Cryptocurrency Tax in the UK — HMRC Rules and Self Assessment

HMRC generally treats cryptocurrency as a capital asset for individual investors, meaning gains and losses are subject to Capital Gains Tax (CGT). However, if you're trading frequently or operating as a business, HMRC may classify your activities as trading income subject to Income Tax and National Insurance contributions.

Under HMRC's share pooling rules, all tokens of the same type (e.g., all Bitcoin holdings) are treated as a single pooled asset. When you dispose of tokens, the cost basis is calculated using the average cost of all tokens in that pool, rather than identifying specific tokens purchased at different times.

Staking rewards are treated as taxable income at their market value when received. This income must be reported on your Self Assessment if it exceeds your personal allowance. When you later dispose of the staked tokens, any gain or loss from the original receipt value is subject to Capital Gains Tax.

You must report cryptocurrency gains on your Self Assessment if your total capital gains exceed the annual exempt amount (£6,000 for 2023-24 tax year), or if your gross disposals exceed four times the annual exempt amount, regardless of whether you made a gain or loss.

HMRC requires you to keep detailed records including dates of transactions, transaction values in GBP, exchange rates used, wallet addresses, transaction fees, and the reason for each transaction. These records must be maintained for at least five years after the 31 January submission deadline of the relevant tax year.