If you fetch a quick quesadilla or hot dog in Mexico, expect to pay more very soon. Beginning July 1, the 16 percent value-added tax (VAT) will be added to popular prepared foods sold in supermarkets and convenience stores. The new federal tax will cover a variety of foods consumed by busy Mexicans who find less and less time to cook at home, including tortas, tamales, sandwiches, flautas, tacos, hot dogs, roasted chickens, and much more.