Probate and Taxes in California:
Every Tax Issue That Arises at Death

Probate Is a Tax Event — Multiple Times Over

Most California families think of probate as a legal process — filing court papers, paying debts, distributing assets. What they often don't realize until they're in the middle of it is that probate is also a series of overlapping tax events, each with its own deadlines, filing requirements, and potential for costly mistakes.

Understanding all of the tax obligations that arise during California probate — before the process begins — is one of the most important things an executor, beneficiary, or estate planning attorney can do.

Tax Issue #1: The Decedent's Final Income Tax Return

The executor must file a final federal Form 1040 and California Form 540 for the year of the decedent's death. This return covers income from January 1 through the date of death. Deductions and credits function largely as they would on a regular return, but the surviving spouse (if any) may file jointly for the year of death.

Missing this return creates IRS and FTB penalties that become obligations of the estate. The executor has legal responsibility for ensuring this return is filed on time.

Tax Issue #2: Fiduciary Income Tax During Administration

Any income earned by estate assets after the date of death must be reported on IRS Form 1041 (and California FTB Form 541). This includes interest, dividends, rent, and business income. See our complete guide: Estate Income During Probate.

Tax Issue #3: Federal Estate Tax (If Applicable)

For estates exceeding the federal exemption ($13.61 million per individual in 2024), a federal estate tax return (Form 706) must be filed within 9 months of death (extendable to 15 months). The federal estate tax rate is 40% on the amount above the exemption. Even if no tax is owed, filing Form 706 may be required to elect portability of the unused exemption to the surviving spouse — a critically important step that is easy to miss.

Tax Issue #4: California Property Tax Reassessment Under Prop 19

When real property passes through probate to heirs, Proposition 19 applies. For most inherited property — including rental homes, vacation properties, and commercial real estate — the property is reassessed to current market value at transfer, often dramatically increasing annual property taxes. Only a primary residence transferred to a child who will also use it as their own primary residence qualifies for even a limited exclusion.

This reassessment can represent an ongoing annual cost of thousands of dollars per year — often larger than any one-time tax bill. See our full Prop 19 guide for details.

Tax Issue #5: Capital Gains at Sale of Estate Assets

When the executor sells estate assets during probate administration — such as real estate, stocks, or business interests — capital gains tax applies on any gain above the stepped-up basis established at the date of death. The good news: the stepped-up basis can significantly reduce or eliminate the gain. The bad news: if assets are sold below their stepped-up value (a loss), that loss flows to the estate and eventually to beneficiaries via Schedule K-1.

Tax Issue #6: Beneficiary Income Tax on Distributions

When beneficiaries receive distributions of income from the estate (as opposed to principal), they must report that income on their own personal returns. The executor reports these distributions to each beneficiary on Schedule K-1 (Form 1041). Beneficiaries must include K-1 income on their own federal and California returns regardless of whether they received a cash distribution.

Tax Issue #7: Retirement Account Distributions (IRD)

IRA and 401(k) accounts that pass to named beneficiaries outside of probate are still a major tax event. Traditional retirement accounts are almost entirely Income in Respect of a Decedent (IRD) — meaning distributions are taxed as ordinary income to the beneficiary, with no stepped-up basis. Under SECURE Act rules, most non-spouse beneficiaries must fully distribute inherited IRAs within 10 years. This can create a large, predictable stream of taxable income that requires careful tax planning.

The Interaction: Why These Can't Be Planned in Isolation

What makes California probate taxation particularly challenging is that all of these issues interact with each other. The timing of asset distributions affects income tax; the allocation between principal and income affects beneficiary K-1s; whether an asset is sold or distributed in-kind affects capital gains; whether a surviving spouse makes the portability election affects estate tax. Each decision has ripple effects on the others.