Washington's 9.9% income tax takes effect January 1, 2028. This is your complete guide — from who owes it to how to plan for it — with links to 50+ detailed articles on every aspect of the new tax.
Washington's new 9.9% income tax takes effect January 1, 2028. For startup employees and founders with stock options, 2027 is the last full year to exercise without state income tax.
Your tax outcome in Washington depends on how you structure your equity, entity, and exit. This post walks through the planning levers founders, investors, and high earners can pull before 2028.
If you excluded gain under Section 1202 QSBS, does Washington's new millionaire tax still apply? Here's how the new income tax interacts with the federal QSBS exclusion.
The legal journey from Seattle's failed 2017 income tax to Washington's ESSB 6346 statewide income tax runs through constitutional law and the landmark Quinn v. State decision.
