Sooooo who pays the difference between the state tax; the state tax plus the county tax; the state tax, plus the county tax, plus the city tax; the state tax, plus the county tax, plus the city tax, plus any special assessments?
Hint, it isn't the state.
For bonus points, guess who gets stuck with the fines, penalties, and interest for any missing or late taxes.
For full credit, guess which court claims jurisdiction and demands your physical presence in their court, tomorrow at 9:00 AM, if you don't drop everything, and bend to their will, you loose everything in a summary judgment.
Your customer does and you collect the money
My statement was simply that the states collect everything and then dole out the amounts you are talking about. You are not filing and submitting to 10,000 jurisdictions. That's a red herring and I was pointing that out
You do the lookups for each transaction for 10 cents per. Then each month or quarter all those lookups are integrated into a report and sent to each of 50 states with the total payment. That's likely to be a more expensive service, and I have not found prices for filing services.