Washington's "No Income Tax" Era Is Over — Sort Of
For over a century, Washington State has marketed itself as an income-tax-free haven. It's been a core part of the state's identity, a recruiting pitch for tech workers, and a reason retirees chose the Puget Sound over Portland. That story just got a lot more complicated.
With the passage of SB 6346, signed on March 30, 2026, Washington has enacted a millionaire income tax — the first direct tax on earned income in a state that has avoided one since statehood in 1889. Combined with the 7% capital gains tax already on the books, Washington's "no income tax" label now comes with some very large asterisks.
What SB 6346 Actually Does
The new law imposes a tax on individual income exceeding $1 million per year. It applies to wages, business income, and other forms of ordinary income — not just investment gains, which are already covered by the separate capital gains tax.
Key details:
- Threshold: a $1 million standard deduction per individual. Critically, this does not
double for couples — spouses and domestic partners share a combined $1 million deduction
regardless of whether they file jointly or separately.
- Rate: 9.9% on Washington taxable income above the deduction
- Effective date: 1 January 2028. The first tax payments and returns are due in calendar
year 2029.
- Revenue: projected at roughly $4 billion a year for
health care and education, reaching about 30,000 households.
This is narrowly targeted — the state estimates it reaches about 30,000 households. The vast majority of Washingtonians will never hit the threshold. But for high earners — particularly in the tech sector concentrated around Seattle — it's a meaningful new cost of living in the state.
The Capital Gains Tax Set the Stage
Washington's capital gains tax, which took effect in 2022, was the first crack in the no-income-tax wall. It applies to gains exceeding $278,000 (indexed for inflation) from the sale of stocks, bonds, and other capital assets. Real estate is excluded. The rate was a flat 7% at the outset; SB 5813 added a second tier for tax year 2025 onward, so the first $1 million of taxable gains is taxed at 7% and anything above that at 9.9%.
The state Supreme Court upheld the tax in March 2023 in a controversial decision. The key legal maneuver: the court classified the capital gains tax as an excise tax on the transaction of selling assets, rather than a tax on income. That distinction allowed it to survive a state constitutional provision that many legal scholars believe prohibits a graduated income tax.
The millionaire tax relies on similar legal reasoning — and that's where the fight begins.
The Constitutional Challenge
Washington's constitution, Article VII, Section 1, requires that "all taxes shall be uniform upon the same class of property." Courts have historically interpreted this to prohibit graduated income taxes, since income was classified as property.
The capital gains tax survived by being recharacterized as an excise tax. The millionaire tax will almost certainly face the same legal gauntlet:
- Opponents argue this is transparently an income tax by any reasonable definition, and that the excise-tax workaround cannot be stretched indefinitely
- Supporters argue the precedent is already set — if the capital gains tax is a valid excise tax, taxing high-income transactions follows the same logic
- Legal experts are split, and a challenge was filed within days of the signing
Expect this to reach the Washington Supreme Court well before the tax takes effect in 2028. If the court strikes it down, the legislature will likely push for a constitutional amendment — a much higher political bar.
Washington's Full Tax Picture
The income tax conversation can't happen in isolation. Washington has always compensated for its lack of an income tax with aggressive taxation everywhere else.
| Tax Type | Washington | National Average |
|---|
| State + local sales tax | 9.23% (avg combined) | 6.6% |
| Property tax | ~1.0% effective rate | ~1.1% |
| B&O tax (business) | 0.471% – 1.5% of gross receipts | N/A (most states tax net income) |
| Capital gains tax | 7% above $278K; 9.9% above $1M of taxable gains | Varies widely |
| High-earner income tax | 9.9%, effective 2028 | Varies |
| Estate tax | Yes, from ~$2.193M | Only 12 states and D.C. |
The Business and Occupation (B&O) tax deserves special attention. Unlike most states, which tax business profits, Washington taxes gross receipts — meaning businesses pay whether they're profitable or not. For low-margin businesses, this can be more punitive than a traditional corporate income tax.
When you stack sales tax, B&O tax, property tax, capital gains tax, and now the millionaire tax, Washington's total tax burden for high earners starts looking less like a tax haven and more like a tax labyrinth.
How This Changes the Calculus
For W-2 Employees Earning Over $1M
This is the most direct hit. A software executive earning $2 million in total compensation would owe the new tax on $1 million of income. With the SALT deduction capped at $40,400, a high earner in this position has almost certainly exhausted the cap on other state and local taxes already, so the new tax is effectively a pure additional cost.
For Business Owners
The combination is particularly harsh. A business owner already pays B&O tax on gross receipts, capital gains tax on investment income, and now the millionaire tax on ordinary income. Washington may still beat California's 13.3% top rate, but the gap has narrowed considerably.
For Retirees
Most retirees won't be affected — Social Security and pension income typically fall well below the threshold. But retirees with large capital gains from selling a business or investment portfolio face both the capital gains tax and potentially the millionaire tax in the same year.
Comparison to Other "No Income Tax" States
Washington's trajectory stands in stark contrast to the other states that don't levy a broad income tax:
| State | Income Tax | Capital Gains Tax | Estate Tax | Notable |
|---|
| Washington | 9.9% high-earner tax (2028) | 7% above $278K; 9.9% above $1M | Yes (up to 20%) | Also has B&O tax |
| Florida | None | None | None | Clean no-income-tax status |
| Texas | None | None | None | Higher property taxes |
| Nevada | None | None | None | Commerce tax on gross revenue |
| Tennessee | None | None | None | Repealed the Hall tax for 2021 |
| Wyoming | None | None | None | Truly minimal state taxes |
Florida, Texas, and Wyoming maintain a genuinely clean no-income-tax posture. Washington is increasingly the outlier — a state that technically doesn't have a "broad" income tax but has layered on targeted taxes that hit high earners from multiple angles.
What Happens Next
Three things to watch:
-
The lawsuit. If the millionaire tax is struck down, the legislature's next move — likely a constitutional amendment ballot measure — will define Washington's tax future for a generation.
-
Migration patterns. Washington has already seen some high-profile departures to states like Texas and Florida. If the millionaire tax survives legal challenge, expect this trickle to accelerate among the most mobile earners.
-
The revenue question. Washington has a structural budget challenge. Sales tax revenue is volatile, and the state's population and infrastructure needs are growing. Whether the millionaire tax generates enough revenue to matter — or whether it drives away the tax base it targets — is an open question.
For anyone earning significant income in Washington, the old assumption that "no income tax" means lower taxes is worth revisiting. Run the numbers for your specific situation — total tax burden, not just income tax, is what matters.
This article is for informational purposes only and does not constitute tax advice. Consult a qualified tax professional for guidance specific to your situation.