Notice 2024-49 provides guidance on the registration requirements for the clean fuel production credit. A taxpayer must be registered as a producer of clean fuel at the time of production to be eligible to claim the clean fuel production credit. It provides guidance regarding the registration requirement, including information about the time, form, and manner of such registration with the Internal Revenue Service. A taxpayer must have a signed registration letter dated on or before January 1, 2025, for the taxpayer to be eligible to claim the clean