How Your Salary Decides the Tax You Pay on a Crypto Gain

Capital gains tax on cryptoassets in the UK is charged at 18% or 24%, and the thing that decides which rate applies to you is not the coin, the exchange or how long you held it. It is your income. HMRC does not treat crypto as money. It treats it as an asset, so selling it, swapping one token for another, spending it on goods or giving it away to anyone other than a spouse all count as disposals, and any profit drops into the same capital gains calculation used for shares.

What surprises people is the final step. Your gain sits on top of your employment income for the year, and whatever part of it pokes above the higher rate threshold is taxed at 24% rather than 18%. Two people can make an identical £20,000 profit on the identical token in the identical week and end up hundreds of pounds apart, purely because one of them earns more. Working out the difference is arithmetic rather than judgement, which is why plenty of people handle it themselves. It only becomes a job for a crypto tax accountant who works with UK investors once the transaction history gets messy enough that the matching rules stop being obvious.

The rates themselves have only been at this level since 30 October 2024, when the main rates rose from 10% and 20% in the middle of a tax year. That mid-year jump created a genuinely awkward filing exercise, because disposals before and after Budget day were taxed differently, and anyone still reconciling old returns will recognise the problem of a tax year effectively split into two rate periods. For disposals made now, in the 2026/27 tax year, the position is simpler: 18% inside your unused basic rate band, 24% above it.

Before the rates bite, you get an allowance. The annual exempt amount is £3,000 of gains per person per tax year. It covers gains across all your assets rather than crypto alone, and it does not roll forward, so if you have not used it by 5 April it simply disappears. The allowance has been cut hard over recent years, down from £12,300 as recently as 2022/23, and the long slide in the exempt amount is the main reason ordinary investors now find themselves filing capital gains pages for the first time. Worth noting that the Treasury can revisit both rates and allowances at any fiscal event, so the figures used here are the ones applying at the time of writing and are always worth re-checking before you file.

Your salary sets the point where 18% becomes 24%

The calculation runs in a fixed order. Add up your gains for the tax year and subtract your allowable losses. Take off the £3,000 annual exempt amount. Then work out how much of your basic rate band is still unused once your income has been counted, and tax the remaining gain at 18% up to that point and 24% beyond it.

With the personal allowance at £12,570 and the basic rate band at £37,700, the higher rate threshold sits at £50,270. The gap between your taxable income and that number is the slice of gain that qualifies for 18%.

Take someone earning £45,000 who sold ETH at a £20,000 profit. Their unused basic rate band is £5,270. Their taxable gain after the allowance is £17,000. The first £5,270 is taxed at 18%, giving £948.60, and the remaining £11,730 is taxed at 24%, giving £2,815.20. Total bill: £3,763.80.

Now run the same disposal for someone earning £32,000.

Same coin, same profit, £703.80 difference. This is why the question "what is the crypto tax rate in the UK" has no single answer, and why the useful first step is pinning down where your salary actually lands after pension deductions and salary sacrifice. Our take-home pay calculator gives you that figure, and every step afterwards depends on it.

One wrinkle for Scottish taxpayers. Scotland sets its own income tax bands, and the Scottish higher rate starts well below £50,270. Capital gains tax, however, is not devolved, so the basic rate band used for the 18% slice is the UK one. A Scottish taxpayer can therefore be paying Scottish higher or advanced rate income tax on salary while still having room left in the UK basic rate band for gains. It catches people out in both directions.

Two levers that move the split point

A gross personal pension contribution extends your basic rate band by the amount contributed. For capital gains that is an unusually direct trade: every £1 of gross contribution shifts £1 of gain from 24% down to 18%, worth 6p of tax per pound on top of the income tax relief on the contribution itself.

Returning to the person on £45,000, a £5,000 gross personal pension contribution pushes the unused band from £5,270 to £10,270. Five thousand pounds of gain moves down a rate and the capital gains bill falls from £3,763.80 to £3,463.80. Gift Aid donations extend the band in the same way. Neither is free money, of course, since a pension contribution ties the cash up until at least age 55, rising to 57 from April 2028, and a charitable donation is money given away.

The second lever is transfers between spouses and civil partners. Assets move between them on a no gain, no loss basis, so nothing is taxed at the point of transfer. Whoever holds the asset when it is finally sold uses their own £3,000 allowance and their own unused basic rate band, which can double the allowance available to a couple and shift a slice of gain into the lower rate. What matters to HMRC is that the transfer is genuine and outright, not a paper arrangement where the sale proceeds quietly find their way back.

Neither lever is unique to crypto. They are the standard mechanics of any capital gain, which is precisely why two households sitting on the same £20,000 profit can end up paying noticeably different amounts of tax on it.

Why automated calculations go wrong

Because HMRC's share identification rules run in a specific order, and tools built primarily for US investors do not follow it. The UK does not use FIFO. Before anything reaches a pool, two rules apply in sequence.

The same day rule matches any disposal against acquisitions of the same token made on the same day. The thirty day rule then matches a disposal against any repurchase of the same token within the following 30 days, rather than against your existing holding. That second rule is the one that quietly breaks the old habit of selling before 5 April and buying back the following Monday.

Anything left over goes into a Section 104 pool, which is a single running average cost for each token you hold. Buy 1 ETH at £1,200, another at £1,800, a third at £2,400 and a fourth at £3,000 and you hold 4 ETH at a pooled cost of £2,100 each. Sell one for £2,700 and the gain is £600. You do not get to nominate which coin you sold.

Most established UK-aware tools handle pooling competently. The 30 day rule is where things slip, particularly when the repurchase window straddles 5 April and the buyback lands in a different tax year from the sale, or when a token is bought back on a different exchange or in a different wallet and the software fails to recognise it as the same asset. Practitioners who work through the same day and 30 day traps transaction by transaction tend to find the errors cluster around exactly these edges. Awkwardly, a mis-run match more often produces a smaller gain than the correct figure rather than a larger one, which makes it both the version nobody questions and the version that turns into penalties and interest later.

Valuation is the other soft spot, and it bites hardest on thinly traded tokens. A swap of one token for another is a disposal at market value in pounds, and where the market is shallow or the price feed unreliable the number you record is an estimate you may have to defend. Anyone holding assets that arrived through a new listing should understand how liquidity, market making and listing arrangements shape what a token is actually worth on any given day, because a quoted price and an achievable price are not always the same thing.

Filing, deadlines and what exchanges now send HMRC

Crypto gains are reported on the SA108 capital gains pages, filed alongside the SA100 Self Assessment return. Online filing and payment are both due by 31 January after the end of the tax year, so disposals made in 2026/27 are payable by 31 January 2028.

You may need to report even in a year with no tax to pay. If you already file a return, the capital gains pages are generally required once total disposal proceeds for the year exceed £50,000, even where the gain sits comfortably under the £3,000 allowance. That is proceeds, not profit: sell £60,000 of BTC that cost you £58,000 and you are over the threshold on a £2,000 gain. If you do not currently file, you will need to register once you have tax to pay, and HMRC's reporting requirements for non-filers have shifted in recent years, so it is worth checking the current criteria on GOV.UK rather than relying on an older figure.

Losses deserve attention in a year when nothing is owed. Claimed losses carry forward indefinitely against future gains, but the claim itself must generally be made within four years of the end of the tax year in which the loss arose. Leave them off the return and the relief can simply be lost.

Since 1 January 2026, UK exchanges and service providers have been required to collect users' tax residency and transaction data under the Cryptoasset Reporting Framework, with the first reports covering the 2026 calendar year due to HMRC by 31 May 2027 and then exchanged automatically with other participating jurisdictions. This is already in force rather than under consultation. HMRC was sending nudge letters to crypto holders well before CARF, using data obtained directly from UK platforms. From 2027 the data arrives without anyone needing to ask for it.

When the bill and the market move in opposite directions

There is a timing risk that sits outside the tax rules but ruins more people's Januarys than any matching error. Tax is charged on the gain in the year the disposal happens, not on what the proceeds are worth when the bill falls due. Sell in May 2026, reinvest immediately in another token, watch that token halve by the following autumn, and the tax on the original gain is still payable in full. The obvious defence is dull and effective: set the estimated tax aside in cash as each disposal happens rather than leaving it invested.

Staking and lending rewards add a second layer, because they are normally taxable as income when received, at your marginal rate, with the sterling value at that point becoming the base cost for a later capital gains calculation. Someone who receives rewards steadily through a rising market and then sells into a falling one can face an income tax bill measured against values that no longer exist.

A dozen straightforward buy and hold trades on one exchange, in one tax year, with nothing repurchased inside 30 days, is a job most people can do themselves in an afternoon. It gets harder quickly with multiple exchanges and self-custody wallets, staking and DeFi positions, transfers between your own accounts that look like disposals to the software, or a year with hundreds of swaps where same day and 30 day matching has to run in order before the pool average means anything at all. Somewhere in there, professional help costs less than the errors.

Whichever route you take, the records are the thing. Reconstructing three years of wallet history after the event is expensive, slow and rarely produces a figure anyone feels confident defending, and it is a large share of the remedial work accountants in this field are asked to do.