After filing $0/exempt quarterly reports in GA for years, we finally asked for -- and received -- a sales tax exempt status for our small business, which is services-only based with no merchandise sales. Dunno if you could do the same in Texas, but worth the effort imo.My wife's an artist and started doing some pet portrait commissions for fun. Once we found out about the (Texas) sales tax requirements, and reporting needs it went from fun to a huge PITA. She still has to report sales tax every couple months even though the value is zero (she hasn't done one in a year).
She also got Square - makes life so much easier for everyone even though they take a chunk in fees.
Just change your business model to one where a) the customer hires your wife as an independent contractor to paint portraits of their pet, then b) display photos of the portraits on your web site (good advertising), and c) sell non-transferrable rights to copy and print the photos for a nominal fee. Give away the actual portrait for free to those that do.
No sales tax on services -- you're not selling a product. They're paying her to paint and take photos.