CryptoTax UK · Guide
Crypto Tax Without Records UK — HMRC Guide
Lost your crypto transaction history? HMRC expects you to keep records, but there are ways to reconstruct your history if records are missing. This guide explains your options. Educational only — not tax advice.
Calculate from available records →HMRC's record-keeping requirements
HMRC requires you to keep records to support your Self Assessment return for at least 5 years after the January filing deadline. For crypto this means records of every acquisition and disposal: date, asset, quantity and GBP value.
How to reconstruct missing records
On-chain transactions are permanent and recoverable via block explorers (Etherscan, Blockchain.com, Solscan). Contact exchanges to request historical account statements. Price feeds such as CoinGecko and CoinMarketCap historical data can help establish GBP values at specific dates.
Making a reasonable estimate
If you genuinely cannot recover all records, HMRC may accept a reasonable estimate based on available evidence. Document your reconstruction methodology carefully.
Frequently asked questions
Can I use blockchain explorers to recover my history?
Yes — all on-chain transactions are permanent and publicly visible. Use your wallet address on the relevant blockchain explorer to recover your full transaction history.
What if an exchange I used has closed down?
Try to recover records from any emails, screenshots or statements you have. If records are truly unrecoverable, document your efforts and make a reasonable estimate based on any available evidence.
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Calculate from available records →Educational guidance only. CryptoTax UK is not a regulated tax adviser and the information above does not constitute tax, legal or financial advice. Always confirm your specific position with HMRC or a qualified accountant before filing.