There are between 7,500 and 15,000 different sales tax jurisdictions in the United States, based variously on overlapping municipalities, school districts, metr

There are between 7,500 and 15,000 different sales tax jurisdictions in the United States, based variously on overlapping municipalities, school districts, metropolitan transit areas, etc. If one stipulates the necessity of paying out-of-state sales tax, the complexity of the situation makes it next to impossible to comply. Neighboring houses in the same city may have different sales tax rates. There are firms that specialize in just this, but even those can't achieve 100% accuracy.