How to Become a Tax Resident in Portugal
By Taxpert Editorial · Last reviewed: 26 April 2026
Becoming a Portuguese tax resident triggers worldwide income taxation in Portugal — and opens the door to special regimes like IFICI. This guide explains the tests, the registration process, and what to do in your first year.
The two residency tests
Primary test: 183-day rule
Spend 183 or more days in Portugal in a calendar year — partial days count as full days. Days need not be consecutive. Art. 16(1)(a) CIRS.
Secondary test: habitual residence
Maintain a home in Portugal on 31 December of the year, in conditions indicating your intention to use it as your usual abode — even with fewer than 183 days. Art. 16(1)(b) CIRS.
Step-by-step: establishing residency
- 1.
Get a NIF
Your Portuguese tax identification number. Required for all financial activities. Obtain at any AT (Finanças) office. EU citizens need passport/ID; non-EU citizens typically need a fiscal representative initially.
- 2.
Arrange your Portuguese address
Rent or buy property. You'll need a rental contract or property deed as proof of address. Short-term Airbnb stays don't establish a habitual residence for tax purposes.
- 3.
Register your address with AT
Update your NIF record with your Portuguese address via Portal das Finanças or in person at an AT office. This is your official tax residence registration. AT will use this address for all tax communications.
- 4.
Apply for IFICI (if applicable)
If you have qualifying employment or self-employment income, apply for IFICI certification via Portal das Finanças before your first Modelo 3 filing.
- 5.
Exit your previous country's tax system
Formally deregister as a tax resident in your previous country — notify their tax authority, update banking records, and ensure you have documentation of your departure date.
- 6.
File your first Modelo 3
In April–June following your first year of Portuguese residency. Declare all worldwide income received during that year. AT pre-fills some data from Portuguese sources — verify everything and add foreign income.
What residency means for your taxes
- Worldwide income: As a Portuguese tax resident, your entire worldwide income — salaries from abroad, foreign pensions, dividends from foreign stocks, rental income from overseas property — is subject to Portuguese IRS.
- Double taxation relief: Foreign taxes paid on income also taxed in Portugal are creditable via the Foreign Tax Credit mechanism — either under a DTT or unilaterally under Art. 81 CIRS.
- Regime access: Portuguese tax residency is a prerequisite for IFICI, IRS Jovem, and NHR Legacy (now closed). You cannot access these regimes as a non-resident.
- Municipal IRS credit: Your registered municipality's IRS participation rate applies to your annual IRS return — potentially worth hundreds of euros per year depending on the municipality.
Frequently asked questions
How many days must I spend in Portugal to become a tax resident?
183 days or more in any 12-month period beginning or ending in the tax year. Partial days count as full days. There is also a secondary habitual residence test — if you maintain a home in Portugal on 31 December, you can be deemed a tax resident even with fewer than 183 days.
When does Portuguese tax residency start?
Portuguese tax residency starts from the first day of the tax year (1 January) in which you meet the residency criteria — unless you can demonstrate you were not resident for part of that year. Portugal does not have a formal split-year treatment, unlike the UK. In practice, AT treats you as resident for the entire year in which you first meet the 183-day rule.
Can I be a tax resident in two countries at once?
Yes — dual residency can occur when two countries both claim you as a resident. Double Taxation Treaties contain tie-breaker rules (permanent home, center of vital interests, habitual abode, nationality) to determine which country has primary taxing rights. Without a treaty, both countries may tax your worldwide income without coordination.
How do I formally exit Portuguese tax residency?
Update your address with AT to a non-Portuguese address via Portal das Finanças. File a final Modelo 3 for your last year of residency. Inform your employer and any Portuguese payers of your change in status. Note: simply moving out is not enough — you must formally update your AT records and stop meeting the 183-day or habitual residence tests.
Related
Calculate your first-year IRS
Use the calculator to estimate your Portuguese IRS for your first year of residency — enter your income sources, select a regime, and see the full breakdown.