Solar Investment Tax Credit
A US federal tax credit that lets owners of a new solar installation deduct a percentage of the system's cost from their federal income tax liability, currently 30 percent of total installed cost for residential and commercial systems under the Inflation Reduction Act framework.
The Solar Investment Tax Credit is the single most consequential incentive in the US residential and commercial solar market. It lowers the effective cost of a system by 30 percent in tax savings, which means a 25,000 USD installation nets out to 17,500 USD after the credit is claimed. For a commercial project at 1 million USD installed, the credit is 300,000 USD. Any proposal that ignores or incorrectly models the ITC misstates the true cost of solar by a wide margin.
The credit has two legal bases depending on buyer type. Residential customers claim the Residential Clean Energy Credit under Internal Revenue Code Section 25D, which applies to systems placed in service on their primary or secondary residence. Commercial systems, whether roof-mounted, ground-mounted, or utility scale, claim the Investment Tax Credit under Section 48. The Inflation Reduction Act of 2022 set the base rate at 30 percent through 2032, with step-downs scheduled thereafter, and introduced adders for domestic content, energy community siting, and low-income communities that can push commercial projects toward 50 or 60 percent effective credit.
Practical consequences for a proposal
The credit is non-refundable, which means it only reduces tax owed. A retiree with minimal federal tax liability may not be able to use the full credit in year one, though residential filers can carry the unused portion forward. A proposal that promises 30 percent savings to a low-tax-liability customer without checking their actual position is setting up a difficult post-install conversation.
Commercial and utility developers treat the ITC as a financeable asset through tax equity transactions. The credit gets monetized by a tax-equity investor, the proceeds flow into the project, and the developer captures a portion of the credit value in cash rather than in reduced tax.
Why it matters for solar installers
The installers who model the ITC correctly, and who can explain it to a customer in 60 seconds, close more residential deals than installers who treat it as fine print. Misapplying the credit in a proposal, or overpromising eligibility, creates a liability that surfaces at tax time. SolarVis applies the current federal and state incentive math inside the proposal, so reps sell the real savings, not an estimate.
Common questions
- Who can claim the solar ITC?
- The owner of the solar system at the time it is placed in service. That means homeowners who buy the system with cash or a loan, commercial property owners who own their system, and third-party financiers who own leased or PPA systems. Customers on a lease or PPA do not claim the credit because they do not own the hardware, the financier captures the benefit and prices the monthly payment accordingly.
- What costs count toward the ITC basis?
- Qualified costs include modules, inverters, balance-of-system, labor, permitting fees, engineering, and associated battery storage charged from the solar system. Roof repairs or structural work unrelated to the solar installation do not count. The IRS publishes specific guidance on eligible costs each year.
- Is the solar ITC a deduction or a credit?
- A credit. It reduces tax liability dollar for dollar, not proportionally to the marginal tax rate. A 10,000 USD credit saves 10,000 USD in taxes, which is why the ITC is dramatically more valuable than a deduction of the same face value.
