Washington Estate Tax Deductions: What You Can Deduct to Reduce the Tax Bill

When a Washington estate approaches the $3,000,000 filing threshold, every deductible expense matters. The difference between a gross estate of $3,200,000 and a taxable estate of $2,800,000 can mean the difference between owing significant state tax and owing nothing at all. And even for estates that clearly cross the threshold, deductions reduce the tax dramatically — Washington's graduated rates make each dollar of deduction valuable.

Here is a complete breakdown of what Washington allows.

Deductions That Reduce the Taxable Estate

Washington uses a calculation form called Table W to determine the estate tax. The starting point is the gross estate — every asset the decedent owned or had an interest in, worldwide. From there, allowable deductions bring you to the "Washington taxable estate." The tax is then applied to that lower number.

1. Funeral and Burial Expenses

All ordinary and necessary funeral expenses are deductible. This includes:

• The funeral home's service fee
• The casket or urn
• Cemetery plot and opening/closing fees
• Headstone or grave marker
• Obituary publication costs
• Transportation of remains
• Costs of the funeral reception and related gatherings

Washington's rule on funeral expenses contains a critical advantage that many out-of-state CPAs miss. In non-community-property states, funeral expense deductions are often reduced by 50% when the estate is jointly owned. Washington does not apply this reduction to community property estates. Funeral expenses paid from community property funds are 100% deductible against the Washington taxable estate, not 50%.

This matters for families paying $15,000 to $25,000 for a traditional funeral. A full deduction, rather than a 50% deduction, can shift the taxable estate calculation meaningfully.

Human composting (Natural Organic Reduction) and water cremation: Washington was the first state to legalize Natural Organic Reduction in 2019, and Alkaline Hydrolysis has been permitted since 2020. Both are treated identically to traditional burial or cremation under the estate tax deduction rules. If the decedent chose human composting or water cremation — a choice that typically costs $3,000 to $7,000 — those costs are fully deductible as funeral expenses. The unusual method of disposition does not affect deductibility.

2. The Marital Deduction

If any portion of the estate passes to a surviving spouse or state-registered domestic partner, that transfer qualifies for an unlimited marital deduction. It is literally unlimited — a spouse can receive the entire estate, and the marital deduction shields 100% of that value from Washington estate tax at the first death.

This is the primary reason most Washington estates with a surviving spouse owe no estate tax at the first death. The entire estate passes to the survivor under the marital deduction, with zero tax at that time.

The problem is what happens at the second death. More on that below.

3. Administrative and Legal Expenses

Reasonable costs of administering the estate are deductible, including:

• Attorney fees incurred during probate
• Executor/Personal Representative fees (if applicable)
• CPA fees for preparing the estate tax return and fiduciary income tax return
• Appraiser fees for real estate and business interests
• Court filing fees, recording fees, and publication costs
• Storage and management costs for estate property during administration

These deductions are subject to the same reasonableness standard as on the federal Form 706. Inflated fees for personal services rendered by a family member who happens to be the executor would be scrutinized by the Department of Revenue.

4. Debts and Liabilities

Mortgages and other secured debts owed by the decedent are deductible against the value of the corresponding asset. If the decedent owned a home worth $800,000 with a $300,000 mortgage, the net value contributing to the gross estate is $500,000.

Other deductible debts include:

• Unsecured personal loans and credit card balances
• Unpaid income taxes (both federal and state, including the decedent's final income tax liability)
• Unpaid property taxes accrued through the date of death
• Medicaid estate recovery claims from DSHS (if the decedent was an Apple Health/Medicaid recipient)

Note that DSHS Medicaid recovery claims are treated as priority creditor debts, not estate tax deductions per se, but they reduce the net estate available for distribution and reduce the estate tax return's reportable net estate value.

5. The Spousal Personal Residence Exclusion

This is Washington-specific and frequently overlooked. Under Washington estate tax law, if the decedent and a surviving spouse owned a primary personal residence, the decedent's portion of the residence's value may be excluded from the gross estate for purposes of calculating whether the estate meets the $3,000,000 filing threshold — provided the residence passes either outright to the surviving spouse or into a qualifying irrevocable trust for the surviving spouse's benefit.

Example: The decedent's gross estate is $3,400,000. Of that, $500,000 represents the decedent's half of a primary residence passing to the surviving spouse. The Spousal Personal Residence Exclusion reduces the gross estate to $2,900,000 — below the $3,000,000 threshold. No Washington estate tax return is required.

This exclusion can rescue hundreds of thousands of Washington families, particularly those in high-cost markets like King, Snohomish, and Clark counties where homes that were purchased decades ago are now worth well over $1,000,000.

6. Charitable Deduction

Bequests to qualifying charitable organizations (501(c)(3) nonprofits, governmental units, and certain other organizations) are fully deductible from the Washington taxable estate. A $500,000 charitable bequest reduces the taxable estate by $500,000. Combined with the estate tax rates, this can be a meaningful planning tool for estates with philanthropic goals.

What Cannot Be Deducted

Not everything reduces the Washington taxable estate:

• Personal living expenses incurred after the date of death (heating the house while the estate is being settled, for example) are not deductible
• Income taxes owed by the estate (as opposed to taxes owed by the decedent at death) are generally not deductible on the estate tax return
• Any debt that is already reflected in the value of the asset (like a mortgage already subtracted from the real estate value) cannot be deducted again

The Qualified Family-Owned Business Interest (QFOBI) Deduction

A separate, powerful deduction exists for family farms and closely held businesses. The QFOBI deduction allows the estate to deduct the full value of a qualifying family business interest, up to a maximum of $3,076,000 for the entire 2026 tax year. This deduction exists in addition to the $3,000,000 applicable exclusion, potentially zeroing out the Washington estate tax entirely for qualifying farm estates.

The QFOBI deduction has strict eligibility rules and a recapture provision if the heir ceases to operate the business within three years. It is covered in detail in a separate article.

Filing Mechanics: Table W and My DOR

All deductions are reported on the Washington Estate and Transfer Tax Return, which is filed electronically through the Department of Revenue's My DOR portal within nine months of the date of death. The return is organized around a gross-to-net calculation that produces the Washington taxable estate, which is then run through the Table W rate schedule to produce the tax.

Addendums for specific deductions (like the QFOBI) must be filed simultaneously with the main return via My DOR.

The Washington Final Tax & Estate Tax Guide at /us/washington/estate-tax/ includes a complete deduction worksheet, the Table W tax calculation for both pre- and post-July 2026 dates of death, and the exact documentation you need to support each deduction in the event of a Department of Revenue audit.

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