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Crypto tax deadlines: United Kingdom
HMRC charges Capital Gains Tax when you dispose of cryptoassets and your total gains for the tax year are above the tax-free allowance. You report them through Self Assessment or the Capital Gains Tax real time service.
| Date | What's due | Source |
|---|---|---|
| Register for Self Assessment (first return) | HMRC, checked 2026-10-21 | |
| Paper tax return deadline | HMRC, checked 2026-10-21 | |
| Online return deadline if you want to pay through your tax code | HMRC, checked 2026-10-21 | |
| Online tax return and payment deadline | HMRC, checked 2026-10-21 | |
| Second payment on account | HMRC, checked 2026-10-21 |
If you register after 5 October 2026, HMRC sets a filing deadline 3 months from its letter, but payment is still due by 31 January 2027.
Deadlines can move (weekends, holidays, disaster relief). Always confirm on the official HMRC page before you file. Educational, not financial advice.
Estimate the tax first
Use HMRC's own tools on GOV.UK. Our calculator uses US rules, so it doesn't apply to UK tax.
- GOV.UK: Estimate your Self Assessment tax bill
- GOV.UK: Capital Gains Tax allowances
- GOV.UK: Report and pay your Capital Gains Tax
Official sources
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