IRS Notice 2026-53 Clarifies Section 45Z Tax Credit Access for Biogas

The Internal Revenue Service (IRS) has issued Notice 2026-53, providing clearer guidelines for biogas and manure-derived fuel projects seeking the Section 45Z Clean Fuel Production Credit. This notice, effective September 8, 2026, establishes the emissions-rate table for 2026 and specifically includes pathways for dairy and swine manure. This development offers a more defined route for producers to access this important tax credit.

Understanding Section 45Z and the New Guidance

Section 45Z of the tax code aims to incentivize the production of clean fuels. The recent IRS notice is particularly significant because it addresses how emissions are calculated for fuels derived from animal manure. Previously, accessing these credits could be complex, especially for projects utilizing farm-specific manure management practices. Notice 2026-53 aims to simplify this process by allowing producers to use farm-level records to determine their emissions rates.

This means that the specific types of animals and the manure management methods used on a farm before fuel production began can now be factored into the emissions calculation. This provision is designed to accurately reflect the environmental impact of different farming operations. The guidance applies to projects that convert animal manure into fuel through anaerobic digestion.

Farm-Level Records Shape Emissions Calculations

A key aspect of Notice 2026-53 is the ability for taxpayers to establish a distinct emissions rate by detailing the number of animals by type and the proportion of manure managed under various prior practices. This historical data is crucial, as it must reflect the farm’s practices immediately before the digester started operating or before September 8, 2026, whichever comes first. This rule ensures that the calculation is based on the actual conditions at the farm prior to the fuel production process.

For farms that send their manure to an off-site anaerobic digester, a different commencement date applies. In these cases, the relevant date is when the farm first began diverting manure to any off-site anaerobic digester. The notice also acknowledges regenerative agricultural practices, allowing producers to include these methods in their emissions calculations. This recognition supports farmers who are employing advanced, environmentally friendly farming techniques.

Connecting Farm and Fuel Producers to the Biofuel Market

The IRS stated that this guidance is intended to help America’s crop and livestock farmers, ranchers, and fuel producers gain better access to the domestic biofuels market. By linking farm records directly to emissions calculations, the notice integrates agricultural activity with biofuel production. This approach aligns with a broader focus on supporting domestic agriculture and renewable energy.

The guidance specifically includes defined pathways for dairy and swine manure in the 2026 emissions-rate table. However, it is important to note that not all manure-based feedstocks are immediately listed with the same treatment. This means that producers using other types of manure may need to await further updates or guidance.

Future Additions to the 45ZCF-GREET Model

The U.S. Treasury and the IRS have indicated that the 45ZCF-GREET model, which is used for these calculations, is expected to be updated later in 2026. This future revision is planned to include poultry manure and beef manure as primary feedstocks. Additionally, pathway refinements are anticipated.

Until these updates are released, the current notice provides the 2026 emissions rates for the pathways it recognizes. This creates a situation where some projects can proceed using the existing framework, while others that rely on feedstocks not yet added to the model must plan for the upcoming changes. The special manure-treatment rules in this notice are tied to projects and farms that were in existence by September 8, 2026. Operations that begin later may not receive the same farm-specific treatment until further guidance is issued.

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