Crypto Tax CARF Calculator Trending

The Crypto Asset Reporting Framework (CARF) is a new international reporting standard developed by the OECD and adopted by the UK. From 2026, UK crypto asset service providers must collect and report information about their users' transactions to HMRC, who will exchange this data with other tax authorities.

Under CARF, reportable transactions include exchanges of crypto for fiat currency, crypto-to-crypto swaps and transfers of crypto assets. The framework requires reporting the total gross proceeds, number of transactions and the type of crypto asset for each user. This is separate from your personal obligation to declare gains on your tax return.

This calculator estimates your reporting exposure under CARF based on your transaction history. It summarises which of your trades are reportable, the total gross value that will be reported to HMRC and whether your activity triggers additional due-diligence requirements.

UK Crypto-Asset Reporting Framework (CARF) 2026. Global standard for automatic exchange of crypto tax data. UK implementation from 1 January 2026 (mandatory reporting by crypto exchanges). All UK crypto users tracked — HMRC receives data from: Coinbase UK, Binance UK, Kraken, Crypto.com, Revolut, eToro, etc. Foreign exchanges with UK customers: also reporting (similar to CRS for bank accounts). Penalties: up to £30,000 + criminal prosecution for undeclared crypto gains.

What CARF reports include. Identity: name, address, NI number/tax residence. Transaction-level: each crypto buy, sell, swap, transfer. Capital gains: realised gains and losses. Income: staking rewards, mining income, airdrops. Stablecoin trades: counted as disposals (even USDC-to-USDT). NFT purchases and sales. DeFi yield. Wrapped tokens (WBTC, etc.) — wrap/unwrap = disposal. HMRC cross-references against Self Assessment — discrepancies trigger investigations.

Capital Gains Tax on crypto 2026/27. 18% basic rate; 24% higher rate (residential property rate applied to crypto from April 2024). Annual Exempt Amount £3,000 (cut from £12,300 in 2022). Sample: £20,000 crypto gain, higher-rate taxpayer = £20k − £3k AEA = £17k taxable × 24% = £4,080 tax. Pooling rules apply (Section 104 pool) — average cost basis across all purchases of same asset. 30-day rule prevents bed-and-breakfasting (sell + repurchase within 30 days uses original cost).

Income tax on crypto activities. Mining income: trading profit (20-45% income tax + Class 4 NI 6-2%) OR misc income depending on scale. Staking rewards: misc income taxed at marginal rate (sample £5k staking at 40% = £2k tax). Airdrops: income at receipt value, plus future CGT on sale. NFT royalties: trading or misc income. Crypto salary: PAYE at value-on-receipt. Lending/borrowing protocols (Aave, Compound): interest = misc income.

How to comply with UK crypto tax 2026. Track every transaction since you started: use Koinly, CoinTracking, or Recap (UK-specialised) — £50-£250/year. Calculate CGT and income separately. File via Self Assessment (deadline 31 January). Pay any tax owed. Declare crypto in capital gains pages OR misc income pages. Holding only (no sales): no tax. Lost private key (genuinely lost crypto): claim as 'negligible value' — capital loss offset against future gains. Don't try to hide: CARF + DAC8 will catch you.