Determine whether the new construction restriction applies
An owner procuring energy equipment for its operating premises in 2026 needs to evaluate more than the credit percentage and installation date. Restrictions concerning prohibited foreign entities can affect whether the facility or storage technology qualifies at all. Establish the applicable construction facts and sourcing requirements before selecting equipment on a credit-dependent budget.
Notice 2026-15 describes interim guidance following the 2025 legislation. It explains material-assistance restrictions for specified section 48E facilities, interconnection property, and energy storage technology whose construction begins after December 31, 2025. It also addresses taxpayer status and provides conditional safe harbors. The notice anticipates further regulations, so the adviser should identify both the applicable rule and the permitted reliance for the actual project.
Keep the material-assistance analysis separate from the domestic content bonus. One concerns a restriction on eligibility; the other concerns a potential increased credit. Similar supplier documents can be relevant to both, but meeting one test does not establish that the other is satisfied.
Model the ratio using a supported cost population
Consider a hypothetical storage project for which the adviser has established an applicable safe-harbor calculation. Assume the total relevant assigned percentage is 100 and the relevant PFE-produced portion is 30. Subtracting 30 from 100 and dividing by 100 produces a material-assistance cost ratio of 70%. The adviser must compare that result with the actual statutory threshold for the technology and construction year.
Now suppose the final installed project omits a listed component carrying an assumed ten percentage points, and that component was entirely outside the PFE-produced portion. Under an assumed method requiring the omitted component to be disregarded, the relevant total becomes 90 while the PFE portion remains 30. The ratio becomes 60 divided by 90, or approximately 66.7%. A component change can therefore affect the calculation even when the PFE component itself is unchanged.
These figures illustrate the arithmetic only. They do not establish a real safe-harbor table, permissible component treatment, threshold, or project eligibility. Have the adviser define the correct inputs and method before the owner relies on a vendor’s claim that a particular percentage is sufficient.
Obtain evidence before accepting component substitutions
The notice provides identification, cost-percentage, and certification safe-harbor guidance subject to conditions. Determine which methods are available for the project and how they work together. The analysis should identify the actual products and components installed, their relevant sourcing status, and the records supporting that conclusion.
Request supplier information and certifications in the form required by the chosen supported method. A generic statement that equipment is assembled domestically may not answer the notice’s questions. Establish who provides the certification, what property it covers, when it is issued, and how contrary or updated information will be handled. Review the notice’s reliance conditions rather than treating any signed supplier letter as conclusive.
Include substitution controls in the purchasing contract and project administration. If a contractor proposes different modules, inverters, cells, or other relevant components, obtain a refreshed analysis before approval. An engineering-equivalent replacement can have a different sourcing result. The owner should know whether a price saving jeopardizes a credit assumption before the replacement is delivered and incorporated.
Preserve the final calculation and the rule relied on
Keep the construction timeline, technical specifications, component inventory, suppliers, cost or assigned-percentage calculation, certifications, due diligence, reliance analysis, and final credit determination. Reconcile the installed system against the procurement schedule and explain every material change. Preserve the applicable guidance and the project facts used in the determination.
The cash budget should include a scenario without the disputed credit while sourcing questions remain unresolved. For an illustrative $300,000 qualified-investment population and assumed 30% rate, the credit sensitivity is $90,000. That is a material funding dependency even though the equipment may still perform its operational purpose. Do not treat anticipated tax eligibility as a substitute for a funded construction plan.
Current legislation and subsequent guidance can affect taxpayer status, material assistance, safe harbors, thresholds, and other requirements. This article does not establish that a named supplier is prohibited or that a particular project qualifies. Its practical owner decision is to obtain the sourcing evidence and supported calculation before committing to a premises energy purchase, then ensure the final installed system matches the facts on which the credit analysis depends.
Sources & further reading
Consult the original guidance and its effective dates. These references support the educational discussion; their application depends on the specific facts.