What transactions count toward my monthly transaction limit?
A transaction is an order (a sale, refund, or return) imported from your website or shopping cart into TaxJar with one or more line items. If you import transactions via CSV, each line in the file is an individual transaction. If you're using SmartCalcs, a transaction is a SmartCalcs API sales tax calculation or pushed order that results in a sale.
If you go over your transaction limit, you will simply be charged the price of the plan that matches your transaction volume for the month when the overage occurred.