US UK Accountants: Escrow and Warranty Claims on a UK Sale

When an American sells a UK company, HMRC taxes the whole price in the tax year of disposal, including money locked in escrow or a retention. The IRS generally taxes a restricted escrow only when it is released. A later warranty claim reopens the UK sale year by claim, but on the US return it normally belongs to the year it is paid.

That two-line summary hides most of the work. For the US UK Accountants who prepare both sets of returns, the sale year is rarely the difficult one. The difficult years are the two to seven that follow, when the escrow is released at a different exchange rate, a warranty or tax-covenant claim is settled, HMRC repays some of the tax, and a foreign tax credit already used on a US return turns out to be too large. At Jungle Tax we prepare those later-year returns as a matter of routine, and this guide sets out what each one has to show.

It deals with reporting and compliance only. It does not repeat the mechanics of spreading gain over several years, which are covered in our guide to instalment sale reporting on a UK company sale, or the treatment of variable consideration and paper, which is covered in our guide to earn-outs and loan notes. Here the price is fixed. The only questions are when the held-back part is taxed, and what happens if some of it goes back to the buyer.

What is the difference between an escrow, a retention and a warranty claim?

The three terms are often used loosely, and the tax treatment follows the legal position, so it is worth being exact.

• Escrow. Part of the price is paid by the buyer at completion into an account held by an independent agent or jointly by the two sides' solicitors. It is released to the seller on a set date, less any agreed or determined claims.
• Retention. The buyer simply keeps part of the price and pays it later, again less any claims. Commercially it is similar to an escrow. Legally the seller holds an unsecured promise from the buyer, not an interest in a ring-fenced account.
• Warranty claim. The seller gave statements about the company in the sale agreement. If one proves untrue and the buyer suffers loss, the seller pays damages, subject to the caps, thresholds and time limits in the agreement.
• Tax-covenant claim. The seller separately promised to pay, pound for pound, pre-completion tax liabilities of the company that surface later. Tax-covenant exposure commonly runs for longer than general warranty exposure, often for around seven years.

A well-drafted sale agreement says that any payment under the warranties or the tax covenant is, so far as possible, a reduction in the price paid for the shares. That sentence does a great deal of tax work on both sides of the Atlantic, and it is the first clause we look for when preparing a later-year return.

Is escrowed money taxed at completion or on release in the UK?

At completion. More precisely, in the tax year in which the disposal takes place, which for an unconditional contract is the date of the contract and not the date the money arrives.

Section 48 of the Taxation of Chargeable Gains Act 1992 requires the consideration to be brought into account without any discount for the delay in receiving it and, in the first instance, without regard to the risk that part of it may prove irrecoverable or to the fact that the right to it is contingent. HMRC's Capital Gains Manual confirms that deferred consideration which is ascertainable but contingent is treated in the same way as any other ascertainable amount. An escrow or retention of a fixed sum is the clearest example: the amount is known on day one, and only its payment is conditional.

The practical results for the UK self-assessment return are these.

• The full headline price, including the escrowed or retained sum, goes into the capital gains computation for the tax year of disposal.
• The Capital Gains Tax on all of it is due on 31 January following the end of that tax year, whether or not the escrow has been released by then.
• No deduction is taken for the possibility of a claim. HMRC's position is that the contingent liability is ignored until it is actually enforced.
• Any interest earned on the escrow and paid to the seller is savings income, taxed separately from the gain. It does not change the base cost or the proceeds.

Can the UK tax itself be paid in instalments?

Sometimes. Section 280 of the same Act allows the tax to be paid in instalments where the consideration is payable by instalments over a period exceeding 18 months that runs beyond the normal due date. HMRC's manual indicates that the tax instalments are generally set at half of each consideration instalment until the tax is paid. A 12-month escrow will not meet the 18-month condition. A 24-month retention may, but the bulk of the tax will already have fallen due on the completion payment. It is an application made by each seller individually, not an automatic entitlement.

How does the US return treat the same escrow?

The US asks a different question. It is not whether the amount is ascertainable, but whether the seller has actually or constructively received it.

IRS Publication 537 draws the line. If the buyer's obligation is fully discharged by paying the balance into an irrevocable escrow that simply pays out to the seller over time, the seller is treated as paid in full and the whole gain is reported in the year of sale. If the escrow places a substantial restriction on the seller's right to the money, one that serves a genuine purpose of the buyer, the sale can still be reported on the instalment method. An escrow that exists to meet the buyer's warranty and tax-covenant claims is the standard example of a substantial restriction, because the seller may never receive the money at all.

For a typical UK share sale by a US citizen, the default US position is therefore as follows.

• The sale is an instalment sale, because at least one payment is received after the end of the tax year of sale.
• The instalment method applies automatically unless the seller elects out on a timely filed return for the sale year.
• Form 6252 is filed for the sale year and for each later year until the final payment, including a year in which nothing is received.
• The gain attributable to the escrowed sum is reported in the year of release, at that year's rates.

A plain retention, where the buyer holds the money, reaches the same answer by a shorter route. There is no account to analyse, only a deferred payment.

What if the seller elected out, or reported everything in the sale year?

Then the US and UK returns line up in the sale year, which is often exactly why the election is made: the UK tax and the US gain fall in matching periods and the foreign tax credit is easier to use. The cost is that the US return has taxed money the seller may have to give back. The mechanics of that election, and its deadline, are in the instalment sale guide linked above. What matters here is the consequence. A seller who elected out has a completely different later-year return from one who did not, so the first thing to establish from the sale-year return is which path was taken, and whether it was taken validly. Reporting the full gain on Form 8949 on a late-filed return is not the same thing as a valid election.

The interest charge on large deferred balances

Where the sale price exceeds $150,000 and the seller's instalment obligations arising in the year and still outstanding at the year end exceed $5 million, section 453A imposes an annual interest charge on the deferred tax. A ten per cent escrow on a sale of any size above roughly £40 million can cross that line by itself. The charge is reported as additional tax on the individual return each year the balance remains outstanding, and it is not deductible for an individual.

US versus UK: the same events on two returns

Event	UK return (HMRC)	US return (IRS)
Completion, with part of the price in escrow or retained	Whole price taxed in the tax year of disposal. No discount for delay or risk.	Restricted escrow or retention: instalment method by default, Form 6252. Gain on the held-back sum deferred.
Release of the escrow in full	Nothing further to report on the gain.	Gain on the released sum reported in the year of release. Currency difference since completion reported separately.
Warranty claim paid out of the escrow	Claim under section 49 reduces the consideration for the original disposal. Tax discharged or repaid for that year.	Instalment method: selling price is reduced and the gross profit percentage is refigured for remaining payments. Earlier years are not amended for the gain.
Warranty claim paid from the seller's own funds after all gain was reported	Same section 49 claim against the original disposal.	Capital loss in the year of payment. The sale-year gain stands.
Escrow never recovered because the buyer fails	Claim under section 48 once the sum is shown to be permanently irrecoverable.	Unreported gain on that sum is never recognised. Any unrecovered basis is dealt with in the year the loss is established.
UK tax repaid after a successful claim	Repayment, normally with repayment interest that is not taxable in the UK.	Foreign tax redetermination. The US return on which the credit was used must be amended.
Interest earned on the escrow	Savings income of the person entitled to it.	Interest income. Part of a release may also be recharacterised as interest if none is stated.

What happens on the UK return when a warranty claim is paid?

The UK does not treat the payment as a loss of the year in which it is made. It goes back and corrects the original disposal.

Section 49 of the 1992 Act provides that, in the first instance, no allowance is made for a contingent liability in respect of a warranty or representation given on a sale. If that liability later becomes enforceable and is being or has been enforced, then on a claim the computation is adjusted, by discharge or repayment of tax or otherwise. HMRC's manual at CG14805 gives the method: the gain is recomputed as if the consideration had been reduced by the amount paid.

Four points matter in practice.

1. It needs a claim. Nothing happens automatically. If the sale-year return is still within its amendment window the adjustment can be made there. If not, a separate claim is made outside the return.
2. The test is factual. The liability must have become enforceable and have been enforced. A reserve, a disputed notice of claim or a without-prejudice offer is not enough. A settled claim that has been paid is.
3. The clock starts late. HMRC's manual treats the four-year time limit as running from the date on which the conditions for the claim are met, not from the date of the sale. That matters where a claim notified in year two is only settled after litigation in year five.
4. The relief is given at the rate originally paid. Because the original computation is corrected, the repayment reflects the Capital Gains Tax rate and any Business Asset Disposal Relief that applied in the disposal year, not the rates in force when the claim is settled.

Are tax-covenant payments treated the same way?

Section 49 refers to a warranty or representation. A tax covenant is technically an indemnity. HMRC's long-standing published practice has been to give the same treatment to a payment the seller makes to the buyer under an indemnity given on the sale. The safer position, and the one sale agreements are drafted to secure, is that the payment is made to the buyer and is expressed to reduce the purchase price. Where the seller instead pays the target company directly, or pays a sum that exceeds the price received, the analysis is less straightforward and should be checked against the agreement before a claim is drafted.

What if the buyer never pays the retention?

That is a different provision. Where part of the consideration brought into account proves irrecoverable, for example because the buyer becomes insolvent before a retention falls due, section 48 allows an adjustment on a claim. HMRC's guidance on claims that consideration is irrecoverable requires the seller to identify the event that made the sum permanently irrecoverable and the amount involved. Slow payment is not irrecoverability.

How does the US treat a repayment in a later year?

The US annual accounting principle points the other way. A correctly filed return for a closed year is not reopened because of something that happened afterwards. The later event is reported in the year it occurs, with its character taken from the original transaction.

If the instalment method was used and the claim is met from the escrow

The selling price has gone down. Publication 537 sets out the method for a reduced selling price: the gross profit is refigured, the gain already reported in earlier years is subtracted, and a new gross profit percentage is applied to the remaining payments. The sale-year Form 6252 is left as filed. On a share sale by a founder with a very low basis the percentage barely moves. The real effect is simply that the forfeited amount never becomes a payment, so the gain on it is never reported.

If the gain was already reported and the seller pays the claim

This covers a seller who elected out, a seller whose escrow has already been released, and any claim that exceeds the escrow. The payment is a capital loss in the year it is paid, because it relates back in character to a capital sale. IRS Publication 525 states the general rule for repayments: a repaid capital gain is deducted as a capital loss in the year of repayment, on Schedule D.

That creates the mismatch sellers find hardest to accept. An individual cannot carry a capital loss back. It is set against capital gains of the payment year, then against up to $3,000 of other income, with the balance carried forward. A founder who paid US tax on a large gain in the sale year and repays £500,000 three years later, in a year with no gains, has a loss that may take a long time to absorb.

Where the repayment exceeds $3,000 and the original amount was included in income because it appeared the seller had an unrestricted right to it, the claim-of-right computation in section 1341 may allow the tax for the payment year to be reduced by the tax the repaid amount bore in the earlier year, instead of taking the deduction. Publication 525 describes both methods and the return uses whichever gives the lower tax. Whether a particular warranty or tax-covenant payment qualifies depends on the facts and the wording of the agreement, so it is tested claim by claim, not assumed.

Section 1248 and the character of the adjustment

Where the UK company was a controlled foreign corporation, part of the sale-year gain may have been reported as a dividend under section 1248 and not as capital gain. A later price reduction then raises a second question about how much of the original recharacterised amount is affected. Our guide to section 1248 on the sale of a UK limited company explains the original computation that any later adjustment has to be traced back to.

Which year gets amended, and which does not?

This is the question we are asked most often, and the answer is not symmetrical.

• UK sale year: yes, by claim. The original disposal computation is corrected under section 49 or section 48 and tax is repaid.
• UK payment year: no. The warranty payment is not a loss of the year in which it is paid.
• US sale year, for the gain: no. If the return was correct when filed, the gain stands. The adjustment is made in the release year or the payment year.
• US year in which the UK tax was credited: yes. This is the one that is missed.

When HMRC repays Capital Gains Tax that was claimed as a foreign tax credit on a US return, the repayment is a foreign tax redetermination under section 905(c). The taxpayer is required to notify the IRS and recompute the credit by filing an amended return, with a revised Form 1116, for each year in which the refunded tax was used, including any year to which it was carried back or forward. Where the redetermination increases US tax, the amended return is generally due by the due date, with extensions, of the return for the year in which the refund is received. The ordinary three-year limitation period does not protect a year affected by an unreported redetermination, and there is a separate penalty for failing to notify.

So a warranty claim settled in year four produces a UK claim against year one, a US loss or price reduction in year four, and an amended US return for whichever year the UK tax was credited. Three returns, in two countries, for one payment. Because the UK tax on a summer completion is usually paid in the second January afterwards, and UK tax years straddle US ones, the credit is frequently sitting in a different US year from the gain to begin with. The amended return has to follow the credit, not the sale.

The sterling and dollar difference between completion and release

HMRC works in sterling. If the price was fixed in sterling, an escrow of £1 million is £1 million on both dates and the UK return sees no currency movement at all.

The US return works in dollars. The sale-year computation translates the price at the rate on completion. When the escrow is released two years later, the same sterling sum buys a different number of dollars. The approach generally taken is that the gain on the sale is fixed by the completion-date rate, and the movement between completion and release is a separate foreign currency gain or loss on the right to receive sterling. That currency element is ordinary in character under section 988 and is not additional capital gain. It is not sheltered by the small exemption for personal transactions, because holding sale consideration is an investment matter.

Three further currency points follow.

• A warranty payment made in sterling is translated at the rate on the date it is paid, so the dollar loss will not equal the dollar gain originally reported on the same sterling amount.
• A UK tax repayment is translated, for the purpose of recomputing the credit, by reference to the rate at which the tax was originally translated, not the rate on the day the refund lands. Any difference is a separate currency item.
• If the price was fixed in dollars, the position reverses: the US return sees no currency movement, and the sterling value of the consideration for UK purposes is fixed at the disposal date.

A worked illustration

The figures are simplified and the exchange rates are illustrative only.

A US citizen resident in London sells her shares in a UK trading company on 15 June 2026 for £10 million. Her base cost is £100,000. £9 million is paid at completion and £1 million goes into a 24-month escrow against warranty and tax-covenant claims. Sterling is at $1.30 on completion.

• UK, 2026/27. The gain is £9.9 million on the full £10 million. Tax on the whole gain is due on 31 January 2028, five months before the escrow is due for release.
• US, 2026. No election out. Form 6252 shows a selling price of $13 million and payments received of $11.7 million. The gain on the escrowed $1.3 million is deferred. With less than $5 million outstanding, the section 453A interest charge does not apply.
• March 2028. A warranty claim is settled at £400,000 and paid to the buyer from the escrow.
• June 2028. The remaining £600,000 is released. Sterling is at $1.20.
• UK, after settlement. A section 49 claim reduces the 2026/27 consideration to £9.6 million. At a 24 per cent rate, £96,000 of tax is repayable.
• US, 2028. Form 6252 reports the reduced selling price and the final payment. The £600,000 was worth $780,000 at completion and $720,000 on release. The capital gain is measured on the completion-date value and the $60,000 fall is a separate currency loss.
• US, amended return. The £96,000 repayment is a foreign tax redetermination. The return on which that UK tax was credited is amended, with a revised Form 1116.

Had she elected out in 2026, the US return would instead have taxed the full $13 million in the sale year, and 2028 would show a capital loss on the £400,000 paid, translated at the 2028 rate, with no carryback to 2026.

What else has to be reported while the escrow is open?

• Form 6252 every year. It is required for each year of the arrangement, including a year with no receipt.
• Form 8938. A right to deferred consideration from a non-US buyer is an interest in a contract with a foreign counterparty and should be considered for reporting as a specified foreign financial asset where the filing thresholds are met.
• FBAR. Whether an escrow account is reportable depends on whose name it is in and whether the seller has signature or other authority over it. An account that can only move on joint instruction should be reviewed, not assumed to be outside the rules. Our FBAR penalty calculator shows what is at stake if an account is missed.
• Escrow interest. It is reported as income in both countries by the person entitled to it under the agreement, with credit for any UK tax on the US return.
• UK self-assessment. The capital gains pages for the disposal year carry the full price. Later years carry only the interest, plus any claim.

What if the earlier years were filed incorrectly, or not at all?

Later-year problems usually trace back to the sale year. The patterns we see most are these.

• The whole gain was reported in the sale year on the US return without a valid election out, so the release year has no Form 6252 and the currency movement was never reported.
• The escrow was left out of the UK computation on the footing that it had not been received, so UK tax was underpaid for the disposal year.
• The release was treated as tax-free on the US return because "it was already taxed in the UK".
• A UK repayment was received after a warranty claim and the US credit was never revised.
• No US returns were filed for the sale year or since, by a seller who did not realise that US citizens file on worldwide income while living in Britain.

Each has a defined correction route. Where US returns and information reports were missed non-wilfully, the IRS streamlined filing procedures allow the missed years to be brought up to date together. On the UK side, an understated disposal is corrected by amending the return if it is in time, or by disclosure to HMRC if it is not. We prepare both, and we reconcile the two so that the UK tax ultimately borne is the same figure the US credit is based on. Our US UK tax accountants page explains how a dual engagement of this kind is run.

The records to keep until the last claim period closes

• The signed sale agreement, the escrow or retention agreement and any disclosure letter.
• The completion statement showing what was paid, to whom and on what date.
• The exchange rate used for each dated event, and its source, applied consistently.
• Every notice of claim, the settlement agreement and proof of payment, showing who paid whom.
• Escrow statements, including interest credited and any tax deducted.
• The filed UK and US returns for the sale year, with the election position clearly evidenced.
• HMRC's acknowledgement of any section 48 or section 49 claim and the repayment calculation.

Tax-covenant exposure can outlast both countries' normal record-keeping periods. The file should be kept until the last contractual claim period has expired and every resulting return has been filed.

Preparing the later years properly

An escrow release or a settled warranty claim is not a footnote to an old deal. It is a reportable event on two returns, in two currencies, under two sets of rules that correct different years. Jungle Tax prepares the UK self-assessment claim, the US release-year or payment-year return, and the amended US return that a UK repayment requires, as one reconciled set. If you have sold a UK company and part of the price is still held back, or a claim has just been settled, contact our cross-border team to arrange a confidential consultation about the returns that now need to be filed.