UK Crypto Tax Calculator

UK Crypto Tax Reporting: What HMRC Expects

HMRC does not treat cryptoassets as money or currency. For tax purposes they are chargeable assets, which means every sale, swap, or spend is a disposal that may give rise to a Capital Gains Tax charge. Staking rewards may be taxable as miscellaneous income if the activity does not amount to a trade. Airdrop treatment is fact-sensitive - whether Income Tax applies at receipt depends on the circumstances under which the tokens were received. Getting this right requires the correct matching rules and accurate record-keeping for your Self Assessment return.

Section 104 pooling, not FIFO

Unlike most countries, the UK does not use FIFO (First In, First Out) for crypto tax. HMRC requires a three-step matching process for each disposal:

• Same-day rule: If you buy and sell the same token on the same day, those transactions are matched first. This prevents you from selling and immediately rebuying to crystallise a loss while keeping the same position.
• Bed & breakfast rule (30-day): If you sell a token and repurchase the same token within 30 days, the sale is matched against the repurchase price rather than the pool. This is HMRC's anti-avoidance measure under section 106A TCGA 1992.
• Section 104 pool: Any unmatched disposals are matched against the weighted average cost of all your remaining holdings in that token. The pool updates every time you acquire or dispose of tokens.

Our Section 104 engine applies these matching steps to the history provided. Compare the method with HMRC’s worked examples; missing history and unresolved transactions require review.

Capital Gains Tax rates

Reference: HMRC Capital Gains Tax rates.

For 2024/25, main crypto CGT rates are 10%/20% on disposals before 30 October 2024 and 18%/24% from 30 October. For 2025/26 they are 18%/24% throughout. The Annual Exempt Amount is £3,000 for both years. Ordinary taxable income uses the income-tax bands first; chargeable gains then use only the remaining basic-rate band. Capital losses can be carried forward once validly claimed.

Reporting thresholds and deadlines

Reference: HMRC Self Assessment deadlines and the year-specific SA108 notes linked below.

For 2024/25 and 2025/26, complete the capital gains pages if total chargeable gains before losses are more than the £3,000 Annual Exempt Amount. If you are already required to send a return, the pages are also required when total disposal proceeds exceed £50,000. Other filing obligations can still apply, including when HMRC has asked you to complete a return.

The UK tax year runs from 6 April to 5 April. For the 2025-26 tax year (6 April 2025 to 5 April 2026): notify HMRC by 5 October 2026 if you are not already in Self Assessment; file a paper return by 31 October 2026; file and pay online by 31 January 2027.

What goes on your Self Assessment

Capital gains from crypto disposals are reported on the year-specific SA108 Cryptoassets section. The 2023/24 form uses boxes 14, 15, 16, 17, 19, 20, 21 and 22. The 2024/25 and 2025/26 forms use boxes 13.1–13.8; 2024/25 may additionally require the separately computed box 51 adjustment. Staking and mining income that does not amount to a trade, and airdrops where Income Tax applies at receipt, go on your SA100. Airdrop treatment is fact-sensitive - consult a tax adviser if you are unsure whether a particular airdrop is taxable at receipt. The Adviser Records Pack gives your accountant transaction, pool, and review records; it does not calculate tax or claim to fill SA108.

FX conversion to GBP

Most exchanges report values in USD. We convert all transaction values to GBP using historical daily rates. HMRC requires sterling values throughout but does not mandate a specific exchange rate source; we use European Central Bank published rates as a consistent, auditable reference. The conversion happens before the matching engine runs, so your Section 104 pool is calculated entirely in pounds. On-chain wallet data is fetched directly in GBP where available.

NFTs and individual cost basis

Under HMRC guidance, NFTs should not be pooled under Section 104 because each NFT is unique. We track each NFT individually (e.g. CryptoPunk #12345 gets its own cost basis) rather than pooling all NFTs of the same collection together.

What's in the report

The UK Adviser Records PDF contains transaction records, holdings, Section 104 pool records, matching details, and review items for your accountant or tax adviser. It includes no tax amount, SA108 box claim, or submission-ready representation.

Bitcoin wallet support

Hold BTC in a hardware wallet? Add your Bitcoin addresses (P2PKH, P2SH, Bech32, or Taproot) and we'll scan your full transaction history and merge it with your exchange data. Up to 3 BTC addresses per report. All BTC values are converted to GBP using historical rates.

UK guides by cryptoasset

For asset-specific examples and supported inputs, explore our Bitcoin tax calculator for the UK, Ethereum tax calculator for the UK, and Solana tax calculator for the UK.

Supported exchanges

Upload your CSV from Coinbase (35+ transaction types), Binance (75+ operations), or Kraken (ledger format with refid pairing). All three calculators automatically apply Section 104 pooling when you select the UK. If your records came from an app-based exchange or fintech platform instead, see our Revolut, Crypto.com, Bitstamp, or OKX pages too.

Cryptoasset Reporting Framework (CARF)

The UK's Cryptoasset Reporting Framework regulations came into force on 1 January 2026. UK cryptoasset service providers must now collect customer tax-residence and transaction data. The first reporting window runs from 1 January 2027 to 31 May 2027, covering the calendar year 1 January 2026 to 31 December 2026. Under these rules, HMRC may receive reportable user and transaction data from in-scope UK providers. Your own Self Assessment obligation is unchanged by this.

Supported countries

We also generate country-specific reports for the US, Canada, Australia, New Zealand, India, and South Africa. Each report applies the correct matching rules, tax rates, and filing rules for that country.

UK crypto tax deadline

The online filing and payment deadline for the 2025-26 tax year is 31 January 2027. See UK crypto tax deadline for key dates, penalty details, and what you need to file.