Compliance
Navigating U.S. Energy Tax Credits & Prohibited Foreign Entities After the One, Big, Beautiful Bill
How businesses can determine eligibility for clean energy tax credits in light of new restrictions on involvement with prohibited foreign entities.
By NomadicTax Research Team • 5-8 min read • March 28, 2026
## Understanding the New Rules Under the One, Big, Beautiful Bill (OBBB)
The OBBB added requirements around **taxpayer involvement with “prohibited foreign entities” (PFEs)** for energy tax credits in Sections 45Y, 48E, and 45X. Treasury and IRS issued guidance (Notice 2026-15) that helps taxpayers assess whether energy-producing facilities, storage technologies, or manufacturing components are receiving “material assistance” from a PFE — and therefore ineligible for certain incentives.([irs.gov](https://www.irs.gov/newsroom/treasury-irs-provide-guidance-for-certain-energy-tax-credits-regarding-material-assistance-provided-by-prohibited-foreign-entities-under-the-one-big-beautiful-bill?utm_source=openai))
## Key Terms & Safe Harbor Guidance
| Term | Meaning | Why it matters |
|------|---------|----------------|
| **PFE (Prohibited Foreign Entity)** | An entity defined under IRC §7701(a)(51), involving ownership or control by foreign governments or entities deemed prohibited. | If any material assistance is from a PFE, credits are disallowed.([irs.gov](https://www.irs.gov/irb/2026-11_IRB?utm_source=openai))|
| **Material Assistance Cost Ratio (MACR)** | A ratio comparing costs sourced from PFEs or other foreign-controlled sources to total costs. | Determines disqualification unless safe harbor thresholds are met.([irs.gov](https://www.irs.gov/irb/2026-11_IRB?utm_source=openai))|
The IRS has published **interim safe harbor tables** under these IRC sections. Taxpayers may use those until final regulations are issued. Eligible facilities built after December 31, 2025, or components sold after July 4, 2025, may rely on current safe harbor rules.([irs.gov](https://www.irs.gov/newsroom/treasury-irs-provide-guidance-for-certain-energy-tax-credits-regarding-material-assistance-provided-by-prohibited-foreign-entities-under-the-one-big-beautiful-bill?utm_source=openai))
## Implications for Tax Planning & Structure
**Who is impacted?** Energy producers, manufacturers of clean energy components, and finance/capital providers tied to these credits.
**What to watch for:**
- Review supply chains to identify foreign-sourced or foreign-owned inputs.
- Ensure recordkeeping documents enable cost tracing for MACR determinations.
- Confirm contracts with vendors or licensors around beneficial ownership or licensing involve PFEs.
### Example Scenario
Suppose a solar panel manufacturer sources solar cells manufactured by a firm headquartered in a country governed by PFE rules. If those costs constitute too high a portion of component costs, the facility might lose eligibility for Section 48E credits unless the supplier qualifies under the safe harbor or the taxpayer appropriately mitigates the PFE involvement.
## Actionable Steps for Businesses & Advisors
1. **Audit your supply chain:** identify any component or vendor that’s a foreign entity, particularly from PFE-listed jurisdictions.
2. **Engage with procurement, legal, and tax teams** to ensure contracts and costs are structured to avoid PFEs where possible.
3. **Use interim safe harbor calculations** to evaluate current eligibility until final regulations are released.
4. **Collect documentation early** — purchase invoices, vendor certifications, and ownership disclosures will be critical.
## Compliance & Timing Outlook
- The IRS explicitly plans **to publish proposed regulations** to define PFEs and MACR, with requirements applying according to construction dates and dates of purchase.([irs.gov](https://www.irs.gov/irb/2026-11_IRB?utm_source=openai))
- For projects placed in service after December 31, 2025, or eligible components sold after July 4, 2025 — these interim rules and safe harbors immediately matter. Delays or contract dates can drastically affect eligibility.
**Bottom line:** If you're in clean energy or advanced manufacturing and want to secure tax credits under OBBB, now is the moment to shore up documentation, vet foreign partners, and leverage safe harbor frameworks. Don’t wait for final regulations — you'll need a defensible position from day one.