Introduction: The Gambling Winnings Tax Britain Never Charges but America Does
The gambling winnings tax position for an American living in London is one of the starkest mismatches in cross-border finance. In Britain, a punter who collects £250,000 from a bookmaker, a casino table or a lottery draw keeps every penny, and nothing appears on a Self Assessment return. However, a United States citizen or green card holder sitting at the same table owes the IRS ordinary income tax on the whole amount, at rates reaching 37%, because US gambling winnings tax follows the passport rather than the postcode.
Furthermore, the rules tightened sharply on 1 January 2026. The One Big Beautiful Bill Act now allows only 90% of gambling losses to be deducted, so a year in which you break even in cash can still leave a taxable profit on your US return. Consequently, high-stakes poker players, serious racing and sports bettors, private members' club regulars and anyone who has landed a large prize draw needs to understand the gambling winnings tax rules before the year closes, not after. At TaxYork, we prepare US and UK returns for exactly this kind of high-net-worth dual filer, and this guide sets out what you owe, what you can deduct, and how existing UK tax credits can sometimes eliminate the bill altogether.
Why Gambling Winnings Tax Rules Split Along Citizenship Lines
The United States taxes its citizens on worldwide income wherever they live. Therefore the fact that you placed a bet in Newmarket, played cash games in Mayfair or bought a EuroMillions ticket in Leeds changes nothing about whether the win is reportable. By contrast, Britain taxes residents, but it simply does not treat betting as a source of income at all.
The result is a one-sided gambling winnings tax charge. There is no UK tax to credit, no treaty article that shields a US citizen, and no exclusion that applies to unearned income. Accordingly, the gambling winnings tax falls entirely on the American side of your affairs.
How Britain Treats Gambling: No Income Tax, No Capital Gains Tax
British law has declined to impose any gambling winnings tax on punters for a century. Courts have long held that betting is not a trade, even for a skilled and systematic gambler, and HMRC's own Business Income Manual guidance on betting and gambling still reflects that position. Additionally, section 51 of the Taxation of Chargeable Gains Act 1992 states that winnings from betting, pool betting, lotteries and games with prizes are not chargeable gains.
Instead, Britain taxes the operator. Bookmakers, casinos and online platforms pay gambling duties on their profits, and those duties are rising steeply. Remote Gaming Duty increased from 21% to 40% in April 2026, and a separate 25% rate for remote betting is due in April 2027. However, none of that duty is imposed on you personally, so it cannot be claimed as a foreign tax credit on your US return.
Where British Tax Does Still Apply
There are narrow exceptions worth knowing. Appearance fees, sponsorship income and media payments earned by a well-known poker player are payments for services, so HMRC taxes them as trading or miscellaneous income. Similarly, once your winnings sit in a savings account, the interest they generate is taxable in Britain in the ordinary way. Nevertheless, the core stake-and-return profit remains outside the UK tax net, which is precisely why the gambling winnings tax gap is so wide for US persons.
The US Gambling Winnings Tax Rules Every American Abroad Must Follow
The IRS view on gambling winnings tax is uncompromising. According to IRS Topic 419 on gambling income and losses, gambling winnings are fully taxable and must be reported whether or not a payer issues a form. That includes casino and card-room wins, sports and racing bets, lottery prizes, raffles, and the fair market value of non-cash prizes such as cars, holidays and even houses won in prize draws.
Winnings go on Schedule 1 of Form 1040 as other income, and they are taxed at your ordinary marginal rate. For 2026, Revenue Procedure 2025-32 sets the 37% bracket at taxable income above $640,600 for single filers and $768,700 for joint filers. Therefore a London banker, fund manager or business owner will usually pay gambling winnings tax at the top rate on every extra pound won.
Why British Bookmakers Never Send You a Form
American casinos issue Form W-2G when winnings cross reporting thresholds, and from 2026 the slot and bingo threshold rose from $1,200 to $2,000. However, UK operators have no US reporting duty at all. Consequently, nothing arrives in the post, nothing reaches the IRS directly, and the obligation to reconstruct your wins sits entirely with you. That silence is the reason so many Americans in Britain have years of unreported gambling winnings tax exposure without realising it.
Converting Sterling Wins Into Dollars
Every sterling amount must be translated into US dollars. A single large win, such as a jackpot or a major tournament cash, is best converted at the exchange rate on the day you received it. By contrast, a steady flow of small bets across the year is commonly converted at the yearly average rate, provided you apply the method consistently. Either way, the conversion should be documented alongside your gambling records, because an examiner reviewing your gambling winnings tax calculation will ask for it.
The 2026 Change: Only 90% of Gambling Losses Are Deductible
Before 2026, a recreational gambler could deduct losses up to the amount of winnings, so a break-even year produced no tax. The One Big Beautiful Bill Act amended section 165(d) of the Internal Revenue Code for tax years beginning after 31 December 2025. Now only 90% of wagering losses can be deducted, and the deduction remains capped at the winnings you report.
The effect is phantom income, and it changes the gambling winnings tax calculation for every serious player. If you win $500,000 and lose $500,000 across 2026, you may deduct only $450,000, so $50,000 is taxable although your bank balance never moved. Moreover, losses still cannot offset salary, bonus or investment income, and unused losses do not carry forward to future years.
Itemising Is Still Required, and the 2/37 Limitation Bites
Losses are an itemised deduction on Schedule A. Consequently, if your total itemised deductions fall below the 2026 standard deduction of $16,100 for a single filer or $32,200 for a married couple filing jointly, the losses give you nothing. Many Americans in Britain have few other itemised deductions, because UK council tax is not deductible for US purposes, so this threshold matters more than it would in the United States.
Furthermore, top-rate taxpayers face a second haircut. From 2026 a new limitation reduces itemised deductions by 2/37ths of the lower of your total itemised deductions or the amount by which your income exceeds the start of the 37% bracket. In practice, a high earner deducting large gambling losses loses roughly 5.4% of the value of that deduction on top of the 90% cap. Therefore the effective gambling winnings tax on a volatile year can be materially higher than the net cash result suggests.
Sessions, Diaries and Proof
The IRS measures wins and losses by gambling session rather than by individual bet, and it expects a contemporaneous record. A diary showing the date, venue or platform, game or event, stake, and result for each session, backed by account statements and bank transfers, is the standard. Without it, an examiner can disallow losses entirely while still charging gambling winnings tax on the full winnings. Online sportsbooks and casino platforms usually provide downloadable account histories, so preserving them each year is the single most useful habit a serious gambler can adopt.
Why the Foreign Earned Income Exclusion and Treaty Relief Do Not Help
Many Americans in Britain rely on the Foreign Earned Income Exclusion to shelter salary. However, the exclusion covers only earned income from personal services. Gambling winnings are unearned, so Form 2555 cannot reduce your gambling winnings tax, however long you have lived abroad.
Similarly, the US-UK treaty offers a false hope. IRS Publication 515 confirms that qualifying UK residents are exempt from US tax on US gambling winnings, which is why a British tourist can reclaim withholding on a Las Vegas jackpot. Nevertheless, the US-UK income tax treaty contains a savings clause allowing America to tax its own citizens as if the treaty did not exist. Consequently, a dual national US UK citizen cannot use a British passport to escape US gambling winnings tax, a point we explore further in our guide to which treaty articles survive the savings clause.
The One Relief That Does Exist: Net Investment Income Tax
There is one welcome exclusion. The 3.8% net investment income tax applies to interest, dividends, rents, royalties, capital gains and passive business income, and the IRS questions and answers on the net investment income tax do not bring recreational gambling winnings within those categories. Therefore a casual gambler's winnings bear ordinary rates but not the additional 3.8% surcharge that falls on a UK share portfolio.
The Foreign Tax Credit Angle Most Advisers Miss
Here is where careful return preparation changes the gambling winnings tax outcome. Although there is no UK tax on your winnings, winnings from British bookmakers, casinos and lotteries are generally foreign-source income for US purposes. Moreover, they fall into the general limitation category on Form 1116, the same category as your UK salary and bonus.
That matters because most high earners in London pay UK income tax at 45% plus National Insurance, which exceeds their US liability on the same pay. As a result, they build up excess general category foreign tax credits that carry forward for ten years. Adding foreign-source gambling income raises the foreign tax credit limitation, which allows those stored credits to absorb the US tax on the winnings. In other words, UK tax you have already paid on your salary can shelter US gambling winnings tax on a British win, provided the carryovers were properly tracked on earlier returns.
However, the planning has limits. Wins on US-based platforms or in American casinos are US-source income and cannot use foreign credits. Similarly, anyone who used the Foreign Earned Income Exclusion rather than credits in earlier years may have no carryover to draw on. Our guide to foreign tax credit carryovers for Americans in Britain explains how to rebuild the schedule if prior years were prepared carelessly, and our tax treaty optimisation service models the position before you file.
FBAR, FATCA and Reporting the Money Once You Win It
Winnings create reporting duties that go beyond the gambling winnings tax itself. When a large win lands in a British bank account, the account's maximum value during the year rises, and an aggregate balance above $10,000 across all foreign accounts triggers the FinCEN Report of Foreign Bank and Financial Accounts. Additionally, Americans living abroad must file Form 8938 once specified foreign financial assets exceed $200,000 at year end or $300,000 at any time for a single filer, doubled for joint filers, as the IRS comparison of Form 8938 and FBAR requirements explains.
What about the betting account itself? In a well-known case involving a US citizen's online poker balances, the Ninth Circuit held in an unpublished opinion that the poker site accounts were not foreign financial accounts, but that an e-wallet used to move money to and from them was. The Journal of Accountancy analysis of that decision is a useful summary. Because the ruling carries no precedential weight, the prudent approach is to report any foreign e-money or payment wallet that holds gambling funds, and to discuss sportsbook balances with a preparer. Our FBAR and FATCA reporting service handles these borderline accounts routinely.
Estimated Tax After a Big Win
A large win in, say, March does not wait for the April filing deadline. The IRS expects quarterly estimated tax payments on income without withholding, and a UK win has none. High earners with prior-year adjusted gross income above $150,000 generally need to pay 110% of the prior year's liability to reach safe harbour. Our guide to estimated taxes for Americans abroad sets out the timing, and it is often the difference between a clean return and an avoidable penalty.
Missed US Tax Returns and Unreported Winnings From Earlier Years
Because no British operator reports to the IRS, unreported wins are common, and they tend to surface when a large deposit, a property purchase or a bank's FATCA review prompts questions. The normal assessment period is three years. However, section 6501 of the Internal Revenue Code extends it to six years where omitted income exceeds 25% of the gross income reported, which a single substantial win can easily do.
Correcting the position is usually straightforward if you act first. For filers who reported their salary but left out winnings, amended returns are the usual route, and our explanation of Form 1040-X for expat returns walks through the mechanics. Where years were never filed at all, or where related foreign accounts were missed as well, a structured offshore disclosure through our IRS Streamlined Filing service may be appropriate. In either case, reconstructing the win-loss history with platform statements and applying any available foreign tax credit carryovers can reduce the gambling winnings tax on catch-up years significantly.
Case Study: A London Fund Manager's 2026 Gambling Winnings Tax Bill
Consider an illustrative client we will call James, a US citizen and portfolio manager living in Kensington. His 2026 UK salary and bonus total £900,000, and he has paid UK tax at 45% on that pay for six years, claiming foreign tax credits rather than the exclusion. As a result, he carries forward $210,000 of unused general category credits.
James is also a serious poker player and racing bettor. Across 2026 his session records show winnings of £480,000 and losses of £390,000 on British platforms and at a London card room, a net cash profit of £90,000. For simplicity, we convert at $1.34 to the pound, giving winnings of $643,200 and losses of $522,600.
Under the old rules, he would have deducted the full $522,600 and reported taxable gambling income of $120,600. Under the 2026 rules, however, only 90% of losses qualify, so his deduction starts at $470,340. Next, because his income sits far above the 37% bracket threshold, the 2/37 limitation reduces his itemised deductions by a further $25,423, leaving $444,917. Consequently, his taxable gambling income rises to $198,283, even though his real profit was only $120,600.
At 37%, that produces US gambling winnings tax of about $73,365, with no UK tax to credit against it. A preparer who stopped there would send James a bill. However, because the winnings were foreign-source general category income, they increase his Form 1116 limitation by roughly the same $73,365, and his $210,000 carryover absorbs it. James therefore pays no additional US tax on his 2026 winnings, and $136,635 of carryover remains for future years.
The gambling winnings tax lesson is twofold. First, the 90% rule and the 2/37 limitation turned a $120,600 profit into $198,283 of taxable income, so the headline exposure was 64% higher than his cash result. Second, the carryover schedule, built from years of correctly prepared returns, was worth more than $73,000 in a single year. Had James placed the same bets on a US-based platform, the income would have been US-source, and the credits could not have helped.
How TaxYork Can Help
We provide comprehensive US and UK tax return preparation for Americans, green card holders and dual nationals in Britain, including clients whose affairs involve significant gambling, prize or tournament income. Accordingly, our work begins with a session-by-session reconstruction from platform and bank records, followed by accurate sterling conversion and a full Schedule A calculation under the 2026 loss rules.
Preparing the Credit Position Properly
Next, we source every win correctly and place it in the right Form 1116 category, so that genuine UK tax credits on your employment income are used rather than wasted. Where earlier returns lost track of carryovers, we rebuild the history so the credits are available when you need them.
Reporting and Catching Up
Finally, we prepare the FBAR and Form 8938 filings that follow a large win, calculate estimated tax payments, and correct earlier years where winnings were never reported. For clients who also play spread bets, our separate guide to spread betting and US tax covers that closely related gap.
Conclusion
Britain's decision not to tax punters is generous, but it does nothing for a US citizen. The gambling winnings tax falls in full on your American return, the 2026 rules now tax part of every break-even year, and neither the earned income exclusion nor the treaty offers protection. Nevertheless, the picture is not hopeless. Accurate records, correct sourcing and a well-maintained foreign tax credit carryover can reduce or even eliminate the US charge on British wins. Therefore the time to organise your position is before the tax year ends, rather than after a bank or the IRS starts asking questions.
Contact Us
If you have significant winnings, prizes or unreported years to address, book a consultation with our US-UK tax specialists. You can also contact us directly at hello@taxyork.com or on 020 3488 8606, and we will review your records and prepare the returns that follow.
Disclaimer
This article provides general information about gambling winnings tax for US citizens and green card holders living in the United Kingdom and does not constitute tax advice. The case study is illustrative, uses simplified exchange rates and rounded figures, and ignores other items that could affect the result. Tax outcomes depend on individual circumstances, the source of each win and the records available. Accordingly, you should obtain professional advice before acting. TaxYork accepts no liability for action taken in reliance on this article.