I was offering a quickpay discount of 2% if payment was postmarked within 7 days of the invoice date. I had several brokers take advantage of it, one of them took it even though they mailed their check 11 days after the invoice date. lol. maybe wording is important if you want them to use it. right below the amount due I put the quickpay amount due in red ink with two asteriks and then put the quickpay terms by two asteriks at the bottom.