Kirk Williams shared that Washington State is set to begin taxing digital advertising for WA-based businesses on January 1, 2026.
While chatter has been quiet, recent client communication suggests implementation is still moving ahead as planned.

There may be an exemption when campaigns target non-WA audiences, but the details aren’t fully clear yet. Definitely one to investigate with your tax or legal team.
Navah Hopkins clarified in the same post that this requirement comes from Washington state regulations, not Microsoft Advertising itself.