# Self Assessment for crypto — step-by-step UK guide

Register for Self Assessment by 5 October after the tax year you first owe tax. File online by 31 January and pay any tax due by the same date. Include crypto in the dedicated cryptoassets section (from 2024/25 returns onwards).

## Key facts
- Tax year runs 6 April to 5 April.
- Register online at gov.uk if you are not already registered.
- Online deadline: 31 January after the tax year ends.
- Keep records for at least 5 years after the deadline.
- Late filing triggers automatic penalties.

## Do you need to register?

You need Self Assessment if you have crypto gains above the annual exempt amount after losses, crypto income not taxed at source, or other reasons to file. Simply holding crypto without selling does not require a return.
## Key deadlines for 2025/26

Tax year 2025/26 ends 5 April 2026. Register by 5 October 2026 if newly required. File and pay online by 31 January 2027.
## What to include

Report each disposal: date, token, proceeds and costs in pounds. Report income (staking, mining, pay) separately. Use your records — exchange CSV files help but are not a full tax calculation.

## FAQs
### Can I amend a return?

Yes. You can amend online within 12 months of the filing deadline if you made an error.

## Sources

- [HMRC — Self Assessment](https://www.gov.uk/self-assessment-tax-returns)
- [HMRC — Cryptoassets collection](https://www.gov.uk/government/publications/tax-on-cryptoassets)

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— Digital Assets UK (https://digital-assets.co.uk/tax/self-assessment-crypto/), reviewed 2026-06-23. Source: https://www.gov.uk/self-assessment-tax-returns