UK retail crypto investors are sometimes told that the tax position is "unclear" or "still being worked out". Neither is true as of 2026. HMRC has published the Cryptoassets Manual, which now runs to over 200 pages of internal guidance binding on HMRC officers. The self-assessment return for tax year 2024-25 onward includes a dedicated cryptoasset section in the SA108 capital gains pages. The treatment is, as a matter of HMRC policy, well documented.
This article walks through what a typical UK retail crypto investor needs to file: the section 104 pooling rule, the trading vs investing distinction, the income-vs-capital classification of staking and airdrops, and the deadlines.
The section 104 pool
The single most important thing to understand for UK crypto tax is that HMRC does not let the taxpayer pick which lot they sold. Under section 104 of the Taxation of Chargeable Gains Act 1992, all units of the same asset held by the same taxpayer go into a single "pool" with a single weighted-average cost basis.
If you bought 1 BTC at £25,000, then 1 BTC at £45,000, then sold 0.5 BTC, the cost basis of the 0.5 BTC sold is half of the pool average: 0.5 × ((£25,000 + £45,000) / 2) = £17,500. The remaining pool has 1.5 BTC at the same average. There is no FIFO, LIFO or HIFO choice - just one pool.
Two exceptions to the section 104 rule, both narrow:
- Same-day rule. Disposals are first matched against acquisitions on the same day, not the pool. If you bought 1 BTC and sold 1 BTC on the same day, the cost basis of the sale is the price of the same-day purchase, not the pool average.
- Bed-and-breakfast rule (30-day rule). Disposals are then matched against acquisitions within the next 30 days, before going to the pool. This is the UK’s anti-loss-harvesting rule: you cannot sell a loss and re-buy within 30 days to crystallise the loss for tax purposes. This is the major structural difference between UK and US crypto taxation.
Trading vs investing
HMRC treats most retail crypto activity as investing, not trading. The distinction matters because trading income is subject to income tax (rates up to 45 percent plus National Insurance) while investing gains are subject to capital gains tax (rates of 10 or 20 percent depending on income band, after the annual exempt amount).
The Cryptoassets Manual at CRYPTO20250 sets out the test for when crypto activity rises to the level of "trading", drawing on the badges of trade established by the Royal Commission on the Taxation of Profits and Income in 1955. The relevant factors are: frequency, organisation (running it like a business), profit motive, and the source of finance.
HMRC’s consistent position is that trading status for crypto is rare for retail. Even high-frequency individual trading typically falls short of the threshold. The cases where retail does rise to trading status are usually those involving an organised business structure, dedicated trading premises, or external finance specifically raised for trading.
For the typical UK retail investor with a Coinbase, Binance or Kraken account, the assumption should be that all crypto activity is investing, subject to capital gains tax. Filing as a trader without explicit advice from a UK chartered tax adviser is almost certainly the wrong call.
Staking, airdrops and lending
HMRC treats staking rewards, airdrops, and crypto lending interest as miscellaneous income at the moment of receipt, valued at the GBP fair market value on the day. The relevant manual sections are CRYPTO21200 (mining and staking) and CRYPTO21250 (airdrops).
Two practical wrinkles:
Trading allowance. The first £1,000 of miscellaneous income each tax year is exempt from income tax under the trading allowance. Most retail stakers with under £1,000 of annual rewards have no income tax liability on the rewards themselves; only the eventual capital gain when they sell the rewards is taxable.
Airdrops without service. The CRYPTO21250 page distinguishes between airdrops received in exchange for some service (a tweet, a referral) and airdrops received passively. The latter may not be income at all, only entering the section 104 pool at zero cost. The classification depends on whether the recipient did anything to qualify.
The annual exempt amount
The UK CGT annual exempt amount has been progressively reduced: £12,300 in 2022-23, £6,000 in 2023-24, £3,000 from 2024-25. For tax year 2026-27 the allowance remains £3,000 unless changed in the Autumn Budget.
The practical impact for retail crypto investors is that the threshold for needing to file at all has fallen sharply. A taxpayer with £5,000 of net realised gains in 2026-27 owes CGT on £2,000 (the excess over the allowance). A taxpayer with £2,500 of net realised gains owes nothing but, per the HMRC reporting threshold guidance, may still need to report if the disposals proceeds exceeded £50,000 in the year.
The deadlines
| Event | Deadline |
|---|---|
| UK tax year ends | 5 April |
| Register for self-assessment (if not already) | 5 October following the tax year |
| Paper self-assessment return | 31 October |
| Online self-assessment return | 31 January following the tax year |
| Capital gains tax payment due | 31 January following the tax year |
For tax year 2025-26 (ending 5 April 2026) the online filing and payment deadline is 31 January 2027.
The numbers HMRC sees
Worth keeping in mind: HMRC receives data on UK customers from the major centralised exchanges under the OECD’s Cryptoasset Reporting Framework (CARF). The framework is being implemented in the UK from January 2026, with first reports due in 2027. By the time a taxpayer files their 2025-26 return, HMRC will already have a list of UK persons with accounts at the participating exchanges. Failure to file is more likely to be detected than it was a few years ago.
Tools designed for the US treatment of crypto (FIFO per wallet, no wash sale rule, no annual exempt amount) produce numbers that are not directly usable on a UK return. Our Crypto Tax Calculator ships with an explicit UK mode that applies section 104 pooling, the same-day and 30-day matching rules, and the current annual exempt amount, producing a report formatted for the SA108 capital gains pages. The free preview will tell you whether you owe anything before you commit to filing.