In a world where financial security is king, the Bureau of Engraving, the Secret Service ... and ATMs in the U.S. from accepting dollar bills that don't meet certain standards.

Also, find out why you might want to have some $100 bills on hand. Fifty-dollar bills are the perfect size for covering certain regular, mid-sized expenses without the bulk of smaller denominations.

Secret Service, and the ACD Steering Committee have introduced a new initiative to prevent U.S. retailers, banks, and ATMs from accepting “mutilated” banknotes. This includes dollar bills that ...