How to Calculate Capital Gains Tax on Sale of Foreign Property UK

Selling a property abroad often feels like a foreign transaction, but for UK tax residents it can trigger a very real UK tax bill. If you are UK resident for tax purposes, disposing of a villa in Portugal, an apartment in Dubai or a flat in Pakistan can bring you within UK Capital Gains Tax, regardless of where the sale proceeds end up.

For 2026/27, individuals generally get a £3,000 Annual Exempt Amount, with gains above that taxed at 18% or 24% depending on your income. Where tax has already been paid overseas on the same gain, Foreign Tax Credit Relief can often prevent double taxation.

One factor many sellers overlook is currency conversion. Because the purchase price, sale proceeds and costs are each converted into sterling using the exchange rate at the time of that specific transaction, a modest profit in local currency can translate into a much larger taxable gain once currency movements are factored in. This guide walks through exactly how HMRC expects the calculation to be done, what reliefs are available and how to report the sale correctly.

Do UK Residents Pay Capital Gains Tax on Overseas Property?

If you are UK tax resident, you are generally liable to UK CGT on gains from property held abroad, and keeping the money offshore does not change that position because the gain arises on disposal, not on repatriation of funds. Non UK residents are generally outside the scope of UK CGT on foreign property, although temporary non residence rules can still bring certain gains back into charge if you return to the UK.

There is a notable exception for people who have recently relocated to the UK. Under the four year Foreign Income and Gains regime introduced from 6 April 2025, qualifying individuals who were non UK resident for at least the previous ten consecutive tax years can claim relief on eligible foreign gains during their first four UK resident tax years. Whether you count as UK resident at all depends on the Statutory Residence Test, which weighs factors such as days spent in the UK, your home, work patterns and other UK ties.

Step by Step: Calculating CGT on an Overseas Property Sale

Step 1: Gather Your Records

Start by pulling together the original purchase price and date, the sale price and disposal date, transfer taxes, legal and agent fees, and invoices for any genuine capital improvements. Keep each figure and its date separate, since different exchange rates will apply to each one.

If the property was inherited, your acquisition value is normally its market value at the date of death rather than what the original owner paid, and any value already agreed for Inheritance Tax purposes will usually carry across to the CGT calculation.

Step 2: Convert Each Amount Into Sterling Separately

HMRC requires the gain to be calculated in pounds, with each part of the transaction converted at the rate applying on that specific date, rather than converting a single net figure calculated in the foreign currency.

Consider a higher rate taxpayer who bought a Malaga flat in June 2016 for €260,000, spent €26,000 on purchase costs and €29,000 on a genuine extension in 2021, then sold it in July 2026 for €348,000 after €17,400 of agent and legal fees. Converting each leg at its own historic rate produces sale proceeds of roughly £300,000 against total base costs of around £245,000, giving a chargeable gain before reliefs of about £40,000, even though the net increase measured purely in euros was only around €15,600.

That gap is significant. Someone who mistakenly converted the euro net gain at the sale date rate alone might calculate a gain of only around £13,448, producing tax of roughly £2,508 at 24%. Done correctly, the same sale produces a £37,000 taxable gain after the Annual Exempt Amount and a CGT liability of about £8,880, a difference of over £6,000 on a single property.

Step 3: Deduct Only HMRC Approved Costs

Not every property related expense reduces your gain. Allowable deductions typically include the purchase price or probate value, qualifying purchase taxes and conveyancing fees, professional fees connected with buying or selling, and genuine capital improvements still present at sale. Building an extension can qualify, while routine repairs, decorating or replacing worn fittings generally will not.

Mortgage interest, arrangement fees and any costs already claimed against rental income cannot normally be deducted a second time against the capital gain. Proper invoices matter here, since simply labelling a cost as refurbishment is not sufficient evidence of a qualifying capital improvement.

You should also check available reliefs before finalising the figure. Private Residence Relief may apply if the property was genuinely your main home, though if neither you nor your spouse is tax resident in that country, a 90 day rule under sections 222A to 222C of TCGA 1992 requires at least 90 overnight stays there in the relevant tax year for it to count. Capital losses can also be offset, and transfers between spouses or civil partners are usually free of an immediate CGT charge if genuine ownership passes before the sale.

Step 4: Apply the Annual Exempt Amount and Correct Rate

Once losses and reliefs are deducted, apply the £3,000 Annual Exempt Amount for 2026/27, noting that it is unavailable if you are claiming the Foreign Income and Gains regime or Overseas Workday Relief for that year. The remaining gain is taxed at 18% within any unused basic rate band and 24% above it.

Using the Malaga example, a £40,000 gain less the £3,000 exemption leaves £37,000 taxable, giving CGT of £8,880 at 24% before any Foreign Tax Credit Relief. Where a property is jointly owned, each owner calculates their own share separately, applying their own losses, exemption and income position, so two co owners can end up with quite different bills on the same sale.

Foreign Tax Credit Relief: Avoiding Double Taxation

Because a foreign property sale can be taxed both overseas and in the UK, Foreign Tax Credit Relief exists to prevent the same gain being taxed twice. Under the relevant Double Taxation Agreement, or under unilateral relief in Part 2 of TIOPA 2010 where no treaty exists, HMRC caps the credit at the lower of the foreign tax paid or the UK tax attributable to that gain.

So if UK CGT on a sale is £8,880 and £2,555 of qualifying foreign tax has already been paid, the credit is normally limited to £2,555, leaving £6,325 due to HMRC. If foreign tax exceeds the UK liability, the UK bill can fall to nil, but the excess is not refunded or usable against other gains. Foreign gains and this relief are generally reported through the SA106 foreign pages, supported by HS263 calculations where needed, and it is worth retaining the foreign tax assessment and proof of payment even though these are not normally submitted with the return.

Reporting an Overseas Property Sale to HMRC

Overseas property gains are reported through Self Assessment rather than the 60 day UK property return, which applies only to UK land disposals. The relevant forms are typically SA108 for the capital gain itself and SA106 where foreign tax and credit relief are involved.

For a sale completed in July 2026, the gain falls into the 2026/27 tax year, meaning the standard online filing and payment deadline is 31 January 2028, with registration for Self Assessment required by 5 October 2027 if not already registered. If you fall under Making Tax Digital for Income Tax, the gain is included at year end through compatible software rather than through quarterly property updates, and the 60 day return still does not apply.

Selling After Moving Abroad

Leaving the UK does not automatically remove a property gain from UK CGT. Temporary non residence rules can pull certain gains back into charge on your return if you were UK resident in at least four of the seven tax years before departure and your period abroad does not exceed five years. Assets bought and sold entirely during a genuine period of non residence are generally excluded, subject to specific exceptions, but property owned before leaving the UK remains a common trap for people on short overseas assignments.

How UK Property Tax Accountants Can Help

Foreign property sales combine currency conversion, overseas tax rules and UK reporting deadlines, and getting any one element wrong can lead to an inflated bill or a penalty. Here is how our team supports clients through this exact scenario.

• We recalculate your gain using the correct sterling conversion method for each transaction leg, rather than a single blended rate that can distort the figures
• We identify and apply every allowable cost and relief you are entitled to, including Private Residence Relief and capital losses
• We assess your eligibility for Foreign Tax Credit Relief and calculate the correct credit under the relevant treaty or TIOPA 2010 provisions
• We prepare and file your SA108 and SA106 forms accurately, avoiding the common mistake of using the 60 day return for an overseas sale
• We review your residence position under the Statutory Residence Test and temporary non residence rules if you have recently moved abroad or returned to the UK
• We advise clients who may qualify for the four year Foreign Income and Gains regime following a recent move to the UK
• We help joint owners calculate their individual shares of the gain correctly, based on their own allowances and income
• We liaise directly with HMRC on your behalf if queries arise around offshore disposals reported under the Common Reporting Standard

Frequently Asked Questions