A couple of questions. First, can two individuals in a marriage or domestic partnership in a community property state essentially "sign away" the community property law rules? In short, can two people sign a simple agreement basically saying that they agree to keep all income and property as separate property EVEN DURING the marriage? My guess is that this is almost akin to a prenuptial (or postnuptial) agreement in many regards. You're basically keeping incomes and property separate even if you're living in a community property state. Of course, some limited assets would be shared when agree to. Also, how much does a normal and simple prenuptial (or community property agreement) usually cost? My guess is that a rather typical format would be little work. $300? $500? $750? More?