# HMRC Self Assessment reminder for crypto users

Tax reminder (9 January 2024): HMRC reminded cryptoasset users to check whether gains or income require a Self Assessment tax return — including swaps, staking rewards and airdrops. Keep exchange CSVs and use our tax hub; this is not HMRC advice. See the gov.uk news item for the official wording.

## Who might need to file

You may need Self Assessment if total taxable gains exceed the annual exempt amount, or if proceeds exceed £50,000 in a tax year (even if gains are below the allowance). Crypto-to-crypto swaps count as disposals.

## Records to keep

Download CSV history from every exchange and DeFi platform you used. Note wallet addresses, dates, amounts in sterling, and fees. Section 104 pooling applies — our tax hub explains calculation.

## What changed since 2024

CARF data collection began January 2026, increasing HMRC visibility. Undeclared earlier years may still be corrected through disclosure — waiting increases penalty risk.

## Sources

- [Primary source](https://www.gov.uk/government/news/tax-return-reminder-for-cryptoasset-users)

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— Digital Assets UK (https://digital-assets.co.uk/news/tax-return-reminder-for-cryptoasset-users/), reviewed 2024-01-09. Source: https://www.gov.uk/government/news/tax-return-reminder-for-cryptoasset-users