A postnuptial agreement is a written agreement executed after a couple gets married, or have entered a civil union, to settle the couple’s affairs and assets in the event of a separation or divorce. It may be “notarized” or acknowledged and may be the subject of the statute of frauds.

Like the contents of a prenuptial agreement, provisions vary widely but commonly includes provisions for division of property and spousal support in the event of divorce, death of one of the spouses, or breakup of marriage.