Question

Noah and Grace are both residents of, and domiciled in, California. When they were married, Grace had a separately-held investment account. At what point would this become community property?

Answer 1

Short answer: It doesn’t automatically become community property just because they married. Grace’s investment account remains her separate property unless something happens during the marriage to change its character — or unless the account produces income during the marriage (interest, dividends, capital gains), which is presumptively community property.

More detail — when the account (or part of it) would become community property:
- Income earned from the account during the marriage (interest, dividends, rent, realized gains) is community property unless she can trace that income to separate property by agreement or tracing rules.
- Contributions of community funds into the account (paying additional premiums, buying more securities with community money, depositing paychecks, etc.) convert those contributed amounts (and appreciation attributable to them) into community property.
- Substantial commingling: if Grace mixes separate and community funds in the account so separate funds can’t be traced, the separate funds can be treated as community property.
- Express transmutation: if Grace signs a written agreement (or otherwise complies with the statutory requirements) expressly changing the account to community property, it becomes community property. California law generally requires transmutations to be in writing and signed by the spouse whose interest is affected.
- Conversely, property acquired after legal separation remains separate property.

Practical advice: keep separate-account records, avoid using community funds to invest in the separate account, and use written agreements (prenup/postnup) if you intend to change character.

If you want, tell me more facts (were community funds ever deposited, did she sign any agreement, did the account earn dividends during the marriage, is tracing possible) and I’ll apply the rules to the specific situation.