A contract Britain ignores and America reports in full

Figures relate to tax year 2025-26 (UK) · 2025 (US)

British platforms advertise it plainly. No capital gains tax, no stamp duty, nothing to report.

All of that is correct, and all of it stops at the border. Spread betting has no American exemption of any kind.

So an American in Britain is running a position that is invisible to one tax authority and fully taxable to the other, with no statement pointing it out.

Key takeaways

• Spread betting is free of UK capital gains tax and stamp duty.
• America has no equivalent exemption at all.
• Spread betting gains are taxable in America and must be reported.
• Losses are not relievable in Britain, which cuts both ways.
• The currency element can be taxed separately.
• A British broker will not issue American tax documents.
• The investment income surcharge can apply on top.
• CFDs raise the same spread betting questions with a different label.

What is a spread bet?

A contract where you take a position on a price without owning anything. You never hold the share, the currency or the commodity; you hold a contract whose value moves with it. Per GOV.UK guidance on what capital gains tax applies to, betting winnings fall outside the charge, and British law treats these contracts that way.

You own a contract, not an asset, which is exactly why Britain treats it differently.

That label is what produces the exemption people value so highly.

How is it different from a CFD?

They are close cousins, and the tax treatment diverges in Britain. A contract for difference is subject to capital gains tax here, while a spread bet is not, though neither involves owning the underlying. Losses on a CFD can therefore be claimed in Britain while losses on a spread bet cannot.

The economics are nearly the same. The British tax answer is not.

For American purposes that distinction largely disappears again.

Why does the exemption not travel?

Because America taxes income by what it is, not by a British label. No American rule frees a trading contract from tax just because Britain calls it a bet. So the profit is income or gain depending on the instrument, and it goes on your return either way.

No treaty article rescues this. The treaty splits taxing rights; it does not create exemptions.

A British carve-out has no effect on an American citizen at all.

How does America characterise the contract?

It depends on what the contract is, and that answer drives the rate. Some positions fall under the currency rules and give ordinary income, while others count as capital. Assuming every result is a capital gain is the commonest error we see here.

Our guide to currency gains on UK bank accounts covers the currency rules.

The instrument decides the character, and the character decides the rate.

A worked example

Take an illustrative example. An American in London makes £22,000 across a year of index positions on a British platform.

Her annual statement shows the profit and notes that no UK tax is due, which is accurate.

She files nothing in Britain, correctly, and reports nothing in America, incorrectly.

The American charge on £22,000 of unreported profit, plus the investment surcharge and interest once it surfaces, is a much larger problem than the tax would have been.

One position, two answers

Can you claim the losses?

In Britain, no, because an exempt activity produces no allowable loss. In America the position is better, since a taxable gain implies a deductible loss, subject to the usual limits on how much you can set against other income. That asymmetry occasionally works in your favour.

Our guide to UK capital losses for US citizens covers the British side.

Losing money is one of the few situations where the American treatment helps.

Is there any British tax at all?

Not on the profit from the bet itself, which is the whole point of the product. Trading on a scale that amounts to a trade could be taxed another way. That is rare, and HMRC sets the bar high. For nearly everyone the British answer is simply nothing.

So you genuinely have no British filing to make on these positions.

That silence is precisely what makes people forget the American side.

What does the broker report?

A running statement of your account, and nothing else. A British platform has no reason to issue American tax documents and will not do so. So the figures for your American return have to be assembled from the platform statements by you or your preparer.

Download the annual statement each year rather than relying on the platform to keep it.

Brokers routinely purge historic data after a surprisingly short period.

Does the currency matter?

It does, and it is measured separately from the trading result. Your account is held in pounds while America works in dollars, so movement in the exchange rate produces its own gain or loss. A profitable year in sterling can look different once converted.

Our guide to exchange rates on a US return covers the conversion.

Each closed position needs the rate on its own closing date.

What about the investment income surcharge?

It can apply, and no foreign tax credit will touch it. The net investment income tax is charged on investment income above a threshold and sits outside the treaty credit system entirely. Since there is no British tax to credit anyway, this charge arrives undiluted.

Our guide to the net investment income tax covers the charge.

With no credit available, the full American bill lands on you.

Does the foreign tax credit help?

There is nothing to credit, which is the uncomfortable heart of the problem. The credit relieves double taxation by offsetting foreign tax paid, and here Britain charges none. So the American tax is not reduced at all, unlike almost every other category of British income.

Our guide to Form 1116 income baskets covers how credits work.

A British exemption always produces an undiluted American charge.

Does the account need reporting?

Very probably, on the usual thresholds. A spread betting account held with a British provider is a foreign financial account, and its balance counts towards the reporting limits alongside your bank accounts. Margin balances move fast, so the peak can sit far above the closing figure.

Our guide to the FBAR covers the thresholds and the aggregation.

The test uses the highest balance during the year, not the figure on 31 December.

What about an ISA or a pension wrapper?

Neither is available for this, so the question does not really arise. These products sit outside tax wrappers by design. So the usual escape route is shut. You cannot shelter it somewhere the treaty respects.

Our guide to ISA alternatives for Americans covers the wrappers.

There is no sheltered version of this product to move into.

How is this different from gambling winnings?

Britain groups them together and America does not. Under American rules a casino win and a trading contract are separate things. The reporting differs, and so does the treatment of losses. So arguing from one to the other gives the wrong answer both ways.

Our guide to UK gambling winnings on a US return covers the other category.

The British label is what misleads people into connecting them.

Does frequent trading change anything?

It can, on both sides, though the thresholds differ. Very heavy activity might count as a trade in Britain. America has its own rules for people who trade as a business. Neither reaches somebody placing the odd position around a job.

Volume alone rarely passes either test on its own.

Take advice before assuming you qualify for anything as a trader.

What if you have never reported it?

You are in very common company, because nothing in the British experience prompts you to. You can amend recent years, or use the streamlined route where the history is longer. Acting before the account shows up in the data swap beats acting after.

Our guide to amending a US return covers the correction.

In our practice this surfaces when somebody changes adviser rather than through an enquiry.

Will the IRS find out?

Possibly, through the account rather than the trading. The two countries swap data on financial accounts. So a platform account and its balance can be reported, even though Britain does not tax the profit. An account with no matching return invites questions.

Our guide to the FATCA letter from a UK bank covers the exchange.

The account is visible even where the income is not.

Is there a better alternative?

Usually yes, if the draw was the tax break rather than the leverage. An American gets no benefit from the British exemption, so the main argument for the product disappears. Normal holdings get taxed in both countries, and that at least buys you a credit.

Our guide to UK gilts and US tax covers a related mismatch.

Choose the product for the strategy, never for a tax break you cannot use.

What records should you keep?

Annual statements, a list of closed positions with dates, and the exchange rates applied. Those three let anyone rebuild the American calculation years later. Platform data is the part that disappears fastest once an account is closed.

Export the full trade history at the end of every calendar year without exception.

Reconstructing hundreds of closed positions from memory is simply not possible.

Does spread betting suit an American at all?

Rarely, once the tax break is off the table. The whole appeal of spread betting rests on a British exemption that does nothing for you, so you carry the leverage and the risk while paying full American tax on any win. A plain holding in the same market usually leaves you better off after tax.

So the case for it collapses the moment you hold an American passport.

What remains is a geared bet with no tax advantage to show for it.

What if your spouse is British?

Then the account belongs in their name, if either of you wants spread betting at all. A British spouse gets the exemption in full and has no American return at all, so the mismatch simply vanishes. Whose name sits on the account decides the entire tax outcome here.

Our guide to joint accounts for US UK couples covers ownership.

But the account has to be genuinely theirs, not yours with their name on it.

Does spread betting affect your UK return?

Not at all, and that is the root of the problem. You file nothing in Britain for spread betting, receive no tax document, and see no prompt from any adviser here. Everything about the British experience tells you the matter is closed, which is exactly why the American side gets forgotten.

So silence in one system is not evidence of safety in the other.

It is the quiet holdings that cause the trouble, not the noisy ones.

How far back should you look?

At least six years, because that is where the practical risk sits. Unreported income can keep a year open well beyond the usual window, and a platform account that was never disclosed adds a second thread. Pulling the full history at once is less painful than doing it a year at a time.

Our guide to the statute of limitations covers which years stay open.

Most platforms will still export several years if you ask them promptly.

What does the spread betting platform tell you?

That no UK tax is due, which is true and complete from a British point of view. No British platform has any duty to mention foreign tax, and none of them do. So the only document you receive is accurate, reassuring and silent about the half of your position that actually carries a bill.

So read the statement as a British document, because that is all it was ever meant to be.

Nothing in it is wrong, and nothing in it helps you with the American return.

Should you tell your UK adviser you are American?

Always, and early. A British adviser looking at spread betting will correctly see nothing to report and move on, because from where they sit there genuinely is nothing. They cannot flag an American consequence they have no reason to consider, so the information has to come from you.

So say it at the first meeting rather than waiting for tax to come up.

It changes which products they put in front of you in the first place.

Does closing the account fix the past?

No, and it can make the history harder to rebuild. The liability attaches to the years you traded rather than to whether the account is still open, so closing it changes nothing about what you owe. What it does change is your access to the statements you will need.

So export the full spread betting history before you close anything.

Platforms rarely help former customers reconstruct years of closed positions.

How to report spread betting in America

1. Download the full annual spread betting statement from the platform.
2. List every closed position with its opening and closing dates.
3. Work out whether each contract is a currency position or a capital one.
4. Convert each result to dollars at the rate on its closing date.
5. Report gains in the right character rather than assuming capital treatment.
6. Claim losses within the limits that apply to each category.
7. Consider the investment income surcharge separately.
8. Include the account in your foreign account reporting at its peak balance.

Mistakes and penalties we see with spread betting

The first is reading a British statement saying no tax is due and concluding nothing needs reporting anywhere.

The second is treating every result as a capital gain when some contracts produce ordinary income.

The third is leaving the platform account off the foreign account reporting entirely.

The fourth is choosing the product specifically for a British tax break that an American simply cannot use.

How US UK Tax Accountants helps

We start by labelling the contracts, because whether a position produces ordinary income or a capital gain changes the rate substantially and nothing on the statement tells you which.

Then we rebuild the year in dollars and bring the account into the reporting. Our US federal returns service covers the filing.

If you hold a platform account and have never reported it, get in touch before the account surfaces on its own.

Last reviewed 23 October 2026. This article is general information and not personal tax advice, and the treatment depends on the particular contracts you hold.