The House and Senate reconciliation bills both propose major changes to the 45Z Clean Fuel Production Tax Credit, aiming to extend and reshape federal support for biofuels. While both chambers extend the credit through 2031 and relax greenhouse gas (GHG) emission calculations by excluding indirect land-use change, they sharply diverge on rules for feedstock sourcing, credit value and how flexibly the credits can be transferred.
House Reconciliation Bill
- 45Z credit extension: Extends the 45Z credit through Dec. 31, 2031, replacing prior biofuel subsidies like the ethanol tax credit (VEETC) and biomass-based diesel credit.
- 40B credit extension: No provision.
- Feedstock restrictions: After Dec. 31, 2025, fuels must use feedstocks exclusively grown or produced in the U.S., Canada or Mexico to qualify. Foreign feedstocks are banned.
- Emissions calculation: Indirect land-use change emissions are excluded from greenhouse gas (GHG) assessments, making conventional biofuels (e.g., corn ethanol) more likely to qualify.
- Credit value: Offers up to $1.00 per gallon for non-aviation fuel and $1.75 per gallon for aviation fuel if wage/apprenticeship requirements are met.
- Manure-based biogas: Transportation fuels derived from animal manures — including dairy, swine, and poultry waste — are eligible for the 45Z credit. Distinct emissions rates for manure feedstocks. Rather than applying a generic carbon-intensity rate, mandates unique emissions rates for each type of animal manure, increasing accuracy and improving credit certainty.
- Transferability: Repeals transferability for fuel produced after 2027.
- Foreign ownership limits: Significantly broadens definition of a “Prohibited Foreign Entity” (PFE), covering both “Specified Foreign Entities” and “Foreign-Influenced Entities.” Covered entities: Includes Chinese military companies, entities subject to the Uyghur Forced Labor Prevention Act, battery producers ineligible for DOD contracts (e.g., CATL, BYD, Envision, Gotion), and any entity controlled (over 50% ownership or beneficial interest) by China, Russia, North Korea, or Iran. Scope: The bill prevents most IRA energy tax credits from being claimed by companies that are PFEs or that have significant business relationships (licensing, sourcing, payments) with PFEs. Attribution: The House bill applies strict attribution rules, potentially sweeping up public entities and complex ownership structures.
- Cost impact: Estimated to cost $45 billion from 2025–2034, with $8.5 billion in FY 2031 alone. Critics argue this subsidizes mature industries without incentivizing innovation.
Senate Reconciliation Bill
- 45Z credit extension: Extends 45Z through 2031.
- 40B credit extension: Short-term extension of the 40B credit. Specifically, the extension covers biodiesel and renewable diesel produced through Sept. 30, 2025. This extension is designed to provide a bridge for producers as the industry transitions to the 45Z credit.
- Feedstock rules: Allows foreign feedstocks but imposes a 20% reduction in credit value for fuels using non-U.S. feedstocks after Dec. 31, 2025.
- Emissions calculation: Also excludes indirect land-use change emissions.
- Aviation fuel: Retains the SAF premium but removes land-use change accounting.
- Manure-based biogas: Actively encourages biogas from animal waste, like the House bill. It not only qualifies manure-derived fuel but also enforces manure-specific carbon accounting, a policy feature aimed at rewarding genuine GHG reduction through waste-derived energy.
- Transferability: Maintains full transferability for the credit’s duration, unlike the House version.
- Foreign ownership limits: FEOC rules retained, but modified: The Senate bill keeps the House’s framework but makes several clarifications and adjustments to make the rules more administrable for industry. Thresholds and control: The Senate increases the ownership and debt thresholds that trigger restrictions, making it less likely for minor foreign involvement to result in credit denial. Payment rules: Only payments to a foreign entity that result in “effective control” (rather than any payment over a low threshold) can trigger a denial of credits, which is less punitive than the House version. Effective Dates: The Senate bill delays the effective date of these restrictions compared to the House, providing a longer transition period for compliance. Complexity: While more workable, the Senate approach still introduces administrative complexity and the risk of inadvertent credit denials due to nuanced attribution rules.
- Cost structure: No direct cost estimate, but the 20% reduction for foreign feedstocks aims to curb spending while supporting domestic agriculture.
Final legislation will need to bridge these differences. The House is pushing for strict domestic sourcing and large, less-flexible subsidies, while the Senate aims for a more moderate approach that balances support for U.S. agriculture with fiscal restraint and international trade considerations.
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