Description:The Daily Digit is 4%. Retailers in 40 U.S. states can now charge up to 4% extra when consumers pay for goods and services with a credit card. These so-called "checkout fees" went into effect January 27 and are the result of the biggest anti-trust settlement in U.S. history. In 2005, a group of merchants claimed that MasterCard, Visa, and nine other companies, including JP Morgan Chase, conspired to fix the fees that stores pay to accept credit card purchases.(1:14)