The following fields are shown in the Sales Tax Due row and are only available when adding new clients.

Fee Sales Tax Due Maximum amount of 99,999,999.99. Enter the total fee sales tax that has been billed and is still unpaid by the client.
Expense Sales Tax Due Maximum amount of 99,999,999.99. Enter the total expense sales tax that has been billed and is still unpaid by the client.
Advance Sales Tax Due Maximum amount of 99,999,999.99. Enter the total advance sales tax that has been billed and is still unpaid by the client.

A popup calculator is available when editing these fields. The "<" and ">" keys can be used to increase or decrease the amount due by one dollar at a time.

The Sales Tax Due row is not shown when viewing clients who have a client ledger record. Instead the Balance Due field is shown.