A condition in a contract that causes the contract to become invalid if a certain event occurs. This is different from a condition precedent. The happening of a condition subsequent may invalidate a contract which is, until that moment, fully valid and binding. In the case of a condition precedent, no binding contract exists until the condition occurs. See also "condition precedent".

If this condition takes place, it will end a current obligation or will defeat an estate that currently exists.

Condition the failure or nonperformance of which may defeat an estate already vested.

a condition placed on the title where some specified occurrence in the future (subsequent) will cause a loss of title (condition)

an event the occurrence of which discharges the obligation

A fee simple estate, may be qualified by a condition subsequent. This means that the new owner must not perform some action or activity. The former owner retains a right of reentry so that if the condition is broken, the former owner can retake possession of the property through legal action. Conditions in a deed are different from restrictions or covenants because of the grantor's right to reclaim ownership, a right that does not exist under private restrictions. (See fee simple, restrictive covenant).