The Next Passport
Irish Citizenship by Descent
Research hub for Irish citizenship by descent. Ireland's Foreign Birth Registration (FBR) process allows people with Irish-born parents, grandparents, or further ancestors to claim citizenship — and roughly 30–31 million Americans report Irish ancestry in recent U.S. Census Bureau American Community Survey estimates (the widely quoted 33.3 million figure comes from the Bureau's 2013 ACS release).
Last verified: August 14, 2026 · Maintained by The Next Passport (Warner Creates LLC).
The Next Passport is not affiliated with the Government of Ireland, the Department of Foreign Affairs, or any immigration solicitor. Content is informational only and is not legal advice.
Not sure if you qualify?
Our free eligibility check takes 2 minutes and tells you if you may be eligible for Irish citizenship by descent.
Check your eligibility →How Irish Citizenship by Descent Works
Irish citizenship by descent depends on how far back your Irish-born ancestor is and whether intermediate generations registered on the Foreign Births Register before the next generation was born.
Parent Born in Ireland
If your parent was born anywhere on the island of Ireland, you are automatically an Irish citizen and can apply for an Irish passport directly. The FBR is not required for this path.
Grandparent Born in Ireland
If your grandparent was born in Ireland, you are also entitled to citizenship via FBR. Your parent does NOT need to have registered first — this is the most commonly misunderstood rule. Citizenship is effective from the date of FBR registration, not retroactively from birth.
Great-Grandparent or Further
For claims beyond grandparent, every generation in the chain must have been registered on the FBR before the next generation was born. There is no statutory generational limit, but in practice most chains are broken. Section 16 discretionary naturalization is the fallback for broken chains.
What You'll Need
Irish citizenship by descent applications are handled through the Department of Foreign Affairs' Foreign Birth Registration system. Here is an overview of the process:
Application
Submit your FBR application online at fbr.dfa.ie. After electronic submission, print the completed form, sign it in front of a qualified witness, and mail with all original documents to Dublin.
Fee
€278 for adults (18+), €153 for minors (under 18). Paid online during electronic submission. Non-refundable.
Processing Time
Approximately 12 months as of mid-2026. Times vary — check the DFA website for current estimates.
Witness
A currently practising professional (US Notary Public accepted) who is personally known to you must countersign your form, certify your ID copy, and sign 2 of your 4 photos. The DFA requires a witness “who is personally known to you” and is not a relation — a notary who has never met you does not satisfy this.
Key Dates & Laws
Important legislation and constitutional changes that affect Irish citizenship by descent eligibility.
1935 Act — Foreign Naturalization
Under Section 21 of the 1935 Act, Irish citizens aged 21+ who voluntarily acquired foreign citizenship ceased to be Irish citizens. Section 5(1) of the 1956 Act repealed the 1935 Act with effect from July 17, 1956, and the repeal was not retroactive. This does not affect an ancestor born on the island of Ireland, which is the usual case for Irish-American families: Section 6(1) of the 1956 Act provides that every person born in Ireland is an Irish citizen, without any exclusion for someone who had previously lost citizenship, and Section 7(1) transmits to the next generation from a person who “would if alive have been an Irish citizen.” The Department of Foreign Affairs asks for no naturalization evidence when you register a foreign birth. The rule can still matter for an ancestor who was not born in Ireland — someone who held citizenship by descent or by registration and then took another citizenship between 1935 and 1956 — because Section 6(1) does not reach them. Even then, Section 24 of the 1956Act provides that no person is deemed ever to have lost Irish citizenship under Section 21 of the 1935 Act “merely by operation of the law of another country whereby citizenship of that country is conferred on that person without any voluntary act on his part.”
27th Amendment (January 1, 2005)
Changed Irish birthright citizenship — being born on the island of Ireland no longer automatically confers citizenship unless at least one parent is an Irish/British citizen or legal resident.
Good Friday Agreement (1998)
Guarantees people born in Northern Ireland the right to Irish citizenship if at least one parent is an Irish or British citizen, or is entitled to reside without restriction in Northern Ireland or Ireland, regardless of the 2005 changes.
Application Guides
Detailed guides for specific Irish citizenship by descent scenarios. Each guide covers eligibility requirements, required documents, and step-by-step instructions.
Tools & Calculators
Other Countries We Support
The Next Passport also helps with citizenship by descent for other countries.
Italian Citizenship by Descent
Canadian Citizenship by Descent
German Citizenship by Descent
Polish Citizenship by Descent
Portuguese Citizenship by Descent
Hungarian Citizenship by DescentThe Next Passport is not affiliated with the Government of Ireland, the Department of Foreign Affairs, or any immigration solicitor. Content is informational only and is not legal advice. Verify all details with the official DFA website before submitting documents.