Examples of use of keep the change!
1. He gave her $20 and told her to keep the change. And suddenly I saw her lips begin to tremble and tears begin to flow down her cheeks.
2. When a customer who has signed up for the "Keep the change" program buys something with their BofA debit card, the total bill will be rounded up to the nearest dollar and the difference between the bill and that figure would be deposited into a savings account.