If you live abroad and sell a property in the UK, you have just 60 days from completion to report the sale to HMRC and pay any capital gains tax due. Miss it, and automatic penalties start immediately, even if it turns out you owe no tax at all. This catches non-residents constantly, because the rule is stricter than the one for people living in the UK, the clock is short, and many sellers do not even know the obligation exists until the penalty letter arrives. The good news is that with a little preparation the tax itself is often lower than people fear, thanks to a valuable rebasing rule, and the deadline is entirely manageable. This guide explains how non-resident capital gains tax works when you sell UK property in 2026, how to reduce the gain, and how to stay the right side of the deadline. It is a starting point for understanding your position, not personal tax advice.
This is the single most important thing to know, and the thing most non-residents get wrong. When you sell UK residential property, you must file a return and pay any capital gains tax due within 60 days of the completion date, not the exchange date, through HMRC's online UK Property Account. The deadline is short, it runs from completion, and it applies whether or not you also file a UK self-assessment return, which is a separate annual filing. Non-residents are caught by this far more often than UK residents, for two reasons: many do not know the obligation exists at all, having been abroad for years, and the 60 days can pass quickly amid the practicalities of a sale from overseas. The account can be accessed from anywhere in the world, so being abroad is no barrier to filing, but you do need to know to do it, and to have the figures ready. The right time to prepare is before completion, not after.
This is the trap within the trap. For non-residents, the obligation to file a 60-day return on a UK property disposal applies even where there is no gain, or even a loss. This is a stricter rule than the one that applies to UK residents, who generally only need to file when tax is actually due. So a non-resident who sells at a loss, or whose gain is fully covered by reliefs, may wrongly assume there is nothing to report, and still receives a penalty for failing to file. If you are non-resident and you dispose of UK property, assume you have a 60-day filing obligation regardless of the tax outcome, unless you have confirmed otherwise. The only broad exception is where reliefs, such as Private Residence Relief, eliminate the chargeable gain entirely, in which case there is no chargeable gain and no return is required, but that is a narrower situation than many assume.
Here is the good news that offsets the deadline pressure. Non-residents have only been within the UK capital gains tax net on residential property since 6 April 2015, and on all UK property since 6 April 2019. Because of this, if you owned a residential property before 6 April 2015, you can usually rebase to its market value on 5 April 2015, so that only the growth in value since April 2015 is taxed, rather than the growth over your entire ownership. For non-residential property and indirect disposals, the default rebasing date is 5 April 2019 instead. Other computational elections, such as time apportionment of the whole-period gain, may also be available, so the method is not always simply growth since 2015 and should be chosen carefully. For a property bought many years ago that had already risen substantially in value by 2015, rebasing can reduce the taxable gain dramatically. To take one illustration, a property bought in 2010 for £150,000, worth £220,000 in April 2015 and sold for £300,000, could see its taxable gain fall from £150,000 to £80,000 through rebasing. The election is made at the time of disposal, and it requires reliable evidence of the April 2015 value, which is why obtaining a proper retrospective valuation is worth doing.
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Non-residents pay capital gains tax on UK residential property at the same rates as residents: 18% where the gain falls within your unused basic rate band, and 24% above it. For non-residential property, the current individual rates should be checked at the time of sale, as the rules in this area have changed. The gain itself is the sale proceeds, less the base cost (either the original cost or the April 2015 value if you rebase a residential property), less allowable costs such as the buying and selling expenses and the cost of genuine capital improvements, though not repairs and maintenance. Everyone has a small annual exempt amount, £3,000 for 2026-27, which has been cut sharply in recent years and no longer shelters much. If the property was ever genuinely your main home, Private Residence Relief can cover the period you lived in it plus the final nine months of ownership, but not the years you were away, and lettings relief is now very restricted, generally applying only where you shared the property with your tenant. Working the gain out properly, with the right base cost and reliefs, is where the real tax saving sits.
HMRC applies penalties for a late 60-day return automatically, and they begin after the deadline passes. Broadly, a late return attracts an initial £100 penalty, with further penalties if the delay continues, and interest runs on any tax paid late at HMRC's published late-payment rate. Crucially, these penalties apply even where no tax was ultimately due, because it is the failure to file on time that is penalised, not the tax. HMRC rarely accepts not knowing about the rule as a reasonable excuse, which is precisely the position many non-residents find themselves in. The deadline is genuinely unforgiving, and the practical lesson is to treat the 60-day clock as starting the moment your sale completes, and ideally to have the reporting prepared in advance so filing is a formality rather than a scramble.
Selling UK property does not only concern the UK. The country you now live in may also tax the gain, under its own rules, which raises the question of double taxation. Whether and how relief is available depends on the double tax treaty between the UK and your country of residence, and treaties vary. Some give the UK the primary right to tax gains on UK land, with your country of residence giving credit for the UK tax paid; others work differently. For someone in a country with no capital gains tax, such as the UAE, the UK tax may be the only charge, but the position should still be checked rather than assumed. Because the interaction genuinely depends on the specific treaty and your circumstances, and because the numbers on a property sale are usually large, this is an area where getting advice on both sides, before completion where possible, is well worth it.
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The most common and most penalised mistake. The clock starts at completion and runs fast, and being abroad is not an excuse HMRC accepts. Many non-residents simply do not know the obligation exists. Assume the 60-day duty applies to any UK property sale and prepare before completion.
For non-residents, the report is required even if you made a loss or owe nothing. Assuming that a break-even or loss-making sale needs no filing is exactly how people end up with penalties despite owing no tax. File regardless, unless you have confirmed no return is due because reliefs eliminate the chargeable gain.
If you owned a residential property before April 2015, rebasing can cut the taxable gain dramatically, but the election is made at disposal and needs credible evidence of the 5 April 2015 value. Failing to rebase, or trying to and having no valuation to support it, means paying more tax than necessary.
The 60 days runs from completion, but people sometimes anchor on the exchange date or the date the money arrives, and miscount. Know your completion date and count from there.
Focusing only on the UK tax and forgetting that your country of residence may also tax the gain, or that a treaty affects the outcome, can lead to double taxation or a nasty surprise at home. Check both sides.
Sarah had moved to Dubai eight years earlier and had kept her Bristol house, letting it out. She decided to sell, and completion went through in the spring. She assumed that because she lived abroad and paid no tax in the UAE, UK tax was not really her concern, and in any case she planned to sort out any tax when she next thought about UK filing. She had not heard of the 60-day rule.
Fortunately she took advice shortly after completion, with time still on the clock. Two things emerged. First, she did have a 60-day reporting and payment obligation, and the deadline was real and close. Second, because she had bought the property in 2007, well before April 2015, rebasing to its 5 April 2015 value cut her taxable gain substantially, since much of the growth had happened before 2015. A retrospective valuation was obtained to support the election, her gain and tax were calculated with the correct base cost and reliefs for the period she had lived there, and the return was filed and the tax paid within the 60 days.
Sarah met the deadline, avoided the automatic penalties she had been days away from incurring, and paid materially less tax than she would have without rebasing. What could have been a penalty and an overpayment became a clean, correctly calculated filing.
Illustrative example, not a real client.
Clarity Global Wealth helps non-residents sell UK property without falling into the 60-day trap or paying more tax than they need to. The most valuable help comes before completion: establishing that you have a reporting obligation, working out the gain with the correct base cost and reliefs, deciding whether to rebase to the April 2015 value and obtaining the valuation to support it, and making sure the return is filed and the tax paid inside the 60 days. Because a UK property sale also interacts with the tax rules of the country you now live in and the treaty between them, we look at both sides so you are not caught by double taxation or an unexpected charge at home. We coordinate with the right UK and local tax specialists where the detail requires it. The aim is a sale that is reported correctly and on time, with the tax kept to what is genuinely due and not a pound more.
This guide is provided for general information only and reflects our understanding of the rules as at the date of publication. It is not personal financial, investment, pension or tax advice, and should not be relied upon as such. Rules and tax treatment can change and depend on your individual circumstances and country of residence. You should always seek regulated advice specific to your situation before taking action.
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