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.

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.

What are the experts saying about PFE compliance?
What developers need to know about PFE requirements
Explore insights, regulatory updates, market data, and practical resources for understanding the new PFE regime.
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.

Resources for tax credit buyers and investors
Learn more about diligence requirements, mitigating PFE risk, and compliance pathways so you can transact confidently.
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.








