Renewable Natural Gas Incentive Act of 2025

This bill creates a new $1.00 per gallon tax credit for renewable natural gas (RNG) used as fuel in vehicles, boats, or aircraft. It directly affects RNG producers (who must register and certify their product) and businesses that buy or use RNG for transportation fuel. Key provisions require producers to register with the IRS, provide specific certification about the fuel's origin and volume, and limit blended RNG treatment to amounts specified in contracts. The credit expires after December 31, 2035, and applies only to RNG produced and used within the United States.