There are a number of "Sales tax as a Service" businesses like Avalara out there, which honestly ANY small business that can afford it should partake.
I worked for a company that tried to build an in house sales tax rule calculator, it's damn near impossible unless you want to devote a team of people just to sales tax, and certainly not worth the risk.
I worked for a company that tried to build an in house sales tax rule calculator, it's damn near impossible unless you want to devote a team of people just to sales tax, and certainly not worth the risk.