CryptoLens

UK Crypto Tax Calculator

Calculate your HMRC capital gains tax on crypto automatically. Section 104 pool, same-day rule and the 30-day bed-and-breakfast rule all handled for you — across Ethereum, Solana and BSC wallets.

Scan your wallet free See pricing
  • HMRC-compliant Section 104 share pooling
  • Same-day and 30-day bed-and-breakfast rules
  • £3,000 annual allowance applied automatically
  • CGT export ready for your Self Assessment
  • ETH, BSC and Solana wallets supported
  • No CSV uploads — we pull on-chain data directly

How UK crypto tax works

HMRC treats crypto as an asset for capital gains tax purposes. When you sell, swap, gift or spend crypto, you trigger a disposal and may owe CGT on the gain. The rules are fiddly: you pool all units of the same token (Section 104), but sales are matched first against purchases on the same day, then against purchases in the 30 days after the sale (the bed-and-breakfast rule), and finally against the pool. For 2024/25 the annual allowance is £3,000, and gains above that are taxed at 10% or 20% depending on your income band. CryptoLens applies all of these rules automatically when you scan your wallet. We match disposals in the correct order, track your pool cost basis, and produce a report you can paste straight into your Self Assessment SA108. No spreadsheets, no CSV wrangling.

Frequently asked questions

Is CryptoLens really free?▾

Yes — scanning any wallet, seeing your portfolio, and viewing the core tax summary are free forever. The Pro plan (£19.99/mo) adds the full CGT report export, unlimited wallets, transaction history, and price alerts.

What's the Section 104 pool?▾

Section 104 is HMRC's rule for matching crypto disposals to acquisitions. Instead of FIFO or LIFO, you keep a running 'pool' of all units of each token with an averaged cost basis. When you sell, the cost comes from the pool.

Do I pay tax if I only hold crypto?▾

No. Holding crypto — whether on an exchange or in your own wallet — is not a taxable event. You only trigger capital gains when you dispose of it: selling, swapping for another token, gifting (except to a spouse), or spending.

What about staking and airdrops?▾

Staking rewards and airdrops are usually income tax, not CGT. You'd report them as miscellaneous income at the GBP value on the day you received them. CryptoLens can help you estimate that value; we do not yet file income tax returns.

Can I use this for my Self Assessment?▾

Yes. The Pro plan produces a CGT summary in the exact format HMRC wants for SA108: total disposals, total gains, total losses, and the net gain. You can also export a full transaction list in case HMRC asks for records.

Do I need to connect my exchange?▾

No. CryptoLens reads public on-chain data from your wallet addresses only. For exchange-held crypto, you can export a CSV from the exchange and upload — or move to a self-custody wallet for automatic tracking.

Ready to get started?

Free forever plan. No credit card. Cancel Pro any time.

Scan your wallet free