Do you wish you had negotiated a property agreement before you had gotten married? It’s not too late to clarify your intentions regarding property rights. Husbands and wives can make valid agreements during marriage to change community property to separate, separate to community, or to alter the status of their earnings. What you earn from work during marriage is community property. That’s the default rule. But you can change that with a written agreement. It is advisable to create a written agreement with the help of a mediator, who will be able to assist with the negotiations.