The single most misunderstood point about cryptocurrency in the UK is that HMRC does not treat it as money. The HMRC Cryptoassets Manual is unambiguous on this: tokens such as Bitcoin, Ether and the broader universe of cryptoassets are property, not currency, and the tax outcome of any disposal flows from that classification. For UK-resident individuals, that almost always means Capital Gains Tax (CGT) on disposals rather than income tax, although the boundary is more nuanced than it first appears.
How HMRC classifies cryptoassets
The manual divides cryptoassets into broad categories: exchange tokens (Bitcoin and similar), utility tokens, security tokens, stablecoins and, more recently, non-fungible tokens. The tax treatment is not driven by the technology but by what the holder is actually doing economically. A retail investor buying Bitcoin on a UK-licensed exchange and holding for two years is in a fundamentally different position from someone running an automated trading bot with a hundred transactions a week.
The taxable events
A common misconception is that crypto is only taxed when converted to sterling. HMRC's position is that a disposal occurs whenever ownership of the asset changes, which includes:
- Selling crypto for fiat currency (GBP, USD, EUR).
- Exchanging one cryptoasset for another (e.g. swapping ETH for SOL). This is the surprise for many investors. A crypto-to-crypto trade is two events: a disposal of the first asset and an acquisition of the second.
- Using crypto to pay for goods or services.
- Gifting crypto to someone other than a spouse or civil partner.
Share-pooling rules apply to crypto
For CGT purposes, HMRC requires individuals to apply share-pooling rules to identical tokens, similar to how disposals of shares are matched. The Section 104 pool is the running average cost of all units of a particular token held by the individual. When a disposal happens, the cost basis used is the average pool cost, not first-in-first-out or last-in-first-out. Two specific matching rules sit on top of this:
- The same-day rule: Tokens acquired and disposed of on the same day are matched first, separately from the pool.
- The 30-day rule (bed-and-breakfasting): Tokens acquired in the 30 days following a disposal are matched next, again separately from the pool. This stops investors from selling and immediately rebuying to crystallise a loss.
The annual exempt amount
The CGT annual exempt amount fell to £3,000 from April 2024, a dramatic reduction from the £12,300 available a few years earlier. The practical consequence for crypto investors is that even modest gains now produce a reportable position. Above the allowance, basic-rate taxpayers pay 18% on chargeable assets (post-Autumn Budget 2024 rates), and higher- and additional-rate taxpayers pay 24%.
Record-keeping is the binding constraint
The biggest practical challenge for UK crypto holders is not the rate of tax but the sheer record-keeping burden. Every disposal requires a sterling-equivalent value at the date of the transaction, the matched cost basis under the pooling rules, and supporting documentation. Investors who move tokens between exchanges, wallets and DeFi protocols often discover at year-end that the audit trail is incomplete. Software such as Koinly, Recap and CoinTracking can ingest exchange and on-chain data and produce CGT computations consistent with HMRC's pooling methodology, which substantially reduces the manual workload.
Reporting and deadlines
Crypto gains and losses are reported through Self Assessment, with the capital gains supplementary pages required where gains exceed the annual exemption or total proceeds exceed four times the exemption. The Self Assessment deadline of 31 January following the tax year still applies. There is no real-time CGT reporting requirement for crypto in the way there is for UK residential property.
How PushDigits supports crypto investors
As ICAEW Chartered Accountants we work with UK-resident crypto investors at every level, from holders with a single Coinbase account to active traders managing dozens of wallets and DeFi positions. We reconcile exchange exports, apply the pooling rules correctly and integrate the output into your annual return. To discuss your position, see our tax planning and Self Assessment pages, or book a consultation.