Your First IRS Return in Portugal: Foreign Income and Annex J

1. Who must file?

People who are tax residents in Portugal (residente fiscal) must report their worldwide income here. Autoridade Tributária states it plainly: “Os residentes em Portugal têm de declarar em Portugal todos os rendimentos, obtidos tanto no nosso país como no estrangeiro.”

If you receive rent from Türkiye, dividends from a Turkish company, foreign bank interest or self-employment income paid from abroad, those amounts belong in your Portuguese return.

How is tax residency determined?

Residency is not decided by a single document. Spending more than 183 days in Portugal during the year, having a habitual residence here, or having the centre of your economic interests here are all relevant. Legal basis: CIRS art. 16.

Does everyone have to file? No — for some income types and amounts filing may not be mandatory. Those exceptions depend on income category, amount and whether withholding was final. Check the current conditions in Portal das Finanças; when in doubt, filing is usually the safer route.

2. Deadlines

The Modelo 3 IRS return is filed between 1 April and 30 June of the year following the income year.

3. Which annexes are used?

Modelo 3 is the main return; annexes are added depending on the type of income. The forms used in 2026 were approved by Portaria no. 104/2026 (5 March) and apply to 2025 income.

You may need several annexes at once (e.g. Portuguese salary + Turkish rent = Annex A + Annex J).

4. The boxes inside Annex J

Annex J is not a single field; it is divided into boxes (quadros) by income type. The structure published by the tax authority:

5. What goes into each box?

The tax authority's instruction rests on three items:

1. Gross income — before foreign tax is deducted (ilíquido de imposto pago no estrangeiro). Not the amount you received net.
2. Mandatory social security contributions — compulsory contributions charged on that income, where applicable.
3. Tax paid abroad — income tax paid in the source country.

Income in currencies other than the euro is converted into euro. Follow the tax authority's year-specific instruction and the form's help text on which exchange rate and date to use — do not pick a rate by preference.

6. How double taxation is avoided

Tax paid in Türkiye is credited against the tax calculated in Portugal. The tax authority describes it as crédito de imposto por dupla tributação internacional, taken into account when the final tax is assessed.

• The credit is limited to the Portuguese tax attributable to that income — if foreign tax exceeds it, the excess is not automatically refunded.
• To use the credit, the foreign tax paid must be documented.
• The calculation combines treaty provisions and domestic law.

7. The Portugal–Türkiye double taxation treaty

A treaty between the two countries on taxes on income is in force and is published in the tax authority's “Convenções para Evitar a Dupla Tributação” section.

• It sets, by income type (dividends, interest, royalties, pensions, professional services, property), which state may tax and to what extent, and the method used to eliminate double taxation.
• Where the treaty and domestic law conflict, the treaty prevails — but applying it requires documentary evidence in each file.
• This guide does not reproduce treaty rates. Rates differ by income type and are set out in the text itself; filing with a wrong rate creates penalty risk.

Official text: Portugal–Türkiye Convention (PDF, tax authority)

8. Documents to prepare

• Evidence of the foreign income (lease, interest statement, dividend resolution, employment contract)
• Proof of tax paid abroad (assessment/payment document, withholding certificate) — required for the credit
• The exchange rate source and date used to convert into euro
• IBAN, bank name and balances for foreign accounts (Quadro 11)
• Portuguese income documents for Annex A/B/C (payslips, recibos verdes, e-Fatura records)
• Identity document, NIF and Portal das Finanças access

9. Step by step

1. Log in to Portal das Finanças (NIF + password; CMD also works).
2. Go to IRS → Entregar Declaração. A pre-filled return may be offered — do not approve it without checking.
3. Select Modelo 3 and tick the annexes you need (Annex J for foreign income).
4. Complete the relevant Annex J boxes: gross amount, mandatory social security contributions, foreign tax paid.
5. Complete Quadro 11 (foreign accounts).
6. Add Annex H if you have deductions or benefits.
7. Check the summary: tax assessed, foreign tax credited, amount payable or refundable.
8. Submit and download the comprovativo (acknowledgement) for your records.

10. Common mistakes

• Entering net amounts. The return asks for gross income; entering the after-tax figure understates income.
• Leaving Quadro 11 empty. Foreign accounts must be reported even with no income.
• Claiming foreign tax without evidence. The credit is not granted without documentation.
• Getting the exchange rate date wrong. The form's instructions determine which date/rate applies.
• Not filing at all. “I already paid tax in Türkiye” does not remove the filing obligation — the credit exists for that reason.
• Copying last year's figures. Forms and instructions change every year.

11. FAQ

What happens if I do not report Turkish rental income?

You risk an incomplete return. As a resident you must report worldwide income, and the tax authority requests foreign income through Annex J. If identified later, additional tax, interest and penalties may follow.

Can I get back the tax I paid in Türkiye?

No. The mechanism is a credit, not a refund: it reduces the Portuguese tax. If foreign tax exceeds the Portuguese tax on that income, the excess is generally not refunded.

I have no income but a Turkish bank account — do I still file?

If you are a resident and required to file, account reporting (Quadro 11) applies. Having no income on the account does not remove the reporting obligation.

I missed the deadline — can I fix it?

Yes, a replacement return (declaração de substituição) can be filed. Interest and penalties may apply; the amount depends on the delay and the circumstances. This guide does not quote amounts.

Is this legal advice?

No. It is general information. Check the official sources and consult a licensed accountant before filing.

12. Sources

• Autoridade Tributária — Rendimentos obtidos no Estrangeiro
• Autoridade Tributária — CIRS art. 16 — Residence
• Autoridade Tributária — Portugal–Türkiye Convention
• Autoridade Tributária — Annex J form (PDF)
• Portaria no. 104/2026 (5 March) — Modelo 3 and annexes for 2025 income (secondary summary: Belim)
• Portal das Finanças — return submission

13. Related guides

These steps normally come before filing. Without a NIF, social security number, bank account and registered address, the filing process stalls.

14. Legal disclaimer

This content is provided for general information only. It is not legal, tax, financial, investment or immigration advice and does not create a professional–client relationship. Legislation, fees, timelines and administrative practice may change. Before acting, verify the current information with the relevant official authority and consult a qualified professional for your own situation.

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