A recent arbitration ruling has reignited an old but fundamental debate: should foreign-source capital income exempt under Portugal’s Non-Habitual Resident (NHR) regime influence the progressive tax rate applied to a taxpayer’s other income?
This question sits at the centre of Processo 10/2025-T (CAAD, October 31, 2025), a case that interpreted Article 81(7) of the Personal Income Tax Code (CIRS) in a way that many tax professionals, and the structure of the NHR itself, do not support.
In this article, we analyse the decision, explain why it raises technical concerns, and explore what it means in practical terms for individuals who still benefit from the NHR regime. Our focus is on the relationship between NHR taxation on capital gains, foreign-source investment income, and Portugal’s semi-dual income tax model.
1. Summary of the 2025 Arbitration Decision
The arbitration tribunal held that:
- Foreign-source investment income exempt under Article 81(5) CIRS must be included (“englobado”) for the purpose of determining the marginal tax rate applicable to other income.
- The tribunal argued that since no special flat rate under Article 72 applies to these exempt Category E incomes, they fall under the general rule of Article 81(7): exemption with progression.
In practical terms, this means that exempt dividends, interest, or capital gains, even when correctly exempt under NHR rules, may inflate the progressive rate that applies to other types of income (e.g., pension income, self-employment income, rental income).
This interpretation has broad implications for NHR taxation on capital gains and for exempt capital income generally.
2. Why the Tribunal’s Interpretation Is Technically Problematic
2.1 A Circular Reading of the Law
The tribunal argues:
- The income is foreign-sourced, so it is exempt under Article 81(5).
- Since no Portuguese withholding tax was applied, the Article 72 flat rates do not apply.
- Therefore, Article 81(7) requires automatic englobamento for rate-determination.
This reasoning is circular:
- The income is exempt precisely because it is foreign-source under the NHR method of exemption.
- The fact that the Article 72 flat rate does not apply cannot be used to override the purpose of the exemption regime.
- Applying progression to exempt capital income effectively converts a flat-rate category into a progressive one, contradicting the architecture of Portuguese income tax.
2.2 It Contradicts the Ratio of the NHR Regime
Under the NHR regime, foreign-source:
- Category E (interest, dividends, certain gains),
- Category F (property income), and
- Category G (capital gains)
are typically taxed at flat autonomous rates for regular residents.
The policy intention of NHR was to place beneficiaries in a neutral position: exempting these foreign-source incomes should also mean they do not influence progressive tax rates, just as flat-tax income for ordinary residents does not.
Applying rate-determination to exempt Category E or G income produces the opposite effect: it artificially increases the taxation of income that is progressive by nature (such as employment income)
.2.3 The Legal Structure of Article 81(7) Supports Optionality, Not Automatic Progression
Article 81(7) explicitly links englobamento to the taxpayer’s option for the credit method in cases where foreign-source income would otherwise be taxed in Portugal.
This means:
- Englobamento is triggered by choice, not by default.
- It aligns with the worldwide practice of requiring aggregation when a credit method is used, not when the exemption method applies.
- The reference back to Article 72 rates reinforces that autonomous categories remain autonomous.
2.4 Portugal’s Semi-Dual Income Tax System Confirms the Error
Portugal operates a semi-dual PIT model:
- Labour income → progressive rates
- Capital income → flat rates
- Capital gains → mostly flat or specialised rules
- Rental income → flat regimes available
- Some categories → optional englobamento
Within this architecture, exempt capital income cannot logically influence progressive brackets, unless the taxpayer voluntarily opts into a regime that requires aggregation.
The tribunal’s reading collapses this structure and incorrectly merges autonomous and progressive categories.
3. Implications for NHR Taxation on Capital Gains and Capital Income
3.1 What Should Happen in Practice
For current NHR beneficiaries, there is a strong technical basis to argue:
- Foreign-source Category E income exempt under Article 81(5) should not impact progressive tax rates.
- Foreign-source Category G capital gains, which are treated as exempt under NHR rules, should also not trigger progression.
- Progressivity should only apply where the taxpayer voluntarily adopts the credit method (which necessarily requires englobamento).
3.2 What the Arbitration Decision Suggests
The decision indicates that:
- Taxpayers may face assessments applying the exemption with progression even if they do not choose the credit method.
- This could materially increase the tax due on non-capital income.
3.3 Defensive Arguments and Remedies
Taxpayers with NHR status may consider:
- Asserting the lawful application of the exemption method under Article 81(5).
- Challenging automatic englobamento based on statutory interpretation, system coherence, and the ratio legis.
- Using administrative claims, arbitration or judicial litigation where the tax authority applies a progression without legal basis.
4. Key Takeaways for Professionals and NHR Beneficiaries
- The arbitration ruling opens the door to inconsistent assessments regarding NHR taxation on capital gains and other capital income.
- The tribunal’s interpretation conflicts with the nature of semi-dual PIT and the purpose of the NHR regime.
- Substantial legal and technical grounds exist to maintain that exempt foreign-source capital income should not influence progressive tax rates.
- Careful planning and documentation remain crucial, particularly when double tax treaties apply or when taxpayers are deciding between the exemption and credit methods.
Key Takeaways
The 2025 arbitration decision offers a reading of Article 81(7) CIRS that is, in many ways, inconsistent with the design of Portugal’s tax system and with the logic of the NHR regime. For taxpayers still benefiting from NHR, the correct interpretation of NHR taxation on capital gains requires preserving the principle that exempt capital income should not inflate progressive tax brackets.
This article is provided for general informational purposes only and does not constitute legal or tax advice. Portuguese tax rules are subject to change, administrative interpretation, and case-by-case application by the tax authorities. Readers should not act or refrain from acting based on this information and should seek professional advice tailored to their specific circumstances, particularly where matters of international taxation, residency status, NHR eligibility, or double tax treaty application are involved.
The founding of Madeira Corporate Services dates back to 1996. MCS started as a corporate service provider in the Madeira International Business Center and rapidly became a leading management company… Read more
