Notice 2024-74 provides additional guidance to taxpayers using the safe harbors in Notice 2024-37 with respect to the sustainable aviation fuel (SAF) credit. Notice 2024-74 provides that a taxpayer using a 40BSAF-GREET 2024 safe harbor to calculate its emissions reduction percentage with respect to claims that relate to the sale or use of a SAF qualified mixture after the effective date of the notice must use the newly released October 2024 version of the 40BSAF-GREET 2024 model. 

Notice 2024-74 will be in IRB:  2024-45, dated 11/04/2024.