“This is nobody’s job – and nobody should be wasting even a second of their time on it,” says Yashwanth Madhusudhan, CEO and co-founder of Fyle, of the work and hassle involved in managing expenses.

New York-based start-up Fyle will today unveil an agreement with American Express that extends its ability to provide small businesses with crucial expenses data. Fyle, which already has similar deals ...