Accountants for US and UK: Insurance Payouts & Section 1033

When an insurer pays out more than an American's US cost basis for a destroyed, damaged or stolen UK asset, the IRS treats the excess as a gain. It can be deferred under section 1033 by reinvesting within the replacement period, while HMRC applies separate TCGA 1992 section 22 and 23 rules. Both returns must be filed consistently.

For a UK-resident American, a fire at a Chelsea townhouse, a flood in a let flat or the theft of a painting is rarely just an insurance event. It is a tax event in two jurisdictions that measure the gain in different currencies, on different dates and under different reliefs. Specialist Accountants for US and UK tax returns exist precisely to keep those two answers aligned, and this guide sets out how the rules interact, where they collide and how to report the outcome correctly on both returns, including where the event sits inside a year that was never filed.

Why does an insurance payout create a US tax gain at all?

Most homeowners assume insurance money simply "puts them back where they were". The Internal Revenue Code does not see it that way. Under US rules an insurance recovery for property that is destroyed, stolen or damaged is an amount realised on an involuntary disposition. If the reimbursement exceeds your adjusted basis in the property, the difference is a casualty or theft gain, even though you never chose to sell.

For long-held London property the gap between basis and payout can be very large. A house bought in 2004 is recorded for US purposes at its sterling cost translated into dollars at the exchange rate on the purchase date. A modern reinstatement-value policy pays today's rebuild cost, often several multiples of that figure. Fine art and jewellery are typically insured at current agreed or market value, which may bear no relation to what was paid decades ago or to an inherited basis.

Three features make the US position sharper for Americans in the UK:

• Citizenship-based taxation. A US citizen or green card holder living in London reports worldwide gains to the IRS regardless of where the asset sits or whether the UK taxes it.
• Currency. The IRS measures the gain in dollars. A sterling payout that exactly equals sterling cost can still produce a US gain (or loss) purely because the pound moved.
• Personal-use asymmetry. A gain on personal-use property is taxable, but a personal casualty loss is generally deductible only in narrow disaster-related circumstances. Gains and losses do not mirror each other.

The IRS sets out the mechanics of figuring a casualty gain in Publication 547, Casualties, Disasters, and Thefts, and the event is reported on Form 4684.

How the section 1033 involuntary conversion election works

Section 1033 of the Internal Revenue Code lets a taxpayer elect not to recognise gain from an involuntary conversion where the proceeds are reinvested in qualifying replacement property within a set period. It is a deferral, not an exemption: the unrecognised gain reduces the basis of the replacement asset and is taxed on a later disposal.

The core conditions

• An involuntary conversion. Destruction (fire, flood, storm, subsidence events that are sudden in nature), theft, or requisition or condemnation. Gradual deterioration does not qualify.
• Replacement property "similar or related in service or use". For an owner-occupier this is generally another home used in the same way. For an investor who lets property, the IRS looks at whether the replacement bears a similar relationship of services or uses to the owner, so a let flat replaced with another let flat is the natural fit. A painting is replaced by comparable art, jewellery by jewellery.
• Reinvestment of the full amount realised. To defer the whole gain the cost of the replacement must at least equal the insurance recovery (net of qualifying expenses). Any shortfall is recognised as gain, up to the total gain.
• A timely replacement. The general replacement period begins on the date of the destruction or theft and ends two years after the close of the first tax year in which any part of the gain is realised. Longer periods apply in specific cases, notably main homes in US federally declared disaster areas, which will not normally cover property in the UK. An extension can be requested from the IRS before the period expires, with reasonable cause.
• An election. Deferral for money proceeds is elective. It is made by reporting the event and the intention to replace on the return for the year the gain is realised, with a supporting statement, and the details of the replacement are reported when it occurs.

What happens to basis

The basis of the replacement property equals its cost less the gain that was not recognised. If a London flat with a US basis of $900,000 is destroyed, insurance pays the equivalent of $1,500,000 and you rebuild or buy a replacement costing $1,600,000, the $600,000 gain is deferred and the replacement takes a US basis of $1,000,000. The deferred gain resurfaces when that replacement is eventually sold, unless another exclusion such as the principal residence exclusion applies at that point.

Interaction with the principal residence exclusion

The destruction of a main home is treated as a sale for the purpose of the section 121 exclusion, which can shelter up to $250,000 of gain for a single filer and up to $500,000 for qualifying married couples filing jointly where the ownership and use tests are met. Section 1033 can then be applied to any gain above the exclusion. For a long-held London family home the sequence matters: apply section 121 first, then consider whether the balance is worth deferring under section 1033 given the basis reduction that follows.

How does HMRC treat insurance money for a damaged or destroyed asset?

The UK starts from a different premise. Under section 22 of the Taxation of Chargeable Gains Act 1992, a capital sum derived from an asset, including compensation or insurance money for damage, loss or destruction, is treated as a disposal (or part disposal) for capital gains tax purposes, even though no buyer exists. Crucially, the date of that deemed disposal is the date the capital sum is received, not the date of the fire or theft.

Section 23 then provides relief where the money is used to restore or replace the asset. HMRC explains the framework in its Capital Gains Manual at CG15700 onwards.

Asset damaged but not destroyed: restoration relief

Where the asset survives and the compensation is wholly applied in restoring it, a claim can be made so that the receipt is not treated as a disposal. Instead the sum is deducted from allowable expenditure on a later disposal. The same treatment is available where the amount not applied is small, or where the sum received is small compared with the value of the asset, which HMRC in practice treats as not exceeding the higher of 5% of the asset's value and £3,000. Where only part is used, a partial claim reduces the gain.

Asset lost or destroyed: replacement relief

Where the asset is entirely lost or destroyed and the whole capital sum is applied within one year of receipt (or a longer period HMRC allows) in acquiring a replacement asset, the owner can claim that the disposal is treated as giving neither gain nor loss, with the replacement's base cost reduced accordingly. If only part is reinvested, the relief is restricted to the amount by which the sum not reinvested is less than the gain. HMRC's treatment of a destroyed asset is at CG15740.

Buildings and land are separated

For destroyed buildings, UK law allows the building to be treated as a separate asset from the land on which it stands, so a replacement building on different land can qualify. This is helpful where a family decides not to rebuild on the same plot.

Claims, not elections

UK relief must be claimed in writing. No prescribed form exists, but the claim must identify the asset, the compensation and how the conditions are met. For individuals the general time limit is four years from the end of the tax year to which the claim relates.

Main residence and chattels

For a UK-resident American whose London home has always been their only or main residence, private residence relief will usually remove the UK gain altogether, so the UK side may be straightforward while the US side is not. Art and jewellery are chattels for UK purposes, so the chattels exemption and marginal relief (and the wasting-asset rules for certain items) must be considered before any section 23 analysis. Let property attracts no private residence relief for the let periods, which is where UK and US exposure most often coincide.

US section 1033 vs UK sections 22 and 23: side by side

Where the two systems collide: timing and currency

Different years, different clocks

The US tax year is the calendar year; the UK tax year runs from 6 April to 5 April. A fire in February 2026 with a final settlement received in May 2026 straddles two UK tax years in terms of event and receipt, while for the IRS everything may fall in 2026. Worse, the US rules can push realisation later: where there is a reasonable prospect of recovery, a casualty is not closed until it is reasonably certain how much will be paid. A complex claim for a listed building or an art collection can run for years, with interim payments landing in different UK tax years.

That matters for foreign tax credits. A US citizen resident in the UK generally pays UK capital gains tax first on a UK-situs gain and claims credit against the US tax on the same income. If the UK gain arises in 2026/27 and the US gain in 2027, the credit has to be matched to the correct US year and category. Misalignment is one of the most common reasons we see double taxation on these events.

The currency trap in reinvestment

The US deferral test is measured in dollars. Suppose a let property in Kensington is destroyed and the insurer pays £1,200,000. At receipt the pound is at $1.30, so the US amount realised is $1,560,000. Eighteen months later you buy a replacement flat for exactly £1,200,000, but sterling has fallen to $1.20, so the US cost of the replacement is only $1,440,000. On the UK side you have reinvested the whole sum and qualify for full relief. On the US side you are $120,000 short, and up to $120,000 of gain is recognised even though you reinvested every penny the insurer paid.

The reverse can also happen, and in a falling-rate environment a full sterling reinvestment can overshoot. The practical point is that the reinvestment target must be calculated in both currencies before contracts are exchanged, not after the return is drafted.

Mortgages and sterling debt

Where insurance proceeds are used to repay a sterling mortgage on the destroyed property, a separate US foreign currency gain can arise on the repayment of the loan if the pound has weakened since it was borrowed. On personal-use property such gains are taxable while the corresponding losses are not. This is entirely invisible on the UK return.

Different rates, different reliefs

UK capital gains tax on residential property and other assets is charged at 18% and 24% depending on the taxpayer's income band. US long-term capital gains rates are 0%, 15% or 20%, and the 3.8% net investment income tax may apply on top. The IRS does not generally accept that UK tax can be credited against the net investment income tax, so a residual US liability can remain even where UK tax exceeds the regular US tax on the same gain. If the gain is relieved in one country but not the other, there may be no foreign tax to credit at all.

Worked scenario: a destroyed London let property

Consider a US citizen living in London who owns a flat in Marylebone, let to tenants since purchase in 2010 for £600,000. A fire in March 2026 renders it a total loss. The insurer settles at £1,350,000 in October 2026.

1. UK computation. The deemed disposal is in 2026/27 (the date of receipt). The UK gain is roughly £750,000 before costs. If the full £1,350,000 is applied to a replacement property by October 2027, a section 23(4) claim treats the disposal as no gain, no loss and the replacement takes a reduced base cost.
2. US computation. Basis is £600,000 at the 2010 rate (say $1.55, giving $930,000) less depreciation claimed or allowable on US returns. The amount realised is £1,350,000 at the October 2026 rate. The gain includes depreciation recapture considerations on Form 4797 as well as the currency effect.
3. Reinvestment plan. The client must reinvest at least the dollar amount realised by 31 December 2028 to defer the full US gain, and at least £1,350,000 by October 2027 for full UK relief. The tighter UK deadline usually governs, but the dollar test must still be met.
4. Reporting. The 2026 US return reports the conversion on Form 4684 and Form 4797 with a section 1033 election statement. The 2026/27 UK return includes the disposal in the capital gains pages with the written section 23 claim. When the replacement is acquired, the US return for that year reports the details and the UK claim is finalised.
5. Exposure if replacement fails. If no replacement is bought, the UK gain is taxed for 2026/27 and the US gain becomes taxable for 2026, with an amended US return required and UK tax available as a credit.

Art, jewellery and other stolen valuables

Theft introduces its own timing. For US purposes a theft loss is generally treated as sustained in the year it is discovered, but a gain only crystallises when reimbursement is received or becomes reasonably certain. If a recovered item is later returned, the insurance settlement may need to be repaid and the tax position unwound.

For collectibles, US long-term gains can be taxed at up to 28% rather than the usual 20% maximum, and the replacement must be similar or related in service or use, so replacing a stolen painting with a share portfolio will not qualify. In the UK, a chattel's gain may be limited or exempt depending on its value and whether it is a wasting asset, so a meaningful US gain can coexist with little or no UK tax, leaving nothing to credit. Valuation records, purchase invoices and, for inherited pieces, the date-of-death value used for US basis become critical evidence.

What if the event happened in a year you never filed?

We regularly see Americans in London who did not realise they had to file US returns at all, or who filed UK returns only. When a large insurance settlement sits inside an unfiled year, the questions multiply:

• Can the section 1033 election still be made? The election is made on the return for the year the gain was realised. A late-filed original return can generally carry the election and the supporting statement, provided replacement occurred within the replacement period or an extension is sought. Where the replacement period has expired without replacement, the gain is simply taxable.
• Is the streamlined procedure available? For non-wilful non-filers resident abroad, the IRS Streamlined Foreign Offshore Procedures allow three years of returns and six years of FBARs to be filed without failure-to-file penalties. A casualty gain in one of those years is reported on the relevant return in the ordinary way, including any section 1033 election and foreign tax credit.
• Did the payout trigger information reporting? A seven-figure settlement landing in a UK bank account may push the account above FBAR and Form 8938 thresholds, even for someone who has never had to file them before. Our FBAR penalty calculator helps frame the exposure.
• Amended returns. Where a return was filed but omitted the gain, or reported the election and the replacement never happened, an amended US return (Form 1040-X) is required. On the UK side, an amendment within the normal window, or a disclosure to HMRC, may be needed if the section 23 claim was made but the conditions were not met.

The order of work matters: reconstruct US basis in dollars, confirm the dates of each receipt, establish the UK tax actually paid and in which tax year, and only then prepare the US returns so that credits and elections land in the right place.

Documentation the IRS and HMRC will expect

• Completion statements and purchase invoices for the original asset, with the exchange rate on each acquisition date.
• Records of capital improvements and, for let property, depreciation claimed on US returns.
• The insurance claim file, loss adjuster's report and every settlement letter showing the date and amount of each payment.
• Contracts and completion statements for any rebuild or replacement, with dates of payment.
• For art and jewellery, valuations, provenance records and any inherited-basis documentation.
• Copies of the written section 23 claim and the US election statement, retained with both returns.

How Jungle Tax prepares both returns

At Jungle Tax we prepare US and UK returns for internationally mobile families whose affairs rarely fit a single jurisdiction. For an insurance event we model the gain in both currencies, map each receipt to the correct US and UK tax year, test the reinvestment against both deadlines and both currencies, prepare the section 1033 election and the section 23 claim so the narratives match, and coordinate foreign tax credits so the same gain is not taxed twice. Where earlier years were missed, we bring them into compliance through the appropriate route before the event year is reported. Our wider US-UK tax accountants service covers ongoing dual filing, and our US tax services and UK tax services pages set out each side in detail.

Key takeaways

• An insurance payout above US basis creates a US gain even when the UK sees no gain or exempts it.
• Section 1033 defers the US gain only if the full dollar amount is reinvested in similar property within the replacement period and the election is made on the return.
• The UK taxes the receipt under section 22 and relieves it under section 23 where the money restores or replaces the asset, generally within one year of receipt.
• Timing and currency mismatches between the two systems are the main source of double taxation and unexpected US liabilities.
• Unfiled or incorrectly filed years can usually be corrected, but the election and credits must be built into the catch-up returns from the start.

If your UK home, let property or collection has been damaged, destroyed or stolen and a settlement is under way or already paid, the decisions made in the next few months will determine whether the gain is deferred or taxed twice. Speak to our specialists in confidence: contact our cross-border team for a confidential consultation and we will map the US and UK filings before you commit to a replacement.