According to the source, UK residents must report and pay tax on cryptoasset disposals and income under Self Assessment even if they have not received a letter, because the duty to notify rests with the taxpayer under HMRC guidance and compliance rules, source: HMRC. For 2024/25, crypto is treated as property subject to Capital Gains Tax on disposals with rates of 10 percent or 20 percent depending on income band, and the annual exempt amount is £3,000 per individual, source: HMRC. Crypto income from staking, mining, and many airdrops is generally taxable as income when received, and later disposals of those tokens can also trigger Capital Gains Tax, source: HMRC. Key dates for traders include the end of the tax year on 5 April and the online Self Assessment filing and payment deadline on 31 January following the end of the tax year for example 31 January 2026 for the 2024/25 year, source: HMRC. Reporting is required if you have Capital Gains Tax to pay or if total disposal proceeds exceed four times the annual exempt amount which is £12,000 for 2024/25, and allowable losses can be claimed to offset gains and carried forward if reported on time, source: HMRC. HMRC applies share matching rules to crypto including same day, 30 day matching, and Section 104 pooling which affects calculated gains and loss harvesting strategies for active traders, source: HMRC.