Washington has its own estate tax, separate from the federal estate tax. For deaths from July 1 through December 31, 2026, the Washington exclusion is $3 million and the graduated rates run from 10% to 20%. For deaths in the first half of 2026, the exclusion was $3.076 million and the top rate was 35%. The date of death controls—not the date you file the return.
A founder can owe no federal estate tax and still leave a substantial Washington estate-tax bill. A house, retirement accounts, life insurance included in the estate, and private-company stock can add up quickly. You do not need a $15 million estate to have a Washington problem.
Updated September 7, 2026. This guide is general information, not legal or tax advice.
Washington estate tax exemption in 2026
The “exemption” is technically the applicable exclusion amount. Recent changes make a single undated number misleading.
| Date of death | Washington exclusion | Rate range |
|---|---|---|
| July 1–December 31, 2025 | $3,000,000 | 10%–35% |
| January 1–June 30, 2026 | $3,076,000 | 10%–35% |
| July 1–December 31, 2026 | $3,000,000 | 10%–20% |
The current statute sets the exclusion by death date. Although it includes an adjustment provision for 2027 and later, DOR currently says the amount is not set to increase because the statute references an expired CPI. Do not build an estate plan around an assumed future increase. Check DOR’s published amount for the applicable year.
For the legislative history, see Washington’s 2026 estate-tax rollback.
Washington estate tax rates: 10% to 20% after July 1, 2026
The brackets apply to the Washington taxable estate after the exclusion and allowable deductions, not to the entire gross estate. Each rate applies only to the amount within that bracket.
| Washington taxable estate bracket | Marginal rate |
|---|---|
| First $1 million | 10% |
| $1 million–$2 million | 14% |
| $2 million–$3 million | 15% |
| $3 million–$4 million | 16% |
| $4 million–$6 million | 18% |
| $6 million–$7 million | 19% |
| $7 million–$9 million | 19.5% |
| Above $9 million | 20% |
These are the rates for deaths on or after July 1, 2026 under RCW 83.100.040. Use DOR’s estate-tax tables for other death dates.
Two simple examples
Assume a death in the second half of 2026, an estate entirely subject to Washington tax, and no deductions other than the $3 million exclusion. These illustrations omit federal tax and special adjustments.
- $4 million estate: $4 million minus $3 million leaves $1 million taxable. Washington estate tax is $100,000.
- $5 million estate: $2 million is taxable. The first $1 million produces $100,000 of tax; the next $1 million produces $140,000. Total: $240,000.
The top rate is not a flat tax on everything you own. Equally, being below the federal exemption does not make these state liabilities disappear.
Who must file a Washington estate tax return?
Generally, filing is required when the gross estate exceeds the applicable threshold and the decedent was domiciled in Washington, or was a nonresident owning Washington real estate or tangible personal property. The threshold test looks at property wherever located, not just Washington assets. A return can be required even when deductions eliminate the tax.
There is a special rule for a qualifying spousal personal residence when testing the filing threshold. It is not a general exclusion of your home from estate tax. See DOR’s spousal residence guidance and the estate-tax FAQ.
Start with an inventory of assets and ownership. A revocable trust or a beneficiary designation does not, by itself, establish that an asset is outside the taxable estate. For business interests, get a defensible valuation rather than assuming the last financing price answers the estate-tax question.
Washington estate tax vs. federal estate tax
The federal basic exclusion is $15 million for 2026. Prior taxable gifts can affect the amount available at death. Washington’s much smaller exclusion means state planning matters for families far below the federal threshold.
Washington taxes the transfer at death; it does not impose a separate inheritance tax on a beneficiary merely for receiving an inheritance. An inherited asset can still produce taxable income later. Estate tax, tax basis, and tax on a later sale are different questions.
For the sale side, read the Washington capital gains tax guide. For the broader income-tax picture, see Washington’s state income tax guide.
Married couples: Washington has no estate-tax portability
Washington does not let a surviving spouse automatically use a deceased spouse’s unused exclusion. Federal portability is a separate election with its own filing requirements. Do not assume a couple has an automatic $6 million Washington exemption.
Qualifying transfers to a spouse can defer estate tax. Deferral and preserving both spouses’ exclusions are different planning objectives. Trust design, asset ownership, beneficiary designations, and the survivor’s needs should be reviewed together. See DOR’s explanation of portability and deductions.
What founders and business owners should review
- Liquidity. Private stock may be valuable without being easy to sell. Identify how the estate would fund taxes and expenses before assuming the company can redeem shares or a buyer will appear.
- Ownership and valuation. Keep cap tables, transfer restrictions, buy-sell agreements, and trust documents consistent. A tax plan that ignores the stockholders’ agreement can be hard to execute.
- Gifts and basis. Giving away appreciated property can change both estate exposure and the recipient’s future income-tax result. Compare the combined consequences; reducing the estate alone is not the whole calculation.
- Business-specific relief. Ask whether a family-owned-business deduction or closely held business payment provisions apply. These have conditions; owning startup stock is not enough by itself.
- Domicile. Estate-tax residence turns on domicile at death. Moving is a facts-and-documentation exercise, and retaining Washington real estate can leave state exposure.
For coordinated planning, see estate planning before 2028 and the Washington domicile strategy guide. Income-tax day-count rules should not be treated as an estate-tax safe harbor.
Washington estate tax deadline and how to file
The return and payment are generally due nine months after death. A six-month filing extension does not extend the payment deadline; unpaid tax accrues interest. Executors and preparers can use My DOR to register the estate, file, request an extension, and make payments.
Calendar the deadline immediately. Then assemble the asset inventory, date-of-death valuations, debts, expenses, trust documents, and any federal return information. If the estate is illiquid, investigate available payment relief before the due date rather than assuming a filing extension solves the cash problem.
Where to go next
Use the Washington Taxes hub to compare estate tax with capital gains, income, residency, and Seattle business taxes. If a business sale, transfer, or move is approaching, bring the estate plan into the discussion before the transaction is fixed.
