Renewable Natural Gas Incentive Act of 2025

Creates a new tax credit of $1.00 per gallon (or gasoline-gallon-equivalent) for renewable natural gas (RNG) when sold or used as fuel for on‑road vehicles, boats, or aircraft. The credit defines qualifying RNG, sets rules for blended RNG and required producer certifications, establishes a payment mechanism for sellers or users, and sunsets for fuel sold or used after December 31, 2035. The change amends the Internal Revenue Code and applies to calendar quarters beginning after enactment.