Commuter Relief Act - Amends the Internal Revenue Code to: (1) establish a uniform monthly benefit amount of $200 for all types of transportation fringe benefits (commuting reimbursements, transit passes, parking, and bicycle commuting reimbursements) and allow a cost-of-living adjustment for such benefit amount beginning after 2012; (2) make self-employed individuals eligible for transit pass fringe benefits; (3) require certain employers who have an average of 50 employees during the calendar year to offer a parking cash-out program under which an employer offers employees a cash allowance equal to the regular amount paid by the employer for parking; (4) allow a 10% business tax credit for investment in commuter vans with a seating capacity of at least 7, but not more than 15, adults that are placed in service before January 1, 2019; and (5) permit employees to exclude from gross income for income tax purposes transit passes and reimbursements of bicycle commuting expenses in the same month.