The solar tax credit cuts your federal income tax dollar-for-dollar

The Investment Tax Credit (ITC) for solar lets you subtract a percentage of what you spent on a home solar system directly from your federal income taxes. If you paid $10,000 for panels and installation, and the credit is 30 percent, you reduce your tax bill by $3,000. You do not get a refund if the credit is larger than what you owe — instead, you carry the unused amount forward to future years.

The credit applies to the total cost of the system: panels, inverter, wiring, labor, and installation. It does not cover financing costs, property taxes, or insurance. You claim it on IRS Form 3468 when you file your return for the year the system was installed and operational.

The percentage changes by year. As of 2024, the credit is 30 percent of your total system cost. That rate steps down to 26 percent in 2025 and 22 percent in 2026, then expires unless Congress extends it. The rate that applies is the one in effect when your system is placed in service — the year it starts generating power, not the year you signed the contract.

Key Takeaways

  • The solar tax credit is a dollar-for-dollar reduction in your federal income tax, calculated as a percentage of your total system cost including installation.
  • The credit percentage is 30 percent through 2024, drops to 26 percent in 2025 and 22 percent in 2026, and is scheduled to expire after that unless Congress acts.
  • You claim the credit on Form 3468 in the tax year your system becomes operational, not when you purchase it or sign a contract.
  • If the credit exceeds your tax liability, you can carry the unused portion forward to reduce taxes in future years rather than receiving a refund.
  • The credit covers panels, inverters, wiring, and labor, but not financing costs, property taxes, or homeowners insurance.

What counts toward the credit amount

The IRS measures the credit against your total out-of-pocket cost for the system. That includes the solar panels themselves, the inverter that converts DC power to AC, mounting hardware, wiring and electrical components, and all labor for installation. If you hire a contractor, their labor is part of the cost basis.

What does not count: interest paid on a loan, property taxes, homeowners insurance, maintenance contracts, or monitoring services. If you lease a system or use a power purchase agreement instead of buying, you cannot claim the credit — only the system owner can. If you own the home and the system, you own the credit.

If you paid for the system in cash, your cost basis is straightforward. If you financed it, your cost basis is the total price you agreed to pay, not the amount you borrowed. The credit is based on what the system costs, not what you paid upfront.

How the credit works if you owe less tax than the credit amount

Suppose your solar system cost $12,000 and the credit is 30 percent — that is a $3,600 credit. But your federal income tax liability for the year is only $2,000. You use $2,000 of the credit to wipe out your tax bill, and you have $1,600 left over.

That unused $1,600 does not disappear and does not become a refund. Instead, you carry it forward to your next tax return. If you owe $2,500 in taxes the following year, you use the remaining $1,600 to reduce that bill to $900. You keep carrying forward any unused amount until the credit is exhausted or it expires.

This carryforward applies indefinitely under current law — there is no deadline to use the credit once you claim it. However, if the credit expires (currently scheduled for after 2026), you cannot claim any remaining unused portion after that date.

Who can claim the credit

You must be the owner of the solar system and the owner of the home where it is installed. If you rent, lease the system, or use a third-party power purchase agreement, the company that owns the system claims the credit, not you. Some solar companies pass savings to customers through lower lease payments, but you do not claim the credit yourself.

You must have enough federal income tax liability to benefit from the credit. If you owe no federal income tax, the credit does not help you that year — though you can carry it forward. Self-employed people, retirees with taxable income, and wage earners all can claim it if they own the system.

There is no income limit to claim the solar tax credit. High earners and low earners are treated the same. There is also no limit on the dollar amount of the credit — if your system costs $50,000, the credit is 30 percent of $50,000.

The year you claim the credit matters

The credit applies in the tax year your system is placed in service — meaning the year it is installed and starts producing electricity. If you install panels in November 2024, you claim the 30 percent credit on your 2024 tax return filed in 2025. If you install in January 2025, you claim the 26 percent credit on your 2025 return.

The contract date, purchase date, or down payment date does not matter. Only the date the system is operational counts. This timing can affect the percentage you receive, so if you are planning an installation near a year-end deadline, confirm with your installer when the system will be placed in service.

If your system is installed but not yet operational by December 31, you cannot claim the credit that year. It carries forward to the year it actually starts producing power.

How to claim the credit on your tax return

You report the solar tax credit on IRS Form 3468, the Investment Credit form. You will need documentation from your installer showing the total cost of the system, the date it was placed in service, and a breakdown of what was included. Keep your contract, invoice, and proof of payment.

On Form 3468, you enter the cost basis of your system and calculate the credit based on the percentage in effect for that year. The form then tells you how much of the credit you can use against your 2024 tax liability and how much carries forward. You attach Form 3468 to your Form 1040 when you file.

If you use tax software, most programs walk you through the questions and calculate the credit for you. If you work with a tax professional, bring your installer's documentation so they have the exact figures. The IRS may request proof of the system cost and installation date if they audit your return.

State and local incentives work separately from the federal credit

Many states and cities offer their own solar rebates, tax credits, or performance-based payments. These are separate from the federal credit and can stack on top of it. Some states offer a state income tax credit similar to the federal one; others offer cash rebates that reduce your upfront cost.

Your installer can usually tell you what state and local programs are available in your area. Some programs require you to reduce your federal cost basis by the amount of any rebate you receive before calculating the federal credit — meaning if you get a $2,000 state rebate, you subtract that from your system cost before applying the 30 percent federal credit. Other programs do not require this reduction. Check the rules for your state.

The federal credit and state incentives do not interfere with each other, but the order in which you apply them can affect your total benefit. Your installer or tax professional can help you understand how to sequence them for your situation.

Frequently Asked Questions

What if I sell my house before I use up the full credit?

The unused credit carries forward to your next tax return, regardless of whether you move. You do not lose it by selling the home. The credit is tied to you as the taxpayer, not to the property. If you still have unused credit years later, you can continue to claim it on future returns until it is exhausted or expires.

Can I claim the credit if I financed the solar system with a loan?

Yes. The credit is based on the total cost of the system, not on how much you paid upfront or how much you borrowed. If you financed $12,000 at 5 percent interest, your cost basis for the credit is still $12,000. The interest you pay on the loan is not part of the credit calculation.

What happens to the credit after 2026?

The credit is currently scheduled to expire after December 31, 2026, unless Congress extends it. If you install a system before the deadline, you can claim the credit in the year it is placed in service, even if that is after 2026. Congress has extended solar incentives before, but there is no may provide it will do so again.

Do I have to claim the credit in the year the system is installed?

No. You claim the credit in the tax year the system is placed in service. If it is installed and operational in 2024, you claim it on your 2024 return. You do not have to claim it immediately — you can claim it whenever you file that year's return, as long as you file before the statute of limitations expires.

Can renters or people who lease solar systems claim the credit?

No. Only the owner of the system can claim the credit. If you lease a system or use a power purchase agreement, the solar company owns it and claims the credit. Some companies pass savings to customers through lower monthly payments, but the customer does not claim the credit on their tax return.