Federal Solar Tax Credit: How to Claim the 30% ITC (2026)

The federal Investment Tax Credit (ITC) is the most valuable solar incentive available to American homeowners. It lets you deduct 30% of your total solar system cost directly from your federal income tax bill — dollar for dollar, not just as a deduction from taxable income.

For an Arizona homeowner installing an average 8 kW system at $17,040, the 30% ITC equals $5,112 in federal tax savings. Combined with the Arizona state solar tax credit and other state incentives, the total incentive package can reduce your out-of-pocket cost by more than 35%.

This guide explains exactly what qualifies, who can claim it, how to calculate your credit, and how to file Form 5695 correctly. For full context on all available incentives, see our complete guide to Arizona solar incentives.

What Is the Federal Solar Tax Credit?

The ITC was first enacted in 2006 and has been extended multiple times since. The Inflation Reduction Act of 2022 extended the credit at 30% through 2032. Here's the full timeline:

Installing in 2026 means you capture the full 30% — the maximum available. Every year you wait costs you a larger portion of potential savings in both foregone credits and rising electricity costs.

What Qualifies for the ITC?

The ITC applies to the total installed cost of your solar energy system, including:

• Solar photovoltaic (PV) panels
• Inverters (string, microinverter, or power optimizer)
• Racking and mounting hardware
• Electrical wiring and conduit
• Installation labor costs
• Permit fees paid as part of installation
• Battery storage (if charged by solar — see below)
• Monitoring systems included in the installation
• Sales tax on equipment (in states that don't exempt it)

Battery Storage and the ITC

Home batteries like the Tesla Powerwall qualify for the full 30% ITC as long as they are charged by solar. A standalone battery not connected to solar does not qualify. If you add a battery to your solar system at the time of installation, the ITC applies to both. If you add a battery to an existing solar system later, it still qualifies as long as it will be charged primarily from solar.

What Does NOT Qualify

• Roof repairs or replacement done before or separate from solar installation
• Standalone battery storage not charged by solar
• Solar water heaters (have their own separate credit program)
• Leased or PPA systems (the installer/owner claims the credit, not you)

Who Qualifies for the Federal Solar ITC?

To claim the ITC, you must meet all of the following:

1. You own the system. If you lease your solar panels or have a Power Purchase Agreement (PPA), you do not qualify — the company that owns the panels claims the credit.
2. The system is at your primary or secondary U.S. residence. Investment properties and rental properties don't qualify for the residential ITC (though there are separate commercial credits).
3. You have federal income tax liability. The ITC is non-refundable — it can reduce your tax bill to $0 but won't generate a refund beyond that. Any unused credit carries forward to future years (see below).
4. The system is new. Used or previously-installed equipment doesn't qualify.

How to Calculate Your ITC Amount

The calculation is straightforward: multiply your total eligible system cost by 30%.

What If Your Credit Exceeds Your Tax Liability?

The ITC is non-refundable, meaning it can reduce your federal tax bill to zero but won't generate an additional refund. However, unused credit can carry forward to future tax years until it's fully used — with no limit on how many years.

Example: You owe $3,000 in federal taxes this year, but your ITC is $5,112. You claim $3,000 this year (bringing your tax bill to $0) and carry forward the remaining $2,112 to apply against next year's taxes.

Important: Consult a tax professional if you're unsure whether you'll have sufficient tax liability to use the full ITC in year one. This is especially relevant for retirees with lower income or homeowners who take large deductions.

How to Claim the ITC: IRS Form 5695

You claim the federal solar ITC on IRS Form 5695 (Residential Energy Credits), which is filed with your standard Form 1040 tax return for the year you install your system.

Step-by-Step Guide to Form 5695

1. Gather your documentation: Get a copy of your final installation invoice showing total system cost, your interconnection agreement or Permission to Operate (PTO) letter from your utility, and payment records.
2. Download Form 5695 from IRS.gov or use tax software (TurboTax, H&R Block, etc.) which will guide you through it automatically.
3. Complete Part I — Residential Clean Energy Credit:
   • Line 1: Enter the total cost of your solar electric system
   • Line 6: Multiply by 30% — this is your credit amount
   • Lines 12-14: Calculate any carryforward from prior year and determine amount applied this year
4. Transfer the credit to Form 1040: The credit amount from Form 5695 flows to Schedule 3, Line 5, then to your 1040.
5. Keep records: Retain all installation documents, invoices, and your Form 5695 for at least 3 years.

When to Claim: The "Placed in Service" Date

You claim the ITC in the tax year your system is placed in service — meaning the system is installed, inspected, and you've received Permission to Operate (PTO) from your utility. If your system is installed in December but doesn't receive PTO until January, you claim the credit in the January tax year.

ITC and Arizona State Credits

The federal ITC and Arizona's state solar tax credit are completely independent — you can claim both in the same year. The Arizona credit (25%, capped at $1,000) is claimed on your Arizona state income tax return using Arizona Form 310. Claiming the federal credit doesn't reduce the Arizona credit, and vice versa.

Combined on an $17,040 system: federal ITC ($5,112) + AZ state credit ($1,000) = $6,112 in total tax credits.

Common Mistakes to Avoid

• Claiming on a leased system: Only the system owner qualifies. Read your contract carefully.
• Forgetting to carry forward unused credit: If your tax liability was less than your credit, file Form 5695 again next year with the carryforward amount.
• Missing the placed-in-service requirement: You must have PTO before claiming — not just have panels on the roof.
• Including ineligible costs: Don't include standalone roof repair costs or other non-solar work.
• Not including battery storage: If you added a battery that's charged by solar, include it in the eligible cost.

Does Solar Financing Affect the ITC?

How you finance your solar system affects who gets the tax credit:

• Cash purchase: You claim 100% of the ITC
• Solar loan: You own the system and claim 100% of the ITC (lenders often require you to apply the credit as a lump-sum payment in year 1)
• Lease or PPA: You do NOT claim the ITC — the installer does