DeFi Income vs Capital Gains — How HMRC Taxes Staking, Swaps, and Yield

DeFi income and capital gains are taxed at different rates in the UK — and most crypto tax tools don't distinguish between them. Staking rewards from Lido are income. Swapping ETH for USDC on Uniswap is a capital gain. Depositing into Aave is neither. Getting the classification wrong means paying the wrong rate on every single event.

Capital gains are taxed at 18% or 24%. Income is taxed at 20%, 40%, or 45%. They go on different tax forms, have different allowances, and are calculated independently. The difference can double your tax bill — or halve it.

This guide explains exactly when DeFi activity is income, when it's a capital gain, when it's a non-taxable transfer — and why the classification matters more than most people realise.

The fundamental distinction

HMRC applies a simple test: is this a return on an investment (capital), or compensation for an activity (income)?

This matters because the two tax types go on different forms, have different allowances, and are calculated independently. You can't offset capital losses against income, and you can't use the £3,000 CGT annual exempt amount against income.

What counts as income in DeFi

DeFi income is tokens you receive without disposing of an existing asset. You didn't swap, sell, or exchange anything — tokens simply arrived in your wallet as compensation for an activity.

Staking rewards

When you stake ETH through Lido and receive stETH rebases, or deposit into a Curve gauge and claim CRV rewards, those new tokens are income. You are being compensated for securing the network or providing liquidity — the tokens are earned, not traded for.

HMRC's position (CRYPTO21200): staking rewards are miscellaneous income, taxed at your marginal rate, at fair market value on the date of receipt.

Liquidity pool fee income

Uniswap V3 concentrated liquidity positions earn trading fees continuously. When you collect these fees, the received tokens are income — not a capital gain. You haven't disposed of your LP position; you've collected earnings from it.

Yield farming rewards

Harvesting reward tokens from MasterChef contracts, claiming MAGIC from Atlas Mine staking, or collecting protocol incentives — all income. The reward tokens are acquired at FMV on the harvest date.

What counts as a capital gain

A capital gain arises when you dispose of a cryptoasset — sell it, swap it, spend it, or provide it as liquidity. The gain is the difference between disposal proceeds and your cost basis (from the Section 104 pool, after same-day and 30-day B&B matching).

Token swaps

Swapping ETH for USDC on Uniswap is a disposal of ETH. The USDC you receive is an acquisition. If the market value of the ETH at the time of swap exceeds your cost basis, you have a capital gain.

Selling for fiat

The straightforward case — selling crypto on an exchange for GBP. Proceeds minus cost basis equals your gain.

LP removal

When you remove liquidity from a pool and receive tokens back, you are disposing of the LP token. The tokens you receive are the disposal proceeds. The LP token exits your S104 pool, and the gain or loss is calculated against its cost basis.

NFT purchases

Buying an NFT with ETH is a disposal of the ETH. The NFT is the acquisition. If the ETH has appreciated since you acquired it, you have a capital gain — even though you "just bought something."

What is neither: non-taxable transfers

Some DeFi operations are not taxable events at all. These are movements of assets that don't change beneficial ownership or exchange one asset for another:

• Bridging — moving tokens cross-chain (Hop, Arbitrum, Optimism, Base, Polygon)
• Wrapping/unwrapping — ETH ↔ WETH, stETH → wstETH
• Aave deposits/withdrawals — lending protocol receipt tokens
• Wallet-to-wallet transfers — between addresses you own

These are classified as TRANSFER — cost basis carries over, no gain or loss is recognised.

The grey areas

Some DeFi transactions don't fit neatly into income or capital gains. HMRC guidance is evolving, and reasonable positions exist on both sides:

Liquid staking (ETH → stETH, rETH)

When you stake ETH with Lido and receive stETH, is this a swap (capital gain) or a staking deposit (transfer)? HMRC hasn't issued definitive guidance on liquid staking tokens specifically.

The conservative position — which ChainTax takes — is that acquiring stETH or rETH is a token swap (disposal of ETH, acquisition of stETH/rETH) because the received token has different economic characteristics. Subsequent stETH rebases are then income.

LP deposits (Uniswap, Curve, Balancer)

Adding liquidity to a pool involves depositing tokens and receiving an LP token. ChainTax classifies this as a cost basis change — the deposited tokens exit your S104 pool, and the LP token enters at the combined value. This is not a taxable event in itself, but it restructures your cost basis for when you later remove liquidity.

Airdrops

Airdrops are generally income at FMV on receipt. But if you received tokens with no market value (e.g. a governance token airdrop before trading began), the income value could reasonably be zero — with the full amount becoming a capital gain when you later sell.

Protocol-by-protocol classification

Here is how ChainTax classifies the most common DeFi protocols, based on HMRC guidance and conservative tax treatment:

Why most tax tools get classification wrong

The root problem is that most crypto tax tools work from token movements, not transaction intent. They see tokens leave and tokens arrive. They don't understand why.

This means:

• CRV rewards look like "tokens received from a contract" — classified as a capital gain instead of income. Wrong tax form, wrong rate.
• Aave deposits look like "tokens sent to a contract, new tokens received" — classified as a swap. Creates a phantom disposal.
• LP fee collection gets merged with LP removal — income and capital gains lumped together as a single event.
• Bridge transfers look like "tokens sent to an external address" — classified as a disposal with a phantom gain.

ChainTax reads the contract address, method signature, and decoded event logs of every transaction. It knows that Minter.mint() on Curve is a reward claim, not a token purchase. It knows that Pool.supply() on Aave is a deposit, not a swap. Classification at the contract level is the only way to get the tax treatment right.

The compounding cost of misclassification

One misclassified event doesn't just create one wrong tax figure — it cascades:

1. Wrong cost basis enters the S104 pool. If an Aave deposit is treated as a disposal, the withdrawn tokens get a fresh cost basis at withdrawal value instead of carrying over the original cost basis.
2. Every subsequent disposal of that token uses the wrong pool average. Your gains or losses are wrong on every trade from that point forward.
3. Income reported as capital gains (or vice versa) goes on the wrong tax form. HMRC can challenge returns where income appears on SA108 instead of SA100.
4. Loss carry-forward is miscalculated. Phantom losses from misclassified transfers inflate your carried-forward losses, which then incorrectly offset real gains in future years.