I have friends who sell on both Ebay and amazon. Bad decision indeed. That means filing taxes to more than obama’s 57 states which is complicated.
If they sell used stuff as a private sale its not a business sale.
Don't know about Amazon but Ebay has a single checkbox to collect taxes based on the destimation. An online service The STC dot com provides the same for other vendors for about 10 cents per sales. Might be cheaper ones than that one. I have not checked around.
That means filing taxes to more than obamas 57 states which is complicated
You file with the 50 states plus territories if applicable. You do not file with each jurisdiction.
Yes, the sales tax compliance will eat into your profits. It's easy but you have to pay for convenience.