Learn About the Federal Solar Tax Credit

Overview of the Federal Solar Investment Tax Credit

The Federal Solar Investment Tax Credit (ITC), also called the solar tax credit, allows property owners to deduct a percentage of their solar installation costs from their federal income taxes. This credit has been a major part of U.S. solar policy since 2006 and has helped drive significant growth in the solar industry. According to the Solar Energy Industries Association, the solar tax credit has contributed to the installation of millions of residential and commercial solar systems across the country.

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The way the credit works is straightforward: when you install a solar photovoltaic (PV) system on your home or business, you can claim a percentage of the total installation costs as a credit against your federal income tax liability. A tax credit is different from a tax deduction. While a deduction reduces the amount of income you pay taxes on, a credit directly reduces the amount of taxes you owe, dollar for dollar. This makes the solar tax credit particularly valuable.

The credit percentage has changed over time due to congressional legislation. As of 2024, the credit covers 30% of qualified installation costs for residential and commercial systems. This percentage is set to step down in future years under current law: 26% in 2033, 22% in 2034, and the credit is scheduled to expire for residential systems after 2034 (though it will continue at 22% for commercial systems indefinitely). These phase-down dates are important to understand when considering a solar installation.

The solar tax credit applies to several types of solar installations. The most common is roof-mounted or ground-mounted photovoltaic systems that convert sunlight into electricity. The credit also covers solar water heating systems that use the sun's energy to heat water for household or commercial use. Battery storage systems that work with solar installations have also become covered under recent expansions of the credit.

Practical Takeaway: The solar tax credit reduces your federal income tax bill by a percentage of what you spend on a solar system. Understanding that this is a tax credit (not a deduction) helps you recognize its true financial value. Knowing the current percentage and future phase-down schedule helps you make an informed timeline for any solar investment decision.

Who Can Use the Solar Tax Credit

The solar tax credit is available to a broad range of property owners, though specific rules determine who can claim it. Homeowners who own residential solar systems installed on their primary residence can generally claim the credit. This includes single-family homes, condominiums, and cooperative housing units. Renters cannot claim the credit on systems they don't own, though some states and utilities offer other solar incentive programs for renters.

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Business owners and commercial property owners can also claim the solar tax credit. This includes farms, office buildings, warehouses, factories, and other commercial structures. Non-profit organizations, schools, and government entities face different rules and may have other incentive options available through state and local programs instead of the federal tax credit.

To claim the solar tax credit, you must have federal income tax liability. This means you need to owe federal income taxes in the year you claim the credit. If you have little or no federal tax liability, you cannot use the full credit in that year, though unused credits may be carried forward to future tax years. This is an important distinction: the credit has value only if you have taxes to offset.

The property where the solar system is installed must be located in the United States for the credit to apply. This includes the 50 states, the District of Columbia, and some U.S. territories. The system must be new or newly installed—used or previously installed systems do not qualify. The credit applies only to the original installation of the system at a property.

You must own the solar system to claim the credit. If you enter into a solar lease or power purchase agreement where a third party owns the system and you simply buy the electricity it produces, you cannot claim the tax credit. The company that owns the system would claim the credit instead. This ownership distinction is critical when comparing financing options for going solar.

Practical Takeaway: As a homeowner or business owner who owns your solar system outright, you may use the tax credit if you have federal tax liability. Check whether you own or lease your system, as ownership determines who gets the credit benefit. If you lack sufficient tax liability to use the full credit in one year, the unused portion can be carried to future years.

What Costs Are Covered by the Solar Tax Credit

The solar tax credit covers the costs directly associated with purchasing and installing your solar system. This includes the solar panels themselves, the inverter (the device that converts DC electricity from the panels into AC electricity for your home), mounting hardware, wiring, and labor costs for installation. The IRS provides a detailed list of components that count toward the credit calculation.

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The credit calculation is based on the total installed cost of your system. This means you add up everything you paid for the equipment and installation, then take the applicable percentage (currently 30%) of that total. For example, if your solar system costs $15,000 installed, you would calculate 30% of $15,000, which equals a $4,500 tax credit. This $4,500 would then reduce your federal income tax liability.

Battery storage systems connected to solar installations are now covered under the solar tax credit expansion. If you add a battery system to store energy generated by your solar panels, the cost of that battery storage equipment and installation can be included in the credit calculation. This has become increasingly common as battery prices have declined and homeowners seek energy independence and backup power options.

There are some important exclusions to understand. The credit does not cover routine maintenance costs, repairs, or replacements of existing systems. If your system is damaged and needs repair, that repair cost is not covered. The credit also does not include costs for site preparation that is not directly related to the solar installation, such as roof repairs that would be needed regardless of the solar installation (though if your roof needs replacement as part of the solar installation process, that replacement cost may be covered).

Sales taxes included in your purchase and installation costs can be counted toward the total installation cost that the credit is calculated on. Labor costs for installation, electrical work, and permitting are included. If you purchase the system using financing or a loan, the credit is based on the total equipment and installation cost, not just the down payment you made.

Practical Takeaway: Gather your solar installation invoice and itemize all costs—panels, inverters, wiring, labor, and sales tax. Multiply this total by 30% (the current credit percentage) to see your estimated tax credit. Make sure you understand which costs are included and excluded so you can properly calculate your expected benefit.

How to Claim the Solar Tax Credit on Your Tax Return

Claiming the solar tax credit involves completing IRS Form 5695, "Residential Energy Credit," for residential solar installations. This form is attached to your main tax return (Form 1040). The form asks for information about your solar system, including when it was placed in service (when the installation was completed and the system became operational), the total cost, and the amount of the credit you are claiming. You will need details from your solar installation contract and invoice to complete this form.

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For commercial solar installations, you use different IRS forms depending on the type of property and business structure. The most common form is Form 3468, "Investment Credit," which captures various types of investment credits, including the solar ITC. Commercial installations require more detailed documentation, and the rules are more complex, so many businesses work with tax professionals to claim the credit correctly.

You must have documentation to support your claim. This includes your solar installation contract, the itemized invoice showing all costs, proof of payment, and documentation showing when the system was placed in service. The IRS does not require you to attach these documents to your tax return, but you should keep them for your records in case of an audit. The solar installer typically provides much of this documentation.

If you have unused tax credit—meaning your system cost more than your total federal tax liability for the year—you can carry the unused portion forward to use in future tax years. For example, if you have a $4,500 credit but only $3,000 of federal tax liability, you have $1,500 of unused credit. You can claim that $1,500 on your tax return in the following year. This carryforward can continue indefinitely until the credit is used or the system is no longer in service.

Many people choose to work with a tax professional—a certified public accountant (CPA) or tax preparer—when claiming the solar tax credit. These