Washington DOR Amends Rules on Taxation of Medical Substances, Devices

The Washington Department of Revenue (DOR) adopted amendments to WAC 458-20-18801 regarding the taxation of medical substances, devices, and supplies for humans. The amendments reflect changes from SSB 5431 modifying requirements for stating and collecting sales tax on qualifying sales from medical supply vendors. The amendments took effect Feb. 2. [Wash. Dep’t of Revenue, Reg. WAC 458-20-18801, 02/04/26]