Crypto Tax UK 2026 – HMRC Rules, CGT Rates & Self Assessment Guide

If you're a UK crypto investor, HMRC has been watching. They've been sending "nudge letters" to crypto holders for years, and they get exchange data from UK platforms. The good news: the rules are actually pretty reasonable — especially that £3,000 CGT exemption. Here's the full picture.

HMRC's View on Cryptocurrency

HMRC treats cryptocurrency as a capital asset — not currency, not gambling winnings. Practically, this means:

• Profits from selling crypto = Capital Gains Tax (CGT)
• Income from mining, staking, airdrops = Income Tax
• HMRC's detailed guidance is in the Cryptoassets Manual (CRYPTO)

Capital Gains Tax Rates for Crypto (2026)

Annual CGT Exemption: £3,000 per year (2024/25 and 2025/26). Gains below this threshold are tax-free.

What Triggers Capital Gains Tax in the UK?

• Selling crypto for GBP or other fiat
• Exchanging one crypto for another
• Spending crypto on goods or services
• Gifting crypto to anyone other than a spouse/civil partner
• Donating crypto to charity (but special relief may apply)

Not taxable: Buying crypto with GBP, transferring between your own wallets, gifting to spouse or civil partner.

The Section 104 Pool Rule

This is where UK crypto tax gets genuinely different from the US. Instead of FIFO, the UK uses Section 104 pooling:

• All your units of the same crypto get lumped into one pool
• The pool tracks a blended average cost across all your purchases
• When you sell: gain = proceeds minus (average cost × units sold)
• Exception: Same-day rule and the 30-day bed and breakfasting rule

30-Day Rule (Bed & Breakfasting): Sell crypto and buy it back within 30 days? The new purchase price becomes your cost basis for the gain calculation — specifically to stop people from manufacturing artificial losses. This is the UK's version of a wash sale rule.

Income Tax on Crypto

• Mining: If treated as a business → trading income; if hobby → miscellaneous income
• Staking rewards: Miscellaneous income at receipt FMV
• Airdrops with no strings attached: Usually not income; becomes CGT asset at £0 cost
• Airdrops requiring action: Income tax on receipt
• DeFi lending rewards: Income tax

Self Assessment: How to Report Crypto

1. Register for Self Assessment if you have crypto gains/income
2. Deadline: 31 January (online) following the tax year (April 5 year end)
3. Complete the Capital Gains Summary pages (SA108)
4. Report total proceeds, cost, and gains for each type of asset
5. If total gains + income exceed thresholds: consider payments on account

HMRC Compliance and Enforcement

• HMRC has obtained data from UK crypto exchanges and is issuing "nudge letters" to crypto investors
• HMRC participates in international data sharing – foreign exchange data is accessible
• Penalties for non-disclosure: 30% of unpaid tax (unprompted) to 100%+ (deliberate)

UK Crypto Tax Software

CoinTaxReporting supports UK tax reporting:

• Section 104 pooling calculation
• 30-day rule and same-day rule compliance
• Import from Coinbase UK, Binance, Kraken and all major exchanges
• SA108 compatible report

Disclaimer: This article is for general informational purposes only and does not constitute tax advice. For individual tax advice, consult a licensed tax professional.