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Commercial Solar ROI Calculator

Section 48E, MACRS, and Direct Pay. What the federal benefit stack actually adds up to.

Enter your project cost, entity type, and state. The calculator shows your ITC amount, MACRS depreciation tax savings, combined first-year federal benefit, and estimated payback, with full methodology transparency.

Results are shown before any contact requirement. Results are estimates for planning. Verify with your tax advisor.

  • 30% base ITC plus energy community and domestic content adders modeled
  • 100% bonus MACRS depreciation on 50%-ITC-reduced basis
  • Direct Pay routing for nonprofits, governments, and co-ops
  • July 4, 2026 construction deadline framed in context
  • Zero residential 25D credit -- this is a commercial tool

Commercial solar projects must begin construction by July 4, 2026 to qualify for the 30 percent Section 48E federal tax credit. After that date, the system must be placed in service by December 31, 2027.

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Note: this calculator is for commercial projects only.

Section 48E applies to businesses, nonprofits, governments, and other organizations. The residential Section 25D credit (30% for homeowners) expired on December 31, 2025. Homeowners buying or financing a system in 2026 receive no federal tax credit. If you are a homeowner, use the Residential Solar Savings Calculator instead.

Section 48E base ITC rate (construction by July 4, 2026)
30
Potential combined ITC + adders (energy community + domestic content)
50
Bonus depreciation rate, permanently restored by OBBBA (January 2025)
100
MACRS recovery period for Section 48E solar systems
5
Project info
Entity type
Your results

Tell us about your commercial solar project

All fields produce a range estimate. The more accurate your inputs, the tighter the range.

Small commercial (25-100 kW): roughly $50,000-$250,000. Mid-scale (100-500 kW): roughly $150,000-$850,000. These ranges are illustrative; actual quotes vary.

Leave at 100 kW if unsure. The incentive calculation does not depend on system size.

State selection does not affect the federal incentive calculation. It affects the energy production and savings estimate only.

C-Corps: typically 21%. Pass-through owners (S-Corp, Partnership, Sole Proprietor): 25-37% depending on income. Default 28% is a common midpoint. Verify with your CPA.

Energy communities include fossil-fuel employment statistical areas, brownfields, and certain census tracts. Use our Energy Community Checker to confirm your ZIP code before relying on this adder.

Domestic content requires 40% non-FEOC component value in 2026 (escalating). Your installer must provide documentation. This adder is not guaranteed without a manufacturer compliance letter.

How the federal benefit stack works

Section 48E plus MACRS plus adders: five steps that compound

The federal commercial solar benefit stack has five components. Each builds on the previous. Understanding each step helps you verify your advisor's calculations and model different scenarios.

  1. Step 1: Section 48E ITC: 30% base credit

    The base credit is 30 percent of the gross system cost, claimed as a dollar-for-dollar reduction in the year the system is placed in service. To access the full placed-in-service window (through December 31, 2030), construction must begin by July 4, 2026. Projects beginning construction after that date must be placed in service by December 31, 2027.

  2. Step 2: Adders: energy community (+10%) and domestic content (+10%)

    Eligible projects can stack adders on top of the 30% base. An energy community adder applies when the project is located in a qualifying DOE energy community area (fossil-fuel employment statistical areas, brownfields, or qualifying census tracts). A domestic content adder applies when equipment meets IRS domestic content requirements, including the 40% non-FEOC component value threshold for 2026. Both adders together can bring the total ITC rate to 50%.

  3. Step 3: ITC basis reduction: depreciable basis = gross cost minus 50% of ITC

    For MACRS purposes, the depreciable basis is the gross cost minus 50% of the ITC amount. At a 30% ITC rate, this means 85% of gross cost is depreciable. At 50% ITC rate, 75% of gross cost is depreciable. This IRS rule prevents double-counting of the federal benefit.

  4. Step 4: MACRS bonus depreciation: 100% in year 1

    The One Big Beautiful Bill Act permanently restored 100% bonus depreciation for qualified property placed in service after January 19, 2025. Solar systems qualifying under Section 48E use 5-year MACRS. At a 28% effective corporate tax rate, this produces a year-1 depreciation tax saving of approximately 23.8% of gross cost (the depreciable basis times the tax rate).

  5. Step 5: Combined year-1 federal benefit: typically 45-53% of gross cost

    At a 30% ITC and 28% effective tax rate with 100% bonus depreciation on the 85% depreciable basis: 30% + (85% x 28%) = 30% + 23.8% = 53.8% total year-1 federal benefit. The calculator above lets you model your specific inputs. Confirm all amounts with your CPA before filing.

Tax-exempt entities

Direct Pay: the IRS sends you the credit as cash

Tax-exempt entities have no federal tax liability to offset against the ITC. Section 6417 (Direct Pay) solves this: the IRS remits the credit amount as a direct cash payment, typically after the entity files its annual return. No tax equity investor required.

Qualifying entity types: 501(c)(3) nonprofits, state and local governments, tribal governments, rural electric cooperatives, and certain public utilities. The calculator above routes these entities to Direct Pay automatically and excludes MACRS from their results.

The Direct Pay amount is the same percentage of gross cost as the ITC (30% base, plus applicable adders). The key difference from a taxable entity is that MACRS depreciation provides no tax benefit since there is no income tax to reduce. Your net cost after Direct Pay is gross cost minus the Direct Pay amount.

By project type

Commercial solar for your specific facility

The benefit stack is the same across segments, but site assessment, financing structure, and permitting complexity vary. Explore the page for your facility type.

Common questions

How Section 48E and MACRS work in practice

These questions cover the mechanics that most business owners and facilities managers ask when evaluating commercial solar in 2026. For project-specific guidance, a free commercial site assessment includes a written incentive summary.

Commercial solar hub Full incentive breakdown

What is Section 48E and how is it different from the old Section 48?
Section 48E is the technology-neutral clean energy investment tax credit that replaced the technology-specific Section 48 ITC. It covers the same solar equipment but extends the benefit structure beyond the sunset of the old ITC. The 30% base rate, adder structure, and MACRS pairing are the same in practice. The key difference is that Section 48E formally has no energy-type restriction, so it applies to any clean energy system as defined by IRS guidance.

What does "construction must begin by July 4, 2026" actually mean?
The IRS recognizes two methods for establishing that construction has begun: the Physical Work Test (physical work of a significant nature has actually begun on the project) and the Five Percent Safe Harbor (5% or more of the total cost of the project has been paid or incurred). For most commercial solar projects, the Physical Work Test is satisfied by beginning site preparation or equipment installation. Consult your tax advisor to document which method applies to your specific project.

What is Direct Pay and which entities qualify?
Direct Pay (Section 6417) allows certain tax-exempt entities to receive the ITC as a direct cash payment from the IRS, even if they have no federal tax liability. Qualifying entities include: 501(c)(3) nonprofits, state and local governments, tribal governments, rural electric cooperatives, and certain public utilities. Direct Pay eliminates the need for a tax equity partnership to monetize the credit. The IRS remits the payment within a specified time after the tax return is filed.

Why does the depreciable basis get reduced by half the ITC amount?
IRS rules require that the depreciable basis for MACRS be reduced by 50% of the ITC amount. This prevents a business from receiving a full ITC credit AND depreciating the full cost. At a 30% ITC rate, the depreciable basis equals the gross cost minus 15% of the gross cost (50% of 30%), leaving 85% of the gross cost as depreciable. This is a known feature of the tax code, not a penalty; it is already accounted for in the 45-53% combined benefit range.

Do tax-exempt entities qualify for MACRS depreciation?
No. Tax-exempt entities (nonprofits, governments, co-ops) do not pay federal income tax, so MACRS depreciation has no value for them. They use Direct Pay instead. The calculator automatically routes tax-exempt entity selections to Direct Pay only and excludes MACRS from their results. Their total year-1 federal benefit is the ITC amount alone (typically 30-50% of gross cost), which is still a substantial benefit.

What is the energy community adder and how do I confirm eligibility?
The energy community adder adds 10 percentage points to the ITC rate (from 30% to 40% base). Qualifying energy communities include: statistical areas with significant fossil-fuel employment and above-average unemployment, brownfield sites, and certain census tracts defined in IRS Notice 2023-29 and updated DOE lists. The DOE publishes an Energy Communities Census Tract Map. Use our Energy Community Checker tool to look up your project ZIP code. Note that the list is updated periodically; confirm current status with the DOE map and your tax advisor.

What is the FEOC restriction for the domestic content adder?
FEOC stands for Foreign Entity of Concern, defined as entities controlled by or connected to China, Russia, North Korea, or Iran. The domestic content adder for 2026 requires that at least 40% of the total project cost comes from components that are not FEOC-restricted. This threshold escalates in subsequent years. In practice, this means your installer must provide documentation that the modules, inverters, and structural components meet the FEOC threshold. Consult your installer and a tax advisor before selecting this adder.

After July 4, 2026, can I still claim Section 48E?
Yes. Projects beginning construction after July 4, 2026 still qualify for Section 48E, but they must be placed in service by December 31, 2027, rather than December 31, 2030. The shorter placed-in-service window means less time for slow-permitting or supply-chain-delayed projects to complete. The ITC rate and adder structure remain the same. If your project missed the July 4 deadline, confirm the December 31, 2027 placed-in-service requirement with your tax advisor and factor the tighter timeline into your planning.

Get a site-specific commercial solar proposal.

This calculator uses national cost benchmarks and estimated production ratios. Your actual ITC amount, payback period, and energy savings depend on your utility rate, equipment quotes, net metering or export buyback terms, and adder eligibility. A free commercial site assessment produces a written feasibility report with exact incentive amounts and a system design.

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