You moved your own money and America calls part of it profit

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

You earned in pounds and saved in pounds. One day you moved a large chunk of it back into dollars. No investment was bought and nothing was sold. The same money simply changed its name on the way across.

America sees it differently, and the difference is not a technicality. It treats foreign money as property rather than as cash. So the conversion counts as a disposal. Where the pound strengthened while you held it, part of what came back is a currency gain.

That gain is taxable. Britain charges nothing on the same transaction. No bank reports it and no form arrives to prompt you, which is why it is one of the most commonly missed items on an expat return.

Key takeaways

• America treats foreign currency as property rather than as money.
• Converting sterling into dollars is a disposal of that property.
• Any profit is ordinary income, not a capital gain, whatever the holding period.
• A loss on the same transaction is usually not deductible at all.
• Personal transactions have a $200 exemption, unchanged since 1997.
• Britain took currency bank accounts out of capital gains tax in 2012.
• No British tax paid means no foreign tax credit to offset the charge.
• The rate when you earned the pounds sets your cost, not today rate.

What is a currency gain?

A currency gain is the profit America calculates when you dispose of foreign money that has risen against the dollar. According to IRS guidance, currency other than the dollar counts as property in your hands. Moving it is therefore a disposal, measured against an original cost rather than treated as a neutral transfer.

The logic runs from one starting point. Your functional currency as an individual is the dollar. Every other currency is something you bought with dollars and will one day sell for dollars. Sterling is no different in principle from a holding of shares.

That framing feels wrong to most people. The pounds never felt like an investment. They were wages, and they sat in a current account paying for the weekly shop. The rules draw no line between money you treated as savings and money you treated as money.

When does a currency gain actually arise?

On a disposal, which covers more ground than most people assume. Converting pounds to dollars is the obvious case. Using sterling to buy an asset is another. So is repaying a sterling debt, because the foreign money leaves your hands at a measurable rate.

Holding the pounds triggers no currency gain at all. The pound can double while the money sits in your account and no charge arises. Nothing has been disposed of yet. The gain stays latent until you act on it, and that is the basis of almost all the planning in this area.

Moving pounds between two sterling accounts is also nothing. You still hold the same currency afterwards. It is the change of currency that matters, not the change of bank, the country of the account or the size of the transfer.

What is your cost in the pounds?

The dollar value at the moment you acquired them. For salary that means the rate on each payday. Four years of monthly pay creates a pool of pounds bought at roughly forty-eight different rates. That pool holds almost all the practical difficulty in working out a currency gain.

Very few people have that record. Nobody notes the spot rate on payday, and bank statements show sterling amounts with no dollar equivalent attached. Rebuilding it later means pulling published rates for each month you were paid. That is tedious but perfectly doable from payslips.

Most people use the published yearly average rate for each year the money came in. That works for income received evenly across a year, which salary is. It gives a defensible figure without dozens of separate lookups. A one-off receipt, such as a bonus, should use the rate on its own date.

Whichever method you pick, apply it consistently and keep the source. Switching between an average rate one year and a spot rate the next invites a question. The reason for switching matters, and getting a better answer is not one.

A worked example

The figures below are illustrative. They use round numbers so you can follow each step and substitute your own.

James is American and has worked in London since 2021. By 2025 he holds £80,000 in a British account. He earned it fairly evenly across those four years, at an average rate of about 1.20. His cost in that sterling is therefore roughly $96,000.

In 2025 he moves the whole balance home for a deposit. The rate on the day is 1.35, so he receives about $108,000. Britain taxes none of it. Nothing appears on his British return, because he has moved his own savings between his own accounts.

America sees proceeds of $108,000 against a cost of $96,000. The currency gain is about $12,000 on money he already owned. It is ordinary income, so it stacks on top of his salary at his marginal rate. At 32 per cent that is roughly $3,840 of tax on a transaction that produced no new money.

Splitting the transfer across two tax years would have lowered that figure. So would waiting for a weaker pound. Had the pound fallen instead, he would have had a $12,000 loss and no deduction for it. Neither half of that asymmetry can be fixed after the transfer.

The two treatments compared

The table below is the whole problem in one view. Only one column ever has anything in it, and that is why the charge goes unrelieved.

Why is it ordinary income rather than a capital gain?

Because the rules put foreign currency transactions outside the capital gains regime on purpose. You pay your marginal rate on the profit however long you held the money. None of the preferential treatment a share sale attracts after twelve months applies here at all.

This is the most expensive feature of the regime. It is also the one people find hardest to accept. Someone who held sterling for ten years and someone who held it for ten days pay the same rate on the same movement. The holding period simply does not count.

Ordinary treatment also means the currency gain stacks on your employment income. It does not sit in a lower band of its own. Convert in a year you also took a bonus and the whole gain can land at your top rate, which is a reason to look at the year as well as the rate.

A gain of this kind can also fall within the extra charge on net investment income, depending on your income level. That adds 3.8 per cent above the relevant threshold. No foreign tax credit reduces it, so it lands in full.

Can you deduct a loss if the pound falls?

Usually not, and this is where the rules stop being even-handed. America treats a loss on a personal transaction as a personal expense and allows no deduction. So the regime taxes your gains and ignores your losses on exactly the same kind of movement.

What matters is the purpose of the transaction. Converting savings while managing an investment position can produce a deductible loss, because that is not a personal transaction. Converting because you are moving house, paying a bill or going home generally cannot, whatever the sum involved.

In our practice this asymmetry is what clients find hardest to believe. It is worth stating plainly before anyone plans around a hoped-for loss. You cannot bank a currency loss on one house deposit and set it against a gain on the next. The loss simply disappears.

What is the $200 exemption really worth?

Very little on any transaction that matters. America disregards a currency gain of $200 or less on a personal transaction. The threshold applies per transaction rather than per year, and nobody has increased it since it arrived in 1997.

What it genuinely covers is spending. Paying for a holiday in sterling sits comfortably inside it. So does a restaurant bill abroad or a shop purchase in another currency. That is the point of the rule: ordinary travellers should not have to track exchange rates on a dinner.

What it does not cover is any deliberate movement of savings. A transfer worth making at all will clear $200 on any meaningful rate shift. Timing a conversion to catch a better rate also points away from personal use. Treat the exemption as covering your spending and nothing more.

Why does Britain charge nothing?

Because foreign currency bank accounts held by individuals came out of capital gains tax on 6 April 2012. Before that, a withdrawal from such an account could itself be a chargeable disposal. The reform removed that record keeping burden.

So moving your own money between currencies produces nothing to report here. No British tax arises on the transaction at any level. For a British-only taxpayer the question does not exist, which is why local advisers rarely raise it and American expats so often hear nothing about it.

The exemption covers simple bank accounts, not every asset held in another currency. Sell foreign shares or a foreign property and Britain computes the gain in sterling, using the rates at acquisition and disposal. Currency movement sits inside that British calculation whether you notice it or not.

Why a house purchase is where this bites

Because it converts years of savings in a single transaction. The deposit is the largest conversion most expats ever make. The completion date fixes the rate for you. By the time anyone thinks about tax, the money has already moved.

The scale comes from simple arithmetic. Acquire sterling around 1.20 and convert around 1.40, and roughly a sixth of the amount becomes a currency gain. On a $300,000 transfer that is $50,000 of ordinary income, arriving in a year when every spare dollar is already committed.

Using sterling to buy a British property works the same way. Spending the currency is a disposal just as converting it is. The purchase and the currency position are two separate questions that happen to share a date. Both need working out in the same year.

Does a sterling mortgage create a currency gain too?

It creates a closely related charge on the debt rather than on your savings. Repaying or refinancing a sterling mortgage can produce a gain where the pound has weakened since you borrowed. You are settling a liability that now costs fewer dollars than when it arose.

The direction catches people out, because it runs opposite to the one on cash. A falling pound hurts you on savings and helps you on the mortgage. A single remortgage can therefore produce a gain on the debt and a loss on the deposit at once. The gain is taxable and the loss probably is not.

Our guide to the mortgage currency gain sets out the mechanics, including what counts as a refinancing. The point here is simply that the debt side exists, and you measure it separately from everything above.

Is any relief or credit available?

No, and that is what makes this item unusual. The foreign tax credit relieves American tax by reference to foreign tax you actually paid. Britain charges nothing on the conversion. So no British tax exists to claim against the American charge.

Almost every other cross-border problem is a timing or basket question. Both countries tax the income, the credit sorts most of it out, and the argument is about which year or which category. Here there is no second tax at all, so the credit machinery has nothing to work with.

Our guide to Form 1116 income baskets explains the credit where foreign tax does exist. On a plain bank account it does not. That leaves timing as the only lever you genuinely control.

How do you plan around a currency gain?

Mainly by controlling when the conversion happens and how much moves at once. Splitting a transfer across two tax years spreads the gain over two sets of brackets. Converting when the pound sits closer to your acquisition cost reduces or removes the gain entirely.

The constraint is that a house purchase fixes the date. Once completion is set, the only decision left is how much of the deposit comes from sterling you already hold. Pounds bought recently carry almost no embedded currency gain, because cost and proceeds sit at nearly the same rate.

That points to a simple habit for anyone planning a move home. Convert gradually while you are still earning the pounds. Do not let four years of savings pile up and crystallise in one transaction. The running total of embedded gain only grows while the money sits there.

Is the account reportable as well?

Almost certainly, and that duty is entirely separate from any tax on the conversion. A British account counts towards the annual foreign account reporting thresholds whether or not you converted a penny. The test looks at the highest balance you reached during the year.

People conflate the two questions constantly, so separate them firmly. Reporting an account tells the authorities it exists. Taxing a currency gain charges you on a profit. An account can be reportable with no tax arising, and a conversion can be taxable in a year the balance stayed low.

Our guide to FBAR deadlines and penalties covers the thresholds and the filing. Where savings have built up towards a deposit, the balance usually clears them comfortably in the year before the money moves.

How to work it out

1. List every conversion out of sterling during the calendar year.
2. Record the sterling amount and the dollars actually received on each.
3. Establish when the pounds being converted were originally acquired.
4. Apply the published yearly average rate for each year they came in.
5. Compare the dollars received against that reconstructed cost.
6. Check whether the personal transaction exemption covers any small result.
7. Report the remaining gain as ordinary income on your return.
8. Keep the rate source and a note of your method with that year papers.

What records make this manageable?

Payslips showing when you earned the sterling, statements showing each conversion, and a note of the rate source you used. Those three turn a speculative reconstruction into a routine annual job that takes under an hour.

The most useful habit is recording the rate as you convert, while the transfer confirmation still shows it. Finding a historic rate for a single day years later is possible but tiresome. The confirmation also shows the rate you actually got, rather than a published mid-market figure.

Keep a running note of your sterling cost pool too, updated once a year. It takes minutes. When a deposit finally arrives, the hard part is already done rather than waiting to be rebuilt from eight years of payslips.

Mistakes and penalties we see with a currency gain

The first is assuming no tax arises because Britain charges nothing. The two systems run independently here. The absence of a British charge is exactly why no credit softens the American one.

The second is treating the profit as a capital gain and applying a long term rate. The rules put currency outside that regime deliberately. On a large deposit transfer, the gap between the two rates is substantial.

The third is claiming a loss the personal transaction rules disallow, usually after converting at a bad moment. The fourth is using today rate as the cost of pounds earned years ago. That quietly erases the whole gain, and it is the error most often caught on review.

How US UK Tax Accountants helps

We rebuild when you acquired your sterling and apply published rates consistently across every year involved. Then we work out whether a reportable currency gain arises, before a large transfer leaves your account. Where a purchase is coming, we model the position across two tax years.

Where a house purchase or a move home has already happened, we look at the year it fell into and what the right figure should have been. Our US federal return service covers the filing and any amendment that follows.

If you are about to move a large sum home, get in touch before you instruct the bank. Timing is the only variable you control, and it stops being a variable the moment the transfer goes through.

Last reviewed 6 October 2026. This article is general information and not personal tax advice. Every transfer turns on its own facts, so take advice on yours before converting.