DeFi Lending Tax Treatment
The beneficial-ownership test for DeFi lending — when depositing tokens is a disposal and when it is not.
DeFi Lending — Tax Treatment
When a user lends crypto via a DeFi protocol (e.g. depositing USDC into Aave's lending pool), the tax treatment depends on a single critical question: does the lender transfer beneficial ownership of the tokens?
This is one of the most complex areas of UK crypto tax, and HMRC has published detailed guidance in the Cryptoassets Manual (CRYPTO61620).
The Beneficial Ownership Test
Examine the protocol's terms and smart contract behaviour:
| If the protocol… | Then… | Result |
|---|---|---|
| Can freely deal with the deposited tokens (re-lend, swap, move) | Beneficial ownership has transferred to the protocol | Disposal — CGT event at time of deposit |
| Is restricted from dealing with the tokens (held in escrow, ring-fenced) | Beneficial ownership remains with the lender | No disposal — no CGT event |
Scenario A: Disposal Occurs (Beneficial Ownership Transfers)
If the protocol can deal freely with your tokens:
- The deposit is a disposal at market value of the tokens at the time of transfer.
- The right to receive tokens back in future is deferred consideration.
- If the quantity to be returned is known: s.48(1) TCGA 1992 applies — value the future tokens at their sterling value when the loan is made.
- If the quantity to be returned is unknown: the right is a "Marren v Ingles right" — an asset for CGT purposes, valued at market value when received.
- Any "interest" or yield received may be subject to Income Tax (and excluded from CGT consideration under s.37 TCGA 1992 to prevent double taxation).
Scenario B: No Disposal (Beneficial Ownership Retained)
If the protocol cannot deal with your tokens:
- No CGT event at deposit or withdrawal.
- Yield/interest received is likely subject to Income Tax as miscellaneous income.
- If the protocol liquidates the position, s.26 TCGA 1992 applies — the protocol is treated as a nominee and gains/losses are attributed to the lender.
Why This Matters
The same action — "depositing tokens into a DeFi protocol" — can have completely different tax consequences depending on the protocol. You must analyse each protocol's smart contract behaviour individually.
HMRC CRYPTO61620 — Making a DeFi loan (Chargeable Gains).
TCGA 1992, s.48(1) — Deferred consideration (ascertainable).
TCGA 1992, s.37 — Exclusion of income from CGT consideration.
TCGA 1992, s.26 — Nominees and bare trustees.
Goodbrand v Loffland Bros North Sea Inc [1998] STC 930 — Deferred consideration in non-sterling assets must be valued at the time the transaction occurs.
Marren v Ingles [1980] STC 500 — A right to receive unascertainable future consideration is itself an asset for CGT purposes.
Explain Like I'm 5
Imagine you lend your favourite toy to a friend. If your friend can play with it, lend it to someone else, and do whatever they want with it, then it is like you gave it away. But if your friend just keeps it safely in a box and cannot touch it, you still own it. The same idea applies when you put your digital coins into a lending app. Whether you still 'own' them decides if you owe tax right away or not.
Key Takeaways
- The critical question for DeFi lending is: does the lender transfer beneficial ownership of the tokens?
- If the protocol can deal freely with deposited tokens → disposal at market value (CGT event).
- If the protocol is restricted from dealing with tokens → no disposal, but yield may still be Income Tax.
- Each protocol must be analysed individually — the same user action can have different tax results.
- Deferred consideration rules (s.48 TCGA / Marren v Ingles) apply to the right to receive tokens back.
Educational only - not financial advice