That isn’t going to make your margins jumpFirst, to see an immediate jump in margins you need to register your biz as a reseller. Then, you buy "wholesale", sales tax free. Tax is "passed on" to customer. All I can say as an Accountant. Lots of valuable info in other responses to your question.
Tax is tax
It’s semi irrelevant where you pay the tax..................
Slow down buddy. Re-read "passed on". Simple concept. Or, need further clarification?