Introduction: Why a Second Home in Britain Changes Your Tax Position
Buying a second home in Britain is one of the most expensive lifestyle decisions an American can make, and most of the cost never appears on the estate agent's particulars. A London pied-à-terre or a Cotswolds cottage triggers up to 7 percentage points of stamp duty surcharges on the way in. Furthermore, it can quietly make you a UK tax resident, costs double council tax in most of England, and produces a US gain with no home-sale exclusion on the way out.
At TaxYork, we prepare US and UK returns for American investors, bankers and company owners who divide their year between New York, London and the countryside. In our experience, buyers plan the purchase itself carefully and then ignore the tax consequences of owning it. Consequently, the second home that was meant to be a retreat becomes the reason HMRC taxes their worldwide income.
This guide covers both sides of the Atlantic. First, it explains the purchase taxes and why none of them earns a US credit. Next, it sets out the Statutory Residence Test trap, then the running costs, the letting rules, the US mortgage interest position and the sale. Finally, it walks through a full case study with real numbers.
What Counts as a Second Home for UK and US Tax
A second home is any residence you own in addition to your main home, and the two tax systems test that status in different ways. HMRC looks at your worldwide property when it charges stamp duty, so your American house makes a British flat an additional dwelling. Similarly, the UK capital gains rules let you choose which of two homes is your main residence.
The IRS, by contrast, applies a facts-and-circumstances test to decide your principal residence. It then allows you to treat one other residence as a qualified home for mortgage interest. Therefore, the same property can be a main home for one country and a second home for the other, and every mismatch has a price.
Who This Guide Is For
This guide addresses two groups. The first is the US-resident American who buys a British property for regular visits, business trips and summers. The second is the American already living in Britain who adds a country house, a coastal cottage or a flat in Edinburgh. Both groups face the same purchase taxes, but the residence and gains rules bite them very differently.
The Purchase Taxes on a Second Home in Britain
The single largest cost of a second home in England is Stamp Duty Land Tax, and wealthy American buyers usually pay it at the highest possible rates. The standard residential SDLT rates run from 0% to 12%, with the top band starting at £1.5 million. However, two surcharges then sit on top of every band.
The 5% Higher Rates for Additional Dwellings
The higher rates add 5 percentage points to each band when you already own a residential property anywhere in the world. Your American home counts, even if it is your only other property. Notably, married couples and civil partners are treated as one unit, so a house in your spouse's name in Connecticut also makes the British purchase an additional dwelling.
The higher rates carry a refund route for buyers replacing a main residence. However, that route never helps with a genuine second home, because you are not replacing anything. As a result, the 5% surcharge on a holiday property is permanent.
The 2% Non-Resident Surcharge
The non-resident surcharge adds a further 2 percentage points when you were not present in the UK for at least 183 days in a continuous 365-day window around completion. Importantly, this is not the Statutory Residence Test. You can reclaim the charge within two years if you later meet the 183-day condition, and our guide to reclaiming the stamp duty surcharge explains that process in detail.
Together, the two surcharges push the top rate to 19%. For example, an individual buying a £2 million second home pays £153,750 at standard rates plus £140,000 in surcharges, a total of £293,750. That is an effective 14.7%, not the flat 17% that several buyer guides wrongly quote; the 17% flat rate applies only to companies. You can model your own figures with our UK stamp duty calculator.
Scotland and Wales Work Differently
Scotland replaces SDLT with Land and Buildings Transaction Tax, and its Additional Dwelling Supplement is 8% of the whole price. Wales charges Land Transaction Tax with a separate higher-rates table running from 5% to 17%. Notably, neither country charges a non-resident surcharge. Consequently, a Highland estate or a Pembrokeshire cottage can cost less in purchase tax than a similar English property, although the supplement rates themselves are higher.
Why Stamp Duty Earns No US Credit
Stamp duty is a transaction tax, not an income tax, so the IRS will not allow a foreign tax credit for it. Moreover, it is not deductible as a property tax. Instead, you add it to your US cost basis under the rules in IRS Publication 551 on basis of assets. The £293,750 in our example therefore reduces your eventual US gain, but it does nothing for your tax bill in the year you buy.
The Statutory Residence Test: How a Second Home Makes You UK Resident
The most dangerous consequence of a second home in Britain is invisible at completion. HMRC decides UK tax residence under the Statutory Residence Test, and owning a British home adds weight to every day you spend there. If you become UK resident, HMRC taxes your worldwide income, including your American salary, bonus and investment gains.
The Accommodation Tie
The accommodation tie applies when you have a place to live in the UK that is available for a continuous 91 days in the tax year, and you spend at least one night there. A second home you own meets that test almost automatically. Furthermore, short gaps of fewer than 16 days do not break the 91-day period, so letting it out for a fortnight does not help.
HMRC's own guidance, RDR3 on the Statutory Residence Test, sets out the tie in full. In our experience, the accommodation tie is the one tie that wealthy Americans create for themselves without realising it.
How Many Days You Can Actually Spend
The number of ties you hold decides how many days you can spend in Britain before you become resident. If you were not UK resident in any of the previous three tax years, you are an arriver. An arriver with four ties becomes resident at 46 days, with three ties at 91 days and with two ties at 121 days. Otherwise, 183 days makes anyone resident automatically.
An arriver counts four ties: family, accommodation, work and the 90-day tie. The work tie applies once you work more than three hours on at least 40 UK days. Similarly, the 90-day tie applies if you spent more than 90 days in the UK in either of the two previous tax years. Therefore, a banker with a London flat, regular London meetings and a busy prior year can hold three ties and become resident at just 91 days.
The Home Test and the Full-Time Work Test
The third automatic UK test catches owners whose only home is British. It applies when you have a UK home for at least 91 consecutive days and either no overseas home or an overseas home where you spend fewer than 30 days in the year. Consequently, keeping and genuinely using your American home is essential protection.
In contrast, the third automatic overseas test protects Americans who work full time in the United States. You are automatically non-resident if you average at least 35 hours a week abroad, spend fewer than 91 days in the UK and work more than three hours on fewer than 31 UK days. For a senior executive, managing UK workdays is often easier than managing total days.
What UK Residence Costs an American
UK residence does not remove your US filing obligation, because America taxes its citizens wherever they live. Instead, you file in both countries and claim credits under the treaty. Our tax treaty optimisation work focuses on precisely this overlap. However, a newly arrived American who has not been UK resident in the previous ten years can use the four-year foreign income and gains regime, which softens the first years. Beyond that window, UK rates of up to 45% on income apply to everything.
Owning a Second Home: Council Tax, Surcharges and Running Costs
Once you own a second home, the annual costs arrive quickly, and none of them reduces your US tax bill. Council tax is the main charge, and English councils have had new powers since April 2025.
The Council Tax Second Home Premium
Since 1 April 2025, councils in England can charge a premium of up to 100% on a furnished property that is nobody's main residence. The government's page on council tax for second homes and empty properties confirms the rule. Most councils in popular areas, including Cornwall, the Cotswolds and much of London, now double the bill.
Wales has allowed premiums of up to 300% since April 2023, and several Welsh councils charge well above 100%. Scotland introduced its own 100% premium from April 2024. As a result, a Band H property that once cost £3,100 a year can now cost more than £6,000 as a second home.
The High Value Council Tax Surcharge From 2028
The government has also announced a High Value Council Tax Surcharge for English homes worth £2 million or more from April 2028. The published bands run from £2,500 a year above £2 million to £7,500 above £5 million, based on a 2026 revaluation. Notably, the high value council tax surcharge consultation proposes charging owners rather than occupiers, which matters when you let the property.
Why the IRS Ignores Council Tax
Council tax on a personal-use second home earns no US deduction and no foreign tax credit. Section 164(b)(6) bars any itemised deduction for foreign real property taxes, and the One Big Beautiful Bill Act did not reverse that rule. Our article on the SALT cap and UK council tax explains the two narrow exceptions: rental use and the foreign housing exclusion. For a US-resident owner, neither exception usually applies.
Letting a Second Home: UK Income Tax and the US 14-Day Rules
Many owners let their second home for part of the year to offset its costs. However, the UK and US apply opposite rules to short lets, and a few weeks of income can create tax in one country that the other ignores.
How Britain Taxes the Rent
HMRC taxes UK rental income wherever the owner lives. A non-resident owner falls within the Non-Resident Landlord Scheme, under which letting agents withhold basic-rate tax unless HMRC approves gross payment. The government's guidance on paying tax on rent to landlords abroad sets out the scheme, and our article on stopping the 20% Non-Resident Landlord withholding explains the application.
From 6 April 2027, Britain introduces separate property income rates of 22%, 42% and 47%, and the withholding rate rises to 22% with them. Moreover, the furnished holiday lettings regime ended in April 2025. Holiday lets are now ordinary property businesses, with mortgage interest relief restricted to a basic-rate credit.
The US 14-Day Rule
US law treats short lets very differently. If you rent a dwelling that you also use as a residence for fewer than 15 days in the year, section 280A(g) of the Internal Revenue Code excludes the rent from US income entirely. Consequently, twelve nights at Wimbledon or the Chelsea Flower Show can be tax-free in America while remaining fully taxable in Britain.
That mismatch creates UK tax with no US tax to absorb it. The UK tax on the rent therefore becomes a straight cost rather than a creditable one, although any excess credit can carry forward against other passive income.
Mixed Use and the Vacation Home Limits
Once you let the property for 15 days or more, the US rules in IRS Publication 527 on residential rental property apply. A dwelling counts as your residence if your personal use exceeds the greater of 14 days or 10% of the days you let it at a fair rent. In that case, rental deductions cannot exceed rental income, and you allocate costs between personal and rental days.
Depreciation also differs. A British rental property uses the 30-year Alternative Depreciation System rather than the 27.5-year schedule for American property. Meanwhile, HMRC allows no depreciation on residential buildings at all. Therefore, US rental profit and UK rental profit rarely match, and the credit calculation needs care each year.
Financing a Second Home: US Mortgage Interest and the Currency Trap
Most wealthy buyers finance a second home with a sterling mortgage, even when they could pay cash. The US rules on that borrowing are generous in one respect and punishing in another.
Deducting Mortgage Interest on a British Property
Section 163(h) allows a deduction for qualified residence interest on your principal residence and one other residence. A foreign property qualifies, so interest on a British second home can be deductible on Schedule A. IRS Publication 936 on home mortgage interest sets out the rules. However, the deduction applies only to interest on up to $750,000 of acquisition debt across both homes, and the One Big Beautiful Bill Act made that limit permanent.
If you let the property, it remains a qualified residence only when your personal use exceeds the greater of 14 days or 10% of the rental days. Consequently, a heavily let property loses the residence interest deduction and moves its interest into the rental calculation instead.
The Section 988 Currency Gain
A sterling mortgage creates a separate US tax event when you repay it. The IRS measures the loan in dollars on the day you borrow and again on the day you repay. If sterling has weakened, you repay fewer dollars than you borrowed, and section 988 taxes the difference as ordinary income.
Crucially, the rule does not work in reverse. If sterling strengthens, the currency loss on a personal-use second home is a non-deductible personal loss. Therefore, the currency exposure is a one-way bet against you, and many owners discover it only when they refinance or sell.
Reporting the Accounts That Come With a Second Home
The property itself is not reportable on an FBAR or on Form 8938 when you own it directly. However, the British current account you open to pay the council tax, service charge and utilities is a foreign financial account. If your foreign accounts together exceed $10,000 at any point in the year, you must file an FBAR through FinCEN's foreign bank account reporting system. Moreover, the IRS comparison of Form 8938 and FBAR requirements shows when the separate FATCA form also applies.
A missed FBAR on a small household account is one of the most common problems we see among owners of British property. Our FBAR and FATCA reporting service corrects those gaps before the IRS finds them.
Selling a Second Home: UK Capital Gains Tax and the US Gain
The sale is where the two systems diverge most sharply, and where planning at the purchase stage pays for itself.
UK Capital Gains Tax on a Second Home
A gain on a British second home is taxed at 18% or 24%, depending on your income. Non-residents pay the same rates on UK residential property, and everyone must report the sale within 60 days of completion. The government's guidance on how to report and pay capital gains tax on UK property sets out the process. Late reporting brings automatic penalties, even when no tax is due.
Non-residents who owned the property before 6 April 2015 can use that date's market value as their base cost. Otherwise, the full gain since purchase is taxable, less the stamp duty and legal costs you paid.
The Private Residence Relief Nomination
UK residents with two homes can choose which one counts as their main residence for private residence relief. Under section 222(5), you nominate within two years of first holding the combination of homes, and HMRC's manual at CG64485 on the right of nomination confirms you need not choose the property you mainly live in. Furthermore, the final nine months of ownership of any home that has ever been your main residence always qualify.
Consequently, a UK-resident American can nominate the country cottage that is likely to show the larger gain. However, the IRS has no equivalent election. As our article on private residence relief versus US capital gains tax shows, a gain that Britain exempts is fully taxable in America, with no UK tax to credit.
The 90-Day Rule for Homes Abroad
The nomination has a hidden limit for Americans living in Britain. Under section 222B of the Taxation of Chargeable Gains Act 1992, a home in a country where you are not tax resident qualifies only if you spend at least 90 midnights there in the tax year. Therefore, a UK resident cannot simply nominate a Florida house they visit for a month.
No Section 121 Exclusion for a Second Home
In the United States, the section 121 exclusion of $250,000, or $500,000 for joint filers, applies only to your principal residence. IRS Publication 523 on selling your home confirms that a second home does not qualify. Moreover, converting a second home into your main residence does not rescue the earlier years, because periods of non-qualified use after 2008 reduce the exclusion proportionately.
The US gain is also measured in dollars. Your basis uses the exchange rate on the purchase date, and your proceeds use the rate on the sale date. Therefore, a flat that barely moved in sterling can produce a large dollar gain if the pound strengthened, and vice versa.
Crediting the UK Tax
UK capital gains tax on British real estate is a creditable foreign income tax, and the gain is foreign source because the property sits in the UK. You claim the credit on Form 1116, following IRS Publication 514 on the foreign tax credit. However, the 3.8% Net Investment Income Tax generally cannot be offset by the UK tax, so wealthy sellers usually face a residual US charge even after a full credit.
Case Study: A Chelsea Second Home Bought From Manhattan
Catherine is a Manhattan-based managing director at an investment bank. She owns her New York apartment outright and, in June 2026, she buys a £2,000,000 flat in Chelsea as a second home for London business trips and summers. The figures below are illustrative and use simplified exchange rates.
The Purchase
Catherine owns a US home and was not UK present for 183 days, so both surcharges apply. Her SDLT is £153,750 at standard rates plus £140,000 in surcharges, a total of £293,750. At $1.25 to the pound, that is $367,188, which she adds to her US basis. Meanwhile, she borrows £1,000,000 on an interest-only sterling mortgage at 5%.
The Residence Problem
Catherine planned to spend 105 days in London in 2026/27. She had spent 95 days in the UK in 2025/26, giving her the 90-day tie, and she expected to work 45 London days, giving her the work tie. Together with the accommodation tie from the flat, she held three ties. As an arriver with three ties, she would have become UK resident at 91 days.
Instead, we restructured her calendar. She cut her London workdays to 30 and her total UK days to 88. Consequently, she met the full-time work overseas test and stayed automatically non-resident, which kept roughly $1.4 million of American compensation out of the UK tax net.
The Running Costs and the Mortgage
Her Band H council tax of about £3,100 doubled to £6,200 under the local second home premium, and she can deduct none of it in America. However, her mortgage interest of £50,000, about $65,000, is qualified residence interest. Her acquisition debt was $1,250,000, so only the first $750,000, or 60%, qualifies, giving a Schedule A deduction of $39,000.
She also let the flat for 12 nights during Wimbledon for £9,000. Under the 14-day rule, the IRS ignores that income. Britain, by contrast, taxes it, and after the £1,000 property allowance she pays £1,600 of UK tax that has no US tax to offset.
The Sale in 2031
Catherine sells in 2031 for £2,400,000 when the pound stands at $1.30. For UK purposes, her gain is £400,000 less £293,750 of stamp duty, or £106,250. After the £3,000 annual exempt amount, she pays 24% UK capital gains tax of £24,780, reported within 60 days.
For US purposes, her proceeds are $3,120,000 and her basis is $2,867,188, giving a gain of $252,812. Her US tax at 20% is $50,562, against which she credits the UK tax of $32,214. She therefore pays $18,348 of regular US tax plus $9,607 of Net Investment Income Tax, a total of $27,955.
Finally, she repays the £1,000,000 mortgage at $1.30, costing $1,300,000 against the $1,250,000 she borrowed. That $50,000 currency loss is personal and non-deductible. Had sterling fallen to $1.20 instead, she would have owed ordinary income tax on a $50,000 currency gain. In our experience, this asymmetry is the single most overlooked cost of a British second home.
How TaxYork Can Help
TaxYork prepares US and UK returns for Americans who own property on both sides of the Atlantic. We model the stamp duty position before exchange, map your UK days and ties across the tax year, and build the dollar basis the IRS will expect when you sell. Furthermore, we prepare the Form 1116 credit on UK capital gains tax, the 60-day UK property return and the section 988 calculation on your sterling mortgage.
Our US tax returns for expats service handles the annual filings, including Schedule A mortgage interest and Schedule E letting income. Where accounts or returns have slipped, we also handle missed US tax returns, missed FBARs and missed UK tax returns as a single coordinated project, so both countries receive consistent figures.
Conclusion
A second home in Britain is a rewarding purchase, but it carries a heavier and more complex tax load than most buyers expect. The purchase attracts up to 19% stamp duty with no US credit. The accommodation tie can turn a few extra weeks into full UK residence. Moreover, council tax premiums double the running costs, short lets create UK-only tax and a sterling mortgage leaves you exposed to a one-way currency charge.
The sale then brings UK capital gains tax, a US gain measured in dollars with no section 121 exclusion, and Net Investment Income Tax that no credit removes. However, every one of these costs can be reduced with planning before you exchange contracts. Therefore, the right time to take specialist advice on a British second home is before you make the offer, not after the first tax return arrives.
Contact Us
If you are buying, own or plan to sell a property in Britain, our US-UK specialists can model the full cross-border cost before you commit. Please book a consultation with the TaxYork team, email hello@taxyork.com or call 020 3488 8606.
Disclaimer
This article provides general information about the US and UK tax position of an American who owns a second home in Britain as at October 2026 and does not constitute tax, legal or financial advice. Tax rules, rates and exchange rates change frequently, and the correct treatment depends on your personal circumstances. The case study is illustrative, uses assumed figures and simplified calculations, and does not describe a real client. Please obtain professional advice tailored to your situation before acting on any information in this article.