Selling UK Property as a U.S. Citizen: CGT and IRS Rules
Selling a UK home involves two tax systems that don't see the same transaction the same way. The UK exempts most primary residence gains; the U.S. taxes them differently. Exchange rates, depreciation recapture, and a 60-day UK deadline add layers that catch many Americans off guard.
In this guide
- Two countries, one sale
- UK Capital Gains Tax
- Private Residence Relief
- Allowable costs
- The 60-day deadline
- U.S. tax on UK property
- Section 121 exclusion
- Depreciation recapture
- The exchange rate problem
- US forms required
- Avoiding double taxation
- Planning before you sell
- FAQ
Key facts at a glance
- UK CGT rates (residential, 2025/26)18% basic / 24% higher rate
- UK annual exempt amount£3,000 per person (frozen to 2030)
- UK 60-day deadlineReport and pay within 60 days of completion
- Section 121 exclusion$250k single / $500k MFJ
- Depreciation recapture rate25% flat — even if Section 121 applies
- US forms neededForm 8949, Schedule D, Form 1116, Form 4797
- Primary sourcesGOV.UK · IRS.gov (Pub. 523) · IRC §121
Two countries, one sale
When a U.S. citizen sells a property in the UK, the transaction sits at the intersection of two independent tax systems. HMRC has its rules. The IRS has its own, entirely separate rules. Neither system defers to the other, and the same sale can produce different gain calculations, different taxable amounts, and different tax bills depending on which side of the Atlantic is doing the arithmetic.
The good news is that double taxation on the same gain is specifically designed to be avoided — the Foreign Tax Credit mechanism allows U.S. citizens to offset UK capital gains tax paid against any U.S. liability on the same gain. Whether the credit fully eliminates the U.S. bill depends on the specific numbers, the type of property, and how long it was owned and used.
The complication is that the UK and U.S. calculations don't produce the same gain figure. Exchange rate movements between purchase and sale can make a sterling gain look larger in dollars. Depreciation claimed on rental property creates a separate U.S. tax obligation. And the timing mismatch between the UK's 60-day payment deadline and the U.S. annual return requires careful planning to align the Foreign Tax Credit correctly.
This guide covers the most common scenarios for Americans selling UK residential property — a primary home, a former home now rented out, or a rental property. The rules for commercial property, business assets, and inherited property have additional nuances not covered in full here. Professional advice from someone qualified in both UK and U.S. taxation is strongly recommended before completing any property sale.
Part 1: UK Capital Gains Tax
Current UK CGT rates and allowance (2025/26)
Capital Gains Tax on UK residential property is charged at 18% for basic rate taxpayers and 24% for higher and additional rate taxpayers. These rates apply to disposals from 6 April 2025 and reflect the increase introduced in the October 2024 Autumn Budget.
The Annual Exempt Amount is £3,000 per person for the 2025/26 tax year — a dramatic reduction from £12,300 just three years ago. It has been frozen at £3,000 until at least 2030. For a couple, each partner has their own £3,000 allowance — £6,000 combined if the property is jointly owned.
| Taxpayer type | UK CGT rate (residential) | Annual exempt amount |
|---|---|---|
| Basic rate (income + gain ≤ £50,270) | 18% | £3,000 per person |
| Higher rate (income + gain > £50,270) | 24% | £3,000 per person |
| Additional rate | 24% | £3,000 per person |
Note that your CGT rate is determined by adding the gain to your other taxable income for the year. If you are a basic rate taxpayer but the gain pushes your total income above £50,270, the portion of the gain above that threshold is taxed at 24%, not 18%.
Private Residence Relief
If you are selling your only or main UK home, you will typically qualify for Private Residence Relief (PRR). This exempts from UK CGT any gain attributable to the period you lived in the property as your main residence — plus an additional final nine months of ownership regardless of whether you were living there at the time of sale.
PRR is a powerful relief — for most straightforward sales of a home you lived in throughout ownership, the UK CGT bill is zero. Complications arise when you owned the property before moving in, rented out part of it, had uncovered periods of absence, ever owned more than one property, or used part of it for business. In these cases, PRR covers the proportion of your ownership during which the property was your main residence, and CGT applies to the remainder.
What reduces the UK gain
The UK taxable gain is: sale proceeds minus purchase cost minus allowable expenses. Allowable expenses include:
- Purchase price (or market value at 6 April 2015 if you bought before that date and elect to rebase)
- Stamp Duty Land Tax paid on purchase
- Legal fees on purchase and sale
- Estate agent fees on sale
- Capital improvement costs (extensions, conversions, structural work) — not routine maintenance or repairs
Maintenance, cleaning, decoration, and repairs are not allowable — they are revenue costs, not capital. This distinction catches many property owners out when they try to claim for work that reduced wear and tear rather than improved the property's value.
The 60-day reporting deadline
If you sell UK residential property and make a taxable gain, you must report it and pay any CGT due to HMRC within 60 days of completion. Missing it triggers an automatic £100 penalty, with additional penalties for extended delays. You report through HMRC's online UK property disposal service. This 60-day payment does not replace the Self Assessment tax return — you must also include the disposal in your annual return.
If you are not UK-resident at the time of sale, you are still subject to UK CGT on UK residential property. Non-residents must also report within 60 days of completion, even if no tax is due and even if the sale is at a loss. The obligation exists regardless of residency.
Purpose-built for Americans in the UK. Coordinates UK CGT and U.S. property sale reporting, including Form 8949, Schedule D and Foreign Tax Credit calculations for cross-border property sales.
Visit MyExpatTaxes →Part 2: U.S. tax on the UK property sale
From the IRS's perspective, a U.S. citizen selling a UK property is selling a foreign capital asset. The rules are substantively the same as selling a U.S. property — gains are taxable, long-term capital gains rates apply if the property was held for more than one year, and the primary residence exclusion under Section 121 is available.
Section 121: the primary residence exclusion
Section 121 of the Internal Revenue Code allows you to exclude from U.S. taxable income up to $250,000 of gain (or $500,000 for married couples filing jointly) from the sale of your principal residence. This exclusion applies to foreign property — your UK home qualifies provided you meet the tests.
To qualify, you must have owned the property for at least 2 of the 5 years before the sale, used it as your principal residence for at least 2 of those 5 years, and not claimed the Section 121 exclusion on another home sale in the previous 2 years. The two years do not need to be consecutive.
Why Section 121 matters for London properties: UK property prices, particularly in London and the South East, have risen substantially. A flat bought for £350,000 and sold for £750,000 produces a £400,000 gain — which at current exchange rates can easily exceed the $250,000 exclusion limit for a single filer. If the property also appreciated in dollar terms due to exchange rate movement, the U.S. gain can be larger than the UK gain.
Depreciation recapture — the hidden cost for former rentals
If you ever rented the property out and claimed depreciation deductions on your U.S. tax returns, that depreciation must be "recaptured" when you sell. The IRS taxes depreciation recapture at a flat 25% as ordinary income — even if you are otherwise eligible for the Section 121 exclusion on the capital gain itself.
This catches many Americans by surprise. The Section 121 exclusion reduces or eliminates the capital gain portion of the U.S. tax bill, but it does not eliminate depreciation recapture. If you claimed £50,000 of depreciation over your ownership, the equivalent dollar amount is taxable at 25% regardless of the exclusion.
The exchange rate problem
This is the aspect of UK property sales that creates the most unexpected U.S. tax bills — including, famously, for Boris Johnson, who was reportedly assessed U.S. tax on the 2009 sale of his North London home despite it being fully exempt from UK CGT under Private Residence Relief.
The IRS requires the entire transaction to be expressed in U.S. dollars, converted at the exchange rate applicable on each date. This means your purchase price uses the sterling/dollar rate on the date you bought, improvement costs use the rates on the dates they were incurred, and your sale proceeds use the rate on the date you sold.
If sterling appreciated against the dollar between your purchase and sale dates, your dollar-denominated gain will be larger than your sterling gain — sometimes significantly. Conversely, if sterling weakened, your U.S. gain may be smaller. Exchange rate movement is entirely outside your control.
Exchange rates used are illustrative. Sterling weakened from 2015 to 2026 in this example, making the dollar gain smaller than the sterling gain. If sterling had strengthened, the dollar gain would exceed the sterling gain. Allowable costs further reduce both calculations.
Mortgage currency gains
If you had a UK mortgage on the property, the IRS views repayment of a foreign currency mortgage separately. If it costs you fewer U.S. dollars to pay off the mortgage at completion than it cost to originally take it out (because sterling weakened), the difference is taxable as ordinary income — not capital gain. Conversely, if sterling strengthened and repaying the mortgage cost you more dollars, that foreign exchange loss is generally not deductible.
U.S. forms required
When reporting the sale of a UK property on your U.S. return, you will typically need:
- Form 8949 — Sales and Other Dispositions of Capital Assets. Report the sale here with dollar-denominated purchase price, sale proceeds, and allowable costs.
- Schedule D — Capital Gains and Losses. Aggregates the information from Form 8949 and applies the Section 121 exclusion.
- Form 1116 — Foreign Tax Credit. If you paid UK CGT on the gain, claim the credit here to offset U.S. tax on the same gain.
- Form 4797 — if the property was used as a rental, to report depreciation recapture.
UK CGT on a residential property sale is paid within 60 days of completion. U.S. capital gains are reported in the tax year of the sale. Where completion is in December and the 60-day payment falls in the following January, careful attention to which year the UK tax was paid is needed. Most expats use the accrual method, which aligns the credit with the year of the gain.
How double taxation is avoided in practice
For the sale of a rental property where PRR does not apply, the mechanics are relatively clean: you calculate and pay UK CGT (18% or 24%), calculate the U.S. gain in dollars, apply long-term capital gains rates (0%, 15%, or 20%), then claim the Foreign Tax Credit on Form 1116 for the UK CGT paid. Because UK CGT rates are generally at or above U.S. long-term capital gains rates for higher earners, the credit typically eliminates or substantially reduces the U.S. liability.
For the sale of a primary home where UK PRR fully exempts the gain, no UK CGT is paid — meaning there is no foreign tax credit to offset any U.S. liability. The Section 121 exclusion does the work on the U.S. side. If the U.S. gain exceeds the exclusion limit, the excess is subject to U.S. capital gains tax with no offsetting credit, because the UK did not tax it either.
Matched with a CPA experienced in cross-border property sales, Form 8949, Foreign Tax Credit, and depreciation recapture for Americans in the UK. Suitable for complex situations including former rentals and large gains.
Visit Taxfyle →Planning considerations before you sell
Check the Section 121 two-year window
If you have rented out your former home and are considering selling, confirm whether you still meet the two-year use test within the five-year window. If you moved out of your primary residence more than three years ago, you may no longer qualify for the exclusion. Timing the sale before the three-year mark from your move-out date is one of the most valuable planning steps available.
Consider ownership structure for US-UK couples
If you are a U.S. citizen married to a non-U.S. citizen, the ownership structure of the property has significant planning implications. A non-U.S. spouse owning a larger share of the property reduces the gain attributable to the U.S. citizen. Transfers between spouses in the UK are made at no gain/no loss for UK CGT purposes. Planning the beneficial ownership split before a sale — not after — is significantly more effective.
Time the sale relative to your income year
If your UK income is variable — for example, you are expecting a lower-income year due to a career change, parental leave, or a gap between jobs — selling in that year may reduce your UK CGT rate from 24% to 18%, and may also place more of any U.S. gain in the 15% or even 0% long-term capital gains bracket.
Keep meticulous records
Both HMRC and the IRS can ask you to substantiate the gain calculation years after the sale. Keep: original purchase completion statement, receipts for all capital improvements, sale completion statement, and evidence of any periods of main-residence use such as utility bills, council tax records, and GP registration.
U.S. tax software with an expat-specific flow. Handles foreign property sales, Form 8949, Schedule D, and the Foreign Tax Credit for straightforward situations. Complex cross-border property sales with depreciation recapture are better handled by a specialist CPA.
Visit TurboTax →Selling a UK property as an American is one of those situations where the complexity is not obvious until you're already in the middle of it. The UK side tends to get resolved first — HMRC's 60-day deadline forces the issue — but the U.S. side follows behind, with its own gain calculation in a different currency, its own exclusion limits, and its own forms. The two calculations rarely produce the same number, and the gap between them is where the surprises usually live.
What makes this genuinely difficult is that the most consequential decisions — how the property is owned, whether to time a sale before the three-year mark, whether depreciation was claimed on a rental period — all have to be made before completion, not after. By the time most people consult a professional, the options have already narrowed. The earlier the advice, the more of the planning opportunity is still available.
If you're approaching a sale, or even considering one in the next couple of years, that's the right time to have the conversation — not after the contracts are signed.
Disclaimer: This guide is for general information only and does not constitute tax, legal or financial advice. UK CGT and U.S. capital gains rules for property sales are complex, fact-specific, and subject to change. Exchange rate calculations, depreciation recapture, non-qualified use periods, and ownership structure planning require professional advice from advisers qualified in both UK and U.S. taxation. Rates and allowances are correct for the 2025/26 UK tax year and 2025/2026 U.S. tax year as of March 2026.
Frequently asked questions
Possibly. The UK's Private Residence Relief does not carry through to the U.S. The IRS has its own exclusion — Section 121 — which covers up to $250,000 of gain for single filers and $500,000 for married couples filing jointly. If your U.S. dollar gain is within those limits, no U.S. tax applies. If it exceeds the limits, the excess is subject to U.S. capital gains tax. Because there is no UK tax to claim as a Foreign Tax Credit on a PRR-exempt sale, the full U.S. tax applies to any excess.
Convert each element of the calculation using the exchange rate applicable on the date of each transaction. The purchase price uses the sterling/dollar rate on the date you completed the purchase. Improvement costs use the rates on the dates they were paid. The sale proceeds use the rate on the date you completed the sale. The IRS accepts the U.S. Treasury year-end rate for the relevant year, or the spot rate on the specific date — whichever you use, apply it consistently and keep records showing your method.
The 60-day rule is a UK requirement. You must report and pay any UK CGT due to HMRC within 60 days of the completion date of the sale. It does not change your U.S. filing obligation, which remains part of your annual tax return for the year of sale. However, the timing matters for the Foreign Tax Credit — you need the UK tax to have been paid in the same tax year as the U.S. gain is reported for the credit to be claimed correctly.
It may, but the exclusion is reduced. If you rented the property out for a period after 2008 and then lived in it as your main residence, that rental period is "non-qualified use" and reduces the proportion of the exclusion available to you. Additionally, any depreciation you claimed during the rental period must be recaptured at 25% — this is a separate obligation that the Section 121 exclusion does not eliminate.
Yes, if sterling has weakened against the dollar since your purchase, your U.S. dollar gain will be smaller than your sterling gain — potentially significantly so. If your purchase price in dollars was high because sterling was strong at purchase, and your sale proceeds in dollars are lower because sterling is weaker at sale, you might show a smaller U.S. gain than UK gain, or in extreme cases a U.S. loss despite a UK gain. Exchange rate movement cuts both ways and depends entirely on the rates at the specific dates of your transactions.
It can. If the property is jointly owned and you sell while married, the married filing jointly Section 121 limit of $500,000 applies if both spouses have used the property as their principal residence for the required period. Your non-citizen spouse's share of the gain is not subject to U.S. tax. Planning the beneficial ownership split so that more of the property is in the non-U.S. spouse's name can reduce the gain attributed to you as the U.S. citizen — most effectively when planned before the sale, ideally well in advance.
Generally yes, if there is a taxable gain before exclusion or if depreciation was ever claimed. If the gain is fully excluded under Section 121 and no depreciation was claimed, some taxpayers do not file Form 8949 — but given the exchange rate complexities on UK property sales, most experienced expat tax advisers recommend reporting the sale to create a complete record, even when no U.S. tax is due.
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