Parties can make an agreement in writing, called a Marriage, or pre­nuptial agreement, before marriage, to take effect upon marriage, setting out their rights of property and rights to support, property division and other incidents of a relationship between them which may override other provisions under the law.

A cohabitation agreement can be made between partners either before or after they begin living together in a common­law relationship. Unless it is stated in the agreement or later amended in writing, such agreement may not be valid as a marriage agreement.