Disclaimer: I’m not an attorney or accountant/CPA, and this is not legal or tax advice. Check anything I say here with your own attorney or tax advisor.
There are currently nine community property states, and a few others*** that allow the creation of community property. In Washington state, where I live, married couples’ property earned during their marriage is generally considered community property, such as income, property purchased, etc. Any property earned PRIOR to the marriage is considered separate property, unless the couple intentionally commingles it. Any gifts or inheritances received by one spouse during the marriage are also considered separate property.
IRS’s step-up basis rule defaults for differently-titled accounts in community property states
Individual accounts
When one spouse dies, any taxable assets held in that spouse’s individual taxable account should receive full step basis at death, meaning the surviving spouse can sell or gift those assets tax-free at the time of the deceased spouse’s death.
JTWROS
Any assets held in a Joint Tenants With Right of Survivorship (JTWROS) account could potentially only receive step-up basis on HALF the account’s value per default IRS treatment, but that half will transfer immediately to the other spouse without going through probate. JTWROS is usually the ‘default’ joint brokerage type at major brokerages. (For homes purchased while married, community property is the assumed ownership type for real estate in Washington state.)
I believe you can make the case to the IRS that the entire balance should be treated as community property, but that this might not work out and would be a hassle vs using a JCP. California may NOT respect this treatment at all with JTWROS, so either way, a JCP seems ‘safer’.
Joint Community Property (JCP) and CPWROS
If instead a couple chooses to move their assets into a joint community property account, the account MUST go through probate (no beneficiaries are allowed to be assigned), BUT it will receive double-step up basis at death, meaning the entire account balance will be stepped up when only one spouse passes away. Even better is a Community Property With Right of Survivorship (CPWROS) account, which allows double-step up basis AND avoid probate for the surviving spouse. This can be a huge tax advantage to the surviving spouse if there are highly-appreciated securities in that account. The con side is that the account must go through probate, but in Washington state, that is usually not a big deal, assuming that both spouses have their wills up to date. (Californians should do their own homework on the value of avoiding probate, as I understand it is much more onerous.)
Should married couples move their taxable assets into community property accounts?
The tradeoff is (1) potential tax-savings for the surviving spouse or other heirs that the surviving spouse might want to gift to vs (2) probate and (3) the loss of separate property treatment in the event of a divorce.
If one spouse had a significant inheritance from their parents that they’ve kept separately in their own individual account, a judge would likely award all of that to them in the event of a divorce, since it would be clearly their own separate property. If that spouse chooses to transfer any of that inheritance to a community property account, it is now owned 50-50 by both parties, and loses it’s separateness.
So, if you are not worried about divorce, you ARE worried about avoiding capital gains taxes, and you’re ok with the assets going through probate, moving money to a joint community property brokerage can be a wise move.
Recommendation
For older couples in solid relationships who are unlikely to ever divorce and who are comfortable navigating probate in their state (ex: Washingtonians), I would recommend they move their individual or JTWROS equity assets to a joint community property account to prepare for one of them passing away to avoid future capital gains taxes.
For younger couples in good health or with low capital gains with unequal amounts of separate property, it might be a good idea to wait on commingling everything into a community property brokerage in case they ever decide to separate, as roughly 50% of all marriages do.
Point of clarification
Retirement accounts like 401ks, IRAs, or other individual-only accounts like HSAs, are NOT eligible to be community property. Generally, taxable brokerage accounts, bank accounts, and real estate are things to consider making community property.]
Appendix
*** Wikipedia as of 2026-08-04: “Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin [are community property states.]
Four other states have adopted optional community property systems. Alaska allows spouses to create community property by entering into a community property agreement or by creating a community property trust.[2] In 2010, Tennessee adopted a law similar to Alaska’s and allows residents and non-residents to opt into community property through a community property trust.[3] More recently, Kentucky adopted an optional community property system in 2020, allowing residents and non-residents to establish community property trusts.[4] Finally, Florida adopted a similar law in 2021, allowing citizens and noncitizens to establish community property trusts.”







