CRYPTO61413 | Decentralised Finance: Lending and staking: Corporation Tax: Making a DeFi loan: Amount Chargeable to Corporation Tax
From HM Revenue & Customs · Cryptoassets Manual
The miscellaneous income sweep-up provisions will only subject the return (see CRYPTO61130) received by the lender/liquidity provider and not the repayment of the principal to Corporation Tax. The repayment of the principal will be a capital transaction (see CRYPTO61620).