Self Assessment for crypto — step-by-step UK guide
Quick answer: 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).
If you have taxable crypto gains or income, you may need to complete a Self Assessment tax return each year. This guide walks through the process in order.
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.
Frequently asked questions
Can I amend a return?+
Yes. You can amend online within 12 months of the filing deadline if you made an error.