DeFi Tax UK 2026: liquidity pools, lending and HMRC's view

DeFi creates the hardest reporting questions in UK crypto tax. HMRC published initial DeFi guidance in February 2022 and ran a fresh consultation in 2024 proposing a no-disposal framework for lending and staking. Until that consultation is enacted, the 2022 position applies and most DeFi events are CGT disposals at 18% or 24% above the £3,000 Annual Exempt Amount.

How does HMRC tax DeFi in 2026?

The beneficial ownership test

HMRC's framework hinges on a single question: does beneficial ownership of the token change when you interact with the smart contract? If yes, you have disposed of one asset and acquired another. If no, the position is preserved and there is no CGT event, although any new tokens received as rewards are still taxable income.

The test sounds simple but the application is messy. Smart contracts vary, and the legal characterisation of a transfer can depend on the protocol's mechanics rather than how the UI presents the action. Where the protocol custodies your tokens and you receive a receipt-style token in exchange, HMRC's working view in 2022 was that this is a disposal.

Liquidity provision and LP tokens

Depositing tokens into a Uniswap v2 pool is the textbook example. You hand over ETH and a stablecoin, the contract gives you back an LP token representing your share. Under HMRC's 2022 view this is two disposals at once: ETH disposed for the LP token, USDC disposed for the LP token. The LP token's cost basis equals the GBP value of both assets supplied.

Withdrawing later is a disposal of the LP token. Proceeds equal the GBP value of the assets you receive. Any difference between the LP token's cost basis and proceeds is a gain or loss, and it absorbs whatever impermanent loss has occurred. Concentrated liquidity positions on Uniswap v3 work the same way conceptually but the maths gets fiddly because positions are NFTs with custom price ranges.

Lending on Aave and Compound

Depositing USDC into Aave and receiving aUSDC is, in HMRC's 2022 view, a disposal of USDC and acquisition of aUSDC. The aUSDC token has a cost basis equal to the GBP value of the USDC at deposit. Because aUSDC's value drifts up as interest accrues, your cost basis stays flat and the interest manifests as gain on disposal.

Compound's cToken model is identical. Where the protocol pays a separate reward token (for example COMP), that reward is miscellaneous income at the GBP value when it accrues to your wallet, and a separate CGT event when you later sell it.

Wrapping, bridging and same-asset swaps

Wrapping ETH into WETH is the awkward case. The 2022 guidance treated it as a disposal, which most practitioners felt was harsh. The 2024 consultation pivoted: where the wrapped asset is economically identical and beneficial ownership is preserved, it should not be a disposal. Until that change is law, two defensible approaches exist.

• Conservative. Treat WETH and ETH as separate Section 104 pools and report each wrap or unwrap as a disposal. Higher reporting burden, lower HMRC enquiry risk.
• Pragmatic. Treat WETH and ETH as the same asset for share-pooling purposes, document your reasoning, and rely on the 2024 consultation direction. Note this on your Self Assessment in the white space.

Bridging tokens cross-chain follows similar logic. Where the bridged token is a wrapper secured 1:1 by the original, treat with care. Where the bridge mints a new asset under different security assumptions, the 2022 disposal view is harder to argue against.

Yield farming and reward tokens

Reward tokens emitted by farms are miscellaneous income at the GBP value on the date of receipt. The receipt date is when the tokens become controllable in your wallet, which for most automated farms is when you click claim or when the contract auto-streams to your address. Vesting and locked rewards are slightly different: HMRC's view in CRYPTO22300 is that income arises when the tokens become unconditionally yours.

After receipt, the income figure becomes the cost basis for CGT purposes. Sell the token later, and you compute capital gain or loss against that figure. The income tax already paid is not refundable if the token's value falls before you sell, but the loss reduces the CGT bill on disposal.

Borrowing, liquidations and impermanent loss

Taking a loan from Aave against ETH collateral is not a disposal. The collateral is locked but you retain beneficial ownership. Repaying the loan in the same currency is not a disposal either. If you repay in a different currency, that repayment is a disposal of the repayment asset at GBP market value.

Liquidations are forced disposals. The protocol sells your collateral at the liquidation price and uses proceeds to repay the loan. You compute gain or loss on the collateral disposal in the normal way. Where proceeds fall short of the loan, the shortfall is not a further loss; it simply means the collateral disposal value equals the seized amount.

Impermanent loss is not a separate tax concept in the UK. It only crystallises when you withdraw from the pool. At that point, the LP token disposal calculation absorbs the impermanent loss automatically, since proceeds reflect the new token mix and the cost basis reflects the original mix.

Worked example: Uniswap v2 ETH/USDC pool

On 1 June 2025 Aisha deposits 1 ETH (acquisition cost £1,500) and 3,000 USDC (acquisition cost £2,400) into a Uniswap v2 ETH/USDC pool. She receives an LP token in exchange.

Total gains for Aisha across the year from this pool are £660 (£300 + £0 + £360). Within the £3,000 Annual Exempt Amount this is tax free, but it must be reported if her total proceeds exceed the reporting threshold or if she is otherwise in Self Assessment.

Record keeping for DeFi

DeFi makes record keeping harder than CEX trading because there is no end-of-year statement. Every wallet you touch, every chain you bridge to, and every protocol you interact with is its own data silo. HMRC expects you to be able to produce, on request, the GBP value at the timestamp of every disposal and every reward receipt across that entire footprint.

The minimum viable record set for each transaction is: timestamp (UTC), wallet address, protocol or contract address, transaction hash, asset in, asset out, amount in, amount out, and the GBP spot value of each side at the timestamp. A reliable price oracle source matters: HMRC accepts CoinGecko, CoinMarketCap and exchange-derived rates as long as you are consistent year on year. Switching mid-year is a red flag.

Gas fees in ETH are a deductible cost on the relevant disposal. Where one transaction causes multiple disposals (a single batch that swaps and deposits in one call), the gas fee can be split proportionally. Failed transactions where ETH was burned without economic benefit are not deductible against gains, although they may be relievable as an income expense in the rare case where you are taxed as a trader.

Multi-protocol strategies

Real DeFi positions rarely live in one place. A typical yield strategy might use Lido for liquid staking, deposit the resulting stETH into Aave as collateral, borrow USDC, and provide that USDC to a Curve pool. Each of those steps is potentially its own taxable event under the 2022 framework.

Untangling them on a return means walking each leg in order, recording the disposal or income event at each step, and confirming that the cost basis of every new token created in your wallet ties back to the GBP value at acquisition. Crypto tax software can do this if connected to every wallet and every chain you used; manual reconciliation usually misses something.

Airdrops and forks in DeFi

Many DeFi protocols launch by airdropping governance tokens to early users. HMRC's view in CRYPTO21250 is that an airdrop received in return for past activity (using the protocol, bridging volume, providing liquidity) is miscellaneous income at receipt. An airdrop with no quid pro quo (a free distribution to all wallets meeting some criterion) may not be income, but the cost basis is zero, so any later disposal is a full-proceeds gain.

Hard forks are rarer in 2026 but follow a similar logic. The new chain's tokens inherit a share of the original cost basis based on relative market value at the fork. Where the new chain has no value at the moment of the fork, basis stays with the original chain.

Reporting on Self Assessment

DeFi disposals go on SA108 like any other CGT disposal. Aggregated proceeds, allowable costs, and gains are all that the form needs, plus the number of disposals and a brief description (cryptoassets is sufficient). Income from yield farming, lending interest in token form, and airdrops sits on the additional information pages with other miscellaneous income.

Use the white space to flag any pragmatic positions: the wrapping treatment you adopted, the cost basis method you applied to LP tokens, the basis on which you treated a borderline protocol as non-disposal. White-space disclosure does not bind HMRC but it materially reduces your exposure to discovery assessments and behavioural penalties later.

Summary

UK DeFi tax in 2026 still leans on the 2022 framework. Treat liquidity provision and most protocol deposits as disposals, treat reward tokens as miscellaneous income at receipt, and keep careful records of every wrap, bridge and farm interaction. The 2024 consultation may soften the position for lending and staking from a future tax year, but until it is enacted, file conservatively and document any pragmatic positions in the Self Assessment white space. The combination of the £3,000 Annual Exempt Amount and the Crypto-Asset Reporting Framework data flow that started in 2026 means even small DeFi positions are worth getting right.

For the broader UK framework see our UK Crypto Tax 2026 guide and for the staking-specific rules see UK staking tax. If you took losses on any DeFi position, follow how to claim crypto losses with HMRC. HMRC's manual is at gov.uk Cryptoassets Manual.