Unjust enrichment

Under Turkish law, unjust enrichment arises when a person benefits from another's assets or labour without a valid legal ground. The enriched party must return what was obtained; the doctrine corrects transfers that turn out to lack legal justification.

The most frequent scenario is payment of what was not owed: money wired to the wrong account, an invoice paid twice, or sums paid under a contract that proves invalid can all be reclaimed on this basis, including the price paid under a void real estate sale.

The claim is subsidiary: where a valid contract exists between the parties, contractual rules apply first. It is subject to statutory limitation periods, and a person who paid knowing that nothing was owed generally cannot demand restitution.