2026 is a pivotal year for commercial solar. The 48E Clean Energy Investment Tax Credit remains intact to provide a credit of 30% (or more), but compliance has become more technical and more strategic. Under the One Big Beautiful Bill Act (OBBBA) and subsequent IRS guidance, solar projects must now navigate Foreign Entity of Concern (FEOC) rules, domestic content thresholds, placed-in-service deadlines, safe harbor timing rules, and elective payment (direct pay) procedures.
For businesses, nonprofits, school districts, hospitals, and municipalities considering solar in 2026, the opportunity remains strong, but successful projects will be those that integrate tax, procurement, and compliance planning from day one.
This article provides a high-level overview of what matters most in 2026.
The Core Incentive: Section 48E ITC
Unlike the residential solar credit under Section 25D, which terminated in 2025, federal tax credits remain available for commercial solar projects placed in service until December 31, 2027 under the One Big Beautiful Bill Act (OBBBA). For solar projects placed in service in 2026, the relevant credits are:
- Section 48E — Clean Electricity Investment Credit (ITC)
- Section 45Y — Clean Electricity Production Credit (PTC)
Most commercial solar projects (rooftop, canopy, ground-mount) will elect Section 48E, which provides a base credit of 30% of eligible project cost.*
45Y is typically used for large utility-scale or power-purchase-agreement (PPA) projects where a production-based incentive may be more advantageous.
For most businesses and public entities in 2026, the 48E credit remains the primary driver of project economics.
*Projects over 1mW (as measured in alternating current) must meet prevailing wage and apprenticeship (PWA) requirements or the base credit is only 6%.
Beginning Construction and Placed In Service Deadlines Under OBBBA
To be eligible for the Section 48E or Section 45Y tax credits, a commercial solar project must generally be placed in service by December 31, 2027. For most projects that begin construction in 2026, this should be relatively easy. Larger projects that cannot meet that timeline have a short window to begin construction (as signified by the Physical Work Test as outlined in IRS Notice 2025-42) by July 4, 2026 to have additional time to complete that project and still claim a tax credit. Projects that are under 1.5 mW can still Safe Harbor the project under the Five Percent Safe Harbor Rule
For 2026 projects, this means:
- Projects that begin in 2026 and are placed in service by December 31, 2027 remain eligible for the Section 48E and 45Y tax credits, provided that the project meets FEOC requirements.
- Projects that Safe Harbor the beginning of construction by July 4, 2026 (as outlined in Notice 2025-42) have up to four (4) years to be placed in service and remain eligible for the tax credits.
Safe Harbor Tip: Projects under 1.5 mW can still Safe Harbor under the Five Percent Safe Harbor Test, which is largely satisfied by making payments to a solar installer for a project. If there is a chance that your project will not be placed in service by December 31, 2027, it is highly recommended you document Safe Harbor in the first half of 2026 to protect your tax credit.
Foreign Entity of Concern (FEOC) Rules: What 2026 Solar Projects Must Understand
Perhaps the most significant structural change for 2026 projects is the implementation of FEOC restrictions.
Recent IRS guidance, including IRS Notice 2026-15, clarifies how projects are tested for “material assistance” from a prohibited foreign entity (PFE).
What Is a Foreign Entity of Concern?
Under the statutory framework established by the OBBBA, a project may lose eligibility for clean energy tax credits if:
- The taxpayer itself is a prohibited foreign entity; or
- The facility receives material assistance from a prohibited foreign entity.
A prohibited foreign entity generally includes:
- Certain foreign governments and their controlled entities. This list includes China, Russia, North Korea and Iran. For solar and storage projects, the majority of the FEOC concerns will stem from China, as the other countries don’t have much clean energy manufacturing or influence.
- Entities identified on specific federal restriction lists.
- Foreign-influenced entities subject to significant ownership or control by designated countries.
For most commercial solar projects, the concern is not project ownership, it is the supply chain. Solar modules, inverters, trackers, battery systems, and subcomponents may originate from global manufacturers. The FEOC framework requires developers to examine whether any of those inputs trigger disqualification thresholds.
Material Assistance Cost Ratio (MACR)
IRS Notice 2026-15 introduces the primary compliance mechanism: the Material Assistance Cost Ratio (MACR).
The MACR measures how much of a project’s direct costs are attributable to non-prohibited sources:
MACR = (Total Direct Costs – PFE Direct Costs) ÷ Total Direct Costs
If the portion of direct costs linked to PFEs exceeds permitted thresholds, the project may be ineligible for credits under Section 48E or 45Y.
Key elements include:
- Total Direct Costs: Costs of manufactured products and components incorporated into the solar facility.
- PFE Direct Costs: The portion of those costs attributable to prohibited foreign entities.
The calculation focuses on manufactured products, including:
- Solar modules and cells
- Inverters
- Trackers and racking systems
- Integrated battery systems
- Other manufactured product components
Structural steel and iron used purely as construction materials are generally excluded from MACR calculations unless classified as manufactured products.
For projects beginning construction in 2026, at least 40% of the MACR must come from non-FEOC supply for solar projects and 55% for battery storage projects.
FEOC Safe Harbors to Simplify Compliance
Recognizing the complexity of global supply chains, IRS Notice 2026-15 provides interim safe harbors designed to make compliance administratively workable.
- Identification Safe Harbor
Taxpayers may rely on previously issued domestic content table under IRS Notice 2025-8 to identify which manufactured products and components must be included in MACR calculations. Items not listed in those tables may be excluded from analysis. This significantly reduces ambiguity in determining what must be counted. - Cost Percentage Safe Harbor
Developers may use pre-established cost allocation percentages from domestic content guidance to assign relative cost values to components, rather than tracing every dollar of procurement cost in detail. - Certification Safe Harbor
Taxpayers may rely on supplier certifications stating that the supplier is not a prohibited foreign entity. However, reliance is only permitted if the taxpayer does not have reason to know the certification is inaccurate. Proper documentation and contractual representations are essential.
These safe harbors do not eliminate compliance obligations, they structure it.
FEOC: Practical Implications for 2026 Solar Projects
For businesses, nonprofits, and municipalities considering solar in 2026, FEOC compliance requires procedural discipline in three primary areas:
Supply Chain Screening
Procurement teams must screen primary equipment suppliers for PFE exposure. This may require reviewing corporate ownership structures and obtaining written certifications during contract negotiation.
Cost Allocation and Documentation
Finance and tax teams must maintain records sufficient to demonstrate MACR compliance, including component identification and cost allocation methodology.
Early Integration into Project Planning
FEOC considerations must be incorporated before equipment purchase orders are executed. Waiting until tax filing season to assess compliance introduces risk.
Importantly, FEOC rules apply regardless of whether a project claims the credit through traditional tax equity or through elective payment (direct pay). Public and nonprofit entities are not exempt from FEOC requirements.
FEOC: Strategic Takeaway
The FEOC framework represents a structural shift in federal clean energy incentives. It moves beyond project ownership and into the upstream supply chain, requiring developers and owners to understand not just what they are buying, but from whom.
For 2026 solar projects, the message is straightforward:
- Screen suppliers early.
- Document cost allocations carefully.
- Utilize safe harbors where appropriate.
- Coordinate tax, legal, and procurement teams before finalizing equipment contracts.
Solar incentives remain powerful. But in 2026, eligibility depends as much on structured compliance as it does on system design.
Organizations that integrate FEOC diligence into project development from the outset will protect credit value and reduce risk — while continuing to benefit from one of the most significant clean energy investment frameworks in U.S. history.
Domestic Content Bonus Credit
In addition to avoiding FEOC disqualification, projects may increase credit value by qualifying for the Domestic Content Bonus Credit.
If domestic content thresholds are met, the credit increases by 10 percentage points.
For a PWA-compliant project:
- Base 48E = 30%
- With domestic content = 40%
What Counts as Domestic Content?
Two tests apply:
- Steel and Iron Requirement
Structural steel and iron must be 100% U.S. produced. - Manufactured Products Requirement
A percentage of total manufactured product costs must be U.S. produced.
That percentage increases over time.
The IRS has issued safe harbor tables in IRS Notice 2025-8 that assign cost percentages to solar components, which simplify compliance.
For 2026 projects, domestic content compliance often aligns operationally with FEOC screening — both require detailed supplier documentation and cost allocation.
Strategically, domestic content may increase upfront equipment cost but improve after-tax return.
Elective Payment (Direct Pay): A Game-Changer for Public and Nonprofit Entities
One of the most transformative features of the clean energy framework is elective payment, often called “direct pay.”
Under Section 6417, certain entities may receive the value of tax credits as a direct payment from the U.S. Treasury.
Eligible entities include:
- Municipalities
- School districts
- Tribal governments
- Nonprofits
- Homeowners Associations
- Rural electric cooperatives
For these entities, solar no longer requires tax equity structures. Instead:
- Project is placed in service.
- Credit is calculated (e.g., 30% or 40% of eligible cost).
- Entity files an elective payment election.
- Treasury issues direct payment.
This has fundamentally reshaped solar economics for public and nonprofit sectors.
However:
- FEOC rules apply.
- Registration requirements must be completed before filing.
Additionally, for Elective Payment projects that are over 1 mW, projects must meet both the Prevailing Wage and Apprenticeship (PWA) Requirements and the Domestic Content Bonus Credit requirements to be eligible for the full elective payment.
In 2026, direct pay remains fully available, but compliance precision is essential.
Putting It All Together: A 2026 Solar Decision Framework
For businesses and institutions evaluating solar in 2026, here is a practical framework:
Step 1: Determine Ownership Structure
- Taxable business? Likely claim Section 48E.
- Nonprofit or municipality? Evaluate Elective Payment.
Step 2: Confirm Prevailing Wage & Apprenticeship Compliance
- Essential for unlocking the 30% base credit for projects over 1 mW AC.
Step 3: Evaluate Domestic Content Strategy
- Can the project reach 40% total credit?
- What is the premium cost versus benefit?
Step 4: Screen for FEOC Exposure
- Vet suppliers.
- Obtain certifications.
- Document cost breakdowns.
Step 5: Consider Safe Harbor
- Lock in timing.
- Secure procurement.
- Protect economics.
Step 6: Align Documentation Early
- Cost allocation records.
- Supplier attestations.
- Interconnection cost separation.
- Registration for elective payment if applicable.
Final Thoughts
The days of “install solar, claim credit later” are over. The projects that succeed in 2026 will be those that treat compliance as part of project design.
The 2026 commercial solar landscape is robust but more structured than ever.
For businesses, nonprofits, and municipalities, the opportunity remains extraordinary, but the execution must be disciplined.
Organizations that approach solar with an integrated tax, procurement, and compliance strategy will capture maximum federal support while minimizing risk.
If you are evaluating a 2026 commercial solar project and want clarity on FEOC screening, domestic content modeling, safe harbor timing, or elective payment strategy, professional guidance early in the planning process can materially improve outcomes.
The opportunity is still strong. The structure is simply more sophisticated.