The federal solar tax credit is a one-time credit per installation, but you can claim it once for each separate solar system you install

The Investment Tax Credit (ITC) for residential solar lets you deduct 30 percent of your installation costs from your federal income taxes. You claim it once per system. If you install solar panels on your home in 2024, you get the credit on that year's tax return. You cannot claim the same credit again for those same panels in a future year.

However, the rule is per installation, not per household. If you later install a second solar system — on a different building you own, or as an upgrade to a separate structure — you can claim the credit again for that new system. The credit applies to the year you place the system in service, meaning the year it is fully installed and operational.

The credit percentage itself changes over time by law. Through 2032, the rate is 30 percent. After 2032, it steps down to 26 percent (2033), then 22 percent (2034), then expires. This affects how much you can deduct, but does not change the one-time-per-system rule.

Key Takeaways

  • You claim the solar tax credit once for each solar installation, in the tax year the system is placed in service.
  • If you install a second separate solar system on another property you own, you can claim the credit again for that system.
  • The credit covers 30 percent of installation costs through 2032, then decreases in later years.
  • You cannot carry forward unused credit to future years if your tax liability is too low in the year you install the system.

What counts as a separate installation

The IRS treats each solar system as its own installation. If you add panels to an existing system later, that expansion is generally considered part of the original system and does not may have access to for a second credit. The key distinction is whether the new panels are connected to the same inverter and electrical setup as the original system.

If you own multiple properties and install solar on each one, each property's system is a separate installation. You can claim the credit for the solar system on your primary residence, then claim it again for solar on a rental property, a vacation home, or a detached garage with its own system. Each gets its own 30 percent deduction.

What happens if your tax bill is too low to use the full credit

The solar tax credit is non-refundable, meaning if the credit is larger than the taxes you owe that year, you lose the excess. You cannot get the unused portion as a refund. For example, if your installation costs $20,000 and the credit is $6,000, but you only owe $4,000 in federal taxes, you can only deduct $4,000. The remaining $2,000 is gone.

Some states offer their own solar credits or rebates that work differently, so check your state's rules. A few states have refundable credits, but the federal ITC does not. If you expect a low tax year, you might time your installation for a year when your income is higher, though this requires planning with your tax situation in mind.

How the credit works with other solar incentives

The federal tax credit stacks with other incentives. You can claim the ITC and also receive state rebates, utility company rebates, or performance-based incentives. Some states offer their own tax credits on top of the federal one. The federal credit is calculated on your total installation cost, including labor and equipment, before subtracting any rebates you receive from other sources.

If a utility company gives you a $2,000 rebate, you subtract that from your cost before calculating the federal credit. So a $20,000 system with a $2,000 rebate becomes a $18,000 basis for the 30 percent federal credit, which is $5,400. You still get both the rebate and the credit — they just do not double-count the same dollars.

Who can claim the solar tax credit

You must own the solar system to claim the credit. If you lease solar panels or use a power purchase agreement (PPA), the leasing company or solar company claims the credit, not you. Some leasing companies pass savings to you through lower monthly payments, but you do not claim the tax credit yourself.

You also must have a tax liability to claim it. If you owe no federal income tax that year, you cannot use the credit. Renters cannot claim it because they do not own the system. If you are married and file jointly, either spouse can claim the credit on your joint return.

Timing: when you claim the credit on your tax return

You claim the solar tax credit on the tax return for the year the system is placed in service. "Placed in service" means the system is fully installed, inspected, and operational — not the year you signed the contract or paid the installer. If your solar panels are installed and turned on in June 2024, you claim the credit on your 2024 tax return, filed in 2025.

You will need documentation from your installer showing the installation date and total cost. Keep receipts and the IRS Form 5695, which is where you report the credit. Your tax software or tax preparer will guide you through entering the information, but you must provide the cost breakdown and installation date.

State solar tax credits and how they differ

Some states offer their own solar tax credits separate from the federal one. Massachusetts, New York, and a few others have state-level credits that work similarly — you claim them once per system on your state tax return. A handful of states offer refundable credits, meaning you can get money back if the credit exceeds your tax bill. Check your state's tax authority website to see whether your state has a solar credit and whether it is refundable.

State credits are typically smaller than the federal 30 percent, often in the range of 5 to 10 percent. Some states have phased out their credits as the federal credit became more generous. If your state does offer one, you claim both the federal and state credits on their respective returns in the same year.

Frequently Asked Questions

Can I claim the solar tax credit twice if I install panels in two different years?

No, not for the same system. You claim the credit once, in the year the system is installed. If you install a completely separate solar system on a different property you own, you can claim the credit for that new system in the year it is placed in service. But you cannot claim the same credit twice for the same panels.

What if I sell my home after installing solar — can the new owner claim the credit?

No. The credit belongs to the person who owned the system when it was installed and placed in service. If you install solar in 2024 and sell the home in 2025, you claim the credit on your 2024 return. The new owner cannot claim it. The credit does not transfer with the property.

Does the solar tax credit expire if I do not use it all in one year?

The credit does not expire, but it is non-refundable. If you cannot use the full credit because your tax bill is too low, the unused portion is lost — you cannot carry it forward to future years. This is different from some other tax credits that allow carryforward. Plan your installation year around your expected tax liability if possible.

If I add more panels to my existing solar system later, can I claim the credit again?

Typically no. An expansion of an existing system is treated as part of the original installation. However, if you install a completely separate system with its own inverter and electrical connection, that may may have access to as a new installation. Consult your tax preparer or the IRS about your specific situation, as the rules depend on how the systems are wired.

Can I claim the solar credit if I lease my solar panels?

No. You must own the system to claim the credit. If you lease panels or use a power purchase agreement, the solar company owns the system and claims the credit. You may benefit through lower lease payments, but you do not claim the tax credit yourself.