Locate and double-click the supplier's name in the list to open their record.
Click the Options tab.
In the Early Payment Terms section, enter:
the
discount rate
the number of
days within which an invoice must be paid to receive the discount
the number of
days within which the full amount of an invoice must be paid
(Optional) If you want Sage Simply Accounting to calculate the discount without including the sales tax,
select the Calculate Discounts Before Tax
check box.