Other thing is that when you’re VAT registered, as a buyer of parts you reclaim VAT on things you purchase as inputs. So the tax on the final product is what matters.
With US sales taxes you accrue tax all the way up the chain.
What?
Sales tax exemption is a thing when buying items for sale or materials for items for sale.
What?
Sales tax exemption is a thing when buying items for sale or materials for items for sale.