Liquidated damages
Liquidated damages (also referred to as liquidated and ascertained damages) are damages whose amount the parties designate during the formation of a contract for the injured party to collect as compensation upon a specific breach (e.g., late performance).
When damages are not predetermined/assessed in advance, then the amount recoverable is said to be 'at large' (to be agreed or determined by a court or tribunal in the event of breach).
Common law
At common law, a liquidated damages clause will not be enforced if its purpose is to punish the wrongdoer/party in breach rather than to compensate the injured party (in which case it is referred to as a penal or penalty clause). One reason for this is that the enforcement of the term would, in effect, require an equitable order of specific performance. However, courts sitting in equity will seek to achieve a fair result and will not enforce a term that will lead to the unjust enrichment of the enforcing party.
In order for a liquidated damages clause to be upheld, two conditions must be met.