Filing your Portuguese IRS tax return can feel complicated when you are managing employment income, freelance work, household expenses or income from another country. The process becomes easier when you understand the deadlines, check the information already supplied to the tax authority and know which parts of your return need your attention.
This guide covers the 2026 filing season for income earned during 2025. It explains the main steps for employees, self-employed workers and eligible young taxpayers, with official resources from Portugal's Autoridade Tributária e Aduaneira (AT).
1. Key IRS deadlines for 2026
The 2026 filing season concerns income received between 1 January and 31 December 2025. The main annual filing window for the Modelo 3 IRS declaration is 1 April to 30 June 2026.
- By 2 March 2026: the main deadline for validating invoices in e-Fatura and completing certain household and tax-related updates for the 2025 tax year. Check the specific task and applicable deadline on the AT portal.
- 16–31 March 2026: check the deductible-expense information made available by the AT and submit complaints about eligible missing or incorrect general-family and invoice-related deductions where the portal permits.
- 1 April–30 June 2026: confirm the IRS Automático declaration if it accurately reflects your situation, or submit the required Modelo 3 declaration and annexes.
- 31 August 2026: the statutory deadline for issuing refunds arising from returns submitted within the legal filing period, subject to applicable legal exceptions.
Deadlines can differ for specific obligations. Consult the official AT IRS deadlines page rather than treating this summary as a substitute for checking your own obligations.
2. Prepare before submitting your declaration
Before opening your tax return, sign in to the Portal das Finanças and check the information recorded under your NIF. Keep your access credentials secure and never share your password or authentication codes with someone offering to file your return.
Check your invoices in e-Fatura
Review invoices associated with your NIF and check whether expenses have been assigned to the correct categories. Where a receipt appears missing or misclassified, follow the correction process and deadlines shown by the AT.
Some expenses, including certain health purchases taxed at the standard VAT rate, may require a valid medical prescription to qualify as health expenditure. An invoice is not automatically eligible for a particular deduction simply because it contains your NIF.
Official guidance: AT guidance on deductions.
Check your household details
Verify the household composition and other details relevant to your tax return. Incorrect marital, dependent or household information can affect the result. If you are married or qualify as being in a de facto union under Portuguese tax rules, compare the available separate and joint taxation calculations before deciding which option to use.
Check your bank account details
If you expect a refund, confirm that the IBAN registered with the AT is current and valid. A refund is not guaranteed: it depends on the final tax calculation, including tax withheld or paid in advance and the deductions allowed under the applicable rules.
3. IRS Automático or Modelo 3?
IRS Automático is a pre-filled declaration available only to taxpayers who meet the AT's eligibility conditions. It is not suitable for every taxpayer or every income situation.
Review the provisional declaration and its calculation carefully. If the information is complete and correct, you can confirm it within the filing period. If it is incomplete or does not reflect your circumstances, do not confirm it; submit the appropriate declaration instead.
If an eligible taxpayer does not confirm IRS Automático by the end of the filing period, the AT states that the provisional declaration is converted automatically into a definitive declaration. This does not mean every taxpayer should simply do nothing: the pre-filled information may not reflect all relevant circumstances, and some taxpayers must file a different declaration or include additional annexes.
Start with the official IRS Automático eligibility and filing guidance.
4. Employees: Category A income
If you work as an employee, your salary and tax withheld are generally reported to the AT by your employer. However, you should still compare the pre-filled information with your annual income records and payslips.
- Check the annual employment income and tax withheld.
- Review deductible expenses and household details.
- Check whether you have other income that requires additional reporting.
- Assess whether you qualify for IRS Jovem or another applicable tax treatment.
- Compare joint and separate taxation where both options are legally available to your household.
Do not assume that a particular annual salary automatically exempts you from filing. The obligation to submit a return depends on the applicable rules and your complete income circumstances. Consult the AT's Modelo 3 guidance and official rules on exemption from filing.
5. Freelancers: Category B income
If you work independently, issue recibos verdes or earn other business or professional income, you may need to report it under Category B. The correct treatment depends on the activity, your tax regime and your full circumstances.
The simplified regime
Under the simplified regime, taxable income is generally calculated by applying the statutory coefficient appropriate to the type of income, subject to the detailed rules and adjustments in the IRS Code. Common coefficients include 0.75 for specified professional activities and 0.35 for certain other service income. A coefficient of 0.15 applies to specified categories, including sales of goods and certain activities; it is not a universal coefficient for all freelancers.
For some income subject to the 0.75 or 0.35 coefficients, the deduction is partly conditional on supporting expenses and contributions under the statutory rules. The relevant calculation is more specific than a blanket instruction to prove that exactly 15% of gross income was spent on business costs.
The rules can also include reductions to certain coefficients in the first and following year of activity, but eligibility conditions apply. For example, the relevant reduction may not apply if you receive Category A or H income during those periods, and other statutory restrictions can apply. Do not assume that every new freelancer automatically receives a 50% reduction in the first year and 25% in the second.
Check the AT's current self-employment tax guidance and the applicable Article 31 of the IRS Code.
Keep business records and separate your cash
Maintain records of invoices, professional purchases, contributions and tax payments. Keep personal and business spending distinguishable where possible. Set aside a cash reserve for tax and Social Security obligations based on your actual income and payment schedule rather than relying on a fixed percentage that may not fit your situation.
Check Anexo SS separately
Some self-employed taxpayers must submit Anexo SS with their annual IRS declaration, while exemptions and exceptions apply to others. Do not assume that every person with an active independent activity has exactly the same obligation. Check the Social Security guidance and the instructions shown in the declaration process.
6. IRS Jovem: who may qualify?
IRS Jovem provides a partial IRS exemption for eligible employment and professional income. Under the rules applicable to income earned from 2025, the regime generally covers qualifying taxpayers who are no older than 35 on 31 December of the relevant tax year, are not treated as dependants for the relevant purpose and meet the other legal conditions.
The exemption schedule is based on the year of eligible income, not simply on age:
- Year 1: 100% exemption.
- Years 2–4: 75% exemption.
- Years 5–7: 50% exemption.
- Years 8–10: 25% exemption.
The exemption is subject to a statutory ceiling linked to 55 times the IAS and to other eligibility requirements. The applicable ceiling depends on the tax year. Do not use the 2026 IAS value to calculate the ceiling for income earned in 2025.
The regime is not available to everyone under 36. Restrictions include having benefited from specified alternative tax regimes, including the former Non-Habitual Resident regime, the applicable ex-resident regime or the IFICI incentive, as well as other legal conditions. Your previous income years may also affect which stage of the ten-year schedule applies.
For income earned in 2025 and declared in 2026, consult the official IRS Jovem 2025 information leaflet and the AT's instructions for the relevant declaration fields.
7. Understand your deductions
Eligible deductions reduce the tax calculated under the applicable rules. They do not necessarily produce a refund equal to the amount of the expense multiplied by a percentage. The final result depends on your tax liability, applicable limits, household circumstances and the rules for each deduction.
- General family expenses: the standard deduction is generally 35% of eligible expenditure, subject to the statutory limit and household rules.
- Health expenses: qualifying expenses are generally deductible at 15%, subject to the applicable limit and conditions.
- Education and training: qualifying expenses are generally deductible at 30%, subject to the relevant limit and eligibility rules.
- Rent and housing costs: eligibility and limits depend on the type of expense and the legal conditions. Confirm that the relevant rental information has been reported correctly.
- Other deductions: dependants, pension contributions, donations and other eligible expenses may be treated under their own rules.
Use the AT's official 2025 income deductions, benefits and tax rates guide for the applicable amounts. Do not assume that you will recover a specific amount simply by submitting invoices or checking a category.
8. Foreign income, accounts, investments and property
If you are a Portuguese tax resident, your reporting obligations may include income earned outside Portugal. The applicable treatment can depend on tax residence, the type and source of income, any relevant tax treaty and whether foreign tax was paid.
Foreign income may require an additional annex, such as Anexo J. The declaration can also request information about certain accounts held with financial institutions outside Portugal, even where those accounts did not generate income. The exact reporting obligation depends on the relevant form and circumstances.
Do not assume that every foreign asset, cryptocurrency holding or overseas property belongs in one specific annex. Different types of income and transactions are reported under different rules. Check the official AT guidance on foreign income and the current declaration instructions.
9. Before you submit: a practical checklist
- Check your NIF details and household composition.
- Review the income and withholding amounts supplied by employers, banks and other reporting entities.
- Review e-Fatura and the deductible expenses displayed by the AT.
- Confirm that you are using IRS Automático only if you qualify and the information is correct.
- Include the relevant annexes for freelance, foreign, investment, property or other income where required.
- Check whether IRS Jovem or another tax regime applies to your circumstances.
- Use the available simulation to review the estimated result, while remembering that a simulation is not a guarantee of the final assessment.
- Verify your IBAN if you expect a refund.
- Save the submission receipt and retain supporting records.
10. Can you consign 1% of your IRS?
Eligible taxpayers can choose to consign a portion of their IRS to an approved beneficiary under the applicable rules. This option is distinct from a tax deduction and does not automatically increase your refund. Check the available beneficiaries and options in the Portal das Finanças before submitting.
Watch the companion video
The video below was published before the corrections in this guide. It contains statements about the February deadline, deduction amounts, freelancer rules and penalties that should not be treated as current official instructions. Use it as background only, and verify the relevant details against the official AT resources linked in this article.
Official resources
- AT: Modelo 3 annual declaration
- AT: IRS Automático
- AT: IRS deadlines
- AT: Deductions, benefits and tax rates for 2025 income
- AT: Self-employment income
- AT: IRS Jovem 2025 leaflet
- AT: Foreign income
Important: This guide provides general information, not an individual tax assessment. Tax treatment depends on your income, tax residence, household and eligibility. Check the official AT instructions for your circumstances before filing.
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