The agreement may limit spouse status (although a court may annul it in the event of divorce if it finds the restriction to be unscrupulous). The agreement can be used as a contract to make a will that obliges one of the spouses to take care of the other in the event of death. It may also restrict inheritance taxes upon death, such as the right to an estate allowance, the right to act as executor, the right to take as a predetermined heir, etc.  In California, registered domestic partners can also perform a prenup. Post-marital agreements are treated very differently in California law. Spouses have a fiduciary duty to each other, so prenutial agreements fall under a special category of agreements. .