Customer Credit

If you want to create a credit for your customer, you can create an invoice with a negative value. This works for invoices that do not involve inventory items.

To create a negative value invoice, create an new invoice and in the items section, choose an item that you want to credit the customer back for and then in the quantity field choose 1 and then in the amount field, enter a negative before the amount. The total amount at the bottom of the invoice will be negative and when you save the invoice, a credit will be created that you can apply to a past or future invoice.