The total cost of the manufactured products going into a solar project is $100. The project procures $40 worth of manufactured products from a PFE.
MACR = ((100-40)/100) X 100% = 60%
The project has a MACR of 60%. If this project seeks to claim the 45X tax credit in 2026, it would not be disqualified on the basis of its MCR, since the MACR threshold is set at 50% for solar components in 2026. If this project seeks to claim the 45X credit in 2028, however, it would be disqualified on the basis of its MACR, since the MACR threshold is set at 70% for solar components in 2028.
The material assistance provision also includes safe harbor rules, certification requirements and existing contract exceptions. The bill directs the IRS and Department of Energy to publish “safe harbor tables” by Dec. 31, 2026, that “identify the percentage of the total direct material costs of any manufactured product or eligible component which is attributable to a foreign entity.” In the time period before safe harbor tables are published, the taxpayer aiming to claim any of the applicable credits may use either the safe harbor tables updated in IRS Notice 2025-08 or issue a certification requirement that verifies the material assistance cost ratio calculation. The IRS must publish the safe harbor tables no later than Dec. 31, 2026.
Certification requirements are used to verify that components supplied to the taxpayer were not produced by a PFE. Suppliers who issue false or misleading certifications face fines from the IRS. The bill also exempts existing contracts from the material assistance restrictions. This allows taxpayers who acquire a component from a supplier based on a contract finalized before June 16, 2025, to exempt those components from their material assistance cost ratio calculations as long as the component is then placed into service (or sold) before Jan. 1, 2030.
These FEOC rules would create an environment in which there are increased IRS enforcement risks relating to energy credits. For instance, OBBBA establishes an extended FEOC audit period. In most circumstances, the IRS has three years from the date a return is due or filed (whichever comes later) to complete an audit and assess any associated tax liability. The OBBBA now allows six years where there is a deficiency (understatement) in tax due to an error in determining whether there was material assistance from a FEOC.
There is also an increased penalty risk. OBBBA allows the IRS to impose a 20% penalty for substantial understatement of tax liability when there is a disallowance of energy credits due to an overstated MACR, if the disallowance creates an understatement of tax equal to 1% of the tax that should have been shown on the return (under previous law, this penalty did not apply unless there was a misstatement of $10,000,000 or 10% of the tax that should have been shown on the return).
Further, the supplier certification regime comes with penalty risks for suppliers. Suppliers who deliver certifications regarding FEOCs that turn out to be false, and where the supplier knew or reasonably should have known that the statements as to FEOCs or MACRs were false, can now result in tax penalties to suppliers. If such a misstatement causes the disallowance of an energy credit, the supplier who made the certification can be subject to a penalty equal to up to 10% of the amount (or $100,000, whichever is larger) of any underpayment attributable to the inaccuracy or falsity of the certification. The IRS would also have six years to assess this penalty.
The penalty applies to misstatements on certificates given after Dec. 31, 2025.