Clean Energy Tax Credits: New Guidance and Industry Response

The Treasury and IRS unveiled Notice 2026-15, the first detailed guidance on the material assistance rules introduced by the One Big Beautiful Bill Act. The notice explains how the material assistance cost ratio—often called the MAKER test—applies to the Section 45Y Clean Energy Production Credit, Section 48E Clean Electricity Investment Credit, and Section 45X Advanced Manufacturing Production Credit for facilities and components beginning construction after 2025. By defining permissible ratios of payments to prohibited foreign entities, the guidance aims to prevent foreign influence from subsidizing U.S. clean‑energy projects, a critical step for investors seeking certainty in the rapidly expanding renewable market.

The prohibited foreign entity (PFE) framework adds a dual‑level inquiry: taxpayer‑level tests and maker‑level tests. Taxpayer tests examine whether a credit claimant is a specified foreign entity owned or controlled by a covered nation—primarily China, Russia, Iran, or North Korea—or a foreign‑influenced entity that meets ownership or debt thresholds (25% ownership, 40% combined ownership, or 15% debt). Timing rules differ between the first year (first‑day measurement) and subsequent years (year‑end measurement). Maker tests focus on whether a facility or component received material assistance above the statutory ratio, effectively tying supply‑chain ownership to credit eligibility. This intricate regime forces corporations to map ownership structures, licensing agreements, and financing arrangements with unprecedented granularity.

To ease compliance, the notice offers four safe harbors: a direct‑cost method, a de‑minimis assignment rule, an identification safe harbor using predefined component lists, a cost‑percentage safe harbor based on domestic‑content tables, and a certification safe harbor that accepts supplier attestations. Industry feedback during the comment period highlighted lingering ambiguities—especially around foreign‑influenced entity definitions and the upcoming anti‑abuse rules likely targeting IP transfers. Practitioners advise clients to engage Treasury early, document safe‑harbor selections, and attach required statements to returns. As the regulatory landscape evolves, taxpayers must balance rigorous documentation with the strategic goal of leveraging clean‑energy credits, all while noting that a €500,000 investment (≈ $540,000) can unlock significant tax benefits under the new framework.