Filing Your IRS in Portugal as a Foreign Resident: A Step-by-Step Guide for 2026

Tax season in Portugal opened on 1 April and runs until 30 June 2026. For the country's growing population of foreign residents — from digital nomads on the Non-Habitual Resident (NHR) successor regime to long-term expats with Portuguese employment contracts — filing the annual IRS return can be one of the most confusing parts of settling in. This guide covers what you need to know, step by step.

Who needs to file

If you were a tax resident in Portugal for any part of 2025, you are generally required to submit an IRS return covering your worldwide income. Portugal considers you a tax resident if you spent more than 183 days in the country during the year, or if you maintained a habitual residence here on 31 December 2025.

There is one key exemption: taxpayers whose annual income was below 8,500 euros and consisted entirely of employment or pension income are not required to file. The same applies to those who received only income subject to withholding tax at source (taxas liberatórias), regardless of the amount — unless they hold assets in offshore jurisdictions, in which case filing is mandatory.

IRS Automático: the fast track

Since 2017, Portugal has offered an automatic tax return system — the IRS Automático. The Autoridade Tributária pre-fills your return based on employer and institutional data submissions. Each year, the system expands: in 2026, it now covers beneficiaries of the IRS Jovem (Young IRS) programme for the first time.

You may be eligible for IRS Automático if you earned employment income (Category A), pensions (Category H), or self-employment income (Category B) under the simplified regime from a single activity. The system also now covers taxpayers who reported wages paid to domestic workers.

A critical point for foreign residents: if you do not actively confirm or reject the automatic return by 30 June, the provisional declaration becomes your final, legally binding submission. This can be a problem if the pre-filled data is incomplete or incorrect — which, for expats with foreign income or complex situations, it often is.

Step-by-step filing process

1. Access the Portal das Finanças. Go to portaldasfinancas.gov.pt and log in with your NIF (tax identification number) and password. If you have not yet registered for online access, you will need to do so first — this can be done online but may require verification.

2. Check your pre-filled data. Under 'IRS', select 'Consultar Declaração' to review what the tax authority has on file. Cross-reference employer income (recibos de vencimento), bank interest statements, and any invoices registered against your NIF throughout 2025.

3. Choose your filing method. If the IRS Automático option appears and the data looks correct, you can confirm it with a single click. If not, or if you need to declare foreign income, investments, rental income, or claim specific deductions, you must file a manual Modelo 3 return.

4. Declare worldwide income. This is where many expats make mistakes. As a Portuguese tax resident, you must declare income earned anywhere in the world — including rental income from property abroad, dividends from foreign investments, or freelance work for non-Portuguese clients. Use Anexo J for foreign income.

5. Claim deductions. Portugal allows deductions for health expenses, education costs, housing (mortgage interest or rent), care home fees, and general family expenses. These are largely pre-populated based on invoices linked to your NIF, but you should verify them. You can also claim the IRS consignation — directing 1 percent of your tax to a charity or institution of your choice.

6. Submit and save. After reviewing, submit the declaration electronically. Download the PDF confirmation for your records. The Autoridade Tributária will process the return and, if a refund is due, transfer it to the bank account registered in the system.

Refund timelines

The government announced this year that taxpayers using IRS Automático can expect refunds within two weeks of submission. Those filing manually via Modelo 3 should receive refunds within three to three and a half weeks. Amounts below 10 euros are not paid out.

For context, Portugal's IRS filing season launched on 1 April with expanded automatic coverage. The system has matured significantly, but foreign residents with complex income profiles should consider reviewing their returns carefully before confirming.

Common pitfalls for expats

Forgetting Anexo J. Foreign-source income must be declared on Anexo J. Failing to include it can result in penalties and back taxes when the Portuguese tax authority exchanges information with other countries under the Common Reporting Standard (CRS).

NHR successor regime confusion. The original NHR regime closed to new applicants in 2024, replaced by a narrower incentive targeting specific professions and researchers. If you are on the old NHR regime, your special tax rates still apply for the 10-year duration. If you applied under the new scheme, check which income categories qualify for favourable treatment.

Double taxation treaties. Portugal has treaties with most EU countries, the US, UK, Canada, Brazil, and many others. These can prevent you from being taxed twice on the same income, but you must actively claim the treaty benefit in your return.

Missing the deadline. If you miss 30 June, you can still submit late — before receiving a notification from the tax authority — with a minimum fine of 25 euros. After notification, the penalty increases. For IRS Automático users, the provisional return simply becomes final, which may not be in your interest.

When to get professional help

If you have income from multiple countries, capital gains from property or investments, or are navigating the NHR successor regime, consider engaging a Portuguese tax consultant (contabilista certificado). The cost typically ranges from 75 to 200 euros for a standard return and can save significantly more in avoided errors.

Filing taxes is never glamorous, but Portugal's system has become increasingly accessible. For most expats with straightforward employment income, IRS Automático genuinely works — confirm the data, submit, and expect your refund in about two weeks. For everyone else, the manual Modelo 3 is your friend, and the 30 June deadline gives you nearly three months to get it right.

Related reading: Cost of living in Portugal 2026 | Nationality law changes | Driving in Portugal guide | Learning Portuguese guide