Commercial Solar Tax Incentives in 2026

The federal commercial solar ITC under Section 48E is currently 30% of the total system cost for projects that began construction before July 4, 2026 and are placed in service by December 31, 2027. For projects beginning construction on or after July 4, 2026, the project must be placed in service by December 31, 2027 to claim the credit. The ITC is a dollar-for-dollar reduction in federal income tax owed, making it one of the most powerful incentive structures in the tax code.

The One Big Beautiful Bill Act, signed on July 4, 2025, made significant changes to the energy tax credit landscape. For commercial solar, the key changes include: (1) A safe harbor construction deadline of July 4, 2026 for projects to qualify for the full ITC rate; (2) A final in-service deadline of December 31, 2027 for all projects to claim the credit; (3) New Foreign Entity of Concern (FEOC) restrictions requiring domestic content documentation for projects beginning construction after July 4, 2025; (4) The expiration of the residential 25D solar credit effective December 31, 2025. The commercial 48E credit itself was preserved, not eliminated.

The energy community ITC adder provides an additional 10% tax credit for commercial solar projects located in qualifying energy communities — areas that have historically relied on fossil fuel industries and face economic transition challenges. Qualifying areas include coal closure tracts, coal mine closure areas, brownfields, and statistical areas meeting unemployment and fossil fuel employment thresholds. The Department of Energy maintains an online mapping tool to verify energy community status for any specific address. We verify eligibility for every project as part of our proposal process.

The domestic content adder provides an additional 10% ITC for projects that use solar panels, racking, and inverters manufactured in the US by non-FEOC entities. This requires careful documentation of the manufacturing origin of each major component. Equipment from China, Russia, Iran, and North Korea is prohibited under FEOC rules for projects beginning construction after July 4, 2025. When both the energy community and domestic content adders apply alongside the base 30% ITC, the combined credit reaches 50% of system cost.

Yes. The residential Section 25D solar tax credit expired December 31, 2025 under the OBBBA. Homeowners installing solar after that date receive no federal tax credit. This is separate from the commercial ITC (Section 48E), which remains available through December 31, 2027. For businesses, the expiration of 25D is irrelevant — the commercial ITC was not eliminated. However, if your business receives search traffic from homeowners looking for solar tax credits, redirecting them to understand the commercial credit opportunity is worth addressing in your marketing.

MACRS (Modified Accelerated Cost Recovery System) allows commercial solar assets to be depreciated over 5 years for federal tax purposes, with bonus depreciation available in some years. For businesses that claim the full ITC, the depreciable basis of the solar system is reduced by 50% of the ITC claimed (so a 30% ITC reduces basis by 15%). Even with this basis reduction, MACRS depreciation generates significant additional tax benefit in the first 2-3 years of system operation, further improving first-year economics.

Two critical deadlines apply. First: projects must begin construction by July 4, 2026 to qualify for the full ITC under the safe harbor provision. "Beginning construction" requires either physical work beginning on-site or 5% of project costs incurred and paid. Second: all qualifying projects must be placed in service (activated and connected to the grid) by December 31, 2027 to claim the ITC. Projects that begin construction after July 4, 2026 must also meet the December 31, 2027 in-service deadline.

Yes. Many states offer additional incentives that stack with the federal ITC. Examples include Illinois Shines SRECs (15-year income contracts), Massachusetts SMART (20-year production payments), New Jersey SREC II (15-year contracts), Maryland SREC market income, California SGIP battery rebates, Arizona 10% corporate tax credit, and numerous state property and sales tax exemptions. The specific incentives available depend entirely on your state, utility territory, and project characteristics. Our proposals always include a complete state and local incentive analysis.