A two year clock, a five per cent test and a lifetime cap

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

Disposal relief turns on four conditions. Three of them are already fixed by the time anybody mentions a buyer.

Two years of qualifying ownership. Five per cent of the shares and votes. An officer or employee role throughout. Then a company that is genuinely trading.

So most failed claims fail on history rather than on the deal. An American owner has a fifth condition on top, which is that none of this registers with the IRS at all.

Key takeaways

• Disposal relief cuts the UK rate on a qualifying business sale.
• It has a lifetime limit, not an annual one.
• You generally need two years of qualifying ownership.
• A 5% shareholding and an officer or employee role are usually required.
• America taxes the gain at its own rates regardless.
• A lower UK bill means a smaller foreign tax credit.
• The investment income surcharge can apply on top.
• Plan the two sides together, well before you sell.

What is Business Asset Disposal Relief?

A reduced capital gains rate when you sell a qualifying business. Per GOV.UK guidance on the relief, it applies to the whole or part of a trading business, or to shares in your personal company. For 2025-26 the rate is 14%, against a main rate of 24% on residential property and 24% on other assets for higher rate taxpayers.

It replaced the older entrepreneurs' relief.

The rate has been rising in recent years.

What is the lifetime limit?

A cap on how much gain can ever benefit, currently £1 million across your whole life. Once you have used it, later sales fall back to the ordinary rates. Serial founders often exhaust it on an early exit and forget that the second company gets no help at all.

It is cumulative, not annual.

So track what you have already used.

How long must you have owned it?

Two years, on the usual conditions, ending with the disposal. That period is why the relief rewards planning rather than reaction. Somebody who incorporates, trades for eighteen months and sells has no claim, however genuine the business was.

Our guide to selling a UK business covers the wider sale.

Two years is the gate.

What is the personal company test?

A rule about how much of the company you hold and what you do there. You normally need at least 5% of the ordinary shares and voting rights, plus a right to a reasonable share of proceeds. You also have to be an officer or employee throughout the qualifying period.

Our guide to cap tables with US citizens on them covers shareholdings.

Dilution below the threshold breaks the claim.

Does the company have to be trading?

Yes, and this is where claims most often fail. A company holding significant investments or surplus cash can lose its trading status, which removes disposal relief entirely. Owners who bank profits inside the company for years sometimes destroy the disposal relief they were saving the cash to enjoy.

Our guide to running a UK limited company as an American covers the structure.

So review the balance sheet long before a sale.

Does disposal relief apply to a property business?

Usually not, because letting is treated as an investment rather than a trade. A portfolio of buy to lets will not qualify however actively it is run, though a genuine hotel or serviced operation might. So American owners with British property normally find this relief closed to them from the start.

Our guide to UK rental income on a US return covers the letting position.

But furnished holiday lettings changed recently as well.

Does it cover share options?

Disposal relief can reach them, where the shares come from a qualifying scheme and the usual conditions are met. Options exercised on the day of sale rarely satisfy the two year test on their own, which catches out employees coming along for the ride.

Our guide to EMI options for US citizens covers the schemes.

Timing of exercise matters enormously.

What about selling the trade rather than shares?

Disposal relief can apply to a business sold as a going concern, though the conditions differ. A sole trader or partner selling the whole or part of a business may qualify where assets are sold with it. Selling individual assets alone usually will not.

Our guide to Form 8858 and foreign branches covers the unincorporated case.

The structure decides the route.

Does a management buyout qualify?

It can, provided the selling shareholders meet the usual tests. The buyer's structure does not generally affect your own claim, so a sale to your own managers is treated much like any other. What matters is your position in the two years leading up to completion, not who writes the cheque.

So the purchaser is largely irrelevant.

Because the conditions all look backwards at you.

What if you hold the shares through a trust?

Trustees can sometimes claim, but only where a beneficiary meets the conditions personally. The rules are narrow and the paperwork specific, so a trust holding is more likely to complicate a claim than to help one. For an American beneficiary the trust brings its own reporting on top.

Our guide to UK trust distributions and US reporting covers the reporting.

So trusts rarely simplify an exit.

Can you spread it across a spouse?

Sometimes, where the spouse genuinely qualifies in their own right. Each person has their own disposal relief lifetime limit, so a couple who both meet the conditions can shelter more. The spouse must actually satisfy the shareholding and employment tests, not merely hold shares on paper.

Our guide to a non-resident alien spouse covers the American side.

Paper arrangements made late rarely work.

When do you claim it?

You claim disposal relief on your Self Assessment return for the year of the sale. There is a claim deadline running to the first anniversary of the filing deadline for that year, so it is not something to leave indefinitely. The American return is prepared separately on its own timetable.

Our guide to registering for Self Assessment covers the return.

Diarise the claim deadline at completion.

What happens if the deal falls through?

Nothing, because there has been no disposal. The qualifying clock carries on running, which is occasionally helpful for somebody who was marginally short of two years. Costs incurred on an aborted sale are a separate question and are generally not deductible against a later gain.

So an aborted deal is not a reset.

But the professional fees are usually lost.

Is disposal relief likely to survive?

It has been narrowed steadily rather than abolished. The lifetime limit was cut sharply in 2020 and the rate has risen since, so the direction of travel is clear enough. Anybody planning an exit several years out should model it without assuming today's rate still applies then.

So treat the current rate as a ceiling, not a promise.

Because each Budget has moved it recently.

Does the relief affect your UK payment date?

It changes the amount rather than the timing. Capital gains on shares are reported through Self Assessment and paid by the January following the tax year, so a sale early in the year can leave a long gap before anything is due. The American payment runs on its own calendar entirely.

Our guide to US tax deadlines for expats covers the American dates.

So set the money aside rather than spending it.

Why does America not match it?

Because it has no equivalent concession for founders selling a private company. The gain is a capital gain, taxed at the ordinary long term rates with no special founder relief in most cases. So the American bill is calculated as though the British relief did not exist.

There is no treaty article that fixes this.

The two systems simply differ.

A worked example

Take an illustrative example. An American founder in Bath sells her company for a gain of £800,000.

With the relief, Britain charges 14%, so roughly £112,000. Without it, the bill would have been far higher.

America then taxes the same gain at its long term rates, and the credit she can claim is limited to the British tax actually paid.

So the relief saved her a great deal in Britain and handed most of it to the IRS. Her net position barely improved.

One sale, two bills

Does the foreign tax credit rescue it?

Only up to what you actually paid. The credit is for British tax suffered, so reducing that tax reduces the credit by the same amount. That is why claiming disposal relief rarely improves an American owner's overall position by as much as the British saving suggests.

Our guide to Form 1116 income baskets covers the limits.

Less British tax means less credit.

Should you still claim it?

Almost always, yes. Not claiming simply hands more to HMRC without reducing the American charge, because the credit would then be capped by the American tax anyway. There are narrow cases where the arithmetic differs, but they are genuinely rare.

Claim disposal relief unless modelling says otherwise.

Deliberately overpaying Britain helps nobody.

What about the investment income surcharge?

It can apply to the gain and no foreign credit touches it. The net investment income tax sits outside the credit system, so an American founder can pay British tax, claim a credit against the main charge, and still face this separately on the same money.

Our guide to the net investment income tax covers it.

This is the charge people forget to budget for.

Does currency change the gain?

Considerably, and in either direction. America measures the gain in dollars using the rate when you acquired the shares and the rate when you sold. A founder who incorporated when the pound was strong can face a larger dollar gain than the sterling figure suggests.

Our guide to exchange rates on a US return covers the method.

So the two gains rarely match.

What if you took a check-the-box election?

Then the sale changes character for American purposes. A disregarded company is treated as a collection of assets rather than a share sale, so you are selling goodwill, equipment and contracts instead. That produces a different mix of income, some of it taxed at ordinary rates.

Our guide to the check-the-box election covers the choice.

The election shapes the exit, years ahead.

Does an earn-out complicate it?

Yes, on both sides and differently. Britain values the right to future payments at completion, while America may tax the instalments as they arrive. Those timing differences can push the two charges into different years, which strands the credit.

Mismatched years are the hidden cost of an earn-out.

So model the timing, not just the total.

What about selling to an employee trust?

A different British relief applies, and it can beat disposal relief outright. Selling a controlling interest to an employee ownership trust can remove the UK charge entirely in the right circumstances. The American charge, once again, carries on untouched.

Our guide to employee ownership trusts covers that route.

A nil UK bill means no credit at all.

Does emigrating before the sale help?

Rarely for an American, because citizenship follows you anyway. Leaving Britain might reduce the UK charge, but it also removes the credit that was offsetting the American one. The usual effect is to swap a credited bill for an uncredited one.

Our guide to moving back to the US covers the exit year.

Temporary non-residence rules also bite.

What should you tell your UK accountant?

That you are American, early and plainly. A British adviser optimising purely for HMRC will reach for disposal relief automatically, which is right, but they will not price the American consequence of an earn-out or a restructuring. So they need to know there is a second tax system watching every step of the deal.

Because the two advisers rarely speak unless asked.

So introduce them before the heads of terms are signed.

What records should you keep?

The share certificates, the dates you acquired and sold, evidence of your role in the company, and the completion statement. Those four prove the conditions years later. Add the exchange rates for the American calculation.

In our practice the employment evidence is what goes missing.

Keep payslips and board minutes.

How far ahead should you plan?

Two years at least, because that is the qualifying period. Realistically the useful work starts earlier, when the share structure and the balance sheet can still be adjusted without looking artificial. Planning in the month before completion is mostly damage limitation.

The best decisions happen years before a sale.

So raise it early with both advisers.

How to plan a UK company sale as an American

1. Check the two year qualifying period against your actual dates.
2. Confirm your shareholding and your officer or employee role.
3. Review whether surplus cash has damaged trading status.
4. Work out how much lifetime limit you have already used.
5. Model the American charge in dollars, not pounds.
6. Price the investment income surcharge separately.
7. Decide the earn-out structure with both tax systems in view.
8. Claim the disposal relief on the UK return by the claim deadline.

Mistakes and penalties we see with disposal relief

The first is assuming a lower British rate means a lower overall bill for an American owner.

The second is letting cash build inside the company until trading status is at risk.

The third is diluting below the shareholding threshold during a funding round.

The fourth is agreeing an earn-out that lands the two charges in different tax years.

How US UK Tax Accountants helps

We model both charges before the deal is signed, because the British relief and the American rates interact in a way neither adviser sees alone.

Then we structure the timing so the credit actually lands. Our business tax service covers the company side.

If a sale is anywhere on the horizon, get in touch while the structure can still be changed.

Last reviewed 22 October 2026. This article is general information and not personal tax advice, and rates and limits change each year.