The Foreign Births Register does not record that you are an Irish citizen. It is the thing that makes you one, on the day of the entry and not before, and the date it carries is the only date your children’s claim will ever turn on.
Everything else about the register — the form, the certificates, the fee, the wait — is administration. This is the part that is law, and the part that is irreversible.
What the Foreign Births Register is, in the statute
Section 27 of the Irish Nationality and Citizenship Act 1956 keeps two records, not one. Checked on 26 September 2026 against the revised text of the Act, updated to 12 June 2026 by the Law Reform Commission.
- A foreign births entry book, kept “at such Irish diplomatic missions and consular offices as the Minister for Foreign Affairs may, from time to time, specify in regulations” (section 27(1)).
- The foreign births register itself, kept “in the Department of Foreign Affairs in Dublin” (section 27(1A)).
Section 27(2) says whose birth may go into either of them: the birth outside the island of Ireland “of a person deriving citizenship through a father or mother so born” — so born meaning also born outside the island. The choice between the book and the register is “at the option of the person registering the birth,” and section 27(3) transmits the particulars from the book to the register in Dublin anyway.
Two things follow from that wording. If your qualifying parent was born in Ireland, you are not a section 27 case at all: you are already a citizen from birth under section 7(1), and the register is not for you. And the forms, the evidence and the fees are not in the Act — section 27(5) empowers the Minister to make regulations covering “the form and manner of keeping” the records, the registration of births in them, and “the fees (if any) to be charged.” That is why every figure on this subject carries a date and none of them are here.
Why the date of the entry is the only date that matters
Section 7(3) lets a person born abroad to a parent also born abroad become a citizen by registration, and then adds the proviso that decides everything downstream:
Provided that the Irish citizenship of a person who, after 1 July, 1986, is registered under section 27 shall commence only as on and from the date of such registration.
Read that against section 7(1), which makes a person a citizen from birth “if at the time of his or her birth either parent was an Irish citizen.” The two together produce one rule with no discretion in it anywhere:
A child born to you before your entry in the register had no Irish citizen parent at the time of their birth. Not a late claim, not a harder claim — no claim. Your entry, whenever it comes, does not reach backwards to a birth that has already happened.
What changed on 1 July 1986
The proviso names a date, which means the rule before it was different. Registration made after 1 July 1986 starts your citizenship on the day of the entry. A registration made before that date did not carry the proviso, so an older entry in the register can sit behind a line that would fail the timing test today.
This matters in exactly one practical way, and it is worth an afternoon in the family’s papers: if a parent or grandparent of yours was registered in the 1970s or early 1980s, find the date. An entry made before 1 July 1986 may mean the person in your chain was a citizen from birth rather than from registration, and a birth that looks out of sequence may not be. If the entry is later than that, the sequence is the sequence, and no reading of it helps.
Nothing here is a route around the proviso. It is a reason to check the date rather than assume it, in a family where the register has been used before.
The sequence, with dates instead of names
Take a line where the Ireland-born person is a grandparent, the parent was born in the United States, and the reader was born in the United States. The parent is an Irish citizen from birth and always was. The reader is entitled to be entered in the register at any age. Then look at what the reader’s own children inherit, purely as a function of two dates:
| The reader’s entry in the register | The child’s date of birth | The child’s position |
|---|---|---|
| March 2019 | July 2022 | Entitled to be entered in the register. The reader was an Irish citizen at the time of the birth |
| March 2019 | July 2017 | Outside the line. At the time of the birth the reader was not yet an Irish citizen |
| Never made | Any date | Outside the line, and so is the reader |
| Made before 1 July 1986 | Any later date | The proviso does not apply to that entry; check the date on the document rather than assuming |
The second row is the one that arrives badly, usually because a sibling registered earlier and their children qualify. There is nothing to appeal in it. It is not a decision anyone made about the child; it is the date.
Who can be entered, and who cannot
- Entitled: a person born outside the island of Ireland whose qualifying parent was also born outside the island but was an Irish citizen at the time of that person’s birth. There is no age limit and no residence condition in section 27.
- Not a section 27 case: a person whose qualifying parent was born in the island of Ireland. Already a citizen from birth — a citizen without having applied — and the next step is a passport, not a register entry.
- Not entitled: a person whose qualifying parent was a citizen by registration where the entry came after the person’s birth. This is the break, and it is permanent.
- A separate question entirely: a person with no Ireland-born ancestor in the chain at all. Descent has nothing to offer there, and naturalisation on the ground of Irish associations is a discretionary application to a different decision-maker.
The copy of the entry is the document you will use for decades
Section 27(4) is short and worth knowing about before you file. A document purporting to be a duly authenticated copy of an entry in the register “shall be admitted in evidence without proof of the signature or seal whereby it is authenticated,” and “until the contrary is proved, be deemed a true copy of the entry and accepted as proof of the fact and terms thereof.”
In plain terms: the certified copy of your register entry is self-proving. It is what you will show for a first passport, for a child’s own registration years later, and to any authority that asks when your Irish citizenship began. Section 27(6) contemplates regulations for amending or deleting incorrect entries, with notice to the person affected — which is the reason to read every name, date and place on the entry the week it arrives rather than filing it away. A spelling that drifted between your grandparent’s certificate and your own is easier to deal with as a correction than as a discrepancy found by somebody else in fifteen years.
If the next child is already born
Then say it plainly rather than paying to find out slowly. A child born before your entry is outside the Irish line and their own descendants are too, and the register has no mechanism for the case. What remains for them is the same thing that remains for any line that has run out: a discretionary application, decided by the Minister for Justice rather than by the Department of Foreign Affairs, on grounds that are not an entitlement.
What you can still do is stop the same date from deciding anything else. Registering on the register is the filing itself, in order. And the seven ways a descent line breaks puts this one beside the others, because a registration made too late is the only break on this site that the reader had a chance to prevent.