Every Gloriads blog article tagged Sales tax.

US Amazon sellers pay no VAT on Amazon ads. Only Washington adds sales tax, 7.6% to 10.7%, never reclaimable. A legal certificate cuts it to your WA share.

US KDP authors pay no VAT on Amazon ads. Only Washington adds sales tax, 7.6% to 10.7%, and it is not reclaimable. A legal way to pay it on far less.

US Merch on Demand designers pay no VAT on Amazon ads. Only Washington adds sales tax, 7.6% to 10.7%, not reclaimable. A legal way to pay it on far less.
Gloriads runs your Amazon Ads by rules you control, on all four ad types.