The US Department of the Treasury and Internal Revenue Service (IRS) released guidance on the Sustainable Aviation Fuel (SAF) Credit established by the Inflation Reduction Act (IRA). The Treasury Department worked closely with the Environmental Protection Agency (EPA), Department of Transportation (DOT), Department of Agriculture (USDA), and Department of Energy (DOE) on the Notice.

The Treasury Department’s guidance provides clarity around eligibility for the SAF Credit. The credit incentivizes the production of SAF that achieves a lifecycle greenhouse gas emissions reduction of at least 50% as compared with petroleum-based jet fuel.

Producers of SAF are eligible for a tax credit of $1.25 to $1.75 per gallon. SAF that achieves a GHG emissions reduction of 50% is eligible for the $1.25 credit per gallon amount, and SAF that achieves a GHG emissions reduction of more than 50% is eligible for an additional $0.01 per gallon for each percentage point the reduction exceeds 50%, up to $0.50 per gallon.

As part the guidance, the agencies comprising the SAF Interagency Working Group (IWG) jointly announced the 40B SAF-GREET 2024 model. This model provides another methodology for SAF producers to determine the lifecycle GHG emissions rates of their production for the purposes of the SAF Credit.

The modified version of GREET incorporates new data, including updated modeling of key feedstocks and processes used in aviation fuel and indirect emissions. The modified GREET model also integrates key greenhouse gas emission reduction strategies such as carbon capture and storage, renewable natural gas, and renewable electricity.

The Notice also, on a pilot basis, incorporates a USDA pilot program to encourage the use of certain Climate Smart Agriculture (CSA) practices for SAF feedstocks. Incorporating CSA practices into the production of SAF provides multiple benefits, including lower overall GHG emissions associated with SAF production and increased adoption of farming practices that are associated with other environmental benefits, such as improved water quality and soil health.

For corn ethanol-to-jet, the pilot provides a greenhouse gas reduction credit if a “bundle” of certain CSA practices (no-till, cover crop, and enhanced efficiency fertilizer) are used. It similarly would allow a greenhouse gas reduction credit for soybean-to-jet if the soybean feedstock is produced using a “bundle” of applicable CSA practices (no-till and cover crop). This is a pilot program specific to the 40B credit, which is in effect for 2023 and 2024.

To credit CSA practices in the Clean Fuel Production Credit (45Z), which becomes available in 2025, the agencies will do further work on modeling, data, and assumptions, as well as verification. A new 45Z-GREET will be developed for use with the 45Z tax credit.