What's a Prenup? Sometimes, two people will enter into a contract before marriage, beginning rules about their marriage, and what is going to happen within the event of marriage breakdown. In the US, these agreements are commonly mentioned as prenuptial agreements. In Canada, prenups are more commonly mentioned as "domestic contracts" or "marriage contracts."
Additionally, two persons may—either before or during cohabitation—enter into a cohabitation agreement. If two persons who are cohabitating later marry, then their cohabitation agreement will become a domestic contract.