Filing Your IRS Tax Return in Portugal: Deadlines, Tax Brackets, Deductions, and a Step-by-Step Guide for 2026

Tax season in Portugal is open. If you earned income in Portugal during 2025, you must file your annual IRS (Imposto sobre o Rendimento das Pessoas Singulares) declaration by 30 June 2026. The entire process is digital, handled through the government's Portal das Finanças — and while the interface is mostly in Portuguese, the logic is straightforward once you know what to expect.

This guide walks through the key dates, how filing works, what you can deduct, and what the current tax brackets look like. It applies to anyone who was a tax resident in Portugal for all or part of 2025, including expats, remote workers, and retirees.

Key Dates for IRS 2026

The IRS calendar runs on a strict schedule set by the Autoridade Tributária e Aduaneira (AT), Portugal's tax authority.

• By 25 February (extended to 2 March 2026): Validate all invoices on the e-Fatura portal. Every invoice issued with your NIF during 2025 must be assigned to the correct expense category — health, education, housing, general family expenses, or professional costs.
• By 2 March: Update your household composition (agregado familiar) on the Portal das Finanças if anything changed in 2025 — marriage, divorce, new dependents, or a child turning 18.
• 16–31 March: The AT publishes your provisional deduction amounts. Check these against your own records.
• 1 April – 30 June: Filing window. Submit your IRS declaration online.
• 31 August: Deadline for paying any additional tax owed. Refunds are typically processed within this timeframe too.

Two Ways to File: Automatic IRS or Modelo 3

Portugal offers two filing paths, and the system will tell you which one applies when you log in.

Automatic IRS (IRS Automático)

The tax authority pre-fills your declaration using data from employers, banks, and other entities. You review it, confirm it is correct, and submit. If you do nothing, the pre-filled return is automatically accepted at the end of the filing period.

Automatic IRS is available to taxpayers with straightforward situations — typically employees or pensioners with income only from Categories A (employment) or H (pensions), who are not claiming specific manual deductions.

Modelo 3

Everyone else files via the Modelo 3 form, which allows you to declare rental income (Annex F), capital gains from property or shares (Annex G), cryptocurrency disposals (also Annex G), and foreign-source income (Annex J). If you have income from self-employment (Category B), you will also use Modelo 3.

Expats with income from outside Portugal should pay particular attention to Annex J, which is where worldwide income is reported. Double-taxation agreements — Portugal has them with most EU countries, the US, the UK, and dozens of others — are applied here.

Portugal's 2026 IRS Tax Brackets

Portugal uses nine progressive tax brackets. The 2026 State Budget (OE2026) reduced rates on brackets two through five by 0.3 percentage points compared to 2025, providing modest relief for low-to-middle earners.

These are marginal rates, meaning only the income within each bracket is taxed at that rate — not your entire income.

Additional Surcharges

• Municipal surcharge (derrama municipal): Up to 1.5 per cent on taxable income above EUR 8,342, depending on your municipality. Most councils in Lisbon, Porto, and the Algarve apply some level of surcharge.
• Solidarity surcharge (taxa adicional de solidariedade): 2.5 per cent on income between EUR 80,000 and EUR 250,000, and 5 per cent above EUR 250,000.

What You Can Deduct

Portugal's deduction system rewards taxpayers who collect invoices with their NIF throughout the year. These are the main categories:

• Specific deduction: EUR 4,597.09 is automatically subtracted from employment (Category A) and pension (Category H) income before tax is calculated.
• General family expenses: 35 per cent of general expenses, up to EUR 250 per taxpayer (EUR 500 for a couple filing jointly).
• Health: 15 per cent of health expenses, up to EUR 1,000.
• Education: 30 per cent of education expenses, up to EUR 800.
• Housing: 15 per cent of rent or mortgage interest, up to EUR 502. The 2026 budget raised the rent deduction ceiling to EUR 900 for contracts up to a certain value.
• Care homes (lares): 25 per cent of costs, up to EUR 403.75.
• Domestic workers: A new deduction for 2026 — 5 per cent of domestic worker expenses, up to EUR 200.
• Cultural expenses: Books and cultural events are deductible for the first time in 2026 under a one-year pilot measure through the exigência de fatura system.

The minimum guaranteed income (mínimo de existência) was raised to EUR 12,880 for 2026, meaning anyone earning below this threshold pays no IRS at all.

Step-by-Step: How to File

1. Log into the Portal das Finanças at portaldasfinancas.gov.pt. You need your NIF and password. You can also use your Chave Móvel Digital or Cartão de Cidadão for authentication. If you have forgotten your password, request a new one early — it arrives by post and can take several days.
2. Check your eligibility. The system will indicate whether you qualify for Automatic IRS or must file via Modelo 3.
3. Review the pre-filled data. Verify your personal details, tax residency status, marital status, dependents, income amounts, and deductions.
4. Add any missing income. If you have rental income, capital gains, foreign income, or self-employment earnings, add the relevant annexes.
5. Run a simulation. Before submitting, use the built-in simulator to see whether you will receive a refund, owe additional tax, or come out neutral.
6. Submit. Confirm and submit the declaration. You will receive a confirmation receipt with a reference number.
7. Monitor your settlement. Refunds are paid by bank transfer to the IBAN registered with the AT. If you owe tax, pay by 31 August through Multibanco, MB Way, or direct debit.

Special Situations for Expats

IFICI (Former NHR) Regime

If you are registered under the new IFICI regime (which replaced the Non-Habitual Resident programme), a flat 20 per cent rate applies to qualifying Portuguese-source employment and self-employment income. Foreign-source income may be exempt under certain conditions. File via Modelo 3 and ensure your IFICI status is correctly reflected.

Partial-Year Residency

If you became a Portuguese tax resident part-way through 2025, you are taxed on your worldwide income from the date residency began. Income earned before that date in another country may still need to be declared on Annex J, depending on the applicable double-taxation treaty.

Married Couples

Married couples and civil partners can file jointly or separately. Run the simulator both ways — joint filing is not always more favourable, particularly when one partner earns significantly more than the other.

Common Mistakes to Avoid

• Missing the e-Fatura validation deadline. If invoices are not assigned to the correct category by early March, you lose those deductions.
• Forgetting Annex J. Foreign bank interest, dividends, rental income, or pensions must be declared even if tax was already paid abroad.
• Not updating household composition. A new dependent or a change in marital status affects your tax calculation.
• Ignoring the simulator. Submitting without simulating first can lead to surprises in August.

Where to Get Help

The AT provides free in-person assistance at local Finanças offices (Serviços de Finanças) during filing season, though queues can be long. Many expats use a certified accountant (contabilista certificado) — expect to pay EUR 100 to EUR 300 for a standard return. English-speaking tax advisers in Lisbon, Porto, and the Algarve are increasingly common.

The Portal das Finanças also has a live chat function and a support line, though both operate primarily in Portuguese.