Guide · Irish citizenship by descent
Irish citizenship by descent, explained without the legal jargon.
A plain-language overview of who qualifies for Irish citizenship through a parent or grandparent, how the Foreign Births Register works, and where citizenship fits into a broader US-to-Ireland move. Nothing on this page is legal advice.
This page is an educational overview. It is not legal or immigration advice. Eligibility rules and evidence requirements change — always take written advice from qualified Irish legal counsel before acting.
Eligibility
Four routes, one common test.
Irish citizenship by descent hinges on where in the family tree the Irish-born ancestor sits — and, for later generations, on whether the intermediate parent registered on the Foreign Births Register before the applicant's date of birth.
Parent born in Ireland
If either of your parents was born on the island of Ireland, you are an Irish citizen from birth. No FBR entry is required. You can apply directly for an Irish passport with the appropriate civil documents.
Grandparent born in Ireland
You are entitled to become an Irish citizen through a grandparent born on the island of Ireland, but you must first register in the Foreign Births Register. Citizenship (and passport eligibility) begins from the date of that registration.
Great-grandparent born in Ireland
Not automatic. Citizenship passes only if your Irish-descended parent themselves registered on the FBR before you were born. This is where most multi-generational family research succeeds or stalls.
Parent naturalised as Irish before your birth
Citizenship can pass through a parent who became an Irish citizen (including via FBR) before you were born. As above, timing of the parent's registration relative to your date of birth is decisive.
The Foreign Births Register
What the FBR actually is.
The Foreign Births Register (FBR) is the mechanism through which citizenship passes to the next generation of Irish descendants born abroad. Registration is administered by the Department of Foreign Affairs.
The single most consequential detail: your citizenship (and passport eligibility) begins on the date your FBR entry is made — not from birth. And to pass Irish citizenship to any child born after you, your own FBR registration must pre-date that child's date of birth.
The step-by-step process — where to apply, what documents are accepted, how consular authentication works — is covered in the dedicated FBR walkthrough.
Planning a US-to-Ireland move
Coordinate citizenship, visa and tax as one workstream, not three.
Evidence you will typically need
Documents to gather early.
- Long-form birth certificates for you, the Irish-born ancestor, and every generation in between.
- Marriage certificates showing any name changes across generations.
- Death certificates for deceased ancestors in the chain, where relevant.
- Government-issued photo ID and proof of current address for the applicant.
- Where a parent's FBR entry is being relied on, evidence of the date of that entry relative to the applicant's date of birth.
Long-form (not short-form) certificates are usually required, and civil documents from certain jurisdictions may need an apostille. Your solicitor will confirm the exact evidence pack for your specific chain.
Honest boundaries
What SettleDone does — and does not — do on citizenship.
We do
Coordinate document gathering and family research across generations and countries.
We do not
Advise on your eligibility — that is the work of qualified Irish legal counsel.
We do
Introduce independent Irish solicitors who prepare and review FBR applications.
We do not
Submit legal filings or represent you before Irish authorities.
We do
Sequence the citizenship workstream against the rest of your move (visa, tax, housing, schools).
We do not
Guarantee any outcome — decisions rest with the Department of Foreign Affairs.
Ways to work with us
Coordinate your citizenship and move together
From a first orientation call to a fully managed US-to-Ireland move.
Discovery Call
Complimentary 30-minute fit and scoping conversation. No obligation to proceed.
Explore Discovery CallRelocation & Expansion Blueprint
Standalone written blueprint mapping sequencing, dependencies and provider requirements for a relocation and/or expansion.
Explore Relocation & Expansion BlueprintPersonal Relocation
Coordinated managed programme for an individual relocating to a supported destination.
Explore Personal RelocationFamily Relocation
Coordinated managed programme for a household relocating to a supported destination.
Explore Family Relocation
Common questions
Irish citizenship by descent — frequently asked.
- In broad terms, a person born outside Ireland is automatically an Irish citizen if at least one parent was born on the island of Ireland. If citizenship comes through a grandparent — or through a parent who acquired Irish citizenship but was not born in Ireland — you generally need to register in the Foreign Births Register (FBR) before you are recognised as an Irish citizen. Rules and evidence requirements change; always confirm your specific position with qualified Irish legal counsel.
Next step
Bring your citizenship question into the wider plan.
A complimentary 30-minute Discovery Call. No obligation. A clear recommendation of the right next step.