The federal solar tax credit is the single largest financial lever most homeowners have when paying for a solar energy system. Yet despite years of media coverage, it remains widely misunderstood — confused with a deduction, mis-applied to leased systems, or mistakenly assumed to phase out faster than it actually does. This guide walks through how the credit works in 2026 under the Inflation Reduction Act (IRA), what qualifies, who can claim it, and how to actually file for it.

What the Federal Solar Tax Credit Is in 2026

The federal solar tax credit — formally called the Residential Clean Energy Credit (Internal Revenue Code Section 25D) — is a non-refundable tax credit equal to 30% of the cost of a qualifying clean energy system installed on a U.S. residence. The 30% rate is fixed under the IRA through the end of 2032, then steps down to 26% in 2033 and 22% in 2034 before expiring at the end of 2034 for residential systems.

This is a credit, not a deduction. A deduction lowers your taxable income; a credit lowers your tax bill dollar-for-dollar. If you owe $9,000 in federal income tax and you have a $6,000 solar credit, your final bill is $3,000. That distinction matters more than almost any other detail in this guide.

The credit is also uncapped. There is no maximum dollar value. A $25,000 system generates a $7,500 credit; a $90,000 system with battery storage generates a $27,000 credit. The IRS does not care how large the install is, only that it qualifies and that you have sufficient tax liability to absorb it (more on that below).

What Equipment Qualifies

The IRS publishes the qualifying categories in IRS Form 5695 instructions and Section 25D. For 2026, qualifying expenses include:

  • Solar photovoltaic (PV) panels — the modules themselves
  • Inverters — both string inverters and microinverters
  • Racking, mounts, and balance-of-system components
  • Wiring, conduit, monitoring hardware, and permitting fees
  • Labor costs for on-site preparation, assembly, and installation
  • Sales tax on eligible equipment
  • Battery storage systems with a capacity of 3 kWh or greater — this includes standalone batteries added to an existing PV system, a rule clarified by the IRA in 2023
  • Solar water heating systems that are certified by the Solar Rating Certification Corporation (SRCC) or a comparable state-endorsed body, provided at least half of the energy used to heat the water comes from the sun
  • Geothermal heat pumps, small wind turbines, and fuel cell property (with separate caps for fuel cells)

What does not qualify: roof repairs or full roof replacements that aren’t structurally necessary for the install, extended warranties purchased separately, and any equipment used for a swimming pool or hot tub. The U.S. Department of Energy maintains broader background on eligible technologies in its Homeowner’s Guide to the Federal Tax Credit.

Owned vs Leased: The Single Most Important Distinction

You must own the system to claim the credit. This is the most common point of confusion in solar sales conversations.

  • Cash purchase → you own it → you claim the credit.
  • Solar loan → you own it → you claim the credit (the loan principal is irrelevant to the IRS; what matters is the system cost).
  • Lease or Power Purchase Agreement (PPA) → the installer or third-party financier owns the panels → they claim the credit, not you. They may pass some of the value through to you in the form of lower monthly payments, but you cannot claim it on your own return.

If a sales rep tells you that you can claim the tax credit on a leased system, that is wrong and you should be skeptical of anything else they tell you. For more on how lease vs ownership affects long-term value, see our guide to calculating solar ROI.

Who Qualifies as a Taxpayer

To claim the credit, you must meet three conditions:

  1. You owe federal income tax. Because the credit is non-refundable, it can only zero out tax you owe — it cannot generate a refund beyond taxes paid. If your federal tax liability for the year is $4,000, you can only use $4,000 of the credit in that year.
  2. The system is installed at a residence you use in the United States. This includes primary residences and second homes (vacation homes qualify, though rental properties used 100% as rentals do not — partial-use rentals get a proportional credit).
  3. The system was placed in service during the tax year you are claiming. “Placed in service” generally means inspected, interconnected, and ready for use — not just delivered.

You do not need to itemize deductions to claim the credit. It works whether you take the standard deduction or itemize.

The Carryforward Rule

What happens if your credit exceeds your tax liability? You don’t lose it. The unused portion carries forward to subsequent tax years, indefinitely under current law (or at least through the 2034 expiration of the credit itself). So if you have a $9,000 credit but only $4,000 of tax liability this year, you claim $4,000 now, and the remaining $5,000 rolls forward to next year.

This is why some retirees with low taxable income still benefit from solar — they may spread the credit across multiple tax years until it’s fully used.

How to Claim It: Form 5695

The credit is claimed on IRS Form 5695, Residential Energy Credits, filed with your federal return for the tax year the system was placed in service. The mechanics:

  1. Calculate your total qualified solar electric property costs (the sum of all eligible expenses listed above).
  2. Multiply by 30% to get your tentative credit.
  3. On Part I of Form 5695, enter the costs and the credit calculation.
  4. Compare the credit to your tax liability from Form 1040 (using the Credit Limit Worksheet in the Form 5695 instructions).
  5. Enter the allowed amount on Schedule 3, Line 5a, which flows to your 1040.
  6. If there’s a carryforward, note it for next year’s Form 5695.

Keep your installer’s itemized invoice, any permit and inspection documentation, and proof of payment with your tax records. The IRS does not require these to be filed with the return, but they are what you’ll produce in the event of an audit.

Stacking With State and Utility Incentives

The federal credit stacks with most state and utility incentives, but the order of operations matters and varies by state. The U.S. Department of Energy’s DSIRE database is the authoritative source for state-by-state programs.

Common stacking patterns:

  • State income tax credits (e.g., New York, South Carolina, Massachusetts) — typically claimed on your state return; the federal credit is calculated on full system cost regardless.
  • State rebates — these usually reduce the system cost basis used for the federal credit. If you paid $30,000 and received a $3,000 state rebate, your federal credit is calculated on $27,000, not $30,000.
  • Utility rebates — same treatment as state rebates in most cases.
  • Net metering — does not affect the credit; this is an ongoing bill credit, not an upfront subsidy.
  • Renewable Energy Credits (SRECs) — sold separately as income; do not reduce the federal credit basis but may be state-taxable.

This is the area where homeowners most often miscalculate their net cost. The U.S. Energy Information Administration (EIA) publishes state-level retail electricity rates that you’ll need separately for ROI math, but the rebate-reduces-basis rule is the one to remember at tax time.

Common Mistakes to Avoid

  • Claiming the credit before the system is placed in service. A signed contract and a deposit are not enough. Wait for interconnection.
  • Claiming labor costs for a roof replacement. Only structural work directly necessary for the solar install qualifies — full reroofs do not, even if you did them at the same time.
  • Forgetting the battery. If you added a battery in a separate year from the original PV install, it still qualifies on its own — file Form 5695 for that year.
  • Assuming the credit applies to your state return. Many states have a parallel credit, but it’s claimed separately on the state return using a state-specific form.

For more on planning the system itself before you get to the tax question, our installation walkthrough covers what to expect from quote through interconnection.

Frequently Asked Questions

Is the federal solar tax credit refundable in 2026? No. It is non-refundable, meaning it can reduce your federal tax liability to zero but cannot generate a refund larger than the taxes you actually owe. Unused credit carries forward to future tax years.

Can I claim the credit on a vacation home or second home? Yes, if you use it as a residence. Pure rental properties don’t qualify under Section 25D; they fall under the commercial ITC (Section 48) instead, which has different rules.

Does the 30% apply to the cost before or after a state rebate? After. State and utility rebates typically reduce the system cost basis used for the federal credit. State income tax credits, however, do not reduce the federal basis.

What if I install solar in 2026 and add a battery in 2028? Each project gets its own 30% credit in the year it is placed in service. File Form 5695 for both years.

Will the 30% credit really last through 2032? Under current law, yes. The IRA fixed the 30% rate through 2032, with step-downs to 26% in 2033 and 22% in 2034. Future legislation could change this, but as of the 2026 filing season the schedule is intact.