Partial-Year Residency

Your moving year can contain two tax periods

Partial-year residence can split a calendar year into a resident period and a non-resident period. Under CIRS article 15, the resident period brings worldwide income within Portuguese IRS scope. During the non-resident period, Portuguese-source income remains relevant. This is a scope rule, not a promise that every item is taxed or exempt in a particular way.

The first step is to establish whether partial-year treatment applies and its dates. Your arrival, lease, visa and NIF records are evidence, but no single label replaces the tax-residency tests. An earlier visit, residence in the preceding year or a return after departure can change the answer.

Establish the residence start date

CIRS article 16 contains a presence test of more than 183 days in a qualifying 12-month period and a habitual-home test for shorter stays. For those tests, the general start rule is the first day of the relevant period of presence. It is not simply the day you reach day 184 or the day the tax address is updated.

The article also contains exceptions. In particular, someone resident in Portugal on any day of the previous year can be treated as resident from 1 January when the conditions are met again. Departure and reacquisition rules can also lead to full-year treatment. Check them before describing a return as “only the months after I moved”.

1. Your actual timelineTravel dates, overnight stays and when a home became available.
2. Your registered timelineThe address and effective dates recorded with the tax authority.

AT · CIRS article 16 ↗

1. Write the actual timeline. Include earlier visits, overnight stays, the date a home became available for habitual use and any departure or return.
2. Check the previous and following years where relevant. A rolling presence window crosses calendar years, and article 16 includes rules involving adjacent years.
3. Compare the registered timeline. Check the address and effective dates in your AT record. Resolve inconsistencies using supporting documents; an administrative date is not a free choice of tax status.
4. Check the other country. Its domestic rules may still treat you as resident. If both countries claim residence, examine the applicable treaty rather than assuming the dates meet neatly.

Allocate income only after the dates are settled

Build a worksheet with the income owner, category, source country, relevant dates, gross amount and tax paid. Keep timing and source as separate questions. A bonus for earlier work, deferred compensation or a disposal around the move needs its own analysis; dividing every annual figure by twelve can be wrong.

Worked example: a September start

One year does not always mean one declaration

CIRS article 57(6) says that where a taxpayer has two Portuguese residence statuses in the same year, a declaration is submitted for each status, subject to the general possibility of exemption. A resident-period return therefore does not automatically cover every non-resident-period obligation.

Check any exemption under article 58 separately. If only the resident period requires a return, retain the reasoning and supporting records for that conclusion. If both require filing, distinguish the periods and income scopes in the applicable forms.

The first Modelo 3 guide explains the main form and submission steps. The Anexo J guide covers foreign-source income and accounts; it is not a catch-all for everything connected to your former country.

The evidence bundle for a moving year

• A dated travel and overnight-stay record, including earlier visits.
• Lease or ownership documents and evidence of actual habitual-home use.
• AT registration details, effective dates and any correction correspondence.
• Income statements and transaction dates covering both sides of the move, not only the months you expect to declare.
• Work-location records for cross-border employment or services.
• Foreign residence certificates, tax statements and the relevant treaty where dual residence or double taxation is in question.
• Evidence of any special-regime eligibility and applicable application deadlines, checked separately from the return deadline.

For the move itself, use the just-arrived checklist to track your first administrative steps. If your timeline includes a departure, the leaving-Portugal checklist helps you gather the records to review.

The printable first-filing checklist turns these decisions into a practical preparation list. Keep the documents yourself; the checklist does not collect them.

Prepare for 2027 without assuming its final calendar

For 2026 income, the ordinary window under current article 60 is 1 April to 30 June 2027. This guide was checked on 15 September 2026. Confirm the 2027 campaign forms, preparation deadlines and any changes when AT publishes them.

Article 60 also provides a conditional extension for qualifying foreign tax not yet determined, with communication to AT required during the ordinary window. Moving abroad or waiting for a statement does not automatically qualify. Other countries’ returns and any regime registration follow their own rules and timelines.

Common questions

General information, not personalised tax advice. Your facts and the rules for the relevant income year govern. Check uncertain classifications before filing.