Section 45X: Paid Per Unit, If You Sell It

What Each Component Earns

Production must occur in the United States and the unit must be sold to an unrelated person — or to a related person under an election treating the transfer as a sale, the route integrated manufacturers use. Components produced under contract manufacturing arrangements allocate the credit by agreement.

What OBBBA Changed

• Wind components terminate for sales after December 31, 2027.
• Metallurgical coal joined the critical minerals list at 2.5 percent of costs, for production through 2029.
• Critical minerals lost permanence — a phase-out now runs 75/50/25 percent across 2031–33, ending after 2033 (other components already phased out 2030–32).
• The integrated-component rule — from tax years after 2026, a primary component integrated into a secondary component counts as sold only if at least 65 percent of the secondary component’s direct material cost is US-sourced primary components.
• FEOC attached — prohibited foreign entities cannot claim, and components sold from 2026 must clear material-assistance ratios by class: battery components 60 percent rising to 80; solar 50 rising to 85; inverters 50 rising to 70; critical minerals exempt until 2030.

How 45X Stacks

45X is a seller-side credit that stacks cleanly with buyer-side credits: a US-made module claimed under 45X still counts toward the project owner’s 48E domestic content bonus, and the project’s own ITC basis is not reduced by the manufacturer’s 45X claim. The one hard exclusion is 48C — components produced at a facility that took the 48C facility credit cannot also earn 45X.

The clean fuel programmes extend the chain a step further. Components that ship into fuel infrastructure — electrolysers feeding 45V and CFR hydrogen pathways, cells and modules inside the storage and charging networks that earn California LCFS and Canadian CFR credits — sit one link upstream of operating credit streams that price every unit of fuel or charge delivered. A manufacturer’s 45X claim takes nothing away from any of them, which is why the full stack across a supply chain routinely spans three programmes on two sides of the border.

Monetisation follows the 45Q pattern: five years of elective pay even for taxable producers, then transfer under 6418. For cash-constrained new lines, the five-year direct-pay election is often the difference between financing rounds.

The Compliance Build

Notice 2026-15 applies the material-assistance safe harbors to manufacturers on a direct-material-cost basis, with cost averaging over periods up to a year and supplier certifications carrying a reason-to-know standard, six-year assessment and false-certification penalties. The operational consequence: bill-of-materials tracking, supplier attestations reaching up the chain, and versioned ratio computations that can be replayed at audit are now standing infrastructure for any 45X claimant — the same evidence discipline the buyer side already lives with under 48E.