ADD REPORT FOR SALES TAX COLLECTED
Generate a report that shows the sales tax you collected. When you run "invoices" report, it shows that total amount of sales tax that was charged, not the total amount collected. So if you do net 30, then run a report on for the month, you will have a lot of sales tax that shows in the report, but has not been paid. Also this helps from paying sales tax on uncollected invoices.