Your coins have an address for tax, and it is wherever you live

The IRS defines it as any digital representation of value recorded on a cryptographically secured distributed ledger or similar technology. That covers convertible virtual currencies, stablecoins and non-fungible tokens. The definition is deliberately wide.

Wherever you are. HMRC's manual concludes that exchange tokens are a new kind of intangible asset, so the location follows the residency of the beneficial owner. The exchange's own location does not enter into it.

That single rule removes most of the imagined planning. A UK resident holding tokens on a platform in Singapore holds UK-situs assets for these purposes.

The manual describes the approach as clear, logical and predictable, which it is. It also means the remittance-style thinking that works for some foreign assets does not apply here.

A direct question, on the return itself. The IRS states that on federal income tax returns you must answer yes or no to the digital asset question, and the answer is a statement made under penalties of perjury.

That design is deliberate. It converts a reporting question into a declaration, which changes the consequences of getting it wrong.

Answer it honestly even where no tax arises. Holding without transacting is a different answer from selling, and both are better than a wrong one.

Yes, in both systems, and this catches more people than anything else. Exchanging one token for another disposes of the first, so a gain or loss crystallises even though no currency ever left the platform.

Traders who never cashed out therefore have years of taxable events behind them. The cash position and the tax position are unrelated.

Where prices fell afterwards, the position can be genuinely painful: tax on gains realised in one year, with losses sitting in the next.

Considerably, even on identical trades. HMRC's cryptoassets manual applies pooling rules to work out the cost of what you sold, while the American system identifies units by its own methods. Two people following both sets of rules correctly will therefore report different gains on exactly the same transactions.

Britain also gives an annual exempt amount for gains and taxes what remains at capital gains rates. America has no equivalent allowance and distinguishes short-term from long-term holdings by a one-year line.

So the same sequence of trades produces two different gains, two different rates and two different years of charge.

GOV.UK's guidance on tax and cryptoassets collects the British side in one place.

That depends on how you hold, and the current instructions decide it rather than any summary, this one included. The FBAR reaches foreign financial accounts, and Form 8938 reaches specified foreign financial assets, with the IRS comparing the two.

Holding through a foreign platform that also holds ordinary currency for you raises different questions from holding in a wallet whose keys only you control.

We read the current instructions each year rather than relying on last year's note, because guidance in this area has moved more than once.

Our article on Form 8938 and the FBAR covers how the two forms work for conventional accounts.

Rewards are generally income when you receive them, measured at their value on that date. That value then becomes your cost for a later disposal, which produces a second event when you sell.

Both systems follow broadly that shape, though the detail and the timing differ.

Keep the date and value of every reward. Reconstructing daily values a year later is the least rewarding work in cross-border tax.

Only in the ordinary way. No article mentions digital assets, so relief comes through the general machinery: the country of residence taxes, the other country credits, and the citizen provisions decide the order.

Because Britain locates the tokens with you, there is rarely an argument about which country has a claim. Both do.

The practical effect is a credit claim rather than an exemption. Our comparison of the exclusion and the foreign tax credit explains why the exclusion has nothing to work with here.

This is where the real cost sits. Exchanges close, apps change hands, and export formats differ from one platform to the next.

Download a full transaction history from each platform annually, in the most detailed format offered. Store it somewhere that does not depend on the platform still existing.

Note the date, both token amounts, the fiat value at the time, and any fee. Those four fields answer nearly every later question.

Our clients who export yearly finish a crypto return in an hour. The others pay us to rebuild histories from blockchain explorers, which is slow and imperfect.

Then the tokens arrive with you, and so does their history. Britain starts taxing disposals once you are resident here, using its own pooling rules applied to your whole holding rather than only to what you bought after arriving.

America has been taxing you throughout, because citizenship never stopped applying.

So the year of the move produces two overlapping calculations with different starting points. Plan any large disposal around that line rather than through it.

Losses matter more in crypto than in most assets, simply because the swings are larger. Each system has its own rules on how losses offset gains and how far they carry forward.

Crucially, a loss recognised in one country in one year may fall in a different year in the other. The two sets of books rarely align.

Claim them properly in both places. Our clients often overlook UK loss claims entirely, which is a straightforward way to overpay.

Keep the records that prove a loss for as long as you keep the ones proving a gain.

The IRS definition of a digital asset includes non-fungible tokens explicitly, so the same reporting framework applies to them. Selling one is a disposal, and buying one with another token disposes of that token too.

Valuation is harder and the principle is identical. Thin markets make the figure debatable rather than the rule unclear.

Where an NFT was created rather than bought, income questions arrive first. That is a different analysis from a collector's.

Reporting by platforms has expanded, and the pace differs by jurisdiction. Some send information to tax authorities; others send you a summary and nothing else.

Either way, the obligation rests with you. A platform that reports nothing does not reduce what your return should say, and one that reports everything does not complete it for you.

Assume the information will arrive eventually. Returns filed on that assumption age much better than those that gamble the other way.

Work through this once a year, in January, while the platforms still exist.

It rarely creates one on its own and it frequently enlarges one. A US citizen abroad already files, so crypto adds schedules rather than a new duty. In Britain, however, gains above the annual exempt amount can pull someone into Self Assessment who had never needed to register for it.

That registration has its own deadline, separate from the payment date.

So the first question is not what the crypto tax will be. It is whether a return is now due at all.

Some choices genuinely help, and none of them involve pretending the tokens are elsewhere. Timing a disposal across a year end changes which year bears the gain in each country.

Realising a loss deliberately can shelter a gain, subject to each system's own rules on how that works.

Holding for more than a year changes the American rate and does nothing for the British one, which is the kind of asymmetry worth knowing before you sell.

We model the two outcomes together, because optimising one country in isolation usually costs more in the other.

Take an illustrative year. An American in Manchester swaps one token for another twice, sells a third for pounds, and receives staking rewards each month.

Britain sees three disposals plus twelve income events, pools the costs, and applies the annual exempt amount to what remains. America sees the same three disposals, splits them by holding period, and taxes the rewards as income when received.

Neither answer is wrong, and the figures differ. The credit claim then has to align two calculations that were never designed to match, which is the actual work.

First, assuming no tax arises until crypto becomes cash. Second, treating a swap as a non-event. Third, answering the return's digital asset question carelessly.

Fourth, believing an offshore exchange puts the asset offshore for HMRC, when the location follows your residence.

Fifth, leaving exports until the platform has closed. Sixth, applying the UK annual exempt amount to the American calculation, where nothing of the kind exists.

We start from the transaction histories rather than from a summary, because the summaries platforms produce are built for one tax system at a time. From there we run the UK pooling and the US calculation separately and reconcile them.

Our US federal return service covers the American side and the reporting forms, and we prepare the Self Assessment position alongside it so the two agree.

If several years have gone unreported, tell us which platforms you used and we will tell you what can still be reconstructed and what it will take.