Solar In 2026

US Solar ITC Deadline July 4 2026: EPC Action Guide

Shashank ·Founder·June 12, 2026·10 min read

TL;DR: The One Big Beautiful Bill Act (OBBBA), signed July 4, 2025, set a hard construction start deadline of July 4, 2026 for commercial solar projects to retain eligibility for the Section 48E Investment Tax Credit (ITC) at 30% with a four-year completion window through 2030. Projects missing this deadline and not placed in service by December 31, 2027 receive no federal ITC. There are 22 days left. The rules changed in a way most EPCs have not fully absorbed: IRS Notice 2025-42 eliminated the 5% cost safe harbor for solar systems above 1.5 MW. For large commercial projects, the only way to establish beginning of construction is the Physical Work Test, which requires actual excavation, foundation work, or installation of key components. Planning, permitting, and purchasing equipment do not qualify. Separately, FEOC (Foreign Entity of Concern) rules effective January 1, 2026 restrict full ITC eligibility for projects using materials from China, Russia, Iran, or North Korea. The good news: 100% bonus depreciation is now permanent, battery storage retains ITC eligibility through 2033, and state-level incentives are fully intact. This blog covers the complete action checklist for commercial EPCs with projects currently in their pipeline.

The OBBBA Changed Everything: What the Law Actually Says

The Inflation Reduction Act of 2022 extended the 30% commercial solar ITC through 2032 with a planned gradual phase-down. The OBBBA, signed exactly one year ago today, altered that timeline aggressively for solar and wind. The mechanism: projects whose construction begins after July 4, 2026 must be placed in service by December 31, 2027 to qualify for any ITC. That is an 18-month window from the new-construction deadline to full operation. For most commercial solar projects in the United States, with normal permitting, interconnection, and construction timelines, 18 months from a standing start is not achievable.

The exception is the critical lever: projects that can demonstrate construction began on or before July 4, 2026 are not subject to the December 2027 placed-in-service deadline. Instead, under the IRS continuity safe harbor, those projects have until December 31, 2030, four full calendar years from the year construction began, to be placed in service and still qualify for the full 30% ITC plus applicable bonus adders.

This means the actual decision facing every commercial EPC right now is not "should we rush to complete?" It is "can we begin construction by July 4?" Beginning construction buys four years. Missing the deadline leaves an 18-month window that the majority of projects cannot realistically meet.

Path 1: Begin Construction by July 4, 2026

Full 30% ITC retained (Section 48E)
Four years to complete: place in service by December 31, 2030
Bonus adders available: domestic content, energy community, low-income
100% bonus depreciation available in year one
FEOC compliance required for construction starting in 2026

Path 2: Miss the July 4 Deadline

Must be fully placed in service by December 31, 2027 to qualify for any ITC
18-month window from deadline to completion, tight for most commercial projects
Typical permitting alone takes 3 to 6 months in most states
Typical interconnection queue adds 6 to 18 months
Miss both deadlines: zero federal ITC, no exceptions

The Rule Most EPCs Have Not Read: The 5% Safe Harbor Is Gone for Large Projects

Under the IRA rules that governed commercial solar through 2024, the most common way to establish "beginning of construction" was the 5% Cost Safe Harbor: pay or incur at least 5% of total project costs before the relevant date, and construction is deemed to have begun. Ordering panels, signing procurement contracts, and making a deposit typically covered it. That approach no longer applies to large solar projects.

IRS Notice 2025-42, issued August 15, 2025 in response to an executive order from President Trump, eliminates the 5% Cost Safe Harbor for solar facilities with a maximum net output exceeding 1.5 MW. For systems above this threshold, which covers virtually all commercial EPCs' ground-mount and larger rooftop projects, the only method to establish beginning of construction for purposes of the July 4 deadline is the Physical Work Test.

What the Physical Work Test actually requires

The Physical Work Test requires physical work of a significant nature to have occurred on or before July 4, 2026. The IRS Notice and established case law are specific about what qualifies and what does not.

Work that qualifies includes: excavation and site grading; installation of foundation pads or concrete footings for racking structures; physical installation of racking or mounting systems; manufacture of customised components specifically fabricated for the project; and installation of electrical conduit or cabling runs.

Work that does not qualify: preparing project plans, designs, or engineering drawings; applying for or receiving permits; ordering equipment or signing procurement contracts; conducting environmental or structural surveys; and any preliminary activity that does not physically alter the site or produce a project-specific manufactured component.

The 5% Safe Harbor remains for small systems

The 5% Cost Safe Harbor is still available for solar facilities with a maximum net output of 1.5 MW or less. For EPCs working on smaller commercial rooftop or community solar projects in this range, procuring and paying for at least 5% of total project costs on or before July 4, 2026 still establishes beginning of construction. The system must still be placed in service within the continuity safe harbor period. Confirm with tax counsel that the specific project configuration falls within the 1.5 MW threshold before relying on the 5% method.

FEOC: The Procurement Constraint That Took Effect January 1, 2026

Separate from the construction-start deadline, the OBBBA introduced Foreign Entity of Concern (FEOC) rules that affect ITC eligibility for any commercial solar project beginning construction from January 1, 2026 onward. FEOC refers to entities that are owned, controlled, or significantly financed by the governments of China, Russia, Iran, or North Korea, defined as entities where those governments hold 15% or more of debt or equity.

The operative rule is the Material Assistance Cost Ratio (MACR). In 2026, at least 40% of a project's relevant equipment costs must come from non-FEOC sources. This threshold rises by 5% annually. A project that fails the MACR test does not qualify for the Section 48E ITC regardless of when construction begins.

What this means for panel procurement

Most Chinese solar manufacturers, including Jinko Solar, LONGi, Trina Solar, Canadian Solar, and BYD, are considered FEOC sources. Panels manufactured in Vietnam, Malaysia, or Thailand by Chinese-owned entities are also captured by the FEOC rules. United States assembly does not cure FEOC status: a system assembled in Georgia using Chinese-origin cells remains subject to the full FEOC cost ratio calculation for those cells.

FEOC-compliant panel manufacturers confirmed as of June 2026 include: First Solar (Perrysburg, Ohio, full US supply chain), QCells/Hanwha (Dalton, Georgia), Silfab Solar (Canadian/US manufacturing), and Mission Solar (San Antonio, Texas). According to NuWatt's verified manufacturer database and PowerFlex's procurement guide, lead times for these panels have extended to 8 to 12 weeks in many markets as the July 4 deadline approaches. For EPCs who need to place orders to meet the Physical Work Test timeline, procurement decisions must be made now.

The 10-year recapture risk EPCs must explain to clients: Under the OBBBA, if a project owner claims the Section 48E ITC and then makes payments under a contract that gives a Specified Foreign Entity effective control over the project within the following 10 years, the full ITC amount must be repaid. FEOC compliance is not a one-time procurement check at installation. It is a decade-long obligation that extends through operations, maintenance, and warranty arrangements. Tax counsel should review all ongoing service contracts for FEOC exposure before ITC is claimed.

The Complete Bonus Stack: What Commercial EPCs Can Still Capture

The base 30% Section 48E ITC is the floor. Three additive bonus credits can stack on top for qualifying projects beginning construction by July 4, 2026.

What EPCs Must Do in the Next 22 Days

Step 1: Triage the pipeline by project size

Separate every active project into three categories. Projects of 1.5 MW and below can use the 5% Cost Safe Harbor, order and pay for at least 5% of project costs by July 4 to establish beginning of construction. Projects above 1.5 MW must use the Physical Work Test, schedule mobilisation and begin actual physical site work by July 4. Projects that cannot begin physical work by July 4 in time face the December 2027 placed-in-service deadline and need a realistic assessment of whether that timeline is achievable given current permitting and interconnection status.

Step 2: Verify FEOC compliance before ordering panels

Before placing any panel order for a 2026 project, confirm the manufacturer's FEOC status. Use manufacturer-issued compliance certifications (permitted under February 2026 interim guidance, IRS Notice 2026-15) as the documentation basis. Do not rely on the country of assembly alone. Confirm the origin of the cells, wafers, and key upstream components. For projects where FEOC-compliant panels are not yet secured, contact First Solar, QCells, Silfab, or Mission Solar immediately. Eight-to-12-week lead times mean orders placed this week arrive at the end of August, well within a 2026 project timeline but only if ordered now.

Step 3: Document construction start with IRS-compliant evidence

The Physical Work Test is only as strong as the documentation behind it. For each project that will rely on the test, prepare a contemporaneous record of the physical work performed on or before July 4: dated photographs, equipment mobilisation logs, contractor sign-in sheets, and a written description of the physical work performed. The IRS specifically flags that it will scrutinise "artificial acceleration or manipulation of eligibility", the work must be genuine and of a significant nature, not a token ground-breaking ceremony. Consult tax counsel to ensure the specific activities meet the IRS standard before treating the test as satisfied.

Step 4: Update every client proposal to reflect 2026 reality

Any commercial solar proposal currently in circulation that was prepared before the OBBBA changes were fully understood needs to be reviewed against the current rules. Specifically: residential ITC proposals are now incorrect (the credit no longer exists for homeowner-purchased systems); commercial proposals must reflect the July 4 deadline clearly; any proposal citing a Chinese panel manufacturer needs to address FEOC and the MACR calculation; and any proposal that assumed the 5% safe harbor for a system above 1.5 MW is technically non-compliant with current IRS guidance. Reslink's solar proposal workflow allows EPCs to generate updated financial models with current ITC percentages, bonus stacks, and 100% bonus depreciation applied automatically from the system design, so every proposal reflects what clients will actually receive.

Frequently Asked Questions

Q1. What is the commercial solar ITC deadline in 2026?

The critical deadline is July 4, 2026. Under the One Big Beautiful Bill Act (OBBBA, Public Law 119-21), commercial solar projects under Section 48E must begin construction on or before July 4, 2026 to retain the standard completion window. Projects beginning construction by that date have until December 31, 2030 under the IRS continuity safe harbor (four calendar years from the year construction began) to be placed in service and claim the full 30% ITC. Projects that do not begin construction by July 4 must be fully placed in service by December 31, 2027 to qualify for any ITC. Projects missing both dates receive no federal Section 48E investment tax credit. The residential solar tax credit (Section 25D) is separately gone: it expired December 31, 2025 with no replacement for homeowners who purchase systems directly.

Q2. Does ordering solar panels before July 4 count as beginning construction?

For projects above 1.5 MW, no. IRS Notice 2025-42 (August 2025) eliminates the 5% Cost Safe Harbor for solar facilities with maximum net output exceeding 1.5 MW. Under that notice, ordering panels, signing procurement contracts, making deposits, or paying for equipment does not establish beginning of construction for the purposes of the July 4, 2026 deadline. The only qualifying method for these projects is the Physical Work Test, which requires physical work of a significant nature: excavation, foundation installation, racking installation, or manufacture of custom project-specific components. Planning, permitting, and purchasing do not qualify. For projects of 1.5 MW or less, the 5% Cost Safe Harbor remains available: incurring at least 5% of total project costs on or before July 4 still establishes beginning of construction. Confirm the system's net output threshold with tax counsel before selecting which method to use.

Q3. What are FEOC rules and which solar panels are affected?

FEOC stands for Foreign Entity of Concern. Under the OBBBA, projects beginning construction from January 1, 2026 must meet the Material Assistance Cost Ratio (MACR): in 2026, at least 40% of relevant equipment costs must come from non-FEOC sources. FEOC entities are those with 15% or more ownership or financing from the governments of China, Russia, Iran, or North Korea. Most major Chinese solar manufacturers, including Jinko Solar, LONGi, Trina Solar, Canadian Solar, and BYD, are FEOC sources. US assembly does not cure FEOC status if the cells are Chinese-origin. FEOC-compliant manufacturers include First Solar (Ohio), QCells/Hanwha (Georgia), Silfab Solar (Canada/US), and Mission Solar (Texas). Manufacturers may issue self-certification letters confirming FEOC compliance under interim IRS guidance (Notice 2026-15, February 2026). Consult tax counsel to verify FEOC compliance for your specific supply chain before claiming the ITC.

Q4. Is the residential solar tax credit still available in 2026?

Q5. Does 100% bonus depreciation still apply to commercial solar in 2026?

Yes. The OBBBA made 100% bonus depreciation permanent for qualifying commercial energy systems, including solar panels, solar plus battery storage, and standalone battery storage systems, placed in service after January 19, 2025. Under MACRS, businesses can deduct the full cost of a qualifying solar system in the first year it is placed in service, regardless of the system's expected useful life. This is separate from the Section 48E ITC and applies independently of whether the project meets the July 4 construction start deadline. Combined with the 30% ITC, the tax benefits from the credit and first-year depreciation can offset 50 to 60% or more of total project costs in year one for qualifying commercial projects. Consult a tax advisor to model the specific interaction of ITC and bonus depreciation for your project, as ITC basis reduction rules affect the depreciation calculation.

Q6. How does the July 4, 2026 deadline affect battery storage projects?

Battery energy storage systems have a significantly better position than solar under the OBBBA. Standalone battery storage retains ITC eligibility under Section 48E through 2033, without the accelerated construction-start deadline applied to solar and wind. Battery storage projects beginning construction in 2026 are subject to FEOC rules, but the MACR thresholds apply differently to storage components than to solar modules, and storage projects that began construction before the end of 2025 avoid the FEOC material assistance test entirely. For commercial EPCs advising clients on combined solar and battery projects in 2026, the solar component faces the July 4 deadline while the storage component retains flexibility through 2033. These two components should be modelled separately in any client proposal that includes both solar generation and battery storage.