You may be entitled to an Irish passport without knowing it.
One Irish grandparent can be enough. We explain the Foreign Births Register, the certificates and the deciding question: when your own registration also counts for your children.
Three lines, three situations
The first question is about your line, because everything else hangs on it. If one of your parents was born on the island of Ireland, you are already an Irish citizen and apply straight for the passport. If a grandparent was born there, you become a citizen only by being entered in the Foreign Births Register, which the Department of Foreign Affairs keeps.
| Your line | How it arises | What you do |
|---|---|---|
| Parent born in Ireland | automatically at your birth | Apply for the passport. It only documents what already holds. |
| Grandparent born in Ireland | only on entry in the Foreign Births Register | Apply for registration. |
| Great-grandparent born in Ireland | only if your parent was registered before you were born | otherwise not possible. |
The island of Ireland includes Northern Ireland; a grandparent born in Belfast is enough.
Source: Citizens Information, "The Foreign Births Register"; applications through the Department of Foreign Affairs. As of: retrieved 22 August 2026.
You can also register if one of your parents was already an Irish citizen when you were born without having been born in Ireland, for instance because that parent had been registered or naturalised beforehand. This is exactly how the chain arises by which a family passes citizenship on over generations, and exactly where the deadline in the next section comes from.
Registration takes effect from its own date
If each generation registers their birth before the next generation is born, then Irish citizenship can be passed from parent to child.
If you are entitled to register, your Irish citizenship is effective from the date of registration, not from the date when you were born.
Citizens Information, Foreign Births Register
Citizenship arises on the day of registration, not backdated to birth. A child born before your registration cannot derive anything from you, because you were not yet an Irish citizen when it was born. The department says so without hedging: if you are not yet on the register when your child is born, your child has no claim through this line.
Processing currently takes around12 months, strictly in order of receipt, as of August 2026. Until mid 2025 the department still gave9 months, so the queue has grown longer. If you are expecting a child, you can contact the department's customer service: expectant parents whose child would otherwise lose the entitlement are given priority. Nobody who still has time to solve it another way should count on that.
From application to registration
The application is made online; there is no paper form. The order is old-fashioned all the same: first gather every certificate, then fill in the online form and pay the fee, then print the form, sign it in front of a witness and post it with the original documents. Incomplete applications are sent back unexamined. There is no counter where you could hand anything in; registered post is the recommended route, and there is no acknowledgement of receipt.
The witness must know you personally, must not be related to you and must be actively practising their profession. The list of accepted professions is long and easy enough to meet in practice, in Britain, the Netherlands or Scandinavia too: among them doctors, teachers and head teachers, members of the clergy, solicitors and notaries, pharmacists, accountants, bank managers, police officers and elected representatives. The same person witnesses the form, signs two of your 4 photographs and certifies the copy of your identity document.
Brothers and sisters living in the same country can apply together and share the original certificates of the Irish line. All originals come back by registered post once the application has been dealt with. If a complete application is refused, a written appeal remains possible within6 weeks.
The certificates, generation by generation
For the grandparent line you document three generations, and the same pattern applies to each. For yourself: the witnessed form, the original long-form birth certificate showing your parents, if your name has changed the marriage or change-of-name certificate, the certified copy of your identity document, two original proofs of address and 4 colour photographs, of which2 are witnessed. For the Irish parent and for the Irish-born grandparent: in each case the original birth certificate showing the parents, the marriage certificate where relevant, and a certified copy of an identity document or, for those who have died, the original death certificate.
Short certificates without the parents' details are not enough, because the parents' details are what link the generations. Certificates from Britain, the Netherlands or the Nordic countries go in as state-issued originals. A British certificate is already in English. Whether a Dutch, Belgian or Scandinavian one needs an apostille or a certified English translation, the department's guidance does not say; it only sets out who may certify a copy or a translation. That is unproven, not disproven. When in doubt we submit with a translation, and the individual case settles it for certain.
If the grandparent's Irish certificate is missing, very little is officially regulated. For those born before 1864, that is before Irish civil registration began, the department accepts the baptismal certificate. For adopted Irish-born ancestors the adoption certificate of the central authority is added. For records that cannot be found or are damaged in between, there is no published rule; such cases go through a register search in Ireland and need time that comes before the application.
Fees, certificate and the first passport
| Who | Fee |
|---|---|
| Aged 18 and over | €278 |
| Under 18 | €153 |
Included are €8 for postage, the certificate and the return of your documents.
Source: ireland.ie (Department of Foreign Affairs), "Registering a Foreign Birth" with its FAQ and terms; the earlier nine-month figure from Wayback snapshots of the same page (30 Nov 2023, 25 Jun 2024, 4 Jun 2025). As of: retrieved 22 August 2026.
Registration ends with the Foreign Birth Registration Certificate, and with it the passport application begins. The two run one after the other, not at the same time. You apply for your first Irish passport from abroad online; by post you add the witnessed identity form, the FBR certificate as an original or a certified colour copy, the long-form birth certificate, one proof of address and one proof of name, each with an English translation where needed, and your photo identification.
| What | Value |
|---|---|
| First online application, adults and children | 20 working days from complete receipt |
| Ten-year passport | €75 |
| Child's passport, five years | €20 |
| Postage when living outside Ireland | €15 |
Source: ireland.ie, Passport Online, Turnaround Times, Passport Fees and Documentary Requirements (first adult application, Foreign Birth Registration case). As of: retrieved 22 August 2026.
Children and the order of things
Children born after your registration can be registered through you; children born before it cannot. For a family, that means the order of the registrations helps decide which children can have the passport. If you are going through the grandparent line and planning children, register first, and build the 12 months of processing into that sum.
An application for a minor needs the same documents, plus those of the parent or guardian applying. As the child's proof of address, a letter on headed paper from the school or the family doctor is enough; the adult applying adds their own proofs of address, their own certified copy of identity and their own photographs. What the date of registration means for brothers and sisters, grandchildren and the wider family is set out in detail on the page aboutchildren and the Irish passport.
Something particular applies to Dutch citizens
The two lines above are not equal in law. With a parent born in Ireland, citizenship arises automatically at birth, without any application. With the grandparent line it arises through registration, and registration is made on application.
For dual citizenship this difference is the deciding point in the Netherlands, and for FBR registration it is not settled.Dutch law takes Dutch nationality from an adult who voluntarily acquires another one. Whether an entry in the Foreign Births Register counts as voluntary acquisition, we do not answer on a hunch; for Dutch citizens the rule until it is clarified in writing is: clarify first, then register. British, Belgian, Swedish, Finnish, Danish and Norwegian citizens keep their citizenship either way. The law of each country is set out on its own on the page aboutdual citizenship.
The first step is a conversation
An hour with Sebastian in which your line is checked: the certificates, the order and the deadline that is running for your family.