This bill, titled the "Small Business Transportation Investment Act of 2025," mandates the Administrator of General Services to establish a three-year pilot program. This program will enable covered small businesses that provide ground transportation services to purchase motor vehicles through the GSA's Federal supply schedules at cost, accessing the same selection pool as other eligible government entities. Each participating small business will be limited to purchasing no more than 50 vehicles per fiscal year. To participate, small businesses must agree to specific terms, including using each purchased motor vehicle for ground transportation service for a minimum of two years. If a vehicle is sold before this two-year period, the business must reimburse the GSA for the difference between the open market value and the purchase price. Additionally, participants are required to donate one out of every five vehicles purchased through the program to a local nonprofit organization once the vehicle is no longer used for ground transportation service. The Administrator is also directed to submit annual reports to Congress detailing participation data, reported cost savings, operational improvements, and environmental impacts, including reductions in vehicle emissions. A final report will assess the program's effectiveness and recommend whether to make it permanent or expand its scope before the pilot program sunsets after three years.