Portugal tax residency: the 183-day rule

Portugal treats you as a tax resident at 183 days in any rolling 12-month window — but the day count is only the part we can calculate. It is one of Portugal's tests, not the whole rule (see the others below). Source: Autoridade Tributária e Aduaneira, last reviewed 2025-09-01.

183 days isn't the only route — Portugal can also treat you as resident on non-day grounds (available dwelling (habitual home)). See every test below.

Spend 183 days or more in Portugal across any rolling 12-month window — the count does not reset on 1 January — and residency can attach.

Reviewed by Quentin Dupard, founder · last reviewed 2025-09-01 · How we research

Threshold: 183 days
Counting window: 12-month rolling
Day-based test: 1
Last reviewed: 2025-09-01

How does Portugal count days for tax residency?

According to Autoridade Tributária e Aduaneira, you become a tax resident of Portugal once you spend 183 days or more there in any rolling 12-month window. Crucially, this is a rolling window: it does not reset on 1 January. Any qualifying span that contains enough days can trigger residency, so you have to watch a moving window rather than a fixed year.

More than 183 days in any rolling 12-month period

183 days · any rolling 12-month window

Spend 183 days or more in Portugal across any rolling 12-month window — the count does not reset on 1 January — and residency can attach.

Art. 16(1)(a) CIRS: resident if present more than 183 days (whole or partial, including arrival and departure) in ANY 12-month period starting or ending in the year — a rolling window, not the calendar year. Residency then attaches from the first day of presence in that period. The NHR/IFICI regime is separate and depends on registration, not days.

What else makes you a tax resident of Portugal?

The day count is only one route. Portugal can also make you a tax resident through any one of the following — regardless of how few days you spend there. These don't depend on a day count, so Yuravia can't track them for you; weigh them against your own situation.

Available dwelling (habitual home)

Art. 16(1)(b) CIRS: resident if, on any day of the 12-month period, you have a home in Portugal in conditions that suggest you intend to keep and occupy it as your habitual residence — regardless of total days present.

Portugal at a glance

Tax year: 1 January – 31 December (the IRS personal income tax year is the calendar year).
How days are counted: Under Article 16 of the CIRS, a "day of presence" is any day — whole or partial — that includes an overnight stay in Portugal, so arrival and departure days that involve a night spent in the country count as full days. Presence is counted over any 12-month period starting or ending in the fiscal year.
What residency means: Tax residents are taxed on their worldwide income at progressive rates (roughly 12.5%–48% for 2026); non-residents are taxed only on Portuguese-source income. Residency normally begins on the first day of stay and ends on the last day of stay, so partial-year (split-year) residency is possible.
Notable regime: IFICI ("NHR 2.0", Tax Incentive for Scientific Research and Innovation) — replaced the NHR regime for new arrivals from 2024; grants a 20% flat rate on qualifying Portuguese employment/self-employment income and a general exemption on most foreign-source income for 10 years, subject to registration (deadline 15 January of the year after becoming resident) and eligibility.

Official source

Autoridade Tributária e Aduaneira. View the primary guidance ↗

Rule last checked against this source on 2025-09-01.

Count your days in Portugal

The day count is the one test you can actually calculate — the home, family and ties tests above, you can’t. Use a free calculator to see exactly how close you are to Portugal's 183-day threshold — or let Yuravia track it automatically across every country at once and warn you before you cross a line.

183-day calculator Schengen 90/180 calculator

Frequently asked questions

How many days can I stay in Portugal without becoming a tax resident?

According to Autoridade Tributária e Aduaneira, Portugal treats you as a tax resident at 183 days across any rolling 12-month window (the "More than 183 days in any rolling 12-month period"). Staying under that is necessary but not sufficient — a permanent home, family, or your centre of vital interests can make you resident on fewer days.

Is the day count the only way to become a tax resident of Portugal?

No. Beyond the day count, Portugal can treat you as resident through available dwelling (habitual home) — any one of these can apply even if you stay well under 183 days. They don't depend on counting days, so confirm them against your own circumstances.

What counts as a day of presence in Portugal?

In most jurisdictions any day on which you are physically present — including the arrival and departure days — counts as a full day. Treating both as counted is the conservative assumption. Always confirm the exact rule with Autoridade Tributária e Aduaneira.

What is the official source for Portugal's tax-residency rule?

Autoridade Tributária e Aduaneira. The rule on this page was last checked against that source on 2025-09-01. Thresholds and tests change, so confirm before relying on it.

Other countries

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Not tax advice. This page summarises one country's day-count rule from its tax authority. Real residency depends on far more — permanent home, family, economic ties, treaty tie-breakers and intent — and thresholds change. The day count is a proxy, not a verdict. Always confirm with the official source above or a qualified adviser.

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