America sells everything you own the day before you stop being American

Figures relate to tax year 2025-26 (UK) · 2025 (US)

Most people approach renunciation as an administrative act. You book an appointment, you swear an oath, you hand over the passport, and the American tax system releases you.

For a large minority it is not that simple. America runs a final reckoning on the way out, treating you as if you sold every asset you own on the day before you expatriated. The gain is taxable even though you sold nothing and no money changed hands.

That charge is the exit tax, and it does not apply to everyone. Whether it reaches you depends on three tests, and failing any one of them is enough. People caught by it are usually surprised, because two of the three tests have nothing to do with wealth.

Key takeaways

• The exit tax applies only to people classed as covered expatriates.
• Three tests decide that, and failing any one is enough.
• The charge is a deemed sale of your worldwide assets at market value.
• An exclusion covers roughly the first $890,000 of gain for 2025.
• Pensions and deferred compensation follow their own separate rules.
• Form 8854 must be filed whether or not any tax is due.
• Britain taxes nothing on the same event, so no credit exists.

What is the exit tax?

It is a charge on unrealised gains that applies when a covered expatriate gives up American citizenship or long-term residence. According to IRS guidance, the rules treat you as having sold all of your property at fair market value on the day before your expatriation date.

The point is to tax appreciation that built up while you were American, before you leave the system that would otherwise have taxed it. It is a closing of accounts rather than a penalty for leaving.

Nothing actually changes hands. You keep every asset you owned, and the charge arises purely because the law deems a sale to have happened on a particular date.

Who is a covered expatriate?

Anyone who fails any one of three tests on the date they expatriate. The first looks at net worth, the second at your average American tax liability over five years, and the third at whether you can certify five years of tax compliance.

The net worth test catches you if your worldwide net worth is $2 million or more. Congress has never indexed that figure, so it catches more people each year as asset prices rise.

The tax liability test looks at your average annual American income tax across the five years before expatriation. The threshold moves with inflation and sits around $206,000 for 2025. Most people in Britain fall well under it, because foreign tax credits reduce the American liability to very little.

Why does the certification test catch people?

Because it has nothing to do with money. You must certify under penalty of perjury that you have complied with all American federal tax obligations for the five years before expatriation, and you cannot certify what is not true.

Someone with modest assets and almost no American tax can still become a covered expatriate purely by having missed returns. That is the single most common route into the charge for people living in Britain.

The answer is to fix the compliance before renouncing rather than after. Our guide to streamlined filing covers the catch-up route most people need.

How is the charge calculated?

The exit tax takes the market value of everything you own on the day before expatriation, subtracting your cost in each asset, and treating the net gain as realised. The result goes on your final American return, at the rates a real sale would have attracted.

An exclusion then removes a slice of that gain. For 2025 it covers roughly the first $890,000, and it rises each year with inflation. A modest portfolio therefore often produces no charge at all.

You allocate the exclusion across your gains in proportion rather than against one asset. That matters where some assets carry large gains and others carry losses.

A worked example

The figures below are illustrative. They use round numbers so you can follow each step and substitute your own.

Helen is American, has lived in Bath for thirty years and renounces in 2025. Her worldwide net worth is £2.2 million, so she fails the net worth test and is a covered expatriate.

Her assets carry total unrealised gains of about $1.4 million, mostly in a British share portfolio and her home. The deemed sale brings all of that into charge on her final return.

The exclusion removes roughly $890,000, leaving about $510,000 taxable. At long term capital gains rates the exit tax comes to somewhere near $102,000, payable with her final return.

Britain taxes none of this, because she sold nothing and no British disposal happened. There is therefore no British tax to credit, and the American charge lands in full.

How the three tests compare

The table sets out what each test measures. You only have to fail one.

What about your pension?

Pensions sit outside the exit tax deemed sale and follow a separate regime, which is usually a relief rather than a problem. An eligible deferred compensation arrangement can face 30 per cent withholding on future payments instead of an immediate charge.

A British workplace pension is rarely an eligible arrangement in the technical sense, because that status depends on the payer agreeing to withhold. Where it is not eligible, the rules bring the present value into charge immediately instead.

That distinction is worth establishing early, because a large pension can change the whole picture. Our guide to UK pensions and US tax covers the underlying treatment.

What happens to an ISA or a British portfolio?

Both fall squarely inside the deemed sale, valued at market on the day before you go. An ISA gets no shelter, because America never recognised the wrapper in the first place.

Pooled funds add a second layer. Where a holding is a PFIC, the deemed disposal triggers that regime rather than ordinary capital gains treatment, which can produce a much larger charge.

Our guide to the ISA and PFIC problem explains why. Cleaning up fund holdings before you go usually beats any other single step.

Can you defer the payment?

You can elect to defer the charge on a specific asset until you actually sell it. That helps where the exit tax falls on something illiquid like a house. You make the election asset by asset on Form 8854.

The conditions are demanding. You have to provide adequate security, usually a bond, and waive any treaty right that would prevent collection. Interest runs on the deferred amount throughout.

In practice the security requirement defeats most people. It is worth exploring where a single large asset drives the charge, and rarely worth it otherwise.

What does Form 8854 actually do?

It reports your expatriation and makes the certification that decides covered status. Every expatriate files it, whether or not any exit tax is due, and it is how you formally tell the system you have left.

The form carries a balance sheet of your worldwide assets and liabilities at market value. That schedule is what establishes whether you crossed the net worth threshold.

Failing to file it keeps you covered regardless of your actual position. The form is the mechanism by which you prove you are not caught, so skipping it concedes the point.

Is there any relief for accidental Americans?

There is a specific set of relief procedures for certain former citizens, aimed at people who never knew they were American. It lets you regularise some past non-compliance without becoming a covered expatriate.

The conditions are narrow. Your average annual American tax liability must be low, your net worth must sit under the threshold, and the failure to file must have been non-wilful. Meeting all three takes you out of the exit tax entirely.

Our guide to the accidental American covers who this typically reaches. Where it applies it is a far better route than ordinary catch-up filing.

Does Britain charge anything?

No. Britain has no exit charge on citizenship and no concept of an expatriation tax at all. Nothing happens on your British return when you renounce, and HMRC takes no interest in the event whatsoever.

That silence is the problem rather than the relief it sounds like. A foreign tax credit relieves tax you actually paid abroad, and Britain charges nothing on the deemed sale, so there is nothing to set against the American bill.

The exit tax is therefore unrelieved in full. Few charges in the cross-border system leave the treaty with so little to do.

When does the charge actually arise?

The exit tax arises on the day before your expatriation date, which for a renunciation is the date you take the oath at the embassy. The deemed sale uses values on that single day.

The timing gives you some control. Expatriating early in a calendar year splits your final period differently from expatriating in December, and market values on the chosen date drive the whole computation.

Our guide to renouncing US citizenship covers the process and the sequencing around it.

Does the exit tax apply to green card holders?

It can, where you are a long-term resident. Holding a green card in at least eight of the fifteen tax years ending with the year you give it up puts you in the same regime as a citizen who renounces.

The eight years need not be consecutive, and a partial year of holding counts as a full year. People are regularly caught having assumed a green card carries no tail.

Our guide to green card holders in the UK covers the wider position. Formally abandoning the card is what starts the clock on all of this.

What counts towards the net worth test?

Everything you beneficially own anywhere in the world, less what you owe. Your home, pensions, business interests, life policies with a surrender value and any interest in a trust all go into the schedule.

Valuations are at market on the expatriation date, not at cost. A house bought in London in 1995 and a pension built over a career are the two items that most often carry someone across the line.

Jointly held assets count at your beneficial share rather than the whole. Where a spouse is not American, how the assets are held between you matters a great deal.

Can you plan the charge down?

Sometimes substantially, and always before rather than after. Gifting assets ahead of expatriation reduces net worth, though it uses your lifetime gift exclusion and has its own rules on timing and intent.

Realising losses before you go is simpler and often overlooked. A portfolio with embedded losses can be sold to offset gains elsewhere, reducing the deemed gain when the final reckoning arrives.

Splitting assets with a non-American spouse is the other common lever. Each of these takes time to do properly, which is why a year of lead time matters.

What happens to your heirs afterwards?

A covered expatriate leaves a tail that affects gifts and bequests. An American who later receives a gift or inheritance from a covered expatriate faces a separate transfer tax at the top estate rate.

That charge falls on the recipient rather than on you, which surprises families. It applies to the American child receiving the money, not to the former citizen giving it.

Avoiding covered status therefore protects your children as well as yourself. It is one of the strongest arguments for fixing the compliance test before you go.

What records will you need?

A full asset and liability schedule at market value, cost basis for every holding, and five years of filed American returns. Those three are what Form 8854 and the certification rest on.

Cost basis is the piece people lack. Shares bought twenty years ago through a British broker often have no dollar cost recorded anywhere, and reconstructing it later is slow work.

Start gathering it a year before you plan to go. You cannot rush the valuation work at the end.

How to work out your position

1. List every worldwide asset and liability at current market value.
2. Work out whether your net worth reaches the $2 million threshold.
3. Calculate your average US tax liability over the last five years.
4. Confirm that five years of returns are filed and correct.
5. Establish the dollar cost basis of every significant holding.
6. Model the deemed gain and apply the annual exclusion.
7. Check how pensions and deferred compensation are treated separately.
8. Fix any compliance gap before booking an appointment.

Mistakes and penalties we see with the exit tax

The first is renouncing before fixing missed returns. The certification test then fails on its own, and a person with no wealth and no tax becomes a covered expatriate for paperwork reasons alone.

The second is valuing a home at purchase price rather than market. The schedule is a market value exercise, and a London property bought decades ago often pushes someone over the threshold by itself.

The third is forgetting Form 8854 after the appointment. The oath ends the citizenship and the form ends the tax relationship, and only one of those happens at the embassy.

The fourth is assuming the treaty will soften the charge. It does not, because Britain levies nothing on the same event for the treaty to relieve.

How US UK Tax Accountants helps

We run the three tests before you commit to anything, build the asset schedule properly, and model the deemed gain against the exclusion. Where the charge looks real, we look at what you can restructure while time remains.

Where compliance gaps exist, we fix those first, because the certification test is the one most people fail avoidably. Our streamlined filing service covers the catch-up work.

If you are thinking about renouncing, get in touch a year before you plan to go. You have to pull almost every lever that reduces this charge in advance.

Last reviewed 10 October 2026. This article is general information and not personal tax advice. Every expatriation turns on its own facts, so take advice on yours before acting.

For the neighbouring question, Your father renounced in 2015. His legacy to you carries a 40 per cent charge walks through it in detail.