Korean Business Domestic Content Bonus Guide
How Korean Clean-Tech Manufacturers Can Qualify for the OBBBA 10% Tax Credit Uplift
The Domestic Content Bonus under the One Big Beautiful Bill Act (OBBBA) provides an additional 10% tax credit uplift for clean energy projects when developers use U.S.-sourced iron, steel, and manufactured components. While Section 45X credits reward overall production volume, qualifying for the Domestic Content Bonus increases total investment or production tax credit values from a base rate up to an extra 10%. Korean green-technology manufacturers can secure this competitive advantage for their American customers by meeting rising U.S. manufacturing thresholds, satisfying Prohibited Foreign Entity (PFE) guidelines, and providing standardized domestic sourcing certifications.
Key Takeaways
Korean clean-technology manufacturers supplying components to U.S. projects can offer their buyers a 10% tax credit uplift under the One Big Beautiful Bill Act (OBBBA) by adhering to strict domestic content rules. However, unlocking this commercial advantage requires satisfying rising U.S. sourcing thresholds, avoiding restricted foreign supplier inputs, and delivering verified safe harbor documentation.
- Two-Pillar Compliance Framework: Qualifying projects must simultaneously use 100% U.S.-manufactured structural iron and steel and satisfy an escalating U.S. manufactured product cost percentage—which reaches 50% for projects starting construction in 2026.
- Prohibited Foreign Entity (PFE) Restrictions: IRS Notice 2026-15 enforces strict Material Assistance Cost Ratio (MACR) rules, meaning that receiving material assistance from restricted entities will disqualify a component from counting toward the bonus credit regardless of domestic assembly location.
Strategic Supply Chain Action: Korean manufacturers must provide standardized Domestic Content Certifications with every shipment and prepare for upcoming integration rules to protect market access and deliver tangible tax value to U.S. buyers.
The Two-Pillar Requirement for 2026
Claiming the 10% domestic content tax credit uplift requires project developers to satisfy two distinct legal pillars simultaneously:
- Steel and Iron Pillar: Structural steel and iron components used in the project must originate 100% from U.S. manufacturing facilities.
- Manufactured Product Pillar: A statutory minimum percentage of total direct costs across all manufactured components must qualify as U.S.-produced.
Korean manufacturers supplying clean-tech components to American utility projects must ensure their products align with both standards.
2026 Adjusted Percentage Deadlines
The required U.S. content percentage increases steadily based on when project construction starts. For non-offshore wind projects beginning construction in 2026, the statutory threshold reaches 50% U.S. content.
| Construction Start Date | Required U.S. Content Percentage |
|---|---|
| Before 2025 | 40% |
| During 2025 | 45% |
| During 2026 | 50% |
| 2027 and Beyond | 55% |
Offshore wind projects feature a lower 2026 threshold of 35% due to supply chain complexities.
“Meeting the 50% U.S. domestic content threshold and strict PFE guidelines allows Korean manufacturers to deliver vital tax benefits directly to their U.S. buyers.”
Foreign Entity Rules and Material Assistance
IRS Notice 2026-15 introduced strict guidelines regarding Prohibited Foreign Entity (PFE) involvement. Under these rules, receiving material assistance from a PFE disqualifies a component from domestic content calculations. Even if a company assembles a battery cell inside the United States, PFE-sourced inputs will invalidate the bonus claim.
To comply, manufacturers must calculate and report a Material Assistance Cost Ratio (MACR). This quantitative metric proves that the ratio of PFE-sourced inputs stays safely below annual statutory limits. Korean firms must audit their Tier-2 and Tier-3 suppliers to remove restricted inputs from their supply chains.
Strategic Actions for Korean Manufacturers
Korean manufacturers selling battery cells, solar panels, or power hardware in the U.S. sell both a physical product and a valuable tax benefit. First, implement standardized documentation using the IRS Identification Safe Harbor. Providing a verified Domestic Content Certification with every product shipment gives U.S. buyers the audit proof they require.
Second, prepare for upcoming domestic content supply chain cliffs. The 65% integration rule requires 65% of sub-components within primary components to be U.S.-manufactured. Transitioning secondary suppliers now ensures uninterrupted market access and protects your long-term commercial competitiveness across the United States.
Partnering with Brady Ware’s Korean CPA to Secure Domestic Content Incentives
Navigating the OBBBA Domestic Content Bonus requires Korean battery, solar, and clean-tech manufacturers to align complex supply chain logistics with strict IRS tax regulations. While securing the 10% tax credit uplift offers American buyers a compelling reason to choose your components, unmanaged compliance risks—such as failing the 50% U.S. content threshold, relying on Prohibited Foreign Entities (PFEs), or lacking standardized certifications—can disqualify projects and damage client trust. By pairing rigorous supply chain audits and MACR tracking with the specialized, bilingual expertise of Jin Lim, Leader of Brady Ware’s Korean Business Practice, Korean manufacturers can streamline U.S. compliance, protect their commercial advantage, and maximize long-term profitability across the United States.
Disclaimer: This article provides general information and should not be considered professional financial or tax advice. Please consult with a qualified CPA or financial advisor for guidance specific to your individual business needs.
Questions?
Jin (Korean CPA) leads Brady Ware’s International Tax – Tariff team. With extensive cross-border advisory experience, he provides entity setup, compliance, and M&A services, as well as outsourced accounting and business consulting for international companies and high-net-worth individuals navigating the U.S. market.