How to avoid tax on crypto UK, seven ways that are legal

There are two meanings of avoiding tax on crypto, and only one of them ends well. Hiding gains stopped being a strategy in January 2026, when UK platforms began collecting identities and transactions for HMRC, and 81,172 warning letters went out last year on the older, weaker data. What remains, and what this page is about, is the legal kind: the allowances, reliefs and timing rules Parliament wrote, used deliberately. Seven of them do almost all the work.

1. Use the £3,000 allowance, every year

The annual exempt amount makes your first £3,000 of gains each tax year free. It resets every 6 April and unused allowance vanishes. A holder sitting on a large unrealised gain can dispose of slices across several tax years and take £3,000 tax free in each, instead of one lump that gets the allowance once. Modest sums per year, but it compounds, and it costs nothing except patience. The CGT allowance for 2026 to 2027 shows how much of this year’s is still sitting unused.

2. Realise losses, and actually claim them

Losses offset gains pound for pound, and once claimed, unused losses carry forward without expiry. Two applications matter. First, in a year you have taken gains, look at what is underwater, realising a loss before 5 April shelters gains in the same year. Second, tokens that have become worthless, dead projects, rugpulls, can ground a negligible value claim under section 24 TCGA 1992, which HMRC applies to crypto at CRYPTO22400, producing a loss without finding a buyer for the corpse. Losses generally must be claimed within four years, a forgotten bad year is relief thrown away.

3. Mind the 30-day trap while doing it

Sell a token to realise a loss and buy it back three days later, and the 30-day rule matches your sale to the repurchase, not your original pool, usually erasing the loss you wanted. Wait 31 days to rebuy, or accept the exposure gap. This rule rewrites more DIY loss plans than any other, and it is precisely the kind of matching a proper computation shows you before HMRC’s view of it surprises you.

4. Transfers between spouses, the legal free move

Section 58 TCGA 1992 treats a transfer between spouses or civil partners living together as made for a consideration giving neither gain nor loss, and gov.uk says the same thing in plainer words. They inherit your original cost, and a later sale uses their £3,000 allowance and their tax band. A couple can shelter £6,000 of gains a year on allowances alone, and if one partner pays basic rate while the other pays higher, routing the disposal through the 18% band instead of 24% saves a quarter of the tax on that slice. The spouse transfer calculator puts your own two sets of allowances and bands against a gain to show what the move is worth. Married couples and civil partners only, the same gift to anyone else is itself a disposal at market value.

5. Keep gains in the 18% band

CGT is 18% inside your basic rate band, 24% above it, and the band is measured on income plus gains together. So the planning space is anything that keeps the total lower: taking gains in a low-income year, a sabbatical, a year of self-employment losses, or splitting a disposal across two tax years so neither spills far into 24%. Pension contributions extend the basic rate band, which can pull a slice of gain from 24% back to 18%, a real effect worth checking with a professional against your own numbers before relying on it. To see where your own band boundary falls, put your income and the gain into the capital gains tax calculator and it shows the split with the working.

6. Time disposals across tax years

The tax year boundary at 5 April is the cheapest planning tool that exists. A disposal on 5 April and one on 6 April sit in different years, each with its own allowance, each settled on a different January deadline a full year apart. Deferring a sale by days can mean two allowances instead of one and twelve extra months to pay. None of this requires structures or advice, only a calendar and knowing your position before you act, which is what sell now or after April prices out for a disposal you are already weighing.

7. Give to charity, if you were giving anyway

Assets given to charity carry no Capital Gains Tax, so donating appreciated crypto directly beats selling it and donating cash, the gain simply never gets taxed. This is a way to make generosity cheaper, not a way to get richer, but for people who give, giving the coins is strictly better than giving the proceeds.

What is not on this list

Not withdrawing to your bank, moving coins between your own wallets and calling it something else, offshore exchanges, and “HMRC cannot see DeFi”, all of which are either non-events for tax or evasion with extra steps, and we take them apart in crypto tax myths. Moving abroad deserves its own honest sentence: real, permanent emigration changes your tax position, but the temporary non-residence rules claw back gains if you return within five years, and anyone planning a large disposal around residence should be paying a professional, not reading blogs.

Every technique above depends on knowing your actual position first, which gains are unrealised, what losses are available, where your band sits. That computation, every disposal matched under the HMRC rules with the rule cited, is what gains.tax produces in your browser, from your own files, free under 1,000 transactions. Plan from numbers, not vibes.

General information, not tax advice, and the difference matters more on this page than most.