Mastercard and Visa's combined 2017 U.S. corporate T&E purchase volume totaled $51.36 billion, up 9.6 percent from 2016, according to July's Nilson Report, which excludes American Express and Discover products. Mastercard's 2017 U.S. corporate T&E purchase volume increased 11.3 percent to $26.6 billion. Visa reported a 7.7 percent year-over-year increase to $24.8 billion.