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County Court invalidates Seattle personal income tax

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On Nov. 22, 2017, the Superior Court of Washington for King County ruled that an income tax enacted in July by Seattle’s City Council violates a state statutory provision which prohibits a city from levying a tax based on net income. As a result, the decision will prevent Seattle from implementing the personal income tax, which otherwise would have been imposed on high-income Seattle residents beginning with the 2018 tax year.