Build a clearer acquisition-to-disposal audit trail for UK Self Assessment.
Official recordkeeping
HMRC says individuals must keep their own cryptoasset transaction records, including asset type, date, units, sterling value, cumulative holdings, wallet addresses, and supporting bank information.
Read the official HMRC guidance →Filing calendar
For the 2025–26 tax year, paper Self Assessment returns are due 31 October 2026 and online returns and payment are due 31 January 2027.
Verify the current official deadline →Download complete exchange, wallet, income, reward, and fee records before access or retention periods expire.
Check duplicates, missing values, transfers, fiat valuation, and cost information without changing the original files.
Apply the country’s rules with current official guidance or a qualified adviser before filing.