CryptoTax UK · Guide
UK Crypto Tax Deadline Checklist 2025/26
Missing HMRC deadlines results in automatic penalties. This checklist covers every key date for crypto investors filing a Self Assessment for 2025/26. Educational only — not tax advice.
Calculate my gains before the deadline →Key dates for 2024/25 (now overdue for most)
Tax year end: 5 April 2025. Register for Self Assessment (if new): 5 October 2025. Online filing deadline: 31 January 2026. Payment deadline: 31 January 2026. If you missed these dates, file and pay as soon as possible to minimise penalties.
Key dates for 2025/26
Tax year end: 5 April 2026. Register for Self Assessment (if new): 5 October 2026. Paper filing deadline: 31 October 2026. Online filing deadline: 31 January 2027. Payment deadline: 31 January 2027.
Real Time Capital Gains Tax reporting
From April 2026, HMRC is consulting on requiring Real Time CGT reporting for certain assets. Crypto investors should watch for updates.
Your pre-filing checklist
Export all exchange and wallet transaction histories. Apply HMRC matching rules. Calculate gains and losses. Subtract Annual Exempt Amount. Register for Self Assessment if needed. Complete SA100 and SA108. File and pay by 31 January.
Frequently asked questions
What is the penalty for filing late?
An automatic £100 penalty applies if your return is filed even one day late. Further penalties apply at 3 months (£10/day up to 90 days), 6 months (5% of tax due) and 12 months (further 5%).
Can I get an extension on the filing deadline?
HMRC does not routinely grant extensions for Self Assessment. In exceptional circumstances HMRC may consider a waiver of penalties — contact HMRC proactively if you are unable to file on time.
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Calculate my gains before the deadline →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.