And there was that standardized sales tax system that the states were going to adopt but only ~15 did if I recall correctly. I can't remember the name but I do

And there was that standardized sales tax system that the states were going to adopt but only ~15 did if I recall correctly. I can't remember the name but I do remember that each state then added their own idiosyncrasies to the "standard" and they inserted incorrect data we had to catch. Or the 100s of thousands of literal exceptions such as "windows 98 physically shipped to a customer once in California on CD so you need to calculate the tax on it as a physical good forever, even when it's sold and received over the internet"