Renouncing US Citizenship: The Process and the Tax Exit

What this guide is — and is not

Renouncing US citizenship is a serious, effectively irreversible legal act with consequences well beyond tax: travel to the US on the same terms as any other foreign national, effects on family petitions and inheritances, and the permanent loss of the right to live and work in the United States. Whether it is right for anyone is a personal decision, and not one a tax adviser should make for you. What follows describes how the process and its tax rules work — nothing here is a recommendation to renounce or not to renounce.

The consular process, in outline

Renunciation happens outside the United States, before a US consular officer. The sequence, in broad strokes:

1. Contact a US embassy or consulate to request a renunciation appointment and complete the forms they issue.
2. Attend in person, where the officer confirms you understand the consequences and that you act voluntarily, and you take the oath of renunciation. A substantial administrative fee is charged — the current amount is published by the State Department.
3. Await the Certificate of Loss of Nationality (CLN), the State Department's formal confirmation, approved in Washington. Banks — including UK banks working through their FATCA screening — treat the CLN as the definitive evidence that a US birthplace no longer means US status.

For tax purposes, citizenship generally ends on the date of the renunciation oath. Immigration and nationality questions belong with the State Department's published guidance and, where the position is complicated, an immigration attorney.

The tax side: Form 8854 and the five-year certification

Expatriation has its own tax procedure, and it is not optional. In the year after renouncing you file a final US return — typically a dual-status return covering the citizen part of the year — together with Form 8854, the expatriation statement.

Form 8854 does two things. It reports the facts of your expatriation — assets, liabilities, tax history. And it carries the certification that you have complied with all US federal tax obligations for the five preceding years. That certification has to be true: someone with unfiled returns or missed information reports cannot properly make it, which is why the practical sequence for anyone behind is to catch up first — usually via the streamlined procedures — and only then renounce. Failing to certify does not block the renunciation itself, but it automatically makes you a covered expatriate, with the consequences below.

Covered expatriates and the exit tax

The exit tax regime applies to covered expatriates — those who meet any one of three tests at expatriation, as set out on the IRS's expatriation tax pages:

• Net worth: worldwide net worth of $2 million or more on the expatriation date (a figure that is not inflation-indexed, and captures pensions and property, not just cash);
• Tax liability: average annual net US income tax for the five prior years above an inflation-adjusted threshold ($206,000 for expatriations in 2025, per the IRS);
• Certification failure: inability to certify five years of compliance on Form 8854 — regardless of wealth or income.

A covered expatriate is treated as having sold all worldwide assets at fair market value on the day before expatriation. Net deemed gain above an inflation-adjusted exclusion is taxed as if the sales were real. Certain items sit outside the mark-to-market rule and are handled under their own, generally harsher, regimes — deferred compensation and some pension interests among them — and gifts or bequests a covered expatriate later makes to US persons can trigger tax for the recipients. The same regime applies to long-term Green Card holders who expatriate.

Getting the order right

The pattern that produces clean exits is consistent: confirm the five compliance years (catching up first if needed), value assets and test covered-expatriate status, take advice on anything the mark-to-market rule would hit, then renounce, then file the final return and Form 8854 on time. The pattern that produces expensive ones is equally consistent — oath first, questions later. Renunciation ends the future obligations; it never erases the past ones, and the final filings are where the whole history is settled.