UK Crypto Tax Practical Guide 2026/27: HMRC CARF Reporting

HMRC CARF reporting from January 2026

The Crypto-Asset Reporting Framework (CARF) is the international standard the UK adopted in Finance Act 2024. From January 2026:

• UK-licensed crypto exchanges + custodians (Coinbase UK, Binance UK, Kraken, Bitstamp, etc.) must report customer transactions to HMRC annually
• Coverage: customer identification, transactions over £1,500 equivalent, gains/losses, fiat on/off ramps
• HMRC will cross-match this data against your Self Assessment returns
• Mirrors existing bank reporting under FATCA + CRS

Implication: undeclared crypto activity will be discovered. Voluntary disclosure before HMRC contact reduces penalties dramatically.

What\'s a taxable event in UK crypto?

CGT events (capital gains)

• Selling crypto for fiat (GBP, USD, EUR)
• Swapping one crypto for another (BTC → ETH = disposal of BTC at market value)
• Buying goods/services with crypto
• Gifting to non-spouse (deemed disposal at market value)

Income Tax events

• Mining rewards (at GBP value when received)
• Staking rewards (at GBP value when received)
• Airdrop receipts (in some cases - depends on whether received for action)
• Yield farming + DeFi lending interest (at GBP value when accrued)
• Crypto paid as salary (full PAYE applies)

Not taxable

• Buying crypto with fiat + holding
• Moving crypto between your own wallets
• Hard forks where you receive both coin variants (subject to specific HMRC guidance)
• Gifting to spouse

CGT calculation for 2026/27

Rates: 18% basic-rate band, 24% higher-rate band. £3,000 AEA per person per year.

Share matching rules (in order):

1. Same-day rule: Match disposals against acquisitions made the same day
2. 30-day rule (B&B): Match against acquisitions in the 30 days FOLLOWING disposal (prevents loss harvesting via immediate repurchase)
3. Section 104 pool: All other holdings averaged - calculate weighted-average cost basis

Worked example: bought 1 BTC at £20,000 in 2022, sold for £40,000 in 2026:

• Disposal proceeds: £40,000
• Acquisition cost: £20,000
• Gain: £20,000
• Less AEA: £17,000
• Higher-rate CGT 24%: £4,080

Record-keeping requirements

For every transaction, keep:

• Date + time (UTC)
• Transaction type (buy/sell/swap/transfer/income event)
• Counterparty (exchange name, wallet address)
• GBP market value at transaction time
• Transaction fees
• Wallet addresses involved

HMRC requires records kept 5 years from filing deadline.

Recommended crypto tax software

Voluntary disclosure for past undeclared activity

If you had crypto activity in earlier years without declaring:

1. Use HMRC\'s Worldwide Disclosure Facility (online at gov.uk) or letter to HMRC Cryptoassets team
2. Calculate tax due for each year (use crypto tax software for accurate computation)
3. Submit disclosure with proposed payment plan
4. Penalties reduce from 30-100% (HMRC-prompted) to 10-20% (voluntary disclosure)
5. Interest still applies from original due date

Before disclosure for substantial undeclared amounts (£10,000+ tax), engage a crypto-specialist accountant.

Related pages

• Crypto CGT Calculator
• UK Crypto Tax Calculator
• Crypto Tax UK Guide
• Cryptocurrency Tax Deep Dive
• CGT Calculator

Frequently asked questions

1. Do I need to declare crypto to HMRC in 2026?

   Yes if you have disposals (sold for fiat, swapped between coins, used to buy goods, gifted to non-spouse), staking/mining income, or airdrops. HMRC CARF (Crypto-Asset Reporting Framework) effective January 2026 means UK exchanges (Coinbase, Binance UK, Kraken, etc.) automatically report your transactions to HMRC. Undeclared crypto activity will be matched against exchange data.

2. What is HMRC CARF reporting?

   Crypto-Asset Reporting Framework - international standard adopted by UK in Finance Act 2024. From January 2026, UK-licensed crypto exchanges + custodians must report customer transactions to HMRC annually. Covers: identification of customer, transactions over £1,500 equivalent, gains/losses, fiat on/off ramps. Mirrors existing bank reporting (FATCA/CRS).

3. How are crypto disposals taxed?

   CGT applies. 2026/27 rates: 18% basic-rate band, 24% higher-rate band. £3,000 AEA per person. Disposal events: selling for fiat, swapping crypto-for-crypto (each swap a separate disposal), buying goods/services with crypto, gifting (except to spouse). HMRC treats each disposal independently using share matching rules: same-day, then 30-day (B&B rule), then Section 104 pooled cost.

4. How is staking and mining income taxed?

   Income Tax at marginal rate on the GBP market value at receipt. Treated as miscellaneous income (or trading income if mining is at commercial scale). Plus subsequent CGT on disposal of the staked/mined coins, with base cost = the market value at receipt (already taxed as income). Double-taxation avoided through proper base cost tracking.

5. What records do I need to keep?

   For every transaction: date, type (buy/sell/swap/transfer/airdrop), counterparty, GBP market value at transaction time, transaction fees, wallet addresses. HMRC requires records kept 5 years from filing deadline. Practical software: Koinly, Recap, CryptoTaxCalculator, Accointing - aggregate from exchanges + wallets, output CGT report compatible with Self Assessment.

6. What if I held crypto on a now-bankrupt exchange?

   Capital loss can be claimed if asset is "of negligible value" - submit negligible value claim via Self Assessment. The loss reduces other capital gains. Examples: FTX, Celsius, Voyager creditors. Important: claim must specify the year. Speak to a crypto-specialist accountant for complex creditor situations.

7. Is moving crypto between my own wallets taxable?

   No - moving between wallets you control is not a disposal. Buying USDC with GBP, then sending USDC to your own DeFi wallet, is not taxable. Only swapping USDC for ETH (or any other token) is a disposal. Keep records of wallet-to-wallet transfers to demonstrate ownership.

8. What about DeFi - liquidity pools, yield farming, lending?

   HMRC guidance evolving. Current position: providing liquidity = disposal (you swap tokens for LP token). Yield from staking/farming = income at receipt. Removing liquidity = disposal of LP token. Borrowing not taxable; repayment with appreciated collateral is disposal. DeFi tax tracking is genuinely complex - use specialist crypto tax software + qualified accountant for material positions.

9. Can I gift crypto tax-free?

   To spouse: yes, tax-free transfer at base cost (no CGT). To anyone else: deemed disposal at market value (you pay CGT on the gain). Charitable gifts: no CGT due, plus Income Tax relief if Gift Aid applies. Inheritance: forms part of estate at probate value (CGT base cost resets to date-of-death value).

10. What if I had crypto activity in earlier years but didn't declare?

    Voluntary disclosure significantly reduces penalties. Use HMRC's Let Property Campaign-equivalent for crypto (no specific campaign, but disclosure under standard Worldwide Disclosure Facility or by letter to HMRC). Penalties reduce from 30%+ to 10-20% with full voluntary disclosure. Interest still accrues from due date. Get advice before disclosure for complex cases.