Counting your residence years: how time abroad is calculated for naturalisation

Naturalisation abroad is not something you buy. You earn it with time, and that time is counted more strictly than most people expect. For the big picture of the countries and their routes, see the overview Naturalisation abroad. The one question most applications hinge on is this: how do the authorities work out your years?

Why residence years are not calendar years

Your residence permit carries a date. Many people simply add five or ten years to it and assume they can apply then. The authorities see it differently. They distinguish between legal residence, meaning the right to live in the country, and physical presence, meaning the days you were actually there.

In practice you will come across three models, often combined:

• Continuous residence: you must have lived in the country for a set period without a break. Absences that are too long interrupt the period, and the clock starts again.
• A quota of days: you need a minimum number of days in the country within a given window, for example 1,095 days in five years.
• A cap on absences: you may spend no more than a set number of days outside the country, for example 450 days in five years.

Germany, incidentally, counts the same way. Under Section 10 of the German Nationality Act (Staatsangehörigkeitsgesetz, StAG), a foreign national needs five years of lawful habitual residence to naturalise. Section 12b StAG governs interruptions: stays abroad of up to six months do no harm, while for longer ones it depends on whether the immigration office set a deadline for your return. If you know the German system, you already understand the principle. Abroad only the numbers change, and they are often tougher.

The countries at a glance

USA: five years of residence and 30 months of physical presence

The USA checks two things separately, and both have to add up. First, continuous residence: as a green card holder, the general rule is that you must have lived in the USA without interruption for five years before you apply, and that residence must continue until you are naturalised. You must also have lived for three months in the state or district where you file your application.

Second, physical presence: you must actually have been in the country for at least 30 months, which is at least 913 days, within those five years. USCIS counts the day you leave and the day you return as days in the country. And the agency states explicitly that simply holding a green card does not prove presence.

When a trip breaks your residence

This is the real trap. An absence of more than six months but less than a year is treated as a break in residence unless you prove otherwise. USCIS itself lists what you can put forward: that you did not give up your job in the USA or take a new one abroad, that your immediate family stayed in the USA, and that you kept your home in the USA. The list is not exhaustive.

Once you have been away for a year, no evidence helps. Your residence is then broken automatically, unless you obtained an approved Form N-470 beforehand, which preserves residence for certain kinds of work abroad. The full road from green card to passport is described in USA: from green card holder to US citizen.

Canada: 1,095 days in five years

Canada is the clearest day-count model. You need at least 1,095 days of physical presence in the five years before your application. What counts is not how long you have held the status, but how many days you have actually spent in Canada.

There is a bonus for anyone who was in the country on a temporary visa first: every day as a temporary resident or protected person counts as half a day, up to a credit of 365 days. That means at least 730 days must have been spent in the country as a permanent resident. Time in custody, on probation or while waiting for a decision on an asylum claim does not count.

The authority provides a physical presence calculator and itself recommends applying with more than 1,095 days, so that a miscalculation does not sink the application. You enter every single trip into that calculator, which is exactly why you need a proper travel log from day one. More on the Canadian route in Canadian citizenship for Germans.

United Kingdom: how long you have to live in the UK

The United Kingdom counts the other way round: not the days in the country, but the days outside it. To naturalise, you usually need to have lived in the United Kingdom for five years and to have held indefinite leave to remain for twelve months. In those five years you may not have spent more than 450 days outside the country, and no more than 90 days in the last twelve months.

Then there is a rule many people overlook: you must have been physically in the country exactly five years before the day the Home Office receives your application. If you happened to be on holiday on that date, the calculation shifts. Schedule 1 of the British Nationality Act 1981 allows the Home Office to overlook excess absences in special cases. You should not build your plans on that, though. How the application itself works is shown by St Matthew in its article on applying for British citizenship (in German).

Ireland: five years out of nine and 70 days of leeway

Ireland combines two models. You need one year of continuous reckonable residence immediately before the application and a total of four years in the eight years before that. Together, that makes five years out of the last nine.

In the final year you may spend up to 70 days outside Ireland. The day you leave and the day you return do not count as absence. In exceptional cases, for example for health or family reasons, up to 30 further days can be accepted if you explain them in your application.

Not every period in the country counts. Reckonable time includes, for example, years with a work permission (Stamp 1) or Stamp 4. Time on a student permission (Stamp 2 or 2A) generally does not count, nor does time without papers. The whole road to the Irish passport is described by Saol Nua Plan in Irish naturalisation.

Switzerland: ten years and the six-month limit

Switzerland asks for a lot of time, but counts it in a way you can follow. Under Article 9 of the Swiss Citizenship Act (Bürgerrechtsgesetz, BüG), you need a C permit (settlement permit) when you apply and a total of ten years of residence in Switzerland, three of them in the five years before the application. Years between your 8th and 18th birthdays count double, although at least six years must actually have been lived there. For families with school-age children that is a real advantage.

Under Article 33, residence on a B permit or a C permit counts in full, provisional admission only at half value. Short trips with the intention of returning do not interrupt your residence. But if you deregister, or actually live abroad for more than six months, you have given up your residence in Switzerland. A sabbatical spent travelling the world can therefore stop the clock.

On top of that, every canton sets its own minimum period of residence of two to five years. Moving within Switzerland can therefore delay your application, even if you met the ten years long ago. The details are in Switzerland: naturalisation for Germans.

Argentina: two years without leaving the country once

Argentina is known as one of the countries with the shortest waiting period. The flip side: its way of counting is the strictest in this comparison. You must have lived in Argentina continuously and lawfully for the two years before the application, without a single trip out of the country. You must be in the country when the process starts. The legal basis is the Nationality Act, Ley 346, as amended by Decree 366/25. The Cámara Nacional Electoral declared that decree null on 30 June 2026 in the case Yang, Liping; the government's appeal lies with the Corte Suprema, and until it rules, the migration authority applies the strict way of counting.

For entrepreneurs with clients in Europe or family in Germany, that is a real hurdle: one flight to your sister's wedding, and the period starts again. Alongside it, on 2 October 2026 the government presented a second route: a non-refundable contribution of USD 350,000 to the Treasury, or the subscription of a specially created government bond of USD 800,000. According to the government, the programme is due to accept applications in the fourth quarter of 2026; until then the route is announced, not open, and no amount has been published in the Boletín Oficial.

How to prove your residence years

The burden of proof is on you. The USA says so explicitly, and the other countries want to see evidence too. If you only start gathering it when you apply, you lose weeks and sometimes the year of your application. So start on your first day in the new country.

Keep a complete record of your travel

Keep a travel log with departure, return and destination for every single trip, including weekend trips to a neighbouring country. Hold on to boarding passes and booking confirmations, and photograph every stamp in your passport. Also check how your target country counts travel days: in the USA the days of departure and return count as days in the country, while in Ireland they do not count as absence. Canada provides its own calculator.

Prove your life in the country

The authorities want to see that you really live there. Typical evidence includes a tenancy agreement or proof of property ownership, an employment contract and payslips, tax assessments from your target country, bank statements showing day-to-day spending there, school certificates for your children and contracts for electricity, phone and insurance. For the USA, USCIS names exactly these ties as counter-evidence after longer trips: work, family and a home in the country.

Plan backwards

Set the date on which you want to apply and count back from there. That shows you how many travel days you have left in the final year. For the United Kingdom and Ireland in particular the final year is decisive, and an unexpected job abroad can push your application back by months. What follows after you apply, from the language test to the oath of allegiance, is covered in Language, test, oath.

Tax residence and naturalisation: two different calculations

A common mistake: anyone who is tax resident in the new country supposedly has the years for naturalisation automatically. That is not true. The tax office asks about your home, your habitual abode and where your life is really based. The naturalisation authority asks about your residence permit and your days in the country. Both calculations run side by side and often reach different results.

An example: you can have given up your German residence properly and still collect too few days for Canadian naturalisation, because you spend half the year travelling. Conversely, a flat in Germany can keep you tax resident there even though you met the day count in your target country long ago. How tax residence is determined is explained by Wohnsitz Ausland in its articles on the 183-day rule and habitual abode and on moving your main home abroad (both in German).

Good news for Germans: since 27 June 2024 you no longer lose German citizenship when you acquire a foreign one. The former loss provision in Section 25 StAG has been repealed. So you no longer have to choose between your old passport and your new one.

When the years are missing: bridging the wait

Five or ten years is a long time, and during all of it you hold only a permission. A residence permit can be refused, not renewed or revoked. A passport is a right, not a permission. That is exactly why many people pursue both routes in parallel: naturalisation as the free and, in the end, strongest route, and a passport by investment that bridges the wait. Why this is not an either-or is explained in CBI and naturalisation.

With citizenship by investment, residence years hardly matter:

You can compare every programme with its amounts, fees and family rules in the programme comparison, and How it works walks you through an application. If you hold an investment passport today, you travel freely during the wait, collect your days in your target country at your own pace and file for naturalisation when the numbers add up.

Frequently asked questions