There are different ways of giving discount to an invoice.
1. Discount (in %) on article or invoice
You can give discount, while you are creating an invoice. It is possible to give discount on single articles or on the invoice:
It is also possible to add discount in percent
2. Cash discount (in %) if paid in fewer than __ days
You can also set discount in the Default settings. Insert the percentage of discount you will grant if the invoice is paid within a fixed period of time.