What is the flat fee for rental?

When renting vehicles, there are several fees that must be considered. Most rental companies usually charge a flat fee for rental plus additional costs. The flat fee for rental is the fee you pay regardless of whether or not you drive the vehicle. Then on top of that, they charge additional fees which are based on the amount of driving. The flat fee for rental usually works on a daily basis. For example, a car rental company could charge $20 a day for renting a compact car. And then there would be additional costs for each mile driven. The flat fee for rental is basically a fee that has to be paid no matter what.