Is crypto taxed as currency or property?

As property in both countries, which is why disposals create capital gains rather than currency movements. Selling, swapping, spending and gifting all count as disposals. Only moving coins between wallets you personally control escapes, because no economic change of ownership has actually taken place.

Do I pay tax twice on the same crypto gain?

Usually not, because foreign tax credits relieve double taxation. The complication is timing: mismatched tax years can put the two taxes in different periods, so the credit may need carrying. The relief generally works, but the paperwork rewards care and good records.

Why do my UK and US gains differ on the same trade?

Because the cost basis rules differ fundamentally. Britain pools each token into one average cost, while America tracks individual purchase lots and allows specific identification. Two honest calculations from identical transactions can therefore produce genuinely different gains, and both are correct in their own system.

Is staking income or capital gains?

Income at the moment you receive the reward, valued then, in both countries. That value becomes the cost base for those coins, so selling later creates a separate capital gain or loss. One reward therefore produces two taxable moments, often in different tax years.

Do transfers between my own wallets create tax?

No. Moving coins between wallets or exchanges you control is not a disposal in either system, because ownership never changes. The practical risk is data rather than tax: software often misreads internal transfers as sales, which inflates your gains unless you reconcile them properly.

What if I lost access to a wallet?

Both countries have routes for genuinely lost or worthless assets, though each demands evidence and the treatment differs. Document what happened, when, and what you did to recover access. Claims made years later with no contemporaneous record are the ones that fail on review.

Does crypto need reporting on foreign asset forms?

It depends on how and where you hold it, and the position has been tightening as rules evolve. Crypto held through a foreign exchange account raises different questions from coins in a self-custodied wallet. Check the current treatment rather than assuming last year's answer still holds.

What records should I keep?

Full transaction exports from every exchange, downloaded annually rather than when needed. Add wallet addresses, dates of control, values in both currencies at each disposal, and reward records at receipt. Exchanges close and history disappears, so downloading late is how reconstruction becomes expensive.

I never reported crypto in past years — what now?

Fix it deliberately rather than waiting, because exchange reporting to tax authorities keeps expanding. Where US returns were missed entirely, the streamlined procedures usually cover the catch-up. Where returns were filed but crypto was omitted, amendments are typically the route. Take advice on sequencing first.

Crypto Tax for US UK Dual Filers: 2026 Guide

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

Crypto tax catches dual filers twice over. Both HMRC and the IRS treat cryptoassets as property rather than currency. So a disposal is a taxable event in each system, twice. What differs is how each one measures the gain, when it falls due, and what counts as a disposal in the first place.

Those differences matter more than the headline rates. A trade that produces one number for HMRC can produce another for the IRS, from the same wallet on the same day. So this crypto tax guide covers the rules on each side. It also covers the mismatches, and how credits stop you paying twice.

Key takeaways

Both countries tax crypto as property, so selling, swapping and spending are all disposals.
The UK pools your holdings; America tracks individual lots. Same trades, different gains.
Staking and mining rewards are income when received, then an asset with its own cost base.
Moving coins between your own wallets is not a disposal in either country.
Foreign tax credits usually prevent double taxation, but only where the timing lines up.

What counts as a taxable event?

More than selling for cash. Swapping one token for another is a disposal, as is spending crypto on goods or services. Gifting to anyone other than a spouse counts too. Only transfers between wallets you personally control escape, because nothing changes hands economically.

Both authorities agree on this framing. According to the IRS guidance on digital assets (opens in a new tab), dispositions are reportable. Every US return also asks the digital asset question directly. HMRC's position on tax when you sell cryptoassets (opens in a new tab) mirrors it closely.

How does each country calculate the gain?

Here the two crypto tax systems part company. Britain pools each token type into a single average cost, adjusted every time you buy. America tracks individual purchase lots instead. You may choose which coins you sold, provided your records identify them.

The consequence is real. Sell half a holding bought across several years, and the UK uses your blended average. The US may use a specific high-cost lot instead. Two honest calculations, two different gains, from identical transactions.

How the two systems differ on crypto
Issue	UK (HMRC)	US (IRS)
Cost basis	Section 104 pooling — one average per token	Individual lots, with specific identification allowed
Same-day rule	Same-day and 30-day rules apply	No equivalent; wash sale rules have not applied to crypto
Annual exemption	A small capital gains allowance applies	None — every dollar of gain counts
Tax year	6 April to 5 April	1 January to 31 December
Staking rewards	Income at receipt, then a new cost base	Income at receipt, then a new cost base

The same trade, honestly reported on both sides, can produce two different gains. That is a feature of the rules, not a mistake in your maths.

What about staking, mining and airdrops?

Both countries treat rewards as income when you receive them, valued at that moment. That value then becomes the cost base for the coins. So a later disposal produces a separate crypto tax gain or loss on top.

Two taxable moments from one reward surprises people every year. The income arrives whether or not you sold anything, which can create a bill with no cash behind it. Airdrops follow similar logic. The treatment then turns on whether you did anything to earn them.

How do you report crypto tax on both returns?

You prepare each country's crypto tax calculation separately from the same transaction data. Reusing one country's numbers for the other is the single most common error. Work through the sequence below once a year, ideally soon after the UK tax year ends:

Export the full transaction history from every exchange and wallet you used.
Reconcile transfers between your own wallets, so they are not counted as disposals.
Build the UK calculation using pooling, with the same-day and 30-day rules applied.
Build the US calculation separately, by lot, across the calendar year.
Convert everything at appropriate rates — sterling for HMRC, dollars for the IRS.
Report income from staking or mining in the year of receipt on both sides.
Claim foreign tax credits where the same gain is taxed twice, matching the years carefully.

The timing mismatch that catches everyone

The two tax years do not align, and crypto moves fast enough for that to matter. A gain realised in February sits in one UK year and a different US one. So the credit that should relieve it may fall due early. The other country may not have taxed that gain yet.

The credit usually still works, but the paperwork needs care and sometimes carryovers. Our guide to Form 1116 and the foreign tax credit covers baskets and carryovers, and crypto gains generally sit in the passive basket where surplus credits strand easily.

Does the UK allowance help a dual filer?

Only on the British side. The UK gives every taxpayer a modest annual exempt amount for capital gains, and small crypto tax gains can fall entirely inside it. America grants no equivalent, so the same gain remains fully taxable there.

That asymmetry creates a trap. A gain sheltered by the UK allowance produces no British tax, so no foreign tax credit exists to offset the American bill. The result is a small US liability on a gain you thought was tax free.

So plan disposals with both systems in view. Splitting a sale across two tax years can help in Britain, yet it does nothing for the American calculation. The right answer depends entirely on your own numbers. It rarely matches what a single-country adviser would suggest.

A worked example

Take an illustrative example. An American in Manchester bought Bitcoin across 2021, 2022 and 2023, then sold half in June 2025 for £40,000. Her UK gain uses the pooled average cost of all three purchases, producing a gain of roughly £12,000.

Her US calculation identifies the specific coins sold, which happened to be the most expensive lot. That produces a smaller dollar gain. She pays UK capital gains tax on the larger figure, then credits it against the smaller US liability, which absorbs it entirely.

What if you trade actively?

Volume changes the character of the activity. Most people, however often they trade, remain investors in both systems, so gains stay capital. Genuine trading as a business is rare, and each country tests it differently.

Britain looks at badges of trade: organisation, frequency, financing and intention. America asks whether you meet a demanding trader standard, which few casual investors approach. Guessing wrong in either direction changes the rate and the reliefs available.

Volume also multiplies the work. Thousands of transactions make manual reconciliation impossible, so specialist software becomes necessary rather than optional. Budget for it, and pick a tool that can produce both a pooled UK calculation and a lot-based US one.

Losses: where they help and where they do not

Both countries let capital losses offset capital gains, and both allow carrying losses forward. Neither lets a crypto tax loss reduce ordinary salary in any meaningful way, which disappoints people after a bad year.

Claim them properly all the same. In Britain losses generally need reporting to be usable later, and in America they run through the same schedule as gains. A documented loss today is genuine relief against tomorrow, so never leave one unrecorded.

Record keeping: the part that decides everything

Crypto records age badly. Exchanges close, people abandon wallets, and the CSV you never downloaded becomes unrecoverable. So the discipline is simple: export everything annually, and store it where you will find it in five years.

Full transaction exports from every exchange, downloaded each year rather than on demand
Wallet addresses and the dates you controlled them, to prove internal transfers
Sterling and dollar values at the moment of each disposal, not just the crypto amounts
Staking and mining reward records, with the value at receipt
Notes on any hard forks, airdrops or lost access events

The mistakes and penalties that follow bad crypto records

Crypto tax errors rarely come from dishonesty. They come from data. These are the ones we untangle most often, and each is far cheaper to prevent than to repair:

Reusing one country's gain figure on the other country's return.
Counting wallet-to-wallet transfers as disposals, which inflates both calculations.
Forgetting that swapping token A for token B is a disposal of token A.
Missing staking income entirely, because no cash ever arrived in a bank account.
Losing exchange history after an account closure, then estimating years later.
Ignoring the reporting side — crypto held on a foreign exchange can affect asset disclosures.

That last point is worth checking properly. Whether crypto belongs on foreign asset reporting depends on how and where you hold it. That position keeps tightening as reporting rules evolve. Our guide to the international forms you may owe maps that territory.

What is changing in reporting?

Both countries are building visibility. Exchanges increasingly report user transactions to tax authorities. International frameworks extend that data sharing across borders too. The practical effect is simple: unreported disposals become discoverable rather than invisible.

So the planning assumption should be transparency rather than obscurity. Anyone carrying unreported crypto years is far better fixing them deliberately than waiting for a letter. Our streamlined filing guide covers the American catch-up route where returns were missed entirely, and the same logic applies on the British side.

How US UK Tax Accountants helps

We build both crypto tax calculations from one clean dataset. The UK pooling and the US lot tracking then come from the same reconciled history. Our cross-border tax planning through treaty relief covers the credit positions that stop the same gain being taxed twice.

In our practice we see crypto cases fail on records rather than rules. So we start with the data itself, tell you honestly what can be reconstructed and what cannot, and quote a fixed fee in writing before any work begins.

Get your crypto position straight

If your crypto tax has only ever been calculated for one country, the other side is almost certainly wrong. Tell us which exchanges you used and roughly what you traded. We will scope the reconciliation properly and quote a fixed fee in writing. Book a consultation and hear back within one working day.

Last reviewed 9 September 2026 by the US UK Tax Accountants Tax Team. This article is general information, not personal tax advice — speak to a qualified US/UK tax adviser about your own position.

For the neighbouring question, Share schemes across two countries: RSUs, options and the vesting trap walks through it in detail.

For the neighbouring question, US sales tax for UK online sellers: when American states expect you to collect walks through it in detail.

For the neighbouring question, Crypto on a streamlined filing: rebuilding years of UK exchange trades walks through it in detail.

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Double tax treaty relief

Primary sources

Official guidance from the IRS, FinCEN and GOV.UK. Thresholds and rates on those pages are updated annually — check the current tax year before relying on a figure.

Crypto tax across two systems: what dual filers actually owe