Corporate accounts tend to be a very good deal even for infrequent renters. There are no sign-up fees, and you can save an average of 20% on every car you rent.

In addition to lower rates, corporate accounts can provide other benefits. Many programs offer free upgrade coupons or free rental days to members. Rental firms will also guarantee cars in times of high demand for account holders, meaning a corporate renter will rarely face a situation in which no cars are available.