If you wish to add a discount to an invoice that includes sales tax, you must create a credit and then apply the credit to the invoice.

1. Click Yes to create the credit
2. Enter the desired credit amount
3. Select the fee item from the Assigned Fee item list to be used for the credit. The best practice is to choose the item for which you are issuing the credit
4. If the member has multiple open invoices, select the invoice to which you wish to apply the credit
5. Click Save.
6. Click Close.

The credit has now been applied to the invoice. For further information on credits see Process Credits.