Approximately 36 million Americans claim Irish ancestry — more than seven times the population of Ireland itself. A significant share of those 36 million have a grandparent or parent born in Ireland who qualifies them for Irish citizenship and an EU passport. Most have never started the process.
This guide covers the US-specific elements of an Irish citizenship claim: where to actually apply now that the process has moved online, how American documents are handled in the Irish system, what dual citizenship means for US citizens, and the tax picture.
Where to Actually Apply
This used to be the hard part for Americans: which of Ireland’s US consulates (Washington DC, New York, Boston, Chicago, San Francisco, or the Atlanta honorary consulate) covered your state, and how long that specific office’s appointment queue ran. That’s no longer how it works. Foreign Births Register applications are now filed entirely online at fbr.dfa.ie and processed centrally by the FBR office in Dublin â there’s no consulate appointment to book, and it doesn’t matter which US state you live in. You still need a currently practicing professional who personally knows you (not a relative) to witness the application and certify your documents, but that person doesn’t have to be consulate staff.
Once your registration is approved, the passport application itself goes through Passport Online (passportonline.dfa.ie), which now handles first-time applications from anywhere in the US â again, no regional consulate assignment involved. Ireland’s US consulates are still useful for other consular matters, but for the FBR-to-passport path specifically, you’re dealing with Dublin directly.
How American Documents Work in the Irish System
US-issued birth and marriage certificates are accepted by Irish consulates with apostilles in many cases, but requirements vary by consulate. Confirm with the specific consulate before ordering apostilles.
US birth certificates: You need a full certified copy from the vital records office of the state where you were born — not a card-format birth certificate or a commemorative certificate. The full certificate shows parents’ names, place of birth, and other required fields. Request this from the state registrar or county clerk’s office.
US marriage certificates: Full certified copies from the county clerk or state vital records office where the marriage was registered.
Apostilles for US documents: US apostilles are issued by the Secretary of State’s office of the state that issued the document (for state documents) or by the US Department of State (for federal documents). Processing times vary by state — some offer expedited services through third-party providers.
Irish documents: Irish GRO certificates (your grandparent’s Irish birth certificate) do not need apostilles — they are Irish government documents accepted directly.
The 36 Million and the Great Famine Connection
The bulk of Irish emigration to the United States occurred in two main waves: the Great Famine (1845–1852) and the decades of economic emigration that followed through the early 20th century. A third wave came in the 1980s during Ireland’s economic difficulties.
For Americans whose Irish ancestors came during the Famine or shortly after, the birth records of the Irish-born ancestor can be difficult to locate. Civil registration in Ireland began in 1864 — which means Famine-era births are in church records, not civil records. Many of these have been digitized and are searchable online through IrishGenealogy.ie and the National Library of Ireland, but gaps exist.
If your Irish-born ancestor was born before 1864, you will likely need church baptismal records. The relevant parish must be identified based on the county and townland of origin, which may require some genealogical research if the family emigrated without detailed records.
Genealogy Resources for Irish-Americans
The following are the most useful resources for tracing Irish ancestry:
- IrishGenealogy.ie — Free index search for Irish civil registration records (births 1864+, marriages 1845+, deaths 1864+) and some digitized church records; certificates can be ordered online
- National Library of Ireland (nli.ie) — Digitized Catholic parish registers, searchable for free
- Ancestry.com — Large collection of Irish emigration records, US census records linking Irish-born ancestors to their American descendants, and Irish civil registration indexes
- FindMyPast.com — Strong Irish collection including Griffith’s Valuation (1847–1864), Tithe Applotment Books, and various county records
- GRONI (General Register Office Northern Ireland) — For ancestors from Northern Ireland; civil registration records held separately from the Republic’s GRO
Dual Citizenship: What It Means for US Citizens
The United States does not prohibit its citizens from holding foreign citizenship. Acquiring Irish citizenship does not affect your US citizenship in any way — you keep both passports.
Ireland does not require you to renounce your US citizenship. Irish law recognizes dual nationality.
As a practical matter: US law requires US citizens to use their US passport when entering and leaving the United States. For all other international travel, you can use whichever passport is more convenient or provides better access — typically the Irish passport for EU entry, UK entry, and travel to countries where Ireland’s visa-free access is stronger.
There is no requirement to notify the US government that you have acquired Irish citizenship.
US Tax Implications
Acquiring Irish citizenship changes nothing about your US tax obligations. The United States taxes its citizens on worldwide income regardless of where they live or what other citizenships they hold.
The Irish passport does not exempt you from US filing requirements, FBAR reporting, or FATCA obligations. These follow your US citizenship, not your country of residence or additional citizenships.
If you physically move to Ireland and become an Irish tax resident (183+ days per year in Ireland or maintaining your primary home there), you will become subject to Irish income tax while also continuing to have US filing obligations. The US–Ireland tax treaty provides coordination mechanisms to reduce double taxation, but the details depend on your income type and structure.
Citizenship alone — without a change in residence — is entirely tax-neutral.
Why Americans Pursue the Irish Passport
Beyond the genealogical and cultural connection, the Irish passport offers Americans several practical advantages:
- EU access: Right to live, work, and study anywhere in the EU and EEA — 27 countries — without a visa or work permit
- UK access: Ireland’s Common Travel Area with the UK means Irish citizens can live and work in the UK regardless of Brexit — something no other EU passport provides
- Travel flexibility: Visa-free to 187+ countries; the Irish passport opens some doors that the US passport does not, particularly in countries with complicated US–origin visa requirements
- Risk diversification: A second passport from a stable EU democracy provides optionality that Americans with a single citizenship do not have
- Legacy: Once you hold Irish citizenship, you can pass it to your children — your children can register in the FBR, and their children after them
Related Articles
- Irish Citizenship by Descent: Complete Guide
- Do I Qualify?
- Document Checklist
- Timeline and Backlog Guide
- Spain vs Italy vs Ireland Comparison
- Registering Your Child on the FBR
Use our Citizenship by Descent Checker to verify your eligibility instantly — select your ancestry and see your documents, timeline, and next steps in seconds.
Frequently Asked Questions
Can an American claim Irish citizenship by descent?
Potentially. Eligibility depends on the Irish-born ancestor, the parent’s registration history, and whether the relevant birth or registration occurred before the next generation was born.
Do Irish-American applicants need to live in Ireland?
The Foreign Births Register route does not generally require residence in Ireland, but applicants must prove the qualifying family chain with civil records.
Ready to take the next step? Book a consultation call — we’ll map out the right path for your situation.
