Proposed Regulations on Clean Fuel Production Credit (IRC Section 45Z) Explained with Key Updates and Clarifications

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February 20th, 2026
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9:00 AM

Proposed regulations under IRC Section 45Z offer crucial updates on qualified sales, blending activities, and producer determination, reshaping the clean fuel industry and necessitating expert guidance for compliance and optimization strategies.

In a significant move to enhance clarity and guidance within the clean fuel industry, the Treasury Department and the IRS have unveiled proposed regulations that delve deep into the Clean Fuel Production Credit under IRC section 45Z. These regulations, building upon last year's framework preview, bring forth vital insights on sales, production, and eligibility criteria. Notable updates include expanded definitions on qualified sales, clarifications on blending activities, and a refined approach to determining producers in the realm of renewable natural gas. These proposed rules aim to streamline processes and provide a robust framework for stakeholders navigating the evolving landscape of clean transportation fuels.

Expanded Definitions on Qualified Sales

The proposed regulations under IRC section 45Z bring significant changes to the definition of qualified sales for clean transportation fuels. Notably, the earlier draft language in Notice 2025-10 raised concerns among industry stakeholders regarding the narrow interpretation of qualified sales. However, the proposed rules aim to address these concerns by introducing a more inclusive approach. For instance, the regulations now allow sales to wholesalers and resellers to qualify, eliminating the previous restriction that fuel must be sold for use specifically as a fuel in a trade or business. This adjustment is expected to facilitate compliance for producers operating through various distribution channels, including dealers and marketers. Moreover, the introduction of a look-through rule enables sales made through related intermediaries to be counted as sales to unrelated persons, providing more flexibility in meeting the statutory sale requirement.

In this evolving landscape, companies like Baker Tilly play a crucial role in helping stakeholders navigate the complexities of these regulatory changes. By closely monitoring developments and evaluating the operational impacts, firms like Baker Tilly can offer valuable insights and guidance to fuel producers, developers, and investors. As the industry adapts to these expanded definitions on qualified sales, expert advice becomes increasingly essential to ensure compliance and optimize opportunities within the clean fuel sector.

Clarifications on Blending Activities

Another key aspect addressed in the proposed regulations is the clarification on blending activities concerning clean transportation fuels. While blending activities themselves do not constitute production under section 45Z, the regulations emphasize that producers do not lose credit eligibility if qualifying fuels are blended with fossil fuels or other components before sale. This distinction is crucial as it ensures that producers are not penalized for post-production handling steps such as blending. By recognizing that blending is a separate activity from production, the regulations provide clarity on the eligibility criteria for claiming the Clean Fuel Production Credit.

Companies like Baker Tilly can offer valuable expertise in navigating the nuances of blending activities within the clean fuel industry. As producers seek to optimize their credit eligibility while adhering to regulatory requirements, consulting firms like Baker Tilly can provide tailored guidance on blending practices and compliance strategies. With a deep understanding of the regulatory landscape, these firms can assist stakeholders in maximizing the benefits of the proposed clarifications on blending activities, ensuring efficient and compliant operations in the production of clean transportation fuels.

Refined Approach to Determining Producers in RNG Processing

The proposed regulations also provide clarity on determining the producer of renewable natural gas (RNG) for purposes of section 45Z. By specifying that the entity performing the substantive upgrading of raw biogas is considered the producer, the regulations establish a clear framework for attributing the Clean Fuel Production Credit. This approach ensures that the credit is attached to the party responsible for transforming raw biogas into a clean fuel that meets quality specifications, even if downstream compression activities are conducted by other entities. By delineating the roles within RNG processing, the regulations aim to streamline credit attribution and enhance transparency in the RNG production chain.

For companies involved in RNG processing, such as Baker Tilly, understanding the nuances of producer determination is essential in optimizing credit eligibility and compliance. With expertise in clean energy tax credits and regulatory frameworks, firms like Baker Tilly can assist RNG producers in navigating the regulatory landscape and maximizing the benefits of the refined approach outlined in the proposed regulations. By leveraging industry insights and technical knowledge, these companies can help stakeholders in the RNG sector align their operations with the regulatory requirements and capitalize on the opportunities presented by the new guidelines.

Conclusion

As the clean fuel industry embraces the proposed regulations reshaping the landscape of clean transportation fuels, clarity and adaptability become paramount. With expanded definitions on qualified sales, clarifications on blending activities, and a refined approach to determining producers, stakeholders must leverage expert guidance from firms like Baker Tilly to navigate compliance intricacies and optimize opportunities. Embracing these regulatory changes not only ensures operational efficiency but also underscores a commitment to sustainability, ethical sourcing, and transparency across global supply chains. In this era of transformation, strategic partnerships and informed decision-making will drive success in the evolving realm of clean energy production.