The main sources of international tax law in Portugal include international treaties (notably double tax treaties, or DTTs), European Union (EU) law and domestic law designed to align with global standards. These sources apply concurrently in both domestic and cross-border contexts and are primarily aimed at eliminating double taxation, preventing tax evasion and regulating cross-border transactions.

Portuguese case law, in particular that of the administrative and tax courts, has some pertinence, with the courts frequently addressing issues of treaty interpretation and the interaction between domestic provisions, EU law and anti-abuse standards. The approach of the courts tends to be consistent with developments in international and EU case law, which acts as the main authority responsible for interpretation in line with global standards and practices.

Administrative guidance and binding rulings issued by the Portuguese Tax Authority (PTA) play a pivotal role in promoting consistency in tax administration. Binding rulings are commonly sought in domestic and cross-border reorganisations, financing structures and investment transactions to secure legal certainty, as they set out the PTA’s interpretation by reference to a defined factual framework. Notwithstanding the above, the PTA has shown a degree of reluctance in adopting interpretations derived from international standards and case law. 

Portugal maintains an extensive DTT network (approximately 79 treaties concluded, of which 78 are currently in force) which follows the OECD model. These treaties allocate taxing rights between contracting states in respect of the main categories of income, including income from immovable property, business profits, dividends, interest, royalties, capital gains, employment income and pensions. Issues relating to treaty access, entitlement to benefits and treaty interpretation frequently arise in inbound and outbound structuring, as well as in tax disputes, rendering DDTs one of the main sources of international tax law in Portugal. 

International treaties duly ratified and published form part of the Portuguese legal system and, as a rule, prevail over conflicting domestic provisions. This principle applies to tax treaties (including DTTs) and other international tax instruments.

DTTs do not create standalone taxing powers; rather, they allocate taxing rights between contracting states, thereby restricting the exercise of domestic taxing jurisdiction. This is particularly relevant in areas such as withholding taxes, permanent establishment (PE) assessment, and the allocation of taxing rights in respect of cross-border income.

As an EU member state, Portugal is also bound by EU law, including the fundamental freedoms and applicable Regulations and Directives. Domestic tax law must comply with EU law, with the case law of the Court of Justice of the European Union (CJEU) having a material impact on the interpretation and application of Portuguese tax provisions in cross-border situations.

Domestic law remains the primary operational basis for taxation. However, in cross-border matters, its interpretation and application are subject to, and constrained by, the applicable treaty provisions and EU law principles and provisions.

Portugal was one of the 20 founding member countries that signed the OECD Model in 1960 and its DTTs largely follow the OECD Model both in structure and allocation of taxing rights.

While core concepts such as residence, PE and business profits generally reflect OECD standards, some DTTs include provisions of the UN Model, reflecting the bilateral and negotiated nature of such instruments.

Portugal has departed from certain provisions of the OECD Model, notably in relation to Article 5 (PE), and in several bilateral DTTs has adopted elements more closely aligned with the UN Model Convention. 

Moreover, in a number of DTTs Portugal has reserved the right to consider that a PE exists where a business activity of a non-resident company is carried on in Portugal with a certain degree of continuity through employees or other personal engaged under contract.

As a result, Portuguese DTTs are not standardised. A case-by-case analysis is required rather than assuming a wholly standardised OECD-based approach.

Portugal signed the Multilateral Instrument (MLI) in 2017, ratified it in 2020, and it has been in force since June 2020.

As at the most recent date available (early 2026), the amendments introduced by the MLI are effective, in the case of Portugal, in approximately 60 bilateral DTTs, corresponding to around 60 countries or jurisdictions.

Portugal applies a residence-based system of taxation, whereby resident individuals and entities are subject to taxation on their worldwide income, whilst non-residents are taxed solely on income sourced in Portugal.

The Autonomous Regions of Madeira and the Azores adhere to the same principle, although reduced rates apply in respect of certain taxes.

An individual is deemed a tax resident in Portugal upon staying more than 183 days in Portugal in any relevant 12-month period or maintaining a house under conditions indicating the intention to hold and occupy it is as habitual residence.

Residence disputes most commonly arise in the context of international mobility and cross-border employment arrangements. Where dual residence occurs, DTTs tiebreaker rules determine the final allocation of residence for tax purposes. 

Resident individuals are taxed on their worldwide income. Employment and business income is generally subject to progressive Personal Income Tax (PIT) rates, currently reaching a top marginal rate of 48%, with an additional solidarity surcharge of up to 5% applying to higher income brackets.

Certain categories of income, such as dividends, interest, royalties, other capital income and capital gains, are generally subject to flat rates (typically 28%), unless the taxpayer opts for aggregation and progressive taxation.

Special deductions and reliefs are available, operating both at income determination level (income category assessment) and as taxable income direct deductions, being relief from double taxation available through DTT mechanisms or domestic foreign tax credit provisions.

Special tax regimes applicable to Non-Habitual Residents (NHR) are available, resulting in 20% flat rates for domestic income, and a full exemption for foreign-sourced income.

Accordingly, the effective taxation therefore depends on the residence status, the type of income, the applicable exemptions and reliefs and on the interaction with cross-border relief provisions.

Non-resident individuals’ liability to tax is limited to income source in Portugal.

Employment and business income relating to work performed in Portugal is generally taxed at a flat rate of 25%.

Dividends sourced in Portugal, interest, royalties and other capital income are typically subject to withholding tax at a domestic rate of 28%, subject to any reduction available under an applicable DTT or pursuant to EU law.

Capital gains derived by non-residents from Portugal-sourced assets, including immovable property or certain shareholdings, are also subject to tax. As a general rule, only 50% of immovable property gains are taxed (at the applicable progressive PIT rates, currently reaching a top marginal rate of 48%), while gains on shares may be exempt unless the assets derive more than 50% of their value from Portuguese immovable property. 

Domestic provisions applicable to non-residents are frequently overridden by the applicable DTT, which may reduce domestic withholding tax rates and, in some cases, provide full relief. Access to DTTs’ benefits depends on proper and timely submission of the requisite documentation.

A company is deemed to be tax resident in Portugal when its legal seat or place of effective management is located there.

Residence disputes may arise within international group structures, particularly where management functions are exercised across multiple jurisdictions or where there is a divergence between the legal seat and the place of effective management. DTTs’ tiebreaker rules may become relevant in dual-residence scenarios, allowing for residence allocation for tax purposes.

Domestic law defines a permanent establishment or PE as a fixed place of business through which a commercial, industrial or agricultural activity is wholly or partly carried out. The definition includes the usual examples such as a place of management, branch, office, factory, workshop or place of extraction of natural resources.

In addition to the standard “fixed place” concept, Portuguese domestic law expressly includes:

• construction, installation or assembly sites existing for more than six months (including related supervisory activities);
• platforms, vessels or installations used in the exploration of natural resources where activities exceed 90 days; and
• the provision of services (including consultancy services) performed in Portugal for more than 183 days within any relevant 12-month period.

The service PE provision and the six-month threshold applicable to construction projects depart from the traditional wording of the OECD Model, which generally adopts a 12-month threshold and does not contain a standalone service PE provision. As a result, domestic law may create PE exposure in situations where no PE would arise under the OECD standard.

Agency PE provisions have also been aligned with post-base erosion and profit shifting (BEPS) developments. A PE may arise where a person habitually plays the principal role leading to the conclusion of contracts that are routinely finalised without material modification by the enterprise. Independent agents acting in the ordinary course of business remain excluded.

Activities of a preparatory or auxiliary character are excluded from PE status. However, anti-fragmentation principles apply where closely related enterprises carry on complementary activities in Portugal.

If a conflict occurs, the definition contained in the applicable DTT prevails to the extent that it is more restrictive than the domestic definition.

Following the update to the Commentary on Article 5 of the OECD Model, clear guidance was provided as to when cross-border remote working arrangements may give rise to a PE. The update introduces additional guidance, including a two-step analytical system involving a temporal threshold and an assessment of whether the employee’s presence in the other jurisdiction is driven by a relevant business purpose.

Under this approach, a PE is more likely to arise where a home office is used for substantive business purposes of the enterprise. By contrast, remote working arrangements implemented primarily for employee retention or cost-efficiency reasons are not, in themselves, regarded as sufficient to satisfy the business-purpose criterion. This clarification is broadly consistent with the approach traditionally adopted in Portugal, which focuses on the availability of the location to the enterprise and the carrying on of business activities through it.

Individuals

Income from Portuguese immovable property (rental income) is taxed at a flat rate of 28%, or 25% in case of residential leases (reduced rates may apply to long-term residential lease agreements, depending on the duration of the contract).

Whereas maintenance and repair costs, condominium fees, insurance, Municipal Property Tax and Stamp Duty are tax deductible, capital improvements and mortgage interest are, generally, non-deductible.

Portuguese and EU/EEE residents may opt to aggregate rental income, in which case income will be subject to general progressive PIT rates, currently ranging from 12.5% to 48%.

Legal Entities

Rental income derived by legal entities is subject to Corporate Income Tax (CIT).

For Portuguese-resident legal entities, rental income forms part of the company’s taxable profits and is taxed at the standard CIT rate of 19% (to which may be added a 1.5% Municipal Surtax and a State Surtax of up to 9%).

Taxable income is determined on a net basis, meaning that expenses directly related to the property (eg, depreciation, maintenance, Municipal Property Tax, insurance, financing costs) are usually deductible under the general rules.

Non-resident legal entities without a permanent establishment in Portugal are taxed solely on Portugal-sourced rental income, generally at a flat rate of 25%, with the deductions aligned with those applicable to individuals.

Tax-resident legal entities are taxed on their worldwide income, while non-resident legal entities are taxed solely on Portugal-sourced income.

Residents

As a general rule, the tax period corresponds to the calendar year, although taxpayers may elect to adopt a different tax period. The standard CIT rate is 19% (set at 18% for 2027 and at 17% from 2028 onwards). Entities that carry out, directly and primarily, an activity with an economic, agricultural, commercial, or industrial nature, and qualify as small or medium-sized or small- or mid-cap companies (SME), benefit from a CIT rate of 15% on the first EUR50,000 of taxable profit, with the 19% standard rate applying to the surplus.

A Municipal Surtax of up to 1.5% (depending on the municipality in which the business is carried out and as determined by the relevant municipality on an annual basis) also tends to apply. A State Surtax may also apply, as follows.

• Profits exceeding EUR1.5 million: 3%.
• Profits exceeding EUR7.5 million: 5%.
• Profits exceeding EUR35 million: 9%.

Certain expenses are subject to aggravated taxation through autonomous tax charges, with rates ranging from 5% to 35%, depending on their nature. These rates are increased by ten percentage points where the taxpayer reports a tax loss in the relevant period, except during the first and second years of activity.

Taxable profit matches the net accounting profit (determined under Portuguese generally accepted accounting principles), as adjusted by the CIT provisions.

As a general principal, all expenses are deductible to the extent that they are necessary for the purpose of generating taxable income and are properly documented. Some listed exclusions apply; these include the CIT itself and any other taxes directly or indirectly levied on income; undocumented or unproperly documented expenses; penalties and charges; and expenses related to vehicles exceeding specific limits.

Tax deductibility of net financial costs should be secured within existing interest barrier provisions, which cap the deduction at the highest of: (i) EUR1 million; or (ii) 30% EBITDA.Non-deductible net financial costs, as well any unused portion of the 30% threshold, may be carried forward for five periods.

Tax losses may be carried forward indefinitely, but for up to only 65% of taxable profit in the relevant tax period. Any unused portion remains available, however. The carry-forward of tax losses does not impact Municipal and State Surtaxes.

Non-Residents

Non-residents operating in Portugal through a Portuguese PE will be subject to Portuguese CIT on the profits attributable to that permanent establishment.

Such profits are determined in accordance with the arm’s length principle and the applicable domestic CIT provisions (as detailed above), as if the PE were a separate and independent entity conducting the same or similar activities under comparable conditions.

Portuguese-sourced business profits obtained by non-resident legal entities not attributable to a Portuguese PE are subject to CIT at a rate of 25%. However, under the applicable DTT, Portugal’s taxing rights may be eliminated.

Dividends

Dividends paid to resident individuals are subject to tax at a flat rate of 28%, unless the beneficiary opts for aggregation. In this case, only 50% of the dividends are included and taxed at the progressive PIT rates.

Where the distributing entity is resident in Portugal, the payment is subject to withholding tax. Dividends received from non-resident legal entities may benefit from a foreign tax credit in respect of tax paid in the source state.

Dividends paid to non-resident individuals are, as a rule, subject to withholding tax at a rate of 28%. This rate may be reduced under the applicable DTT, provided that Form 21-RFI and a valid tax residence certificate are submitted.

Dividends paid to resident legal entities are subject to withholding tax at a rate of 25%, which operates as a payment on account of the final CIT liability where the shares have not been held for an uninterrupted period of at least one year and do not represent at least 10% of the share capital or voting rights of the distributing entity. Dividends are taxed at the standard CIT rate of 19% (with a 15% rate applying to the first EUR50,000 for SMEs), unless the participation exemption regime applies. In this case, dividends are exempt from CIT, provided that, inter alia, a minimum 10% shareholding is held for at least one year (or the shareholder undertakes to hold it for such period).

As a general rule, dividends paid to non-resident legal entities are subject to withholding tax at a domestic rate of 25%. A CIT exemption may apply to dividends distributed by a Portuguese company subject to, and not exempt from, Portuguese CIT, provided that a qualified participation is held (10% of the share capital or voting rights for an uninterrupted period of at least one year) and the qualified parent company requirement is met. The exemption is conditional upon compliance with EU anti-abuse provisions and beneficial ownership requirements, as well as the submission of the relevant supporting documentation by the shareholder.

Where the exemption does not apply, the 25% withholding tax rate may be reduced under an applicable DTT, subject to the submission of Form 21-RFI and a valid tax residence certificate.

Interest & Royalties

Under domestic law, interest paid to resident individuals is generally subject to withholding tax at a final rate of 28%, unless the taxpayer opts for aggregation, in which case the income is taxed at the applicable progressive PIT rates. Royalties are taxed under the general Personal Income Tax (PIT) provisions at progressive rates and may be subject to withholding tax on account of the final liability.

As a general rule, interest and royalties paid to resident legal entities are subject to withholding tax at 25%, operating as a payment on account of the final CIT liability, unless the special tax consolidation regime applies (in which case no withholding tax applies).

Interest and royalties paid to non-residents are, as a rule, subject to withholding tax at a domestic rate of 25% (legal entities) or 28% (individuals).

These rates may be reduced under an applicable DTT or, in the case of qualifying associated EU companies, reduced to 0% under the Interest & Royalties Directive, provided that the relevant conditions are met.

The application of a reduced rate or exemption is conditional upon the non-resident recipient providing the Portuguese payer with the required documentation (including Form 21-RFI, where applicable) and satisfying the beneficial ownership and anti-abuse requirements.

In Portugal, capital gains correspond to the gains arising from the disposal for consideration of certain assets or rights and are essentially divided into two main categories: immovable property capital gains and securities (or movable) capital gains.

The former generally result from the disposal of immovable property, while the latter arise from the transfer of shareholdings, securities or other financial instruments.

Immovable Property

Immovable property capital gains realised by (resident and non-resident) individuals or non-resident legal entities are calculated as the difference between: (i) sale value; and (ii) acquisition value, increased by: (a) expenses related to improvements carried out during the 12 years preceding the disposal; and (b) costs inherent to the acquisition and sale of the property. The acquisition value may be adjusted by the applicable inflation (currency devaluation) coefficients, provided that at least 24 months have elapsed since the acquisition date.

For individuals, 50% of the resulting gains is included in taxable income and subject to the progressive PIT rates, ranging from 13% to 48%, with an additional solidarity surcharge of 2.5% or 5% applying where taxable income exceeds EUR80,000. A full exemption may apply under the rollover regime, subject to the fulfilment of the relevant statutory requirements.

For non-resident legal entities without a PE in Portugal, immovable property capital gains are generally subject to CIT at a flat rate of 25%, unless reduced under an applicable DTT.

Capital gains realised by resident legal entities from the disposal of immovable property are calculated as the difference between: (i) sale value; and (ii) acquisition value, the latter being reduced by tax-deductible depreciation, impairment losses and other value adjustments, and updated by the applicable inflation (currency devaluation) coefficients where at least two years have elapsed since the acquisition date. 

Immovable property capital gains are subject to CIT. A 50% rollover relief may apply where the proceeds are reinvested in eligible tangible fixed assets, provided that the disposed property is not, and was not required to be, recognised as investment property. Please refer to 3.2 Business Profits for the applicable CIT rates.

Securities

Capital gains arising from the disposal of shares are calculated as the difference between: (i) sale value; and (ii) acquisition value, the latter being adjusted by the applicable inflation (currency devaluation) coefficients where at least 24 months have elapsed since the acquisition date.

In case of individuals, such gains are, as a rule, subject to taxation at a flat rate of28%. An effective rate of 14% may apply where the shares relate to a micro or small company, provided that the statutory requirements are met.

However, capital gains must be mandatorily aggregated with the taxpayer’s remaining income and taxed at progressive PIT rates where they derive from assets held for less than 365 days and the taxpayer’s taxable income, including the capital gain, equals or exceeds EUR86,634.

Non-resident individuals may, in principle, benefit from an exemption from Portuguese tax on capital gains arising from the disposal of shares. However, this exemption does not apply where: (i) the individual is resident in a jurisdiction included in the Portuguese list of clearly more favourable tax regimes; or (ii) the shares disposed of relate to a company resident in Portugal whose assets consist, directly or indirectly, of more than 50% immovable property located in Portugal, including cases where the company holds a controlling interest in other Portuguese resident entities meeting that threshold. A similar effect (exemption) may also result from the application of an applicable DTT, where the treaty allocates exclusive taxing rights to the state of residence of the transferor.

Capital gains realised by resident legal entities are included in the entity taxable profits and subject to CIT at the applicable rates (please refer to 3.2 Business Profits).

However, such gains may be exempt under the participation exemption regime, provided that: (i) the company whose shares are disposed of is not resident in a blacklisted jurisdiction and is subject to and not exempt from corporate tax; (ii) the company is not, nor should it be treated as, fiscally transparent; (iii) the shareholder holds, directly or indirectly, at least 10% of the share capital; and (iv) such participation has been held uninterruptedly for a minimum period of one year.

The exemption does not apply where more than 50% of the assets of the company whose shares are being disposed of consist, directly or indirectly, of immovable property located in Portugal, except where such immovable property is allocated to an agricultural, industrial or commercial activity other than the purchase and sale of immovable property.

Capital gains realised by non-resident legal entities without a PE in Portugal are, in principle, exempt from CIT under the Portuguese domestic exemption.

This exemption does not apply where:

• the non-resident legal entity is directly or indirectly held, by more than 25%, by Portuguese resident legal entities, unless it is resident in another EU/EEA member state bound by administrative cooperation in tax matters;
• the transferor is resident in a jurisdiction included in the Portuguese list of clearly more favourable tax regimes;
• more than 50% of the assets of the company whose shares are being disposed of consist, directly or indirectly, of immovable property located in Portugal;
• at any time during the 365 days preceding the transfer, the value of the shares or rights in a (non-resident) legal entity derived, directly or indirectly, more than 50% of their value from immovable property located in Portugal, except where such property is allocated to an agricultural, industrial or commercial activity other than the purchase and sale of immovable property.

A similar effect (exemption) may also result from the applicable DTT, where the treaty allocates exclusive taxing rights to the state of residence of the transferor.

Where neither the domestic exemption nor the DTT provides for relief, capital gains are subject to CIT at a rate of 25%.

As a rule, any remuneration paid or made available to an employee in connection with an employment relationship (including salary, bonuses and benefits in kind) qualifies as employment income and is subject to Portuguese PIT.

For Portuguese tax residents, employment income is taxed at the general progressive rates, currently ranging from 12.5% to 48%. A solidarity surcharge further applies at a rate of 2.5% on the portion of taxable income exceeding EUR80,000, and 5% on the portion exceeding EUR250,000.

Specific regimes may apply in certain cases, notably under the former and the new NHR regime or the regime applicable to former tax residents returning to Portugal.

Non-residents are generally subject to withholding tax at a flat rate of 25% on Portuguese-sourced employment income.

Portuguese domestic law does not establish a specific regime governing short-term assignments or cross-border employment. Tax treatment depends on: (i) the individual’s tax residence status; (ii) the applicable source-of-income provisions (namely, where the employment is effectively exercised); and (iii) the application and provisions of any applicable DTT.

Likewise, there are no specific income tax provisions addressing remote working arrangements as such. Accordingly, one must resort to general residence and source principles and provisions. From a corporate tax perspective, remote working arrangements may give rise to PE concerns where an employee performs activities in Portugal on behalf of a foreign employer, requiring a case-by-case assessment.

Portugal taxes crypto‑asset income earned by individuals based on its nature: as business/professional crypto activities (including mining/validation), as investment‑type returns from crypto operations (generally taxed at 28%, with an option to aggregate), and as capital gains. Where crypto‑assets do not qualify as securities, capital gains are generally taxed at 28% if held for less than 365 days, while gains (and losses) on assets held for 365 days or more are excluded from taxation, subject to the EU/EEA or treaty/exchange‑of‑information condition. Crypto‑to‑crypto exchanges are, in principle, tax‑deferred until conversion into fiat currency or other non‑crypto consideration.

For legal entities (and individuals subject to organised accounting), crypto results are included in taxable profits under the general CIT‑based rules.

As of 2026, Portugal has not enacted specific provisions implementing the OECD’s simplified and streamlined approach for baseline marketing and distribution activities (Amount B).

As such, the existing transfer pricing framework continues to be mainly governed by domestic provisions that largely align with the OECD Transfer Pricing Guidelines and expressly state that the Guidelines should be taken into account in the application of the arm’s length principle. Accordingly, there are no material deviations from the (old) OECD framework in this respect.

In addition, according to Portugal’s most recent OECD Transfer Pricing Country Profile, the adoption of the simplified approach remains under consideration. Portugal therefore appears to be monitoring international developments and awaiting further alignment and practical experience in other jurisdictions before acting.

Portugal is a member of the OECD/G20 Inclusive Framework on BEPS and has taken part in the discussions relating to Pillar One.

That said, Portugal has not issued a separate or detailed public statement setting out a specific position on Amount A. Portugal’s involvement has therefore been shown primarily through its participation in the multilateral negotiations, rather than through distinct domestic policy communications.

As a member state of the EU, Portugal’s approach is generally consistent with the common position developed at EU level. At said level, the European Commission has indicated that the implementation of Amount A within the EU is expected to proceed following the entry into force of the OECD Multilateral Convention, the final text of which remains under negotiation.

Portugal has implemented the global minimum tax under Pillar Two into domestic law.

As expected, the Portuguese domestic law establishes a 15% minimum effective taxation standard applicable to large multinational enterprise (MNE) groups and large-scale domestic groups with consolidated annual revenues of at least EUR750 million in at least two of the four preceding tax periods, consistent with the applicable Directive and the OECD threshold.

The Income Inclusion Rule (IIR) and the Qualified Domestic Minimum Top-Up Tax (QDMTT) apply to tax periods beginning on or after 1 January 2024. The Undertaxed Profits Rule (UTPR) applies to tax periods beginning on or after 1 January 2025.

As a result, the main operative components of Pillar Two have been effective in Portugal since the 2024.

Overall, Portugal’s implementation closely follows the structure, definitions, and timelines set at EU and OECD levels, ensuring consistency with the broader international rollout of the global minimum tax while incorporating the rules directly into Portuguese domestic law.

The Portuguese legislation expressly states that guidance issued within the OECD/G20 Inclusive Framework on Pillar Two must be considered when interpreting and applying the domestic minimum tax provisions. This includes the official Commentary to the Model Rules as well as any subsequent Administrative Guidance endorsed by the Inclusive Framework.

Accordingly, the domestic regime is intended to be interpreted consistently with the evolving international framework, thereby promoting alignment with the technical clarifications and interpretative positions developed at OECD level.

Portugal does not impose a broad, standalone digital services tax.

Instead, the Portuguese system relies on sector-specific charges targeting certain digital and audiovisual business models. One notable example arises under the audiovisual and cinema regime, which provides for a 4% levy on certain audiovisual commercial communications, including those disseminated through video-sharing platform services and on-demand audiovisual services (commonly referred to as Advertising Tax). 

Under the same legislative framework, subscription-based video-on-demand providers may also be subject to an annual charge of 1% over relevant income (usually referred as Netflix Tax).

Portuguese law defines tax fraud as intentional conduct aimed at preventing the correct assessment or payment of tax, avoiding the payment of tax due or obtaining undue tax advantages, refunds or financial benefits resulting in a loss of public revenue. Criminal liability generally requires that the unlawful advantage involved be at least EUR15,000.

Tax fraud becomes aggravated where specific qualifying circumstances are present, such as the use of complex concealment mechanisms, falsified documentation or structures involving entities established in clearly more favourable tax jurisdictions.

Although distinct concepts, tax evasion and tax avoidance are not defined in a single statutory provision.

Tax evasion generally refers to unlawful conduct aimed at reducing or eliminating a tax liability, such as the concealment of income, omission of taxable transactions or falsification of information. It may give rise to administrative penalties or criminal liability under the General Regime for Tax Infringements (RGIT), notably in cases of tax fraud or abuse of trust.

By contrast, tax avoidance concerns the use of lawful arrangements to reduce or defer tax liabilities within the limits of the law, meaning that lawful tax planning is permitted provided the arrangements in question reflect economic substance or a valid business purpose. However, arrangements deemed artificial or non-genuine and primarily designed to obtain undue tax advantages may be challenged under the Portuguese General Anti-Abuse Rule (GAAR).

In cross-border situations, substance and functional analysis are central to the assessment of potentially abusive structures. Particular attention must be given to treaty-based anti-abuse provisions introduced through the Multilateral Instrument (MLI), including the Principal Purpose Test (PPT), which applies to most of Portugal’s DTTs. In practice, the analytical approach under the PPT is broadly aligned with the principles underpinning the domestic GAAR, focusing on the purpose and economic substance of the arrangements at stake.

Portugal relies on a combination of general and specific anti-avoidance provisions, many of which were introduced by EU Law or international treaties, including (among others):

• the Domestic GAAR;
• the interest barrier provision;
• Controlled Foreign Companies provisions;
• exit taxation provisions;
• anti-hybrid mismatch provisions; and
• transfer pricing provisions and documentation obligations.

These substantive provisions are rounded out by extensive audit and monitoring powers vested in the PTA. Through audits, targeted inspections and risk-based analysis (including cross-border exchange of information), the PTA actively identifies and challenges aggressive tax structures.

While some regimes are relatively recent – eg, the anti-hybrid mismatch provisions, introduced following the transposition of Anti-Tax Avoidance Directive ATAD II in 2020 – their practical application requires a detailed understanding of the tax treatment of the relevant arrangements in other jurisdictions. In practice, the operation of these provisions depends significantly on the availability of cross-border information and the accurate identification of mismatches between legal systems. As such, the extent to which the PTA will actively invoke and enforce these provisions remains to be seen. 

Treaty-based anti-abuse provisions, namely those included in the MLI – which introduced additional anti avoidance provisions and the PPT – also apply in every DTT concluded by Portugal.

Portugal maintains a list of jurisdictions considered to have clearly more favourable tax regimes (blacklisted jurisdictions). It should be noted that the country’s domestic blacklist currently includes approximately 75 jurisdictions (following the recent removal of Hong Kong, Liechtenstein and Uruguay), whereas the EU’s list of non-cooperative jurisdictions comprises only about ten jurisdictions, reflecting different legal bases, assessment criteria and policy objectives.

Transactions involving listed jurisdictions may trigger higher withholding rates, limitations on cost deduction and exemptions, and enhanced reporting requirements. These defensive measures are particularly relevant in immovable property investment, cross-border financing and service arrangements.

Portuguese relevant reporting mechanisms include mandatory disclosure provisions on certain operations (Directive on Administrative Cooperation (DAC) 6), Common Reporting Standard (CRS)-based financial reporting, beneficial ownership registration (RCBE), and country-by-country (CbCR) reporting.

Taken together, these instruments significantly enhance transparency in cross-border structures and provide the PTA with the necessary tools to pursue investigations, typically through targeted tax audits and exchange of information procedures.

Notwithstanding the above, although Portugal has enacted regulatory and reporting provisions and has publicised the existence and number of reported arrangements, there is no continuously updated, publicly accessible official list of specific scheme names in the form of a blacklist of abusive schemes; rather, the regime relies on the hallmarks and existing instruments and powers vested in the PTA.

The PTA is vested with broad audit and investigative powers within the context of tax audits enabling it to access accounting records, tax documentation and supporting commercial documents, review electronic accounting systems and digital archives, request clarifications from taxpayers and third parties, conduct on-site inspections at business premises, and perform physical inventory checks, where appropriate.

Access to banking information is permitted under specific statutory conditions, including cases involving serious tax offences or where there are indications of concealed income. Depending on the circumstances, judicial authorisation may be required.

Generally, tax audits should be initiated within the statute of limitations (generally four years). Where criminal conduct is suspected (whether or not in the course of tax audits), the PTA is required to report the matter to the Public Prosecutor’s Office (please see 6.1 Tax Penalties). Criminal investigations are then conducted under judicial supervision, and coercive measures – including searches and seizures – may be ordered by a judge.

Cross-border cases increasingly involve exchange of information under DTTs, EU directives and multilateral instruments. International cooperation between tax authorities has become a central enforcement tool, particularly in cases involving offshore structures or aggressive tax planning.

Portugal does not provide for a separate penalties regime for cross-border transactions. Instead, international arrangements fall within the scope of the general tax enforcement regime whenever they result in non-compliance with domestic tax obligations. This may involve underpayment of tax, failure to withhold tax, or breaches of reporting and documentation requirements linked to cross-border activities.

Penalties are primarily governed by the RGIT. The RGITdistinguishes between administrative offences, which are generally punishable by fines, and tax crimes, which in more serious cases may give rise to criminal fines or imprisonment. 

The PTA is responsible for detecting infringements, conducting audits and initiating administrative offence proceedings. It issues assessments and determines applicable fines under the RGIT. Where the circumstances suggest the commission of a tax crime, the matter is referred to the Public Prosecutor’s Office. Criminal investigations are then conducted under judicial supervision, and the competent criminal courts determine liability and impose any sanctions.

In cross-border cases, international cooperation mechanisms may be used to obtain evidence, exchange information or coordinate investigative actions with foreign authorities.

Under Portuguese law, tax crimes may be punishable by imprisonment or by criminal fine. Criminal fines are calculated on the basis of “day-fine” system, where the court determines a number of day units and assigns a monetary amount to each day. For individuals, the daily amount ranges from EUR1 to EUR500; for legal entities, it ranges from EUR5 to EUR5,000.

Tax fraud is punishable by imprisonment of up to three years or up to 360 day-fines, while aggravated tax fraud is punishable, for individuals, by imprisonment for from one to five years and, for legal entities, by a fine ranging from 240 to 1,200 day-fines, increasing to two to eight years’ imprisonment for individuals and 480 to 1,920 day-fines for legal entities where the undue advantage exceeds EUR200,000.

Failure to pay over tax withheld or collected is punishable by imprisonment of up to three years or a penalty of up to 360 day-fines, increasing to one to five years’ imprisonment for individuals and penalties of between 240 and 1,200 day-fines for legal entities where the amount exceeds EUR50,000.

Most tax offences and criminal cases in Portugal originate within the scope of a tax audit conducted by the PTA, during which the PTA assesses not only the correctness of the taxpayer’s position but also whether the facts identified may constitute an administrative offence or a tax crime.

The inspection report usually addresses both aspects, setting out any additional tax and interest assessed and indicating whether the same facts may trigger administrative or criminal liability. Consequently, tax assessments and infringement proceedings frequently commence in parallel.

Where the matter qualifies as an administrative offence, the PTA initiates the relevant procedure. If there are indications of a tax crime, the case must be referred to the Public Prosecutor. Although administrative and criminal proceedings may arise from the same facts, criminal proceedings take precedence. Once a formal indictment is issued, the administrative offence case is dismissed.

Tax disputes, administrative offence proceedings and criminal proceedings may run concurrently, as they are legally autonomous. However, if the offence depends on whether the tax assessment is upheld, the infringement proceedings are suspended until the tax dispute is finally resolved.

Administrative offence proceedings begin with an investigation conducted by the PTA, followed by a statement of charges, where appropriate. The taxpayer may present a defence before a final decision is issued. Decisions imposing fines may be challenged before administrative and tax courts, with the possibility of further appeal.

Criminal proceedings are governed by the general provisions of criminal procedure. The Public Prosecutor leads the investigation and determines whether to bring charges. If the case proceeds to trial, the criminal court rules on liability and sanctions, subject to appeal.

In summary, the PTA is responsible for audits, assessments and administrative offences proceedings, while the Public Prosecutor and criminal courts handle tax crimes. Administrative and tax courts review assessments and fines. Although tax and criminal functions are institutional separate, the system allows coordinated parallel proceedings where based on the same facts.

Multilateral Instruments

Portugal’s framework for administrative co-operation in tax matters is grounded in both multilateral and EU instruments. At global level, Portugal is a party to the OECD/Council of Europe Multilateral Convention on Mutual Administrative Assistance in Tax Matters, as amended by the 2010 Protocol.

The Convention provides a comprehensive legal basis for exchange of information on request, spontaneous exchange, automatic exchange, simultaneous tax examinations and assistance in the recovery of tax claims.

In addition, Portugal implements internationally agreed standards developed within the OECD framework, including the CRS for the automatic exchange of financial account information and the CbCR framework between tax authorities.

EU Framework

As an EU member state, Portugal is bound by DAC, the EU Directive on Administrative Cooperation, as amended (DAC2 through DAC8). These successive measures have significantly expanded the scope of automatic and spontaneous exchange of information within the EU, encompassing financial account data, advance cross-border rulings, country-by-country reports, mandatory disclosure of cross-border arrangements (DAC6), digital platform operators and crypto-asset reporting.

In addition, administrative co-operation in VAT matters is governed by Council Regulation (EU) No 904/2010, which directly applies in the member states and establishes mechanisms for information exchange, coordination and joint actions aimed at combating VAT fraud.

Recovery Assistance and Bilateral Treaties

Administrative co-operation in the recovery of tax claims within the EU is regulated by Council Directive 2010/24/EU. This Directive allows the PTA to request assistance from other member states in collecting tax debts and, conversely, to recover foreign tax claims in Portugal under harmonised procedures.

Portugal’s extensive network of DTTs, largely based on the OECD Model, also includes exchange-of-information provisions. These facilitate the exchange of information with treaty partners outside the EU and complement both the multilateral and EU-based instruments.

Taken together, these instruments form an integrated system under which the PTA exchanges information, participates in joint administrative actions and provides mutual assistance in both assessment and enforcement matters.

Portugal exchanges tax information on an automatic, spontaneous and on-request basis.

Exchange of information on request is carried out pursuant to the DAC, as well as under DTTs or tax information exchange agreements concluded with non-EU jurisdictions. Spontaneous exchanges take place where the PTA identifies information that may be relevant to the tax authorities of another jurisdiction.

Automatic exchange applies to multiple categories of data, including financial account information (CRS/DAC2), country-by-country reports (DAC4), advance cross-border rulings, reportable cross-border arrangements (DAC6), and, more recently, information relating to digital platforms (DAC7) and (soon to be) crypto-assets (DAC8). Portugal also exchanges financial account information with the US under the FATCA intergovernmental agreement.

Portugal has participated in the OECD’s International Compliance Assurance Programme (ICAP) since 2024.

At EU level, Portugal allows for simultaneous controls and joint audits with other member states under the DAC, as implemented and amended by domestic provisions. These mechanisms enable coordinated audits and, where appropriate, the participation of foreign officials in administrative proceedings.

Portugal is also a party to the OECD/Council of Europe Multilateral Convention on Mutual Administrative Assistance in Tax Matters, which enables exchange of information and other forms of administrative cooperation with a broad range of jurisdictions.

In the field of VAT, Portugal participates in Eurofisc, the EU network established to enhance cooperation and combat cross-border VAT fraud.

Portugal does not maintain a standalone domestic Mutual Agreement Procedure (MAP) regime independent of its international obligations.

The MAP framework is primarily based on Article 25 of Portugal’s DTTs, which generally follow the OECD Model.

At EU level, Portugal has implemented Directive (EU) 2017/1852, providing for a structured MAP procedure and, where necessary, mandatory binding arbitration between member states.

Portugal also applies the EU Arbitration Convention in cases involving transfer pricing and permanent establishment disputes, and certain treaties, as modified by the MLI, may include mandatory arbitration provisions depending on Portugal’s reservations.

The applicable deadline in Portugal is generally three years from the date of first notification of the action giving rise to the dispute, subject to confirmation under the relevant DTT or legal instrument.

Mandatory binding arbitration is available in Portugal in cases falling within the scope of EU law and under certain DTTs (including those modified by the MLI), but it is not universally applicable under all DTTs nor provided as a standalone domestic mechanism.

Portugal has an advance pricing agreement (APA) programme established under its domestic law. APAs allow taxpayers to agree in advance with the PTA on the transfer pricing methodology applicable to transactions with related parties.

APAs may be unilateral, bilateral or multilateral. Where the relevant transactions involve associated legal entities resident in jurisdictions with which Portugal has concluded a DTT, the taxpayer may request a bilateral or multilateral APA, involving the competent authorities of the relevant jurisdictions.

The procedure is initiated through a formal request submitted to the PTA. Once concluded and accepted by the taxpayer, the APA is binding on the tax authorities for the agreed period.

Portuguese law provides for binding rulings as a mechanism to obtain advance tax certainty. Taxpayers may request a binding ruling from the PTA regarding the interpretation and application of tax law to a specific factual situation, including both domestic and international tax matters, such as cross-border transactions, PE issues and DTT interpretation.

Binding rulings are issued upon request and are binding on the PTA in relation to the requesting taxpayer, provided that the facts disclosed are complete and accurate and that the relevant legal and factual circumstances remain unchanged. An expedited procedure is available, subject to the payment of a statutory fee.