Do I Need to Report Crypto to HMRC? The Complete Checklist

Do you need to report crypto to HMRC? If you've sold, swapped, staked, or earned any cryptocurrency in the UK, the short answer is almost certainly yes — even if you lost money, even if you never cashed out to fiat, and even if your gains are below the £3,000 annual exempt amount.

But not every crypto transaction is taxable. Buying, holding, bridging, and wrapping are not disposals. The rules depend on what you did — not just whether you made a profit.

This guide is a complete checklist: when you need to report crypto to HMRC, when you don't, what counts as a disposal, the thresholds that trigger a Self Assessment obligation, and what happens if you haven't reported previous years.

The basic rule: disposals trigger reporting

HMRC requires you to report disposals of cryptoassets on your Self Assessment tax return. A disposal happens when you:

• Sell crypto for fiat (GBP, USD, EUR)
• Swap one crypto for another (e.g. ETH → USDC on Uniswap)
• Spend crypto to buy goods, services, or NFTs
• Gift crypto to someone (other than your spouse or civil partner)
• Provide liquidity to a DeFi protocol (you dispose of the deposited tokens)

Every one of these is a disposal for Capital Gains Tax purposes, even if you never touched fiat. The gain or loss is calculated in GBP at the time of the disposal.

What is NOT a disposal

Not every crypto transaction triggers tax. The following are not disposals and do not need to be reported as capital gains:

• Buying crypto with fiat — this is an acquisition, not a disposal
• Transferring between your own wallets — same beneficial owner
• Bridging to another chain — moving ETH from Ethereum to Arbitrum is a transfer, not an exchange
• Wrapping or unwrapping — ETH ↔ WETH is a like-for-like representation change
• Depositing into Aave or lending protocols — you receive a receipt token, but the deposit itself is not a disposal under current HMRC guidance
• Hodling — unrealised gains are not taxable

The £3,000 annual exempt amount

For 2024/25 and 2025/26, the annual exempt amount for Capital Gains Tax is £3,000. This means the first £3,000 of your total capital gains (from all sources — crypto, shares, property) is tax-free.

But you may still need to report even if your gains are below £3,000. HMRC requires you to file a Self Assessment return if:

• Your total disposal proceeds exceed 4 × the annual exempt amount (£12,000 for 2024/25)
• You need to report capital losses (to carry them forward to future years)
• You already file Self Assessment for other reasons (self-employment, rental income, etc.)

DeFi income: staking rewards, yield, and airdrops

Capital gains is only half the picture. If you've earned crypto through staking, yield farming, airdrops, or DeFi rewards, that's income — taxed at your marginal income tax rate (20%, 40%, or 45%), not CGT rates.

Common DeFi income events:

• Staking rewards — ETH staking via Lido, Rocket Pool
• Liquidity pool fees — Uniswap V3 fee income
• Gauge rewards — CRV rewards from Curve Finance
• Yield farming — MasterChef reward harvests
• Airdrops — received tokens valued at FMV on receipt

DeFi income goes on your SA100 (main tax return) in the "Other income" section — not on SA108 (the capital gains pages). If your total income from all sources exceeds the personal allowance (£12,570), you owe income tax on the excess.

Income also enters your cost basis. When you receive staking rewards, the tokens are acquired at their fair market value on the date of receipt. This FMV becomes their cost basis in your Section 104 pool. When you later sell those tokens, you only pay CGT on the gain above that cost basis — you don't get taxed twice. See our detailed guide on DeFi income vs capital gains for the full breakdown.

CARF: HMRC now gets your data directly

Since 1 January 2026, the Crypto-Asset Reporting Framework (CARF) is live in the UK. Around 50 UK-registered exchanges now report your full transaction history directly to HMRC — account balances, buy/sell amounts, withdrawal addresses.

The first data exchange happens in May 2027 (covering 2026 activity), but HMRC has access to exchange data going back several years through existing data-sharing agreements.

What CARF doesn't cover: DeFi. Decentralised exchanges, lending protocols, and liquidity pools don't report to HMRC. If you're active in DeFi, you are responsible for tracking and reporting those transactions yourself.

What if I haven't reported previous years?

If you have unreported crypto disposals from previous tax years, HMRC's position is clear: you should make a voluntary disclosure as soon as possible. Penalties are significantly lower for voluntary disclosures than for cases where HMRC discovers the omission themselves.

HMRC can go back up to 20 years for deliberate non-disclosure. For innocent errors, the normal window is 4 years. For careless errors, 6 years.

The practical steps:

1. Get your full transaction history classified. You need accurate records across all chains and tax years before you can calculate what's owed.
2. Calculate gains, losses, and income per tax year. Apply HMRC's matching rules (same-day, 30-day B&B, Section 104 pooling) correctly for each year.
3. File amended returns or voluntary disclosures. Consider speaking with a tax adviser who understands crypto — the complexity of DeFi transactions means generic accountants often miss things.

Quick reference: do I need to report?

SA108 2024/25: the new crypto boxes

From the 2024/25 tax year, HMRC's SA108 (Capital Gains) form includes dedicated crypto boxes (13.1 to 13.8). You no longer report crypto gains in the generic "other assets" section — there are specific fields for:

• Box 13.1: Number of crypto disposals
• Box 13.2: Total disposal proceeds
• Box 13.3: Total allowable costs
• Box 13.4: Total gains
• Box 13.5: Total losses
• Box 13.6: Net gains or losses

ChainTax generates these SA108 figures automatically from your classified transactions — including the Box 51 split-year adjustment for the 2024/25 CGT rate change (18%/24% from 30 October 2024).