Two are quickbooks and freshbooks. You really should study accounting if you've never seen discounts tied to the date paid. Cash flow is important to every business, and a lot of businesses do give discounts for quick payment.
Agree completely. I just asking about the software end. I've used freshbooks a lot and I've never seen that option. Just checked again, and it doesn't appear to be there. There are discounts, but it's a discount that is applied immediately, at the time of invoicing, rather than being applied IF certain conditions are met.
http://www.freshbooks.com/blog/the-best-invoice-payment-term...
https://www.americanexpress.com/us/small-business/openforum/...
Being able to define your payment terms is important.