Perpetuities, Rule Against

PERPETUITIES, RULE AGAINST - The rule against perpetuities is one of the most complicated parts of estate planning to explain. Basically, common law disfavors and prevents property from being held perpetually in trust, and therefore, voids any agreement (varies from state to state) which does not end twenty-one years after a life in being, or one generation from lives presently in being plus twenty-one years.