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Treasury, IRS propose rules on commercial clean vehicles, issue guidance on clean fuels

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The Treasury Department and the Internal Revenue Service proposed new rules for the tax credit for qualified commercial clean vehicles, along with guidance on claiming tax credits for clean fuel under the Inflation Reduction Act.

The Notice of Proposed Rulemaking on the credit for qualified commercial clean vehicles (under Section 45W of the Tax Code) says the credit can be claimed by purchasing and placing in service qualified commercial clean vehicles, including certain battery electric vehicles, plug-in hybrid EVs, fuel cell electric vehicles and plug-in hybrid fuel cell electric vehicles.  

The credit is the lesser amount of either 30% of the vehicle’s basis (15% for plug-in hybrid EVs) or the vehicle’s incremental cost in excess of a vehicle comparable in size or use powered solely by gasoline or diesel. A credit up to $7,500 can be claimed for a single qualified commercial clean vehicle for cars and light-duty trucks (with a Gross Vehicle Weight Rating of less than 14,000 pounds), or otherwise $40,000 for vehicles like electric buses and semi-trucks (with a GVWR equal to or greater than 14,000 pounds).

“The release of Treasury’s proposed rules for the commercial clean vehicle credit marks an important step forward in the Biden-Harris Administration’s work to lower transportation costs and strengthen U.S. energy security,” said U.S. Deputy Secretary of the Treasury Wally Adeyemo in a statement Friday. “Today’s guidance will provide the clarity and certainty needed to grow investment in clean vehicle manufacturing.”

The NPRM issued today proposes rules to implement the 45W credit, including proposing various pathways for taxpayers to determine the incremental cost of a qualifying commercial clean vehicle for purposes of calculating the amount of 45W credit. For example, the NPRM proposes that taxpayers can continue to use the incremental cost safe harbors such as those set out in Notice 2023-9 and Notice 2024-5, may rely on a manufacturer’s written cost determination to determine the incremental cost of a qualifying commercial clean vehicle, or may calculate the incremental cost of a qualifying clean vehicle versus an internal combustion engine (ICE) vehicle based on the differing costs of the vehicle powertrains.

The NPRM also proposes rules regarding the types of vehicles that qualify for the credit and aligns certain definitional concepts with those applicable to the 30D and 25E credits. In addition, the NPRM proposes that vehicles are only eligible if they are used 100% for trade or business, excepting de minimis personal use, and that the 45W credit is disallowed for qualified commercial clean vehicles that were previously allowed a clean vehicle credit under 30D or 45W. 

The notice asks for comments over the next 60 days on the proposed regulations such as issues related to off-road mobile machinery, including approaches that might be adopted in applying the definition of mobile machinery to off-road vehicles and whether to create a product identification number system for such machinery in order to comply with statutory requirements. A public hearing is scheduled for April 28, 2025.

Clean Fuels Production Credit

The Treasury the IRS also released guidance Friday on the Clean Fuels Production Credit under Section 45Z of the Tax Code.

Section 45Z provides a tax credit for the production of transportation fuels with lifecycle greenhouse gas emissions below certain levels. The credit is in effect in 2025 and is for sustainable aviation fuel and non-SAF transportation fuels.

The guidance includes both a notice of intent to propose regulations on the Section 45Z credit and a notice providing the annual emissions rate table for Section 45Z, which refers taxpayers to the appropriate methodologies for determining the lifecycle GHG emissions of their fuel. In conjunction with the guidance released Friday, the Department of Energy plans to release the 45ZCF-GREET model for use in determining emissions rates for 45Z in the coming days.

“This guidance will help put America on the cutting-edge of future innovation in aviation and renewable fuel while also lowering transportation costs for consumers,” said Adeyemo in a statement. “Decarbonizing transportation and lowering costs is a win-win for America.”

Section 45Z provides a per-gallon (or gallon-equivalent) tax credit for producers of clean transportation fuels based on the carbon intensity of production. It consolidates and replaces pre-Inflation Reduction Act credits for biodiesel, renewable diesel, and alternative fuels, and an IRA credit for sustainable aviation fuel. Like several other IRA credits, Section 45Z requires the Treasury to establish rules for measuring carbon intensity of production, based on the Clean Air Act’s definition of “lifecycle greenhouse gas emissions.”

The guidance offers more clarity on various issues, including which entities and fuels are eligible for the credit, and how taxpayers determine lifecycle emissions. Specifically, the guidance outlines the Treasury and the IRS’s intent to define key concepts and provide certain rules in a future rulemaking, including clarifying who is eligible for a credit.

The Treasury and the IRS intend to provide that the producer of the eligible clean fuel is eligible to claim the 45Z credit. In keeping with the statute, compressors and blenders of fuel would not be eligible.

Under Section 45Z, a fuel must be “suitable for use” as a transportation fuel. The Treasury and the IRS intend to propose that 45Z-creditable transportation fuel must itself (or when blended into a fuel mixture) have either practical or commercial fitness for use as a fuel in a highway vehicle or aircraft. The guidance clarifies that marine fuels that are otherwise suitable for use in highway vehicles or aircraft, such as marine diesel and methanol, are also 45Z eligible.

Specifically, this would mean that neat SAF that is blended into a fuel mixture that has practical or commercial fitness for use as a fuel would be creditable. Additionally, natural gas alternatives such as renewable natural gas would be suitable for use if produced in a manner such that if it were further compressed it could be used as a transportation fuel.

Today’s guidance publishes the annual emissions rate table that directs taxpayers to the appropriate methodologies for calculating carbon intensities for types and categories of 45Z-eligible fuels.

The table directs taxpayers to use the 45ZCF-GREET model to determine the emissions rate of non-SAF transportation fuel, and either the 45ZCF-GREET model or methodologies from the International Civil Aviation Organization (“CORSIA Default” or “CORSIA Actual”) for SAF.

Taxpayers can use the Provisional Emissions Rate process to obtain an emissions rate for fuel pathway and feedstock combinations not specified in the emissions rate table when guidance is published for the PER process. Guidance for the PER process is expected at a later date.

Outlining climate smart agriculture practices

The guidance released Friday states that the Treasury intends to propose rules for incorporating the emissions benefits from climate-smart agriculture (CSA) practices for cultivating domestic corn, soybeans, and sorghum as feedstocks for SAF and non-SAF transportation fuels. These options would be available to taxpayers after Treasury and the IRS propose regulations for the section 45Z credit, including rules for CSA, and the 45ZCF-GREET model is updated to enable calculation of the lifecycle greenhouse gas emissions rates for CSA crops, taking into account one or more CSA practices.    

CSA practices have multiple benefits, including lower overall GHG emissions associated with biofuels production and increased adoption of farming practices that are associated with other environmental benefits, such as improved water quality and soil health. Agencies across the Federal government have taken important steps to advance the adoption of CSA. In April, Treasury established a first-of-its-kind pilot program to encourage CSA practices within guidance on the section 40B SAF tax credit. Treasury has received and continues to consider substantial feedback from stakeholders on that pilot program. The U.S. Department of Agriculture invested more than $3 billion in 135 Partnerships for Climate-Smart Commodities projects. Combined with the historic investment of $19.5 billion in CSA from the Inflation Reduction Act, the department is estimated to support CSA implementation on over 225 million acres in the next 5 years as well as measurement, monitoring, reporting, and verification to better understand the climate impacts of these practices.

In addition, in June, the U.S. Department of Agriculture published a Request for Information requesting public input on procedures for reporting and verification of CSA practices and measurement of related emissions benefits, and received substantial input from a wide array of stakeholders. The USDA is currently developing voluntary technical guidelines for CSA reporting and verification. The Treasury and the IRS expect to consider those guidelines in proposing rules recognizing the benefits of CSA for purposes of the Section 45Z credit.

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IAASB tweaks standards on working with outside experts

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The International Auditing and Assurance Standards Board is proposing to tailor some of its standards to align with recent additions to the International Ethics Standards Board for Accountants’ International Code of Ethics for Professional Accountants when it comes to using the work of an external expert.

The proposed narrow-scope amendments involve minor changes to several IAASB standards:

  • ISA 620, Using the Work of an Auditor’s Expert;
  • ISRE 2400 (Revised), Engagements to Review Historical Financial Statements;
  • ISAE 3000 (Revised), Assurance Engagements Other than Audits or Reviews of Historical Financial Information;
  • ISRS 4400 (Revised), Agreed-upon Procedures Engagements.

The IAASB is asking for comments via a digital response template that can be found on the IAASB website by July 24, 2025.

In December 2023, the IESBA approved an exposure draft for proposed revisions to the IESBA’s Code of Ethics related to using the work of an external expert. The proposals included three new sections to the Code of Ethics, including provisions for professional accountants in public practice; professional accountants in business and sustainability assurance practitioners. The IESBA approved the provisions on using the work of an external expert at its December 2024 meeting, establishing an ethical framework to guide accountants and sustainability assurance practitioners in evaluating whether an external expert has the necessary competence, capabilities and objectivity to use their work, as well as provisions on applying the Ethics Code’s conceptual framework when using the work of an outside expert.  

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Tariffs will hit low-income Americans harder than richest, report says

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President Donald Trump’s tariffs would effectively cause a tax increase for low-income families that is more than three times higher than what wealthier Americans would pay, according to an analysis from the Institute on Taxation and Economic Policy.

The report from the progressive think tank outlined the outcomes for Americans of all backgrounds if the tariffs currently in effect remain in place next year. Those making $28,600 or less would have to spend 6.2% more of their income due to higher prices, while the richest Americans with income of at least $914,900 are expected to spend 1.7% more. Middle-income families making between $55,100 and $94,100 would pay 5% more of their earnings. 

Trump has imposed the steepest U.S. duties in more than a century, including a 145% tariff on many products from China, a 25% rate on most imports from Canada and Mexico, duties on some sectors such as steel and aluminum and a baseline 10% tariff on the rest of the country’s trading partners. He suspended higher, customized tariffs on most countries for 90 days.

Economists have warned that costs from tariff increases would ultimately be passed on to U.S. consumers. And while prices will rise for everyone, lower-income families are expected to lose a larger portion of their budgets because they tend to spend more of their earnings on goods, including food and other necessities, compared to wealthier individuals.

Food prices could rise by 2.6% in the short run due to tariffs, according to an estimate from the Yale Budget Lab. Among all goods impacted, consumers are expected to face the steepest price hikes for clothing at 64%, the report showed. 

The Yale Budget Lab projected that the tariffs would result in a loss of $4,700 a year on average for American households.

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At Schellman, AI reshapes a firm’s staffing needs

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Artificial intelligence is just getting started in the accounting world, but it is already helping firms like technology specialist Schellman do more things with fewer people, allowing the firm to scale back hiring and reduce headcount in certain areas through natural attrition. 

Schellman CEO Avani Desai said there have definitely been some shifts in headcount at the Top 100 Firm, though she stressed it was nothing dramatic, as it mostly reflects natural attrition combined with being more selective with hiring. She said the firm has already made an internal decision to not reduce headcount in force, as that just indicates they didn’t hire properly the first time. 

“It hasn’t been about reducing roles but evolving how we do work, so there wasn’t one specific date where we ‘started’ the reduction. It’s been more case by case. We’ve held back on refilling certain roles when we saw opportunities to streamline, especially with the use of new technologies like AI,” she said. 

One area where the firm has found such opportunities has been in the testing of certain cybersecurity controls, particularly within the SOC framework. The firm examined all the controls it tests on the service side and asked which ones require human judgment or deep expertise. The answer was a lot of them. But for the ones that don’t, AI algorithms have been able to significantly lighten the load. 

“[If] we don’t refill a role, it’s because the need actually has changed, or the process has improved so significantly [that] the workload is lighter or shared across the smarter system. So that’s what’s happening,” said Desai. 

Outside of client services like SOC control testing and reporting, the firm has found efficiencies in administrative functions as well as certain internal operational processes. On the latter point, Desai noted that Schellman’s engineers, including the chief information officer, have been using AI to help develop code, which means they’re not relying as much on outside expertise on the internal service delivery side of things. There are still people in the development process, but their roles are changing: They’re writing less code, and doing more reviewing of code before it gets pushed into production, saving time and creating efficiencies. 

“The best way for me to say this is, to us, this has been intentional. We paused hiring in a few areas where we saw overlaps, where technology was really working,” said Desai.

However, even in an age awash with AI, Schellman acknowledges there are certain jobs that need a human, at least for now. For example, the firm does assessments for the FedRAMP program, which is needed for cloud service providers to contract with certain government agencies. These assessments, even in the most stable of times, can be long and complex engagements, to say nothing of the less predictable nature of the current government. As such, it does not make as much sense to reduce human staff in this area. 

“The way it is right now for us to do FedRAMP engagements, it’s a very manual process. There’s a lot of back and forth between us and a third party, the government, and we don’t see a lot of overall application or technology help… We’re in the federal space and you can imagine, [with] what’s going on right now, there’s a big changing market condition for clients and their pricing pressure,” said Desai. 

As Schellman reduces staff levels in some places, it is increasing them in others. Desai said the firm is actively hiring in certain areas. In particular, it’s adding staff in technical cybersecurity (e.g., penetration testers), the aforementioned FedRAMP engagements, AI assessment (in line with recently becoming an ISO 42001 certification body) and in some client-facing roles like marketing and sales. 

“So, to me, this isn’t about doing more with less … It’s about doing more of the right things with the right people,” said Desai. 

While these moves have resulted in savings, she said that was never really the point, so whatever the firm has saved from staffing efficiencies it has reinvested in its tech stack to build its service line further. When asked for an example, she said the firm would like to focus more on penetration testing by building a SaaS tool for it. While Schellman has a proof of concept developed, she noted it would take a lot of money and time to deploy a full solution — both of which the firm now has more of because of its efficiency moves. 

“What is the ‘why’ behind these decisions? The ‘why’ for us isn’t what I think you traditionally see, which is ‘We need to get profitability high. We need to have less people do more things.’ That’s not what it is like,” said Desai. “I want to be able to focus on quality. And the only way I think I can focus on quality is if my people are not focusing on things that don’t matter … I feel like I’m in a much better place because the smart people that I’ve hired are working on the riskiest and most complicated things.”

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