Does Finland allow dual citizenship with the USA?

Yes. Finland has accepted dual (multiple) citizenship since 1 June 2003, so you can be Finnish and American, Canadian, British or Australian at the same time. A Finn who naturalises abroad keeps Finnish citizenship, and someone who becomes Finnish doesn’t have to give up another one. The catch is the age-22 rule: if you were born abroad, hold another citizenship and have no sufficient connection to Finland, your Finnish citizenship ends on your 22nd birthday. Keeping it usually takes one simple step, taken in time.

The short answer

• Finnish and US citizen from birth, under 22: you can keep both, but make sure you have a qualifying connection to Finland before you turn 22.
• Finn who naturalises in the US (or anywhere) since 1 June 2003: keeps Finnish citizenship.
• Finn who naturalised abroad before 1 June 2003: generally lost Finnish citizenship, but can usually regain it by declaration.
• Grandchild of a Finn: no claim by descent. Finnish citizenship passes only from a parent.

Who the age-22 rule applies to

Section 34 of the Nationality Act affects people who hold Finnish citizenship and the citizenship of another country. If they have no sufficient connection to Finland, Finnish citizenship is lost automatically at 22, without any decision being made. The rule doesn’t apply if:

• Finnish is your only citizenship (Finland won’t make you stateless);
• you were granted Finnish citizenship on application or by declaration, rather than at birth.

In practice the people at risk are children of a Finnish parent who were born in the US, Canada, the UK, Australia or elsewhere, picked up that country’s citizenship at birth, and grew up outside the Nordic countries.

What counts as a sufficient connection

The Finnish Immigration Service (Migri) lists the circumstances that count. Any one of them is enough:

• you were born in Finland and have a municipality of residence in Finland when you turn 22;
• you have lived in Finland or another Nordic country (Denmark, Iceland, Norway or Sweden) for a total of seven years before turning 22;
• you have completed, or are completing, military or non-military service in Finland;
• you applied for, or were issued, a Finnish passport or identity card between the ages of 18 and 21;
• you sent a written notification that you want to keep Finnish citizenship (below).

For most dual citizens abroad, the passport is the easy route: apply for a Finnish passport at an embassy after your 18th birthday and before you turn 22.

The written notification

If you won’t have a passport application or one of the other connections on record, or you aren’t sure, send a notification that you wish to keep your Finnish citizenship. According to Migri:

• it has no set format and can be written in Finnish, Swedish or English;
• it must be received by a Finnish mission abroad (an embassy or consulate general) or the Digital and Population Data Services Agency (DVV) no later than the day before your 22nd birthday;
• a notification sent to an honorary consulate, or to Migri itself, doesn’t count.

The DVV service page says you can send it from age 18. Post it well ahead of time, and keep proof of when it was received.

Migri sends letters to dual citizens turning 18 who have lived in Finland for less than seven years, if their address is in the population register. The letter is a courtesy. The deadline applies whether or not it reaches you.

What descendants claiming by descent need to know

Finland passes citizenship from parent to child at birth. A child is Finnish if the mother is Finnish, or if the father is Finnish and married to the mother, or once paternity is legally established; children born abroad to an unmarried Finnish father may need a declaration. There is no route through a grandparent, so for most descendants the dual-citizenship question comes down to two things:

1. Was your parent still Finnish when you were born? Before 1 June 2003, a Finn who took another citizenship generally lost Finnish citizenship. If your parent naturalised in the US before you were born and before 2003, they were probably no longer Finnish at your birth, and nothing passed to you. A transitional declaration period that followed the 2003 reform ended on 31 May 2008.
2. If you were Finnish at birth, did you keep it at 22? If you were born abroad with another citizenship and did none of the things listed above, you may already have lost it.

The full rules on who is Finnish at birth, registering a birth abroad and passports are in the Finnish citizenship by descent guide.

If you’ve lost Finnish citizenship

Former Finnish citizens, whether they lost citizenship under the age-22 rule or by naturalising abroad before 2003, can usually regain it with a citizenship declaration to Migri. It is much simpler than naturalisation, which since 1 October 2024 generally requires eight years’ residence in Finland plus language skills. Migri’s fees were revised from 1 January 2026, so check its current price list before you pay.

Regaining Finnish citizenship by declaration doesn’t make a child born in the meantime Finnish retroactively. Each family member’s position depends on whether a parent was Finnish at their birth.

The US side

The State Department says US law does not require a US citizen to choose between US citizenship and another nationality. You must use your US passport to enter and leave the United States.

Practical steps

1. Check that your birth is registered in Finland. Your parents may have done it through the embassy; if not, DVV can register it.
2. Mark your 18th and 22nd birthdays. Between them, apply for a Finnish passport or ID card, or send the written notification.
3. Keep evidence. A copy of the passport application or proof that the notification was received will settle any later question.
4. Already over 22 and unsure? Ask a Finnish embassy or Migri whether you are still a citizen before you apply for a passport, and look at the declaration route if you’re not.

To see whether you have a claim at all, use our free citizenship by descent checker. For how Finland compares with its neighbours, see dual citizenship by descent, country by country, and the Nordic guides for Sweden, Norway and Denmark, which all have their own version of the age-22 rule.

Frequently asked questions

Official sources

• Finnish Immigration Service (Migri): Retaining Finnish citizenship at the age of 22 (who is affected, sufficient connection, the notification, where to send it, reminder letters)
• Migri: Loss of citizenship
• Migri: Citizenship declaration for a former Finnish citizen
• Suomi.fi: Notification of retaining Finnish citizenship (Digital and Population Data Services Agency)
• Migri: Deadline for making citizenship declaration 31 May 2008
• US Department of State: Dual nationality

Checked against these sources on 29 October 2026. Migri’s and Finlex’s pages refused automated access that day, so the age-22 rules are as Migri’s own pages state them in search excerpts, cross-checked with our Finland guide, which was checked against migri.fi on 13 October 2026. The State Department page could not be opened either, so its position is as its published wording states it. Only Migri can confirm your status; check with it or a Finnish embassy before your 22nd birthday, and before you rely on any fee.