Figures relate to tax year 2025 (US) · 2025-26 (UK)
The phrase describes a specific and surprisingly large group: people who hold US citizenship by accident of birth or parentage, live entirely outside the United States, and had no idea they carried an annual filing obligation until something forced the discovery.
How people find out
Almost always through a bank. Under FATCA, UK financial institutions must identify US persons among their customers, and their tests include place of birth. A mortgage application, a new investment account or a routine compliance sweep produces a letter asking you to confirm US status — and a life that had nothing to do with America suddenly does.
Others find out through a parent's estate, a job that required a background check, or simply reading about someone else's experience and recognising themselves in it.
The rules do not care that you left
US citizenship attaches at birth on US soil in almost all cases, and can pass to children born abroad to US-citizen parents who meet residency conditions. Neither requires a passport, a Social Security number, or any awareness on your part. The filing obligation follows the status.
Citizenship you never chose creates filings you never knew about. It is a strange arrangement, and it is the law as it stands.
The good news, which is substantial
Most accidental Americans owe no US tax at all. They live in a higher-tax country, their income is employment income, and foreign tax credits eliminate the liability entirely. The problem is compliance, not money — and compliance has a designed solution.
The Streamlined Foreign Offshore Procedures fit this situation almost perfectly: three years of returns, six years of FBARs, a non-wilfulness certification, no penalties. For someone who genuinely did not know, the certification writes itself honestly.
Should you renounce?
- Renunciation requires being tax-compliant for the five years before you do it — so getting current comes first regardless.
- There is a State Department fee, and an appointment at a US embassy or consulate.
- The exit tax applies only above certain net worth and income thresholds; most accidental Americans fall below them.
- It is irreversible, and it removes rights — the ability to live and work in the US among them.
Plenty of people get compliant and stay citizens, treating an annual filing that produces no tax as the price of an option they may want later. Others want it finished. Both are reasonable; what is not reasonable is deciding before you know the actual numbers.
Not sure where you stand?
Tell us what you hold across the US and UK. We come back with the scope and a fixed fee in writing, at no cost.
Get in TouchPrimary sources
Official guidance from the IRS, FinCEN and GOV.UK. Thresholds and rates on those pages are updated annually — check the current tax year before relying on a figure.
