Accidental Americans: US Tax Duties You Never Knew You Had

How people become American by accident

US citizenship arrives at birth through two doors. Birthplace: with narrow exceptions, anyone born on US soil is a citizen — including babies born during a parent's brief work posting, study year or even holiday. Parentage: a child born abroad to a US citizen parent (or two) is often a citizen from birth as well, where the parent met the physical-presence conditions in force at the time.

Neither door requires consent, registration or a passport. Citizenship acquired this way is fully real: it does not lapse from disuse, and it carries the same lifetime tax status as any other American's. That is the mechanism behind every accidental American — a legal status acquired in infancy, and a tax system that follows citizenship rather than residence.

The moment of discovery

Almost nobody discovers this by reading tax law. The trigger is usually one of a handful of moments: a bank compliance letter, a US-born parent's death and estate paperwork, a passport or visa application, or a mortgage adviser spotting "Place of birth: New York" on a passport.

The instinctive reaction — decades of missed returns, imagined penalties — overshoots badly in most cases. Unfiled US returns from a person fully taxed in the UK typically show little or no US tax due once foreign tax credits are applied. The genuine exposure sits in information reporting — the FBAR and friends — and that exposure is exactly what the IRS's catch-up procedures are designed to switch off for people who did not know.

Banks and the FATCA letter

Under FATCA, non-US banks must screen customers for US indicia — a US birthplace on file, a US address or phone number, standing transfers to the US — and ask flagged customers to confirm their status, usually by providing a US taxpayer identification number or evidence they are not a US person.

This is why the letter arrives out of nowhere: the bank is not accusing you of anything, it is completing its own compliance. But the letter has teeth. Left unanswered, accounts are commonly reported to the IRS as US-held regardless, and some institutions restrict or close accounts they cannot document. A US birthplace is the one indicator that cannot be explained away without proof of loss of citizenship — which is why accidental Americans, of all people, cannot simply ignore the post.

The way in from the cold

For someone who genuinely never knew, the route back is well established and forgiving:

1. Confirm the citizenship question. Especially for those claiming through a parent, establish whether you actually are a citizen before doing anything tax-shaped.
2. Get a US taxpayer identification number — a Social Security number, applied for through the Federal Benefits Unit for those abroad — since filings need one.
3. Use the Streamlined Foreign Offshore Procedures: three years of returns, six years of FBARs and a certification that the failure was non-wilful. Penalties are waived; a lifetime of missed years is not required — the defined three-and-six package is the whole point.

The certification of non-wilfulness is rarely more natural than in an accidental American's hands: not knowing you were a US taxpayer is the paradigm case the programme was written for. Timing still matters — the route closes if the IRS opens an examination first, and FATCA data means discovery is no longer hypothetical.

The longer-term choice

Once compliant, accidental Americans face a genuine fork. Some keep the citizenship and absorb the annual filing routine — often cheap in tax, if tedious in paperwork. Others conclude that a lifelong reporting relationship with a country they may never have lived in is not worth keeping, and pursue renunciation — a formal process with a tax exit procedure of its own. Both are legitimate; which fits depends on your ties, assets and appetite for annual admin. What is no longer sensible, once the letters have started arriving, is doing nothing.