Who qualifies for Finnish citizenship by descent
You are Finnish if your mother was Finnish at your birth, or your father was and paternity is established (children of unmarried Finnish fathers born abroad may need a declaration). Finland passes citizenship only from a parent. The age-22 rule (Nationality Act, section 34) applies only to dual citizens: Finns with no other citizenship keep it regardless.
Boarding pass · free tool
No sign-up · Private
Finland eligibility checker
Answer a few questions about your Finland ancestry. Takes under 2 minutes.
Country
Your answers are processed in your browser — we don’t store them or send them anywhere, including to analytics. The site itself uses analytics and, with your consent, ads. Privacy policy
Finland's age-22 rule applies only to dual citizens — but it applies automatically
If you were born abroad, hold another citizenship as well as Finnish, and haven't lived in Finland (or the Nordic countries) for long enough, your Finnish citizenship ends on your 22nd birthday unless you've done something that shows a link. The qualifying steps are concrete: applying for a Finnish passport or ID card, doing Finnish military or civil service, or sending a written notification that you want to keep your citizenship.
The notification is the simplest option. It has no required format, can be written in Finnish, Swedish or English, and must be received by a Finnish embassy or the Digital and Population Data Services Agency at the latest the day before you turn 22. The Finnish Immigration Service (Migri) sends reminder letters to people at risk when they turn 18 — but don't rely on the letter arriving.
If Finnish is your only citizenship, the rule doesn't apply: Finland won't make you stateless.
Sources: Migri — retaining Finnish citizenship at the age of 22
Who is Finnish by birth
A child is Finnish at birth if the mother is Finnish. A child is also Finnish if the father is Finnish and married to the mother, and in other cases once paternity is legally established. Children born abroad to an unmarried Finnish father may need a declaration to acquire citizenship — have the paternity documents ready.
Finland passes citizenship only from a parent. A Finnish grandparent doesn't give you a claim unless your parent was Finnish when you were born.
Former Finnish citizens can come back by declaration
People who lost Finnish citizenship — for example under the age-22 rule, or by naturalising elsewhere before dual citizenship was allowed in 2003 — can regain it with a citizenship declaration to Migri. It's far simpler than naturalisation, which since 1 October 2024 requires eight years' residence in Finland plus language skills.
After Migri's 2022 fee change a declaration cost €120 online and €160 on paper; fees were revised again from 1 January 2026, so check Migri's current price list before you pay.
Sources: Migri — citizenship declaration for a former Finnish citizen
Step by step for a Finn born abroad
1. Make sure your birth is registered in the Finnish Population Information System — your parents may have done this through the embassy; if not, the Digital and Population Data Services Agency can register it. 2. Apply for a Finnish passport at an embassy (this also counts as a qualifying step before 22). 3. If you're a dual citizen between 18 and 21 and won't have a passport application or service on record, send the written notification that you want to keep Finnish citizenship. 4. For family history, the National Archives of Finland holds church books and emigration records.
Finnish requirements at a glance
- A Finnish parent at your birth — no grandparent route
- Unmarried Finnish father: paternity must be legally established; a declaration may be needed
- Dual citizen born abroad: before 22, have sufficient ties or take a qualifying step (Finnish passport or ID application, military or civil service, or a written notification to a Finnish mission or the Digital and Population Data Services Agency)
- The written notification must be received at the latest the day before you turn 22
- Former Finnish citizens can regain citizenship by declaration
Documents for a Finnish claim
- 1Your birth certificate naming your Finnish parent
- 2Your Finnish parent's passport or extract from the Finnish Population Information System
- 3Registration of your birth in the Finnish population register (through an embassy or the Digital and Population Data Services Agency)
- 4For a declaration as a former citizen: Migri's declaration form, passport and evidence of former Finnish citizenship
Finnish processing times
Registering a child of a Finnish parent and issuing a passport is administrative. Migri publishes processing times for citizenship declarations; the age-22 notification has no format requirements but must be received before your 22nd birthday.
Where Finnish claims go wrong
- Assuming the age-22 rule doesn't apply because you're a citizen by birth — it does, if you're a dual citizen born abroad with few ties
- Missing the qualifying step: a passport or ID application, service, or a notification before 22
- Assuming a Finnish grandparent creates a claim — it doesn't
- Older guides saying naturalisation takes 5 years — since October 2024 it requires 8 years' residence
Official Finnish government sources
Finnish citizenship FAQ
Q1I'm a dual US–Finnish citizen, 19, and have never lived in Finland. What should I do?
Before your 22nd birthday, either apply for a Finnish passport or ID card or send a written notification to a Finnish embassy that you want to keep your citizenship. Either step keeps your Finnish citizenship past 22.
Q2Does the age-22 rule apply if Finnish is my only citizenship?
No. It applies only to people who also hold another citizenship.
Q3Can I get Finnish citizenship through my grandfather?
Not directly. Finnish citizenship passes only from a parent at birth. If your parent is a former Finnish citizen, they may be able to regain it by declaration, but that doesn't make you Finnish retroactively.
Q4I lost Finnish citizenship. Can I get it back?
Usually yes, by a citizenship declaration to Migri, which is much simpler than naturalisation.
Q5How long is naturalisation in Finland?
Since 1 October 2024 the general requirement is 8 years' residence, plus language skills and other conditions.
Q6Who sends the reminder about the age-22 rule?
The Finnish Immigration Service writes to dual citizens at risk when they turn 18 — but you're responsible for acting even if no letter arrives.
Finnish nationality law
Nationality Act (Kansalaisuuslaki 359/2003), in force 1 June 2003, which allowed dual citizenship. Section 34 sets out loss at age 22 for dual citizens without sufficient ties. Since 1 October 2024 naturalisation generally requires 8 years' residence.
Dual citizenship in Finland
Finland has allowed dual citizenship since 1 June 2003. Dual citizens born abroad must keep sufficient ties or take a qualifying step before 22 to keep Finnish citizenship.
Finnish application costs
Registering a child of a Finnish parent: no citizenship fee. The age-22 notification: no fee. A declaration by a former Finnish citizen cost €120 online or €160 on paper after Migri's 2022 fee change — check Migri's current price list, as fees were revised from 1 January 2026.