Families with large estates in Washington state face a direct hit starting this month. For anyone who dies on or after July 1, 2026, the state’s estate tax rates revert to a graduated schedule topping out at 20% on taxable estates of $9,000,000 or more. That rate replaces a temporary structure, in effect since July 1, 2025, that carried a top bracket of 35%. The shift means the highest-value estates will owe less in state tax than they would have under the one-year surcharge, but the 20% ceiling still ranks among the steepest state-level estate taxes in the country.
How the restored 20% rate changes the math for large estates
Washington’s estate tax now operates under three distinct date-of-death windows written directly into state law. Deaths before July 1, 2025, fell under the original graduated schedule with a 20% top rate. Deaths on or after July 1, 2025, but before July 1, 2026, triggered the temporary schedule carrying a higher bracket that reached 35%. Deaths on or after July 1, 2026, snap back to the 10%-to-20% graduated table, as outlined in the Department of Revenue’s online estate tax guidance.
The practical difference is significant. An estate valued well above $9,000,000 that would have been taxed at 35% on its highest slice under the temporary schedule now faces a top rate 15 percentage points lower. For heirs and executors, that gap can translate into hundreds of thousands of dollars in reduced liability, depending on the size of the taxable estate and how much of it falls into the upper brackets.
The legislative vehicle behind these changes is Senate Bill 6347, which laid out the restored graduated rate schedule and tied each bracket directly to the decedent’s date of death. The bill amended the state’s estate tax statute so that each table is activated strictly by when the person dies, not when the return is filed or when assets are distributed to beneficiaries.
Those provisions are now codified in RCW 83.100.040, which contains explicit date-of-death clauses governing which rate table applies. The statute confirms that the 35% bracket was always intended as a temporary surcharge and that, beginning with July 2026 deaths, the permanent structure reverts to the lower 20% ceiling. For families with substantial real estate holdings, closely held businesses, or concentrated investment portfolios, that timing detail can materially change how much of the estate ultimately passes to heirs versus the state.
Signs the temporary 35% bracket reshaped estate planning behavior
The one-year window of the 35% top rate created a strong incentive for wealthy Washington residents to accelerate wealth transfers before dying or to restructure holdings through trusts and lifetime gifts. Estate planners across the state likely saw increased demand for strategies designed to reduce the taxable estate below the $9,000,000 threshold where the highest rate kicks in, or to move appreciating assets out of the estate before they generated additional exposure to the top bracket.
Typical responses in such environments include larger annual exclusion gifts, the use of irrevocable life insurance trusts to keep policy proceeds outside the taxable estate, and the creation of family limited partnerships or LLCs to shift future growth to younger generations. Some individuals may also have considered relocating primary tax residency to states without an estate tax, although doing so requires more than simply buying property elsewhere.
Whether that behavioral shift actually occurred at scale is not yet visible in public data. The Washington Department of Revenue has not released filing-pattern statistics covering the July 2025 through June 2026 period, and no official projections exist for how much revenue the temporary 35% rate generated compared with the standard schedule. Future filing data could reveal whether estates clustered just below key bracket thresholds, whether more decedents reported extensive lifetime gifting, or whether trust structures became more prevalent in returns filed for deaths during the surcharge window.
For now, advisors say the expiration of the 35% top rate removes some urgency but not the underlying need for planning. The restored 20% ceiling still applies at relatively modest levels compared with the federal estate tax, and Washington does not offer a separate “portability” election for unused spousal exemption the way federal law does. That combination means couples with combined wealth approaching the state threshold may have to rely on traditional tools such as credit shelter trusts if they want to fully use both spouses’ state-level exemptions.
Executors handling estates for deaths that occurred during the July 2025–June 2026 window face a different challenge: ensuring they apply the correct temporary table and document the date-of-death rules in their files. For deaths on or after July 1, 2026, the focus shifts to modeling how the lower top rate interacts with other planning choices, including charitable bequests, business succession plans, and decisions about whether to sell or retain illiquid assets to cover the tax.
As more data emerges on how taxpayers responded to the one-year surcharge, lawmakers and advocates will gain a clearer picture of whether steep, short-lived rate hikes meaningfully change behavior or simply add complexity and timing risk for families. In the meantime, Washington’s experience underscores a broader lesson for high-net-worth households: estate tax rules can change quickly, and the precise date of death can be just as important as the size of the estate in determining the final tax bill.
