COMMERCIAL SOLAR
Commercial Solar Incentives in California and Arizona
The federal window for commercial solar is closing on a fixed date. Here is what your business can still claim, what it takes to qualify, and what changed.
Where commercial incentives stand right now
Commercial solar incentives are worth real money, and they are on a clock. The federal investment tax credit still covers 30 percent of a qualifying project, and bonus depreciation can accelerate most of the remaining cost into your first tax year. But the rules that govern eligibility were rewritten in July 2025, and the most important deadline already passed in July 2026.
This page explains the incentives available to California and Arizona businesses right now, in the order they actually affect your project economics. If you want this applied to your building, our commercial team will model it against your utility rate, your tax position, and your timeline.
The Federal Credit
The deadline is the first thing to understand
The federal Investment Tax Credit for commercial solar sits in Section 48E of the tax code. It is a dollar-for-dollar reduction in federal income tax, not a deduction, and the base credit is 30 percent of qualifying project cost. The One Big Beautiful Bill Act, signed July 4, 2025, put two dates around it.
Construction began on or before July 4, 2026
Your project has a four-year completion window and is not subject to the 2027 cutoff.
Construction begins after July 4, 2026
Your system must be placed in service by December 31, 2027. Miss that date and the federal credit is gone entirely. There is no reduced rate and no extension.
What "placed in service" actually means
Placed in service means the system is complete, inspected, and has received permission to operate from your utility. It does not mean panels are on the roof and it does not mean you have paid for the project.
Interconnection queues in both states routinely add weeks or months after physical completion. That queue time sits inside your deadline, not outside it.
A commercial project starting today has roughly seventeen months to go from signed contract through design, permitting, construction, inspection, and utility interconnection. That is achievable for most rooftop and carport projects. It is tight for anything requiring a service upgrade, a structural retrofit, or a complex interconnection study.
Bonus Credits
How credits can work together
The base credit can be increased by adders. Most projects qualify for one. Some qualify for two. Qualifying for all of them at once is rare, and we will tell you honestly which ones your building can reach.
| Adder | Value | What it takes |
|---|---|---|
| Domestic content | +10% | All steel and iron made in the United States, plus a threshold share of manufactured product cost from domestic sources. Requires cost certification documentation from the installer. |
| Energy community | +10% | The project site sits in a designated brownfield, a former coal closure area, or a statistical area with qualifying fossil fuel employment history. Determined by location and verified against the Department of Energy mapping tool. |
| Low-income community | +10 to 20% | Application and allocation based, capacity limited, and generally restricted to smaller projects. Not something to assume in a base case. |
All steel and iron made in the United States, plus a threshold share of manufactured product cost from domestic sources. Requires cost certification documentation from the installer.
The project site sits in a designated brownfield, a former coal closure area, or a statistical area with qualifying fossil fuel employment history. Determined by location and verified against the Department of Energy mapping tool.
Application and allocation based, capacity limited, and generally restricted to smaller projects. Not something to assume in a base case.
Prevailing wage and apprenticeship
For projects at or above one megawatt, the 30 percent base credit is conditional. Fail the prevailing wage and apprenticeship requirements and the credit drops to 6 percent. Projects under one megawatt are generally exempt from this test, which covers most of the commercial work we do.
Foreign entity sourcing rules
Projects beginning construction from January 1, 2026 onward must meet a material assistance cost ratio, which sets a minimum share of equipment cost from non-restricted sources. Fail it and the project does not qualify for the credit at all, regardless of timing.
This is an equipment selection issue, and it is one we manage at the procurement stage. It is also a reason to be skeptical of a bid that comes in unusually low on hardware.
Depreciation
Depreciation is the second half of the math
Commercial solar is five-year MACRS property. On top of that, the One Big Beautiful Bill Act made 100 percent first-year bonus depreciation permanent for qualifying property acquired after January 19, 2025. That means a business with sufficient taxable income can deduct the full depreciable basis of the system in year one instead of spreading it across five.
One adjustment applies: when you claim the ITC, you reduce the depreciable basis by half the credit value. So a project claiming a 30 percent credit depreciates 85 percent of the system cost, not 100 percent.
California businesses: an important difference
California does not conform to federal bonus depreciation and never has. Any bonus depreciation you claim federally must be added back on the California return, and the asset is depreciated over its full life on California's own schedule.
This does not reduce the federal benefit. It does mean your California and federal taxable income will diverge in the first year, and your CPA needs to plan for it. Arizona businesses should confirm current state conformity with their tax advisor, since several states have decoupled since the OBBBA passed.
Depreciation
Storage runs on a different clock
Energy storage was largely spared from the solar phase-out. Standalone batteries and batteries paired with solar remain eligible for the Section 48E credit for projects beginning construction through 2033, with a phase-down after that.
That has two consequences for a commercial building.
- Storage added to a solar project before the 2027 solar deadline increases the credit-eligible basis of the overall project.
- A building that misses the solar window entirely can still install storage and claim a federal credit for years afterward.
Under both California net billing and Arizona net billing, exported solar earns well below the retail rate. Storage is what lets you keep that energy and use it against your own peak-rate consumption and your demand charges instead of selling it back cheaply. For most commercial buildings in our service area, storage is no longer an upsell. It is what makes the economics work.
The foreign entity sourcing rules apply to storage as well, so battery selection matters here for the same reason it matters on the solar side.
Tax-Exempt Organizations
If your organization does not pay federal income tax
A tax credit is worthless to an entity with no tax liability. Elective pay, sometimes called direct pay, solves that.
Tax-exempt and governmental entities can claim the Section 48E credit and receive it as a cash payment from the IRS rather than as an offset. That covers:
School districts and public universities
Municipalities, counties, and government agencies
Nonprofits and houses of worship
Tribal governments and rural electric cooperatives
Public hospitals
Two requirements deserve attention. Elective pay projects must complete IRS pre-filing registration before the return is filed, and that registration takes time. And for elective pay projects placed in service in 2026 or later, domestic content standards carry more weight than they do on the standard credit path, which affects equipment selection from day one.
For-profit businesses with limited tax appetite
Elective pay does not apply to for-profit entities. If your business cannot absorb the full credit against current liability, the credit can be carried forward, or it can be sold to another taxpayer under the transferability provisions in Section 6418. Both are viable. Which one makes sense depends on your tax position, and it is a conversation for your CPA rather than your solar installer.
State Programs
California
California has high commercial electricity rates and aggressive clean energy policy, but it has never had a state solar income tax credit. Be skeptical of anyone who tells you otherwise. What California offers instead is a property tax exclusion, a rate structure that rewards storage, and financing mechanisms.
Active Solar Energy System Exclusion
Adding a solar energy system to a commercial property would normally trigger a reassessment and a higher property tax bill. The Active Solar Energy System Exclusion prevents that. The added value of a qualifying system is excluded from assessed value.
This is the most time-sensitive item on the page. Under current law the exclusion applies to qualifying systems installed by December 31, 2026, with the statute set to sunset January 1, 2027. Unless the Legislature extends it again, a system completed after that date does not get the exclusion.
Self-Generation Incentive Program
SGIP has been California's flagship storage rebate for two decades, and we want to be straight with you about its current state. The general market and equity ratepayer-funded budgets closed to new applicants at the end of 2025, and no new ratepayer collections were authorized after that date. The remaining active pathway is income-qualified and residential, and it is waitlisted.
If a commercial pathway reopens, we will tell you. We will not build an SGIP rebate into your project economics unless the funding is confirmed and reserved.
Net billing and demand charges
Commercial customers of SDG&E, SCE, and PG&E operate under the net billing tariff, often called NEM 3.0. Exported energy is credited at avoided cost rates, which run far below what you pay for the same kilowatt-hour. The value of a commercial solar system in California now comes primarily from offsetting your own consumption, not from selling power back.
Demand charges are the other half of the picture. For many commercial accounts, demand charges are a larger line item than energy charges, and solar alone does very little to reduce them. A correctly sized and controlled battery does. This is where the difference between a competent commercial design and a residential-style design shows up on your bill.
C-PACE financing
Commercial Property Assessed Clean Energy financing lets a property owner fund the full system cost with repayment through the property tax assessment, over terms long enough to be cash-flow positive from the first year in many cases. It is not an incentive, but it changes who can move forward without capital expenditure approval. Availability depends on your county having an active program.
What California does not offer
There is no California state income tax credit for solar. There is no statewide sales tax exemption for solar equipment, so standard state and local sales tax applies to your purchase.
State Programs
Arizona
Arizona's commercial incentive stack is leaner than California's and the honest framing is that the federal credit does most of the work. What Arizona does well is keep the state from taking a cut on the way in and on the way through.
Transaction privilege tax exemption
Arizona exempts qualifying solar energy devices from transaction privilege tax under the retail and prime contracting classifications. The exemption applies to the device itself. Labor, permit fees, and non-solar components may still be taxable depending on how the contract is structured and classified, and some municipalities levy local taxes that apply separately. Your proposal will show how this is applied.
Property tax treatment
How Arizona values your system for property tax purposes depends on what you do with the power.
| System type | Treatment |
|---|---|
| Behind the meter, powering your own facility | Treated as adding no value for property tax purposes. This covers the large majority of commercial rooftop and carport projects. |
| Power sold on site to tenants or third parties, or otherwise not for self-consumption | Valued under a separate statute at twenty percent of depreciated cost, with taxable original cost reduced by the value of claimed tax credits. |
If your project involves selling power to tenants, this distinction changes your model. It is worth raising early rather than at closing.
The Arizona commercial solar tax credit that no longer exists
You will find Arizona installer websites advertising a commercial and industrial solar energy tax credit worth ten percent of installed cost, capped at $25,000 per building and $50,000 per business per year. It was a real program. Arizona Commerce Authority certification for it ended after tax year 2018, and the state tax form for it has not been issued since form year 2023, which lines up with the end of the five-year carryforward tail.
It is not available to a new Arizona commercial project. If a competitor put it in your proposal, that number is wrong and your financial model is overstated.
Net billing across APS, SRP, and TEP
All three major Arizona utilities have moved off full retail net metering to export credit rates well below retail. SRP additionally applies demand-based pricing to solar customers, which makes battery storage close to mandatory for a workable commercial return in that territory. APS and TEP customers have better standalone solar economics but still benefit substantially from storage.
Utility program terms change on filing cycles rather than calendar years. We verify your specific rate schedule and export rate as part of the proposal rather than quoting a general figure.
A note on Arizona battery programs
The APS Storage Rewards pilot and the SRP Battery Partner program are frequently cited as Arizona battery incentives. Both are currently structured as residential pilot programs.
If a commercial equivalent opens in either territory, we will bring it to you.
Rural and Agricultural
Rural and agricultural operations
The USDA Rural Energy for America Program provides grants and guaranteed loans to agricultural producers and rural small businesses. Grant cost share can reach a meaningful share of eligible project cost, and REAP funding stacks with the federal tax credit.
Two caveats we would rather give you now than later. Grant application windows have been paused and reopened repeatedly, and USDA has signaled tighter treatment of ground-mounted solar on productive farmland. Loan guarantee applications have continued to be accepted on a rolling basis.
Our recommendation for agricultural clients is to model your project so that it works without a REAP grant, then treat an award as upside. Building a grant into your base case creates schedule risk against a federal deadline that does not move.
Putting It Together
How this stacks in practice
The order matters, because some of these interact.
Start with the deadline
Work backward from December 31, 2027 through interconnection, inspection, construction, permitting, and design to find your real decision date.
Establish the base credit
Thirty percent of qualifying cost, subject to sourcing compliance and, for larger projects, labor requirements.
Test the adders
Location determines the energy community adder. Equipment selection determines domestic content. Both are decided before procurement, not after.
Layer depreciation
Reduce the basis by half the credit, then apply first-year bonus depreciation against your actual taxable income. California filers plan for the state addback.
Apply state and local treatment
The California property tax exclusion or the Arizona property tax and transaction privilege tax treatment, depending on where the building sits.
Size storage against your rate structure
Demand charges and time-of-use spreads, not export credits, drive the storage case.
Choose how you pay for it
Capital purchase, C-PACE, or third-party ownership. Ownership structure determines who claims the credit, so decide this before you sign.
SolarTech runs this analysis for your specific building, utility account, and tax position before you commit to anything. The output is a financial model you can hand to your CFO or your CPA, with the assumptions shown rather than buried.
Ready to Transform Your Commercial Property?
Get straight answers on cost, timeline, incentives, and what to expect. No commitment, no sales pressure.
- 100% In-House Installation
- 25-Year Solar Warranties
- Serving businesses since 2001
Prefer To Talk? Give us a Call
(619) 743 9193
Frequent Questions About Commercial Solar Incentives
The questions our commercial team gets asked most often, answered as of August 2026.
Contact SolarTech Support
Phone
(619) 743 9193
sales@solartechonline.com
Is the federal solar tax credit still available for businesses in 2026?
Yes. The 30 percent Section 48E credit remains available for commercial projects. The constraint is timing rather than rate. A project that began construction on or before July 4, 2026 is safe-harbored with a four-year completion window. A project starting after that date must be placed in service by December 31, 2027 to claim anything.
What happened to the residential solar tax credit?
The Section 25D residential credit expired for expenditures after December 31, 2025. It does not affect commercial projects, which fall under a different section of the code. Third-party owned residential systems may still access the commercial credit through the system owner.
Does Arizona have a commercial solar tax credit?
Not for new projects. The Arizona commercial and industrial solar credit ended after tax year 2018 and has not been renewed. Arizona businesses still benefit from the transaction privilege tax exemption on solar devices and favorable property tax treatment for behind-the-meter systems.
Does California have a state solar tax credit?
No. California has never offered a state solar income tax credit. Its incentives take the form of the property tax exclusion, utility rate structures, and financing programs.
What is solar tenant billing and how does it work?
Can I still get an SGIP rebate for a commercial battery?
Not currently. The general market SGIP budgets closed to new applicants at the end of 2025. We will not include an SGIP rebate in your project economics unless funding is confirmed and reserved for your project.
My organization is a nonprofit. Can we benefit?
Yes, through elective pay. Tax-exempt and governmental entities can receive the 30 percent credit as a cash payment from the IRS rather than as a tax offset. There is an IRS pre-filing registration step that needs to start early, and domestic content requirements carry more weight on this path.
What does "begin construction" actually mean?
It is a defined tax concept, established either through physical work of a significant nature or through incurring a qualifying share of project cost. The rules around it have been actively litigated and revised. If your project timing depends on it, that determination belongs with your tax advisor, and we will provide the documentation they need.
Can incentives be combined?
Yes, with sequencing rules. The federal credit, depreciation, state property tax treatment, and financing mechanisms generally stack. Some rebates reduce the cost basis used to calculate the federal credit, so the order of operations affects the total. That is exactly the kind of thing our commercial financial model accounts for.