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Washington's Millionaire Tax Faces Lawsuit and Referendum Challenge

4/10/2026

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Summary

Story summary

Opponents of Washington's 9.9% tax on income over $1 million filed a lawsuit claiming it violates constitutional precedents.
The lawsuit is led by Rob McKenna, former Washington Attorney General, arguing income is property and must be taxed uniformly.
The case is expected to reach the state Supreme Court early next year.
Separately, a referendum challenge could repeal the tax this fall, requiring 154,000 signatures by June 10 if viable.

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Story summary

Opponents of Washington's 9.9% tax on income over $1 million filed a lawsuit claiming it violates constitutional precedents.
The lawsuit is led by Rob McKenna, former Washington Attorney General, arguing income is property and must be taxed uniformly.
The case is expected to reach the state Supreme Court early next year.
Separately, a referendum challenge could repeal the tax this fall, requiring 154,000 signatures by June 10 if viable.