Portugal — Tax Residency (183 Days in Any 12 Months)

Summary

Day threshold

More than 183 days

Window

Any 12-month period starting or ending in the year

Triggers on

Day 184 — track a 183-day cap

Day definition

Any day including an overnight stay

Also triggers

A home suggesting habitual residence (no day count)

Residency starts

First day of the qualifying stay (split year)

Basis

CIRS, Artigo 16.º (1)(a), (1)(b), (2), (3)

Authority

Autoridade Tributária

You become a Portuguese tax resident once you have spent more than 183 days — consecutive or not — in any 12-month period that starts or ends in the tax year. Because the statute triggers at 184, the last safe count is 183: that is the cap Bounded tracks, so the alarm fires on the exact day residency attaches. A second, day-free limb catches anyone who keeps a home in Portugal in conditions suggesting habitual residence. Residents are taxed on worldwide income, so the line is a real financial one.

Who it applies to

This matters most if you are:

• A remote worker or founder splitting the year between Lisbon or the Algarve and somewhere else.
• A D7, D8 or Golden Visa holder who wants the permit without picking up worldwide tax residency.
• A retiree wintering in Portugal whose stays straddle 31 December.
• Anyone who keeps an apartment or a long lease in Portugal while spending most of the year abroad.

It applies to individuals of any nationality. Note that the second limb catches people with very few Portuguese days: a home held in conditions that suggest you mean to live in it can make you resident without the count ever reaching 183.

The rule — and why it exists

Article 16 of the Código do IRS (CIRS) sets out when an individual is resident in Portugal. Two limbs matter for day counting:

• 16(1)(a) — the day test. Residents are those who “hajam nele permanecido mais de 183 dias, seguidos ou interpolados, em qualquer período de 12 meses com início ou fim no ano em causa” — stayed more than 183 days, consecutive or interpolated, in any 12-month period beginning or ending in the year in question.
• 16(1)(b) — the home test. Someone who stayed for less time is still resident if, on any day of that period, they have “habitação em condições que façam supor intenção atual de a manter e ocupar como residência habitual” — accommodation held in conditions implying a current intention to keep and occupy it as a habitual residence. No day count applies to this limb at all.

Article 16(2) defines the unit being counted: “considera-se como dia de presença em território português qualquer dia, completo ou parcial, que inclua dormida no mesmo” — a day of presence is any day, whole or partial, that includes a night spent in Portugal. Article 16(3) fixes the start date: a person who meets the test is resident “desde o primeiro dia do período de permanência em território português”.

Why it exists: Portugal reformed this article in 2015 precisely to close the New Year gap. A calendar-year test lets someone spend five months either side of 31 December and never be resident anywhere. The “any 12-month period” formulation makes every window count, and the overnight definition stops arguments about airport transits and day trips from the Spanish border.

Counting the days

1. 1A day counts only if it includes a night spent in Portugal — a day trip with no overnight stay is not a presence day under Article 16(2).
2. 2Days need not be consecutive; every qualifying day in the window aggregates into one total.
3. 3The window is any 12-month period that begins or ends in the tax year, so days either side of 31 December combine. Bounded approximates "12 months" as 365 days and checks every rolling window.
4. 4Residency attaches once the total exceeds 183 — day 184. Bounded's cap of 183 means the alarm fires on exactly that day.
5. 5If you cross the line, you are treated as resident from the first day of that stay, not from the day you crossed it.

Bounded counts every day you were physically in the country, including days with no overnight stay, so the app can sit slightly ahead of the figure the Autoridade Tributária would compute. That is deliberate: for a rule you are trying to stay under, a counter that warns a day early is safer than one that warns a day late. If you are running close to the line, redo the overnight arithmetic by hand and keep accommodation records.

Examples

Example 1 — the clean count

Marta spends 150 days in Porto across the year in three blocks, staying in hotels, with the rest of her time in Brazil. She owns nothing in Portugal and rents nothing long-term. No 12-month window holds more than 183 days and no home limb applies, so she is not resident.

Example 2 — the New Year split that does not work

Tom spends 120 days in the Algarve from September to December, goes home for a fortnight, then returns for 100 days from mid-January. Neither calendar year alone reaches 183 — but the 12-month window running from September holds 220 days. He is resident, from the first day of that September stay.

Example 3 — resident on 90 days

Sofia signs a three-year lease on a Lisbon flat, keeps her clothes and car there, and visits for 90 days a year. The day limb never fires, but the flat is held in conditions suggesting she intends to keep and occupy it as her habitual residence. Article 16(1)(b) makes her resident regardless of the count.

Exceptions & edge cases

• Crew and public servants. Members of the crew of ships or aircraft operated by entities with residence or effective management in Portugal, and people performing Portuguese public functions abroad, are resident under Article 16 regardless of days.
• Split-year residency. Article 16(3) makes you resident from the first day of the qualifying stay and, symmetrically, non-resident from the day after you leave when you break residence. That is a different mechanic from countries that make you resident for the whole year retroactively.
• The overnight definition cuts both ways. It is generous on day trips but unforgiving on arrivals: land at 23:30 and sleep in Lisbon and you have spent a full presence day.
• Household residency. Portugal historically attributed residency within a household; the modern rules assess individuals separately, but a resident spouse remains a strong factual indicator under the home limb. Take advice if your family lives in Portugal and you do not.
• Treaty tie-breakers. If you are resident in Portugal and elsewhere in the same period, the relevant double-tax treaty decides which residence prevails — permanent home first, then centre of vital interests. That analysis sits outside any day counter.
• Leap years. Bounded approximates a 12-month period as 365 days. A window that spans 29 February is one day longer than that, so in one narrow edge case the counter can read one day light at the very end of the window. Treat reaching the cap as being at the line.

Common misconceptions

• "183 days makes me resident." No — the statute says more than 183. Day 183 is safe; day 184 is the trigger.
• "It resets on 1 January." It does not. Since 2015 the test runs over any 12-month period starting or ending in the year, so a stay straddling New Year is counted as one block.
• "Under 183 days means no Portuguese tax residency." Only if the home limb also fails. A flat held as a habitual residence makes you resident on any number of days.
• "Day trips count against me." Not under the statute — a presence day needs an overnight stay. Bounded counts them anyway, so read the app as an early warning rather than a ceiling to fill.
• "Becoming resident taxes my whole year." No — Article 16(3) starts residency on the first day of the qualifying stay.

Related: if your goal is the opposite — reaching 183 days to establish Portuguese residency for a preferential regime — see Portugal NHR (183-day tax residency). For the permit side, see Portugal residence permit absence limits.

Frequently asked questions

Sources

• Autoridade Tributária e Aduaneira — Código do IRS, Artigo 16.º (Residência)
• Portal das Finanças — Informação fiscal (códigos tributários)