It seems the contract demands a repayment of €21,000 regardless of when repayment takes place, the only question being whether early repayment would constitute a breach of contract (in my view unlikely to be upheld in a court). Presumably no decision has yet been entered into over the the issue of the €1000 so it is perhaps time to raise it tactfully: What is the borrower's view. The moral dilemma versus financial business transactions is there: Just because, in the fullness of time, the lender expected a gain, what does he lose if he gets his capital back early without the full gain being realised ? He has the capital back and can again put it to whatever use he sees fit. Is insisting on more than the proportionate gain (actual versus contract) reasonable/wise, whether in terms of the original "interest" or a "fee/charge" to replace it ?