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An exitfare machine is among the equipment located at the elevator exit for the Tenleytown-AU station of the Washington Metro.

An exit fare is a method of collecting ridership fees, or fare, from a transportation system where the fee (or part of the fee) is collected from passengers upon reaching their destination.

Exit fares were used on the subway lines of the early MBTA in Boston as a cost-cutting method to be able to collect increased fares without having to upgrade fare collection equipment at station entrances. The perceived unfairness of this system (what do you do with a passenger if they can't pay the exit fare?) prompted Boston politician Walter A. O'Brien to create the protest song Charlie on the M.T.A..

In New York City, this system is used on the AirTrain at John F. Kennedy International Airport. The system uses an exit fare to distinguish between intra-airport trips, which are free, and connections to the subway and commuter rail, which are not.

In Boston, the last of the exit fares were eliminated on Dec. 4th, 2006 with the implemention of the CharlieCard.

On the Washington Metro, riders process their farecards for both entering and exiting the system. The fare is actually deducted from the rider's card upon exiting the system based on the time of day and distance traveled. Exitfare machines located near the faregates allow riders to add additional value to their farecard should their card lack sufficient value to exit the station at that location. Exitfare machines do not accept SmarTrip. The same is true on Bay Area Rapid Transit where magnetic stripe farecards must have correct value to exit, but TransLink RFID cards do not.

Metro Transit in King County, Washington uses exit fares to implement a free ride zone in downtown Seattle. Riders going toward downtown (and on routes that do not enter downtown) pay on entry. Riders leaving downtown pay on exit. Riders traveling entirely within downtown do not pay at all. (Riders who ride through downtown need to get a free transfer to avoid being double-charged.) After 7 p.m., no free rides are provided downtown and all trips are charged a fare. The Port Authority of Allegheny County in Pittsburgh, Pennsylvania has a similar system.

Many lower-volume point-to-point ticket-based transit services use exit fares in one direction, to avoid the expense of maintaining ticket offices at both ends of the line.

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