In California, a couple may waive their property-sharing (co-ownership) rights through a prior contract.  The agreement may limit sp assistance (although a court may set it aside in the event of a divorce if it considers the restriction to be unacceptable). The agreement can be used as a contract to make a will that requires one spouse to take care of the other in the event of death. It may also restrict inheritance law in the event of death, such as the right to inheritance allowance, the right to execution, the right to take as a predetermined heir, etc.  In California, registered national partners may also enter into a prenup. Post-marriage agreements are treated very differently in California law. Spouses have a fiduciary duty to each other, so pre-marital agreements fall into a particular category of agreements. There is a presumption that the post-parental agreement was obtained by undue influence when a party gains an advantage. Disclosure cannot be abandoned as part of a post-marriage agreement. [Citation required] When a U.S.
citizen decides to marry an immigrant, that person often serves as a visa sponsor to ask his fiancée to enter or stay in the United States. The Dept. Homeland Security requires that persons who sponsor their fiance come to the United States on a visa to make a declaration of support and it is important to consider the obligation under oath to support a U.S. sponsor about to sign a pre-married agreement. The Asidavit of Support establishes a 10-year contract between the U.S. government and the sponsor, which requires the sponsor to financially support the fiancé on its own resources.  As expressly stated on Form I-864, divorce does not end the obligations of assistance owed by the promoter of the U.S. government and the immigrant spouse to rights as a third party beneficiary of the sponsor`s promise of support in the affidavit I-864. As such, any waiver of support in their marriage contract must be formulated in a manner that is not contrary to the contract that the U.S. sponsor makes with the government by providing affidavit support or may be declared unenforceable. Marriage contracts in Canada are subject to provincial legislation.
Every province and territory in Canada recognizes marital agreements. For example, in Ontario, marital agreements are called marriage contracts and are recognized by Section 52 of the Family Law Act.  Pre-marital agreements generally provide that certain or all assets and commitments that each spouse brings to the marriage are treated as their own assets or obligations. The agreements also specify, as a general rule, how common property is distributed in the event of divorce and how assets or liabilities accumulated during the marriage are treated. The Commonwealth of Virginia maintains the written agreements before marriage. They must be signed by both parties without legal consideration and must not be contrary to public order or criminal laws. The content of a matrimonial agreement relates to provisions relating to the distribution of property and assistance to the spouse in the event of adultery. They may also include conditions for the loss of assets following a divorce for adultery.
Marriage contracts are recognized in Australia by the Family Law Act of 1975 (Commonwealth).  In Australia, a marriage contract is called binding financial agreement (BFA).  While no one wants to consider divorce even before they marry, marital agreements (or pre-marital agreements) must set certain conditions in the event of the end of marriage. For example, a person with an established family business may attempt to protect those assets from the other party in the event of a divorce.