When you pay the government the sales tax that you've collected, you'll want to track that in AthletaDesk. You'll add this remittance from the "Expenses & Other Revenue" page as a special type of expense.

Use the "Sales Tax Remittance" button that appears at the top of the page. This is a special type of expense that credits your sales tax owing account. This information will be later used by AthletaDesk the next time you run a Sales Tax Report.