This Practice Note considers what liquidated damages clauses are and briefly when and how they are used. It then focuses, in particular, on the court’s approach when determining whether a purported liquidated damages clause is, in fact, a penalty and therefore unenforceable; tracing the authorities through to how the question should be approached in light of the 2015 Supreme Court Makdessi/ParkingEye decision and considering, in particular, issues such as when contractual provisions for accelerated receipt, default interest, or positive incentives may be considered as a penalty. Consideration is also given to whether liquidated damages survive termination and their relationship with partial performance. What is a liquidated damages clause? A liquidated damages clause is a clause whereby the parties to a contract fix in advance a sum of money to be paid by the defaulting party to the innocent party in the event of a breach. The sum payable represents agreed damages (called liquidated damages) and is recoverable without the innocent party needing to prove the actual loss suffered. Liquidated damages clauses