Guide
Irish citizenship by descent: the Foreign Births Register
Updated
Ireland runs the most generous mainstream descent route in Europe: a single grandparent born anywhere on the island of Ireland makes you eligible. The mechanics reward those who register early.
Who qualifies through which generation
- Parent born on the island of Ireland
- You are an Irish citizen automatically. Apply straight for a passport; no registration needed.
- Grandparent born on the island of Ireland
- Eligible to register in the Foreign Births Register. Citizenship takes effect on registration.
- Parent who is an Irish citizen through the FBR
- Eligible only if your parent registered before you were born. Registration timing is the whole game for later generations.
- Great-grandparent, no FBR link between
- Generally not eligible unless the intermediate generation registered before your birth.
The application in practice
- Where: online through the Department of Foreign Affairs, with original documents posted after (ireland.ie).
- Documents: civil birth and marriage certificates linking three generations, the Irish-born ancestor's birth certificate, and certified identity documents for you and the Irish line; church records alone are not enough for post-1864 births.
- Fee: EUR 278 for an adult (EUR 270 registration and certificate plus a EUR 8 non-refundable postage and handling fee) and EUR 153 for under-18s (EUR 145 plus EUR 8), paid online with the application.
- Timing: processing commonly runs months, and historically stretched past a year in busy periods, apply well before any deadline of your own such as a planned move or a child's birth.
- Northern Ireland counts: birth anywhere on the island of Ireland qualifies, a point the Good Friday Agreement entrenches.
The rule that catches families out
FBR citizenship is not retroactive. It exists from the date of registration, so a child born before their parent registered cannot claim through that parent's registration. The practical advice writes itself: if you are eligible and may have children abroad, register first. This page is general information, not legal advice; confirm the current rules with the Department of Foreign Affairs or an Irish citizenship adviser.
Fee and eligibility figures were read from the Department of Foreign Affairs Foreign Birth Registration page on this page's updated date: ireland.ie. Processing times are the Department's published position and change; check before relying on them.