Deborah, my impression is that you'd need to get some sort of temporary tax certificate from the state in which you'd be selling and then report your sales to them. I have heard that state tax inspectors sometimes check venues like craft and art fairs to see whether everyone has his legal documents in line and is prepared to pay sales tax to the proper entity. Sales tax is owed to the state in which the article is sold; it's a cost of doing business there. I'm not sure how you'd deal with that sale once you got back to your home state, since you're probably already taking advantage of your professional status to buy supplies tax-free there.
Anyway, Michele is right: it's best to check with an accountant. You can always write it off!
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