Prohibited foreign entity rules

Foreign entity restrictions play a central role in determining whether a project is eligible for clean energy tax credits — and, by extension, whether those credits can be safely transferred to a buyer or investor.

The One Big Beautiful Bill replaced and significantly expanded existing foreign entity restrictions, introducing new prohibited foreign entity (PFE) rules. The US Department of the Treasury published initial guidance (Notice 2026-15) in February, and additional guidance is expected later this year.

This resource hub brings together the latest market trends, insights, and resources to help you understand and comply with PFE requirements.

Do the material assistance rules affect your tax credit?

Many tax credits transacting today carry little PFE exposure — legacy §48/§45 credits are not subject to PFE rules, and 2025 §48E/§45Y credits are safe-harbored from material assistance (though not entity-level ownership and control tests). Material-assistance obligations fall hardest on §45X and post-2025 tech-neutral projects.

Download the chart

Quick guide to PFE definitions

Understand the differences between prohibited foreign entities, specified foreign entities, and foreign-influenced entities, as well as the material assistance cost ratio test.

Download the cheat sheet

What are the experts saying about PFE compliance?

"PFE is a major threshold issue for tax insurance underwriters at this time — this is because it is not one that creates a partial loss, rather a project will be in or out and could be a total loss... We have heard about advisors willing to write it, but have yet to see anyone actually doing so. That is the chicken-and-egg problem we are in right now."

Gary Blitz
Global CEO, Aon Transaction Solutions

"Our general approach is a smell test — confirm that publicly available documents and at least some internal documentation do not show red flags. We are not just taking a counterparty's word for it, but we are realistic that we will never have all the documents."

Elizabeth Crouse
Partner, Holland & Knight

"A signed certification is an important starting point — and often necessary if you are relying on the certification safe harbor — but it is not the end of the analysis. The standard is asking whether it was reasonable to rely on that certification — that is a process question, not a document question."

Josh Morris
Partner, Novogradac

“What observers sometimes underestimate about the industry is the degree of expertise and professionalism that exists within it — by and large most participants are very sophisticated and very knowledgeable and see compliance as a core component of their overall responsibility as market participants. The responsibility of others is to ensure that the rules are clear and that they can be followed."

Katie Bays
Director of Research, Crux

“I think the important signal from the notice is that the dominant framework across the market is tier-one supplier accountability.”

Hasan Nazar
Head of Government Affairs & Public Policy, Crux

"What I have not seen enough discussion of is the recapture provision within §48E. The statutory language is broad and the provision looks onerous... The market has not fully grappled with the scope or what mitigation looks like. The best approach is to start raising awareness, and ensure clients can get out in front of it as early as possible."

Praveen Ayyagari
Managing Director, KPMG Tax

How has the market been preparing without full guidance?

Even before the release of interim PFE guidance (Notice 2026-15) in February, more than 90% of surveyed developers and manufacturers had already started ownership reviews, contract audits, and supply chain mapping.

Read the full survey report

How Crux supports PFE compliance

Crux helps developers and manufacturers, tax credit buyers and investors, lenders, and advisors navigate PFE requirements with market intelligence, clear diligence workflows, and expert support at every step:

  • PFE market signals based on proprietary transaction data.
  • PFE-specific diligence checklists.
  • White-glove support to understand and underwrite transaction risks.
  • Centralized platform that streamlines the diligence process.