Washington DOR Issues Special Notice on High Grossing Businesses Surcharge

The Washington Department of Revenue (DOR) issued a special notice on the surcharge on high grossing businesses. The notice states that beginning Jan. 1, 2026, businesses with Washington taxable income of $250 million or more in a calendar year are subject to a surcharge in addition to the business and occupation (B&O) tax. Certain amounts are excluded from the surcharge. The rate is 0.5 percent of certain Washington taxable income over $250 million. The surcharge expires Dec. 31, 2029. [Wash. Dep’t of Revenue, Special Notice: Surcharge on High Grossing Businesses, 09/29/25]

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