If you want to keep things separate you should not co-mingle (pool) money from pre-registration and post-registration in checking accounts or savings accounts; nor accumulate debt together post-registration on any pre-registration individual accounts. You need to keep all accounts from pre-registration and post-registration separate. So if A had a checking account and B had a checking account, then A + B get registered as domestic partners to protect their individual accounts they should get a third joint account for all money acquired post-registration. If you take the pre-registration checking account of B and add a post-registration paycheck from A or B to it then the entire account comes to be seen as community property. An analogous thing happens with debt, say A had a credit card with $10,000 on it pre-registration, then post registration that card is used to buy household groceries every week and other expenses, then the debt goes up to $12,000; now all $12,000 of debt is community debt. Etc.
Disclaimer Information on this site is provided by Brian Scott Wayson as general information, not legal advice, and use of this information does not establish an attorney-client relationship. If you have questions about your specific situation, please call an attorney.