What the rule says
California does not impose a state estate tax. The state estate tax that California formerly imposed was effectively a pickup tax — a credit against the federal estate tax — and was eliminated when federal law changed in 2005. California's lack of an estate tax is one of the more notable features of the state's tax framework.
However, California residency at death produces tax consequences beyond the estate tax itself. California Revenue and Taxation Code § 17742 establishes that California taxes trust income based on the residency of the trust's fiduciaries (trustees) and beneficiaries. The rules apply both during the decedent's lifetime (for inter vivos trusts) and after death (for testamentary trusts and ongoing trust administration).
The key features of California's trust income tax regime:
- California residency of the trustee. A trust is California-resident for income tax purposes if any of its trustees are California residents. The trust's income is fully taxable in California regardless of the source of income or the residency of the beneficiaries. - California residency of beneficiaries. Even when no trustee is a California resident, California can tax trust income to the extent it is distributed (or required to be distributed) to California-resident beneficiaries. - Source-based taxation. California-source income (rental income from California real property, business income from California operations) is taxed in California regardless of trustee or beneficiary residency.
These rules apply during the trust's existence, which can extend many years past the decedent's death. They affect income tax treatment of trust earnings, including capital gains realized by the trust on sales of inherited assets.
What this means in practice
California residency for trust income tax purposes can produce substantial tax exposure for trusts with even tangential California connections:
- A non-California decedent's testamentary trust with a California-resident trustee. All trust income is taxed in California, regardless of where the trust assets are located or where beneficiaries live. - A non-California decedent's testamentary trust with California-resident beneficiaries. Distributions to California beneficiaries are taxed at California rates. Even retained trust income may be allocated to California beneficiaries through California's complex trust taxation rules. - California-resident decedent's testamentary trust. Generally California-resident, even if the trust later moves trustees out of state. - A non-California decedent who owned a California vacation home or rental property. California-source income from the property continues to be taxed in California after death.
California's trust income tax rules are among the most aggressive in the country. Combined with California's high marginal income tax rate (13.3% at the top bracket), the tax exposure can be substantial.
Income in respect of a decedent (IRD)
Income in respect of a decedent — accrued income at the time of death that retains its character when received by the beneficiary — receives no step-up in basis under federal Internal Revenue Code § 1014(c). California follows the federal treatment and taxes IRD when received by California-resident beneficiaries.
Common IRD includes: - Retirement account distributions. IRA, 401(k), and similar plan distributions taken by the beneficiary are taxed as ordinary income. - Final wages and salary owed at death. - Accrued bond interest. - Installment sale obligations. - Deferred compensation.
For a California-resident beneficiary, IRD is taxed at California's rates in addition to federal rates. The combined effective rate on retirement account distributions can exceed 50% for high-bracket beneficiaries.
Estate planning implications
The combination of no state estate tax and aggressive trust income tax produces several distinctive California planning considerations:
- No federal estate tax interaction at the state level. Unlike states with their own estate tax (NY, MA, OR, MN, etc.), California decedents face only the federal estate tax. The federal exclusion ($13.99M per individual in 2026, indexed) means most California estates owe no estate tax. - Trust situs planning. Trust situs — where the trust is administered for tax purposes — can dramatically affect long-term tax exposure. A California-resident trust with significant assets may benefit from changing situs to a low-tax state if all California connections are eliminated. - California beneficiary considerations. Distributions to California-resident beneficiaries face California tax. Some trust structures defer distribution to non-California beneficiaries, but California's reach to California beneficiaries' income is technical. - Coordination with Proposition 19 considerations. Real property remains subject to California reassessment rules even when held in a trust.
What you can do about it
For California residents:
- Recognize California's lack of state estate tax. This is genuinely good news — many other states impose state-level estate taxes that California residents avoid. - Consider trust situs carefully. A California-resident trustee with substantial trust assets can produce ongoing California tax exposure. For trusts intended to benefit non-California beneficiaries with non-California assets, situs in a low-tax state may be appropriate. - Coordinate with non-California beneficiaries. Trust distributions to California-resident beneficiaries face California tax; distributions to non-California residents do not.
For non-California decedents with California connections:
- Beware California-resident successor trustees. Naming a California-resident successor trustee on a trust originating in another state can convert the trust to a California-resident trust with full state income tax exposure. - Consider California-source income tax. California real property and California-business income remain subject to California tax regardless of trustee/beneficiary residency. - Coordinate with California tax counsel before structuring trusts that may have California ties.
For heirs of California decedents:
- Distinguish step-up from IRD. Step-up at death substantially reduces capital gains tax on appreciated assets. IRD does not benefit from step-up and is taxed at ordinary rates when received. - Plan retirement account distributions carefully. Inherited retirement accounts are IRD and remain subject to California income tax for California-resident beneficiaries. Distribution timing affects tax outcomes.
Who this affects most
California's trust income and IRD rules are most consequential for:
- California residents with significant trust assets, particularly testamentary trusts that may continue for years - Non-California decedents whose estate plans include California trustees, beneficiaries, or assets - Heirs of decedents with significant retirement accounts subject to ongoing California taxation as distributions are received - High-net-worth California residents whose tax planning extends beyond the federal estate tax to encompass state income tax on trust earnings
California's lack of an estate tax is genuinely favorable, but the state's aggressive trust income tax regime and high marginal rates mean residents with substantial wealth still face meaningful state tax exposure throughout an extended trust administration period. Planning addresses both the federal estate tax framework and California's state income tax reach.