I remember in France they told me that if I purchased perfume, that I could get my TAX money back if I showed them I was a foreigner and at the airport, show that it was merchandise going out of the country. I lost about $300, they supposedly was going to credit my credit card of the taxes on perfumes I got stuck with. France is a TAX, TAX, TAX country.
As a foreigner, you are able to buy certain products duty free in France. Yes, you are reimbursed and it is easy to do.
I do not think it is what is being discussed here.
We are talking about the tax on your income and your business gross.