Selling a property in another country is two problems wearing one name: the sale itself, under local law, and bringing the proceeds home without losing a chunk to tax you did not plan for or an exchange rate you did not shop.
If you are a UK tax resident, you owe UK capital gains tax on a property sold anywhere in the world — even when you have already paid tax on the same gain locally. Most of what follows is about not paying it twice.
The quick answers
- Do I pay UK tax on a property sold abroad? Yes, if you are UK tax resident. The gain is reported on your Self Assessment.
- Will I be taxed twice? Normally no. A double taxation agreement usually lets you credit the foreign tax against the UK bill, but you have to claim it.
- When do I report it? In the tax year of the sale, on your Self Assessment. Unlike a UK residential sale, there is no 60-day reporting window for a foreign property.
- How do I get the money home? Not through your bank’s default rate. The spread on a six-figure transfer is the largest avoidable cost of the whole sale.
- What if I still have a mortgage on it? It is settled at completion out of the proceeds, and the currency you owe it in matters.
Do you pay UK tax when you sell a property abroad?
Yes, if you are UK tax resident at the time of the sale. The UK taxes residents on worldwide gains, so a flat in Alicante is treated like any other chargeable asset.
The gain is the sale price minus what you paid, minus the costs of buying and selling and any capital improvements. Legal fees, agent commission and the purchase tax you paid on the way in all reduce the gain. Routine maintenance does not. HMRC’s guidance on capital gains for non-UK assets sets out what qualifies.
Two points that catch people out. First, the gain is calculated in sterling, using the exchange rate at purchase and the rate at sale — so currency movement can create a taxable gain even when the property sold for the same number of euros you paid for it. Second, if the property was ever your only or main home, Private Residence Relief may apply for the period it was, which can materially cut the bill.
Our guide to calculating UK capital gains tax on overseas property works through the arithmetic.
“If you sold the property abroad which was your only residence then you should not incur any capital gains tax. Did you live in the property?”
— r/UKPersonalFinance
That reply asks the right first question, and it is the one most sellers skip.
What does the local tax authority take first?
The country where the property sits taxes the sale before the UK sees it, and it usually withholds the money at completion rather than trusting you to pay later.
| Where | What happens at the sale |
|---|---|
| Spain | The Spanish tax agency requires the buyer to withhold 3% of the sale price and pay it over on account of the gain. If the actual liability is lower you reclaim the difference; if higher, you pay the balance. There is also plusvalía municipal, a local tax on the increase in land value. |
| Portugal | Capital gains on a property sale are declared to the Portuguese tax authority; non-residents are taxed on the gain, and the rules for reinvestment relief differ from those for residents. |
| France | A prélèvement is withheld at the sale under French tax rules, and a fiscal representative may be required above a value threshold. |
| UAE | No capital gains tax on property, which means the UK is the only tax authority with a claim. |
Rates and thresholds change; confirm with the local authority or a local adviser before the sale, not after.
The consequence is cash flow: you can hand over the property and watch 3% of the price go straight to a foreign tax office, with the reclaim arriving months later. Budget for the gap.
How do you avoid being taxed twice?
You claim Foreign Tax Credit Relief on your Self Assessment. The UK has double taxation agreements with Spain, Portugal, France and most other markets, and the mechanism is a credit rather than an exemption: you calculate the UK liability on the gain, then set the foreign tax already paid against it.
If the foreign tax was higher than the UK bill, the credit wipes out the UK liability but HMRC does not refund the excess. If it was lower, you pay the difference. Either way the total is roughly the higher of the two, not the sum.
The claim is not automatic. It has to be made, with evidence of the foreign tax paid, and the deadline is the one for the return itself. HMRC’s guidance on relief for foreign tax paid covers the mechanics.
Keep the completion deed, the local tax receipt and proof of the withholding — with a translation if HMRC asks.
When do you have to report it?
In the tax year of the sale, through Self Assessment — by 31 January following the end of that tax year.
This is one place where a foreign property is treated more leniently. A UK residential sale requires a separate return and payment within 60 days of completion; a foreign property does not. The gain goes on the annual return like any other.
Register for Self Assessment early if you are not already in it — and note that the sale is exactly the kind of event HMRC hears about from the other side under automatic exchange of information.
How do you get the money back to the UK?
This is where the largest avoidable cost of the sale usually sits, and it is not tax.
A six-figure euro balance converted at a bank’s retail rate can cost several times what the same transfer costs through a specialist. The cost is rarely a fee — it is the margin inside the exchange rate, which is why a “no fee” offer tells you almost nothing. Compare the rate you are quoted against the mid-market rate on the day; the Bank of England’s published spot rates are a neutral reference.
Three things worth deciding before completion rather than after:
Timing. You are exposed to the euro-sterling rate between completion and conversion. If the number matters to a UK purchase, a forward contract fixes it; if it does not, waiting is a bet.
Route. A specialist provider, your own bank, or a currency broker. For a sum this size the gap between best and worst is usually the biggest line after tax.
Where the money lands first. A local account in the sale country makes completion simpler and lets you convert on your own timetable rather than the notary’s.
What if the property still has a mortgage on it?
It is settled at completion out of the proceeds, before anything reaches you: the lender provides a redemption figure and the notary or solicitor handles it. Two things to check. Early repayment charges — a Spanish fixed-rate mortgage can carry a compensation fee for early redemption, capped by law but not zero. And the currency of the debt: if you financed a euro property with a sterling mortgage against your UK home, selling the property does not clear that loan, and you are converting euros back to pay down sterling.
If you are selling one overseas property to buy another, the financing question restarts from scratch — and the proceeds usually matter more than the mortgage. Across Upscore’s Spanish applications the median deposit is 22.7% of the purchase price (n=6,243), while the median loan-to-value requested is 75% (n=1,943): most buyers are short of what their own request needs, and a sale is the most common way that gap gets closed. See can you get a mortgage on a property abroad and which UK banks offer overseas mortgages.
Frequently asked questions
Do I need to declare an overseas property sale to HMRC if I made a loss?
Report it anyway. A loss can be set against other gains in the same year or carried forward, and it only counts if HMRC knows about it.
Do I pay tax in both countries?
Both have a claim, but a double taxation agreement means you should not pay the full amount twice. You claim Foreign Tax Credit Relief on the UK return.
How is the gain calculated if the currency moved?
In sterling, at the exchange rate on the day of purchase and the day of sale. This can produce a taxable gain even on a sale at the original euro price.
What if I am selling in order to buy somewhere else abroad?
The two transactions are separate for UK tax, but the cash timing links them: see mortgages in Spain for non-residents and the cost calculator for what the next purchase needs in cash.
Can I avoid the 3% Spanish withholding?
No — the buyer is legally required to withhold it from a non-resident seller. You reclaim any excess after filing the Spanish return.
Does selling change my UK tax residence?
No. Residence is determined by the Statutory Residence Test, not by what you own. But if you are planning to leave the UK, the order of the two events matters and is worth advice.
The bottom line
The tax is manageable and mostly predictable. The two things that cost people real money are the ones that feel administrative: not claiming Foreign Tax Credit Relief, and converting a six-figure balance at whatever rate the bank offered on the day.
Sort the currency route before completion, keep every local tax document, and put the sale on the right year’s return.
If the sale is funding a purchase in Spain, Portugal or the UAE, Upscore’s Finance Passport shows which banks will approve your profile once you have a property in mind. It is free and takes under fifteen minutes.
