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Tax Advisors in Portugal

Tax advisors in Portugal help people and businesses establish their Portuguese tax residence and prepare the AT filing for each tax year. We classify Portuguese and foreign income under the CIRS and calculate any foreign tax credit.

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Vineyard terraces above the Douro river near Pinhão

Who Needs a Tax Advisor in Portugal

  • You need to establish your Portuguese tax residence for a year that includes time or a home in Portugal.
  • You receive Portuguese and foreign income and need the residence, source and reporting rules applied together.
  • You paid foreign tax and need the credit limit and the relevant bilateral treaty checked for each income stream.
  • You need Portuguese tax planning or return support that involves investments, property, company interests or more than one country.

Tax compliance work does not include complaints, appeals or other disputes with the tax authority.

What's Included in Tax Compliance Work

You get a quote in writing before any work starts.

  • Residence analysis. A certified accountant applies Articles 15 and 16 of the CIRS to your days, homes and other residence facts for the relevant period.
  • Income and rate review. A certified accountant classifies the agreed income and applies the relevant general, special or other statutory treatment.
  • Foreign-tax-credit analysis. A certified accountant matches the foreign income and tax paid to the credit limits in Article 81 of the CIRS.
  • Treaty review. A certified accountant identifies the relevant residence state, source state, income article, taxing rights and double-tax-relief method.
  • Return preparation and filing. A certified accountant prepares the agreed Portuguese return and supporting schedules for electronic filing with AT.
A decision diagram with day-count, habitual-home, timing and address branches.
Portuguese tax residence depends on days, a home, timing and the AT address record.
Diagram text version

More than 183 days in the statutory 12-month period establishes residence. A shorter stay establishes residence when a home shows habitual intent. Residence begins or ends on the statutory date during the tax year. A resident reports the address change to AT.

What You'll Need to Provide

Residence timeline
Your days in Portugal and other countries, homes available to you, household facts and changes of fiscal address.
Income records
Portuguese and foreign employment, pension, business, property, investment and other income records within the engagement.
Foreign tax evidence
Assessments, payment records, withholding certificates and returns showing the foreign tax connected with each income stream.
Asset and transaction records
The ownership, acquisition, disposal and income documents for property, investments and company interests under review.
Treaty facts
The residence and source countries, income type, payer details and any residence certificate or treaty form already obtained.
Prior Portuguese filings
Portuguese returns, AT assessments, notices, payments and correspondence for the relevant periods.

How Tax Compliance Work Proceeds

A certified accountant prepares the agreed IRS return for electronic filing with the Autoridade Tributária e Aduaneira and flags accounting, investment and cross-border questions along the way.

  1. Establishing the Tax Year and Residence Facts

    A certified accountant records the relevant period, travel days, homes, household circumstances and fiscal-address history.

  2. Classifying Portuguese and Foreign Income

    A certified accountant maps each income stream to its source, CIRS category and supporting evidence.

  3. Applying the IRS Treatment

    A certified accountant applies the relevant brackets, special rates and aggregation rules to the documented income.

  4. Calculating Foreign Tax Credits

    A certified accountant compares the foreign tax paid with the Portuguese credit limit for each income stream.

  5. Checking the Applicable Treaty

    A certified accountant reviews the bilateral convention for the residence state, source state, income article and relief method.

  6. Preparing the AT Filing

    A certified accountant prepares the agreed return and evidence schedule for electronic filing with the Autoridade Tributária e Aduaneira.

Timing and Possible Delays

Set by the tax year and filing calendar

The work is planned around the Model 3 filing period in Article 60 of the CIRS and AT guidance, which runs from 1 April through 30 June for taxpayers who must file the annual return.

What delays it

More time is needed when travel dates, foreign income statements, tax-payment evidence, treaty certificates, transaction records or prior AT filings are incomplete.

What to prepare now

Your residence, income, foreign-tax, asset, treaty and prior-filing records should be organised by tax year before the work begins.

Tax Advisors by Location

The Modelo 3 return is filed on the Portal das Finanças wherever you live. The Serviço de Finanças competent for your taxpayer address handles any assessment or refund that needs an office.

Lisbon

A certified accountant handles residence analysis, your Portuguese IRS return, foreign income, double-tax credits, rental and capital-gains reporting and the payment calendar for a Lisbon taxpayer.

The assessment and refund dates and the questions for the Serviço de Finanças competent for your address are recorded.

Cascais

A certified accountant handles Cascais residence analysis, your Portuguese IRS return, foreign income, double-tax credits and property income.

The Serviço de Finanças competent for your Cascais address is identified when an office visit is needed.

Residence, Foreign Income and Filing Records

The residence evidence file

You separate travel, home and household evidence by tax year before a certified accountant applies Article 16 of the CIRS. A certified accountant reconciles passports, travel records, leases, ownership documents, utility records and fiscal-address changes.

The foreign-income and tax-credit schedule

A certified accountant creates one line for each income stream, source country, gross amount, foreign tax, payment date and supporting certificate. The accountant then maps the line to the relevant CIRS category and treaty article before calculating the Article 81 credit limit.

The return and evidence sequence

A certified accountant first reconciles the Portuguese and foreign records to the tax year. A certified accountant then resolves the residence, classification, treaty and credit questions, and prepares the Model 3 return and annexes from that completed evidence file.

Published by Advisors in Portugal Published: Last reviewed:

Set out your Portuguese tax position

Describe where you lived, which income and assets you hold, where tax was paid and which Portuguese filings already exist.

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Common questions

When am I tax resident in Portugal?
Article 16 of the CIRS treats you as resident when you spend more than 183 days in Portugal in a relevant 12-month period or when you have a dwelling held in conditions that suggest a current intention to maintain and occupy it as a habitual residence. A certified accountant applies both tests to the relevant tax year.
Does a Portuguese tax resident report foreign income?
Article 15 of the CIRS taxes residents on income that includes income obtained outside Portugal, while non-residents are taxed on Portuguese-source income. A certified accountant classifies each income stream and checks any treaty relief.
What are the general Portuguese IRS brackets for 2026?
CIRS Article 68(1), as amended by Article 71 of Lei n.º 73-A/2025 (the 2026 State Budget), sets the 2026 general taxable-income brackets: up to EUR 8,342 at 12.50%; above EUR 8,342 to EUR 12,587 at 15.70%; above EUR 12,587 to EUR 17,838 at 21.20%; above EUR 17,838 to EUR 23,089 at 24.10%; above EUR 23,089 to EUR 29,397 at 31.10%; above EUR 29,397 to EUR 43,090 at 34.90%; above EUR 43,090 to EUR 46,566 at 43.10%; above EUR 46,566 to EUR 86,634 at 44.60%; and above EUR 86,634 at 48.00%. Article 68(2) of the CIRS applies the progressive calculation, and these are taxable-income brackets, not withholding tables or universal rates for every income type.
Can I claim credit for foreign tax paid?
Article 81 of the CIRS allows a credit for international juridical double taxation, limited to the smaller of the foreign income tax paid and the relevant Portuguese IRS amount. A treaty can further cap the deduction at the foreign tax paid under that treaty.
How does a double-tax treaty affect my return?
A certified accountant identifies the residence state, source state, income category, treaty article, taxing rights, relief method and required evidence. AT states that a treaty works with the domestic residence, source and credit rules, so one treaty result cannot be applied across every country or income type.
Who can represent me when a legal issue is raised before AT?
Article 5(2) of the CPPT limits a tax mandate involving legal questions before AT in petitions, complaints or appeals to lawyers, trainee lawyers and solicitors acting under the law.
What can a certified accountant handle?
Article 10(2)(b) of the Estatuto da Ordem dos Contabilistas Certificados allows a registered certified accountant to represent subjects whose accounts they handle in non-contentious tax procedure and process, within their competence, until a lawyer becomes mandatory.
How much does a tax adviser in Portugal cost?
Fees are set case by case. You get a quote in writing before any work starts.
How is Portuguese tax work handled?
A certified accountant prepares the residence, income, foreign-tax-credit and treaty work. Each enquiry receives a reply, and one contact stays with the case.
Does one address determine Portuguese tax residence?
No. Article 16 of the CIRS contains a day-count test and a habitual-residence dwelling test, so a certified accountant reviews the full period and the conditions in which you held and occupied a home.

How the Service Works

  • One team for the whole case.

    One team runs the case and brings in certified accountants and other independent professionals as your tax, investment and cross-border questions require.

  • English or Portuguese.

    English or Portuguese, whichever you are most comfortable in.

  • A quote in writing before work starts.

    You get a quote in writing before any work starts. A case outside the service is flagged plainly.

Contact us

Your request is in

Every request is read in house. The requirements are assessed, and a reply by email sets out the appropriate next steps.

Every enquiry is read in house, and the aim is a reply within one business day.

Describe your Portuguese tax position

Every enquiry starts with the form below. Describe your residence, income, assets, source countries and filing history, and the enquiry is reviewed to confirm what can be prepared, in English or Portuguese.

Describe your residence, income, assets, source countries, prior filings and current questions. Replies are sent within one business day, and the first conversation is free.

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The information on this page is checked against official sources and reviewed regularly. It is corrected when the law or official guidance changes, as the Editorial Standards describe.