Will Washington’s new 9.9% tax make wealthy residents leave? Opponents say it could, but no measured, causal exodus has been established. The tax does not begin until January 1, 2028, and available sources do not quantify how it will affect migration, revenue, or the wider economy.
What Washington actually enacted
Washington law imposes a 9.9% tax beginning January 1, 2028, on an individual’s Washington taxable income. The statute describes the levy as 9.90 percent multiplied by Washington taxable income; it is not a tax on a person’s net worth or total assets.
“Millionaire tax” is the common political label, not the statute’s technical description. Legislative findings say households with annual adjusted gross income below $1 million will not owe the tax and estimate that about one-half of 1% of Washington households will be affected. That finding should not be confused with the statutory formula: the law taxes Washington taxable income, while the $1 million figure describes the intended household threshold in the legislature’s findings.
Income tax, not wealth tax
A wealth tax applies to net worth or specified assets. Washington’s enacted measure applies to taxable income received by individuals. It should also be kept distinct from Washington’s existing capital-gains tax and from separate proposals for a net-worth tax.
#1 Best Overall
Why lawmakers approved it
The legislature’s findings present the measure as a response to what lawmakers describe as Washington’s regressive tax system. They say revenue is intended for the general fund and priorities including K–12 education, health care, higher education, human services, and the Working Families Tax Credit.
Those statements are the legislature’s policy rationale, not an independent forecast of economic results. Whether the spending priorities produce the promised benefits will depend on implementation and future budget decisions.
The tax was part of a larger package
ESSB 6346 combined the new income tax with several other changes rather than enacting it as an isolated measure.
| Package provision | What it does |
|---|---|
| Individual income tax | Imposes a 9.9% tax on Washington taxable income beginning January 1, 2028. |
| Working Families Tax Credit | Broadens eligibility. |
| Small-business B&O relief | Increases relief and raises the B&O return-filing threshold. |
| Sales and use tax changes | Exempts diapers, over-the-counter drugs, and grooming and hygiene products. |
The statute’s findings also describe an internal linkage: if the income-tax section is repealed or invalidated, certain sales and use taxes would be reinstated and specified credits enacted in the same act would be repealed. That is the legislature’s stated relationship within the package; it does not by itself resolve every possible legal consequence.
Free tools Windows power users keep installed
One-click scans. No signup required.
Where the “wealthy exodus” claim comes from
Opponents have argued that high-income residents will move out, reducing investment, jobs, and tax revenue. News coverage has described that argument in connection with repeal efforts and legal challenges. It establishes that an exodus is a central political concern—not that one has occurred.
What is known
- The rate is 9.9% and the scheduled start date is January 1, 2028.
- The legislative findings target households with at least $1 million in annual adjusted gross income and estimate that roughly 0.5% of households would be affected.
- The enacted tax is imposed on income, not net worth.
- No primary migration study has measured a causal effect of this enacted tax.
What is not established
There is no credible, directly relevant estimate currently showing how many residents will leave, how much revenue would be lost through migration, or what the net effect on Washington’s economy will be. Anecdotes, campaign claims, and forecasts should not be presented as measured outcomes. It is equally unsupported to say that an exodus is inevitable or that the concern has been disproved.
Rank #3
How to evaluate claims about migration
| Claim type | How to read it |
|---|---|
| Statutory text | Shows what the law requires, including the rate, tax base, and effective date. |
| Legislative findings | Shows lawmakers’ intended threshold, affected-household estimate, and policy rationale; these are not independent measurements. |
| Forecast | A projection that depends on assumptions about taxpayer behavior and enforcement. |
| Anecdote or campaign statement | Illustrates a position in the debate but cannot establish the size or cause of migration. |
| Measured causal study | The strongest evidence, but no study specific to this enacted tax has been published. |
Political and legal status
Washington’s official voter-information page lists initiatives seeking to repeal or change the tax. The measures shown on that page were in signature-collection status, and that status can change. Readers should check the page for the latest filing, qualification, or ballot information.
News reporting says the Washington Supreme Court blocked the referendum route against the law, leaving opponents to pursue a citizen initiative. That ruling addressed access to the referendum process; it did not decide separate constitutional challenges on the merits. The tax therefore has a scheduled start date but a politically and legally unsettled future.
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesWhat the law means for a high-income household
- Residence matters: the measure concerns Washington taxable income of individuals, not a nationwide tax on every dollar earned anywhere.
- The threshold needs careful reading: the $1 million household adjusted-gross-income description comes from legislative findings, while liability is calculated under the statutory Washington-taxable-income formula.
- Timing matters: the tax is scheduled for 2028, so relocation decisions made before then could be influenced by expectations, but those expectations are not evidence of a realized response.
- The package matters: affected households and businesses may also encounter the credit expansions, B&O changes, and sales-tax exemptions enacted alongside the income tax.
What to watch before 2028
- Whether repeal or modification initiatives qualify for the ballot and what language they contain.
- Rulings on any constitutional challenges, which are separate from the referendum decision.
- Administrative guidance defining Washington taxable income and filing procedures as implementation approaches.
- Independent studies comparing high-income moves, taxable-income receipts, and economic activity before and after the effective date.
- Budget documents showing actual collections and spending rather than campaign projections.
The Bottom Line
Washington’s 9.9% individual income tax could influence some relocation decisions, but the available evidence does not show a tax-caused wealthy exodus. Because the law starts in 2028 and remains subject to political and legal challenges, the responsible conclusion is uncertainty—not certainty that affluent residents will leave or stay.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
