IRS Guidance on Foreign Entities: What You Must Know

The Treasury Department and IRS have drawn a clearer line between who qualifies for domestic manufacturing tax credits — and who doesn't. For companies relying on Section 45X credits to make their clean energy economics work, this guidance isn't background noise. It's a recalibration of the rules they're playing by.

Section 45X, the Advanced Manufacturing Production Credit established under the Inflation Reduction Act, was designed to rebuild American manufacturing capacity in solar panels, wind components, battery cells, and critical minerals. The credit is generous by design — $3 per kilogram for battery-grade graphite, $35 per kilowatt of capacity for solar modules, and so on. But that generosity comes with guardrails, and the new prohibited foreign entity guidance is one of the most consequential of those guardrails yet.

Understanding the IRS's New Guidance

The core issue the Treasury and IRS are addressing is straightforward, even if the regulatory language isn't: certain foreign entities — specifically those with ties to countries of concern — cannot participate in transactions that generate Section 45X credits. The guidance formalizes what many in the industry suspected was coming but had been navigating through earlier IRS notices with varying degrees of confidence.

What's significant here isn't just who is prohibited — it's that the IRS is now explicitly defining the contours of that prohibition in ways that earlier notices left ambiguous.

Previous IRS notices gave taxpayers some flexibility in interpreting their eligibility, particularly around supply chain relationships and contract manufacturing arrangements. The new guidance tightens that interpretive room. Companies that were relying on a generous reading of earlier notices — particularly those involving component sourcing from suppliers with foreign entity connections — now face a harder look at whether their credit claims hold up.

The "prohibited foreign entity" classification draws from definitions established in the CHIPS and Science Act and related national security frameworks. That means entities with significant ties to China, Russia, North Korea, or Iran — including companies that are owned, controlled, or subject to the jurisdiction of those governments — are in scope. A domestic manufacturer using a Chinese-owned subsidiary to supply battery-grade materials, for example, would need to scrutinize that relationship carefully under the new rules.

One clarification worth noting: the guidance addresses the extent to which Section 45X taxpayers can continue relying on earlier IRS notices. That transition question matters enormously for companies mid-project or mid-credit cycle who structured their operations around prior guidance.

Implications for Section 45X Taxpayers

The blast radius of this guidance is wider than it might first appear. Most attention goes to the obvious targets — manufacturers with direct relationships to foreign entities. But the indirect exposure is where things get complicated.

Consider a domestic battery cell manufacturer that sources anode material from a Tier 2 supplier that is, in turn, majority-owned by a Chinese conglomerate. Under a strict reading of the prohibited foreign entity rules, that relationship could put the manufacturer's 45X credits at risk — even if the manufacturer had no direct dealings with a foreign government-linked entity. Due diligence on supply chain ownership structures, which was already a growing concern in clean energy project finance, just became a credit-qualifying requirement.

For project developers and manufacturers who have already filed 45X credit claims under prior-notice assumptions, the guidance creates a retroactive risk that their accountants and tax counsel need to assess immediately.

There are practical solutions here. First, companies need to conduct a foreign entity audit of their full supply chain — not just direct suppliers, but Tier 2 and Tier 3 relationships where ownership structures may be opaque. Second, contract manufacturing agreements should be reviewed with fresh eyes: does the arrangement create a relationship with a prohibited entity, even indirectly? Third, certifications from suppliers attesting to their ownership structure and foreign entity status are becoming a de facto standard in well-run compliance programs.

The companies that will struggle most are mid-size manufacturers who scaled up quickly to capture 45X credits but didn't build compliance infrastructure at the same pace. They now face the unpleasant task of reconstructing supply chain documentation retroactively — a solvable problem, but an expensive one.

Navigating Compliance Challenges

Clean compliance here is less about having the right answers at the moment of filing and more about having the right processes in place before credit claims are made.

The IRS's prohibited foreign entity rules put a premium on documentation. That means ownership structure charts for every significant supplier, contractual representations and warranties around foreign entity status, and ongoing monitoring as corporate ownership can and does change. A supplier that was clean at the start of a project may not be 18 months later if a private equity transaction or acquisition shifts its ownership.

Tax counsel with experience at the intersection of international corporate law and domestic energy credits are worth their fees right now. The prohibited foreign entity definitions borrow from national security frameworks that most clean energy tax lawyers weren't previously tracking closely. The learning curve is real.

The companies building durable compliance programs aren't just checking boxes — they're creating audit-ready documentation trails that will matter when IRS scrutiny of 45X claims inevitably intensifies.

For manufacturers earlier in their development timeline, now is the time to build these requirements into supplier qualification processes from the ground up. Require foreign entity disclosures as part of supplier onboarding. Make it a standard term in supply agreements that suppliers must notify you of ownership changes that could affect their foreign entity status. These aren't onerous requirements — they're the table stakes for operating in a credit regime that carries this much political and regulatory weight.

Real-World Impact: Who Feels This First

The solar manufacturing sector is feeling this most acutely. The U.S. solar supply chain has deep historical ties to Chinese manufacturing — polysilicon, wafers, cells, and modules all ran through China-linked supply chains for over a decade. Companies that reshored production under IRA incentives often did so while maintaining some upstream supplier relationships that now warrant fresh scrutiny.

Battery manufacturers are similarly exposed. The graphite supply chain, in particular, is heavily concentrated among suppliers with Chinese ownership or operational ties. A battery cell manufacturer claiming the $35 per kilowatt-hour 45X credit for battery cells needs to be confident that its anode material supplier — and that supplier's suppliers — don't trigger the prohibited foreign entity rules.

Wind component manufacturers have somewhat less direct exposure, given that the European supply chain dominates many categories. But as domestic wind manufacturing capacity has grown, some companies have sourced tooling, raw materials, or manufacturing equipment from suppliers that may now require closer review.

Early adopters of 45X credits who moved fast in 2023 and 2024 are now in a position to either validate their earlier compliance posture or face uncomfortable conversations with investors and lenders who are increasingly treating 45X credit certainty as a bankability question.

Looking Ahead

The IRS isn't done. The prohibited foreign entity guidance is part of a broader regulatory build-out around the IRA's domestic content and credit eligibility rules. Additional guidance is expected on related questions — including how foreign entity relationships interact with domestic content bonus credits and what documentation standards the IRS expects for substantiating supply chain claims.

For long-term strategy, the direction is clear: the U.S. government is using tax policy to accelerate the decoupling of clean energy supply chains from adversarial foreign entities. The 45X credit is both an incentive for domestic manufacturing and, through rules like these, a mechanism for enforcing supply chain security. Companies that understand both functions will be better positioned than those treating it purely as a revenue opportunity.

The manufacturers who thrive in this environment won't be the ones with the most aggressive credit positions — they'll be the ones with the most defensible ones.

That's not a minor distinction. As IRS audit activity around clean energy credits scales up — and it will, given the dollar volumes involved — the companies that built rigorous compliance programs from the start will process that scrutiny without disruption. The ones who didn't will be managing risk retroactively, which is always the more expensive way to do it.

If you're operating in the Section 45X credit space, the time to get ahead of foreign entity compliance isn't when the IRS asks questions. It's now. CALL TO ACTION: Explore InfraSale Marketplace for compliance resources and support!