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Washington Supreme Court Blocks Millionaires Tax Referendum

5/5/2026

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Summary

Story summary

Washington Supreme Court rejected Brian Heywood and Let’s Go Washington’s petition to force a referendum on the millionaires tax, invoking a century-old exemption.
The tax levies 9.9% on income above $1 million, exempts the first million, and begins collection in April 2029.
Brian Heywood said the ruling contradicts decades of precedent that deem the tax unconstitutional.

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Story summary

Washington Supreme Court rejected Brian Heywood and Let’s Go Washington’s petition to force a referendum on the millionaires tax, invoking a century-old exemption.
The tax levies 9.9% on income above $1 million, exempts the first million, and begins collection in April 2029.
Brian Heywood said the ruling contradicts decades of precedent that deem the tax unconstitutional.