Question 1

Do I have to pay tax on my crypto in the UK?

Accepted Answer

Yes. HMRC treats crypto-assets as property for Capital Gains Tax. Every disposal — sale, swap, gift, or spending crypto on goods — is a taxable event. Gains above the annual exempt amount (£3,000 for 2024/25 onwards) are taxed at 18% (basic rate) or 24% (higher/additional rate) for disposals on or after 30 October 2024.

Question 2

What is Section 104 pooling for crypto?

Accepted Answer

HMRC requires you to pool all units of the same crypto-asset together and use the average cost as your cost basis. The pool grows when you buy more and shrinks when you sell. Same-day and 30-day acquisitions are matched first; everything else falls into the Section 104 pool.

Question 3

How does CryptoLens calculate my UK crypto tax?

Accepted Answer

Paste your wallet address. We pull every on-chain transaction, price each one in GBP at the time of the trade using a CoinGecko/DefiLlama/Birdeye/DexScreener fallback chain, and run the HMRC matching rules in order — same-day, then 30-day, then Section 104. Output is your gross gain or loss, the AEA used, and the taxable amount at both basic and higher rates.

Question 4

Is the calculator free?

Accepted Answer

The headline number is free. PDF/CSV export, multi-wallet aggregation, the SA108 schedule, and the per-disposal audit trail are paid features (Pro from £4.99/month).

UK Crypto Tax Calculator