other rights of the public authorities through serious tax or customs offences may be punished by a jail sentence of up to five years or a fine.

In addition, certain serious tax offences may have consequences beyond tax criminal law. Under Swiss anti-money laundering rules, a qualified tax offence may constitute a predicate offence to money laundering. This may notably be the case where tax fraud leads to an evaded tax amount exceeding CHF300,000 per tax period.

Accordingly, the key distinction under Swiss law is that ordinary tax evasion is generally sanctioned by fines, whereas tax fraud and other aggravated forms of conduct may lead to jail sentences.

Under Swiss law, tax offences such as tax fraud are not prosecuted by the tax administration itself. Where the competent tax authority considers that the relevant facts indicate a tax offence, the public prosecutor is competent. The public prosecutor then assumes responsibility for the criminal proceedings, which are conducted under the Swiss Code of Criminal Procedure. Once seized, the public prosecutor investigates the facts, may order coercive measures where necessary, and will then decide whether to discontinue the case, issue a penalty order or refer the matter to the competent criminal court for judgment.

Co-ordination is ensured through this allocation of responsibilities. The tax authority remains competent for the administrative side, including the assessment of back taxes and, where applicable, proceedings relating to tax misdemeanours such as tax evasion. By contrast, the judicial authorities take over the criminal side where the conduct qualifies as a tax offence.

In the case of tax misdemeanours, however, the same cantonal or federal tax administration is usually competent both for the back-tax procedure and for the sanctioning procedure. This cumulation of functions may create procedural tension, as the taxpayer is subject to a duty to co-operate in the administrative back-tax procedure, while criminal law procedural guarantees (such as the privilege against self-incrimination) apply in the “criminal” context. For this reason, it is often considered preferable that, where possible, the criminal procedure be conducted first, before the administrative back-tax procedure is finalised. In practice, however, the two procedures are often conducted in parallel.

Accordingly, the Swiss system does provide for a referral mechanism where tax authorities identify facts suggesting tax fraud or another tax offence. Co-ordination is achieved through the division between tax authorities, which initiate the complaint and handle the tax assessment aspects, and the public prosecutor and criminal courts, which conduct and determine the criminal proceedings.

In Switzerland, administrative co-operation in tax matters is largely treaty-based and relies on a mix of bilateral and multilateral instruments, supplemented by domestic implementing laws.

Key legal bases include the following.

• DTAs generally include an exchange-of-information on request clause, as well as dispute resolution mechanisms.
• Tax information exchange agreements (TIEAs/AERF) and the OECD/Council of Europe Convention on Mutual Administrative Assistance in Tax Matters also support exchange on request.
• The same multilateral Convention also provides the framework for spontaneous exchange of information (Article 7), which has been applicable in Switzerland for spontaneous exchange purposes for tax periods starting from 1 January 2018 (with the Convention in force for Switzerland since 1 January 2017).
• Automatic exchange of information (AEOI/CRS) on financial accounts is implemented mainly via the Multilateral Competent Authority Agreement (MCAA). With the EU, AEOI is implemented via a bilateral agreement (ie, not through EU directives). The Swiss legal bases have been in force since 1 January 2017.
• Country-by-country reporting (CbCR) exchange is implemented through the multilateral competent authority agreement and the corresponding Swiss implementing law and ordinance (in force since 1 December 2017).

Switzerland exchanges tax information in automatic, spontaneous and on-request formats, based on the applicable treaty or multilateral framework and the corresponding Swiss implementing rules (See 7.1 Legal Framework for Administrative Co-Operation).

Automatic Exchange (AEOI/CRS and Similar Frameworks)

Switzerland applies the global standard for the automatic exchange of information on financial accounts (AEOI/CRS), primarily via the MCAA; with the EU, AEOI is implemented through a bilateral agreement. The Swiss legal bases for AEOI (including the Convention, the MCAA and the Swiss implementing law) have been in force since 1 January 2017, and the system provides for regular exchanges with partner jurisdictions that have an activated exchange relationship.

Exchange on Request

Switzerland grants administrative assistance on request under exchange-of-information clauses in DTAs/TIEAs and under the Multilateral Convention on Mutual Administrative Assistance in Tax Matters, implemented domestically through the Swiss framework for international administrative assistance. Swiss practice is built around the standard that information is provided in response to a duly substantiated request (ie, no “fishing expeditions”).

Spontaneous Exchange

Switzerland also exchanges information spontaneously in defined situations, notably in relation to certain tax rulings/advance rulings. Switzerland has been exchanging information on relevant tax rulings since 2018, and performs such exchanges with partner jurisdictions in practice.

Overall, these mechanisms allow Swiss authorities to obtain information from partner jurisdictions and, conversely, to transmit information where the applicable framework provides for it, thereby strengthening transparency and enforcement in cross-border situations.

This is not applicable in Switzerland.

Where double taxation has occurred, or there is a risk that taxation not in accordance with an applicable DTA will occur, a taxpayer resident in Switzerland may request the initiation of a mutual agreement procedure (MAP). The legal basis is found primarily in the MAP provision of the applicable DTA, typically corresponding to Article 25 of the OECD MTC. In addition, the procedure is governed under Swiss domestic law by Articles 2 et seq of the Federal Act on the Implementation of International Tax Agreements (ITAIA), which entered into force on 1 January 2022.

In Switzerland, MAP requests must generally be submitted to the Federal Department of Finance, acting through the State Secretariat for International Finance (SIF). The MAP may concern either the elimination of double taxation that has already arisen or the prevention of imminent double taxation. In the transfer pricing area, the MAP framework also serves as the basis for bilateral or multilateral advance pricing arrangements.

It should be noted that the MAP is a procedure between the competent authorities of the states concerned; the taxpayer is not formally a party to that inter-state procedure, although it is initiated at the taxpayer’s request and the co-operation of the taxpayer plays an important role in practice.

Generally, a MAP request must be submitted within three years from the first notification of the action giving rise to double taxation. This reflects the approach of Article 25 of the OECD MTC and is also the position adopted in many Swiss tax treaties and in Swiss domestic legislation (ie, ITAIA).

However, the applicable deadline must always be verified under the relevant treaty. While most Swiss DTAs contain the three-year period, some treaties either provide for a different deadline or do not specify any express time limit.

In practice, taxpayers are expected to file the request as early as possible.

Arbitration is available only where the relevant DTA expressly provides for it. Several Swiss DTAs contain an arbitration clause, under which unresolved issues in a MAP may, after expiry of the treaty-based waiting period, be submitted to arbitration at the taxpayer’s request.

Arbitration is therefore not generally available across Switzerland’s treaty network, but only on a treaty-by-treaty basis. In addition, most treaties providing for arbitration exclude it where a court has already rendered a decision on the matter. Where arbitration is available and results in a decision, that decision must be implemented through mutual agreement by the competent authorities.

Switzerland does not have a separate standalone advance pricing agreement (APA) programme. In practice, however, APAs are available and are generally treated as a specific form of MAP-based dispute prevention in transfer pricing matters.

This reflects the broader Swiss approach to transfer pricing. Swiss tax law does not contain a comprehensive codified transfer pricing regime; instead, the arm’s length principle is applied under general tax law principles, and Swiss tax authorities and courts commonly rely on the OECD Transfer Pricing Guidelines as the principal interpretative standard.

In procedural terms, APAs may be unilateral, bilateral or multilateral, depending on the circumstances. Bilateral and multilateral APAs are handled within the MAP framework through the competent authorities. MAPs in the transfer pricing area may be used to determine transfer prices in advance and may, where the facts and circumstances are unchanged, also extend to prior tax periods by way of rollback.

In practice, the duration of an APA is determined on a case-by-case basis. It typically covers three to five years, depending on the nature of the transactions and the expected stability of the underlying facts. Unilateral APAs or transfer pricing rulings with cross-border implications may also trigger spontaneous exchange of information.

Unilateral Tax Ruling

In practice, the main instrument for obtaining tax certainty in Switzerland is the unilateral tax ruling.

A tax ruling is a binding confirmation, issued at the taxpayer’s request, that the competent Swiss tax authority will accept the Swiss tax treatment of a proposed structure, transaction or set of facts as presented. In international tax matters, rulings are widely used to obtain certainty before the implementation of a structure or before a transaction, and materially reduce the risk of subsequent disputes.

More generally, Swiss practice is characterised by a co-operative relationship between taxpayers, advisers and the tax authorities. In many cases, the authorities are willing to discuss a contemplated structure or transaction in advance, which can help resolve questions at an early stage and avoid later controversy.

In addition, the tax authorities issue administrative guidance and, in certain areas, safe harbour provisions, which taxpayers may rely upon when structuring and documenting cross-border arrangements.

That said, Switzerland does not have a formal co-operative compliance programme comparable to those established in some other jurisdictions.