Federal Solar Tax Credit 2026: The Complete Guide

What is the federal solar tax credit?

The federal solar tax credit — officially the Residential Clean Energy Credit, and widely called the ITC (Investment Tax Credit) — is a dollar-for-dollar reduction in the federal income tax you owe, equal to a percentage of what you spend installing solar at your home. For systems placed in service in 2026, that percentage is 30%.

The word that matters most is credit. A tax deduction lowers your taxable income, so a $6,000 deduction in the 22% bracket saves you about $1,320. A tax credit lowers your actual tax bill by the full amount, so a $6,000 credit saves you the entire $6,000. That distinction is why the solar ITC is one of the most valuable incentives available to American homeowners — it is effectively the government paying 30% of your system.

The credit applies to systems on your primary residence and, in most cases, a second home you live in part-time (but not a pure rental property you never occupy). It is governed by Section 25D of the Internal Revenue Code and was extended and expanded by the Inflation Reduction Act of 2022, which we cover in our guide to the IRA's solar benefits.

How much is the credit in 2026?

For systems installed and placed in service in 2026, the credit is 30% of your total qualifying cost, with no maximum dollar limit. There is no income cap and no cap on the size of the system. On a typical $21,000 residential system that is a $6,300 credit; on a $40,000 system that includes battery storage, it is a $12,000 credit.

Here is the full schedule written into current law by the Inflation Reduction Act:

Because the rate is scheduled to step down after 2032, installing while the 30% rate is in force locks in the maximum benefit. The difference between a 30% and a 22% credit on a $25,000 system is $2,000 — real money that rewards acting during the full-rate window. Estimate your own figure with the Solar Tax Credit Calculator.

What costs qualify for the credit?

One of the most common misconceptions is that the credit only covers the panels. In reality it covers nearly the entire project. Eligible expenses include:

• Solar panels and PV cells — the core generating hardware.
• Inverters — string inverters, microinverters or hybrid inverters that convert DC to usable AC power.
• Mounting equipment, racking and wiring — everything that physically secures and connects the array.
• Battery storage of 3 kWh or larger — even if installed in a later tax year than the panels.
• Labor costs for on-site preparation, assembly and original installation.
• Permitting fees, inspection costs and developer/permit-runner fees.
• Sales tax charged on eligible equipment.

What does NOT qualify

Knowing the exclusions protects you from over-claiming, which can trigger an IRS adjustment. The credit generally does not cover:

• Roof repairs or a full re-roof. Even if you replace the roof to support panels, structural roofing is considered a home improvement, not solar equipment. A narrow exception can apply to solar shingles that serve double duty as roofing and generation, but ordinary asphalt shingles do not qualify.
• General electrical upgrades that aren't required by the solar installation, such as upgrading your panel for unrelated reasons.
• Extended warranties, monitoring subscriptions and maintenance plans.
• Financing costs such as loan origination or interest — only the system cost qualifies, not the cost of borrowing.

When a cost sits in a gray area — a panel upgrade the utility required for interconnection, for instance — your installer's itemized invoice and a CPA are the right guides. Keep the documentation that ties the expense to the solar project.

How to claim the solar tax credit step by step

Claiming the credit is a once-per-installation process handled at tax time:

1. Gather documentation. Save the itemized invoice, proof of payment, the interconnection/permission-to-operate date, and manufacturer certification statements from your installer.
2. Confirm the year placed in service. You claim the credit for the tax year your system was switched on and ready to use — not necessarily the year you signed the contract or paid a deposit.
3. Complete IRS Form 5695 (“Residential Energy Credits”), Part I. Enter your total qualifying costs; the form computes 30%.
4. Carry the result to Schedule 3 (Form 1040), line 5a, then to your Form 1040. The credit reduces the federal income tax you owe for the year.
5. Track any carryforward. If the credit exceeds your tax liability, Form 5695 calculates the amount that rolls to next year.

Most consumer tax software walks you through Form 5695 automatically — you simply enter the total cost. If your return is complex (a home office, a partial rental, or co-ownership), a CPA is worth the modest fee to get the basis and allocation right.

Non-refundable, but it carries forward

The credit is non-refundable. That means it can reduce your federal tax bill to zero, but it will not send you a check for any amount beyond the tax you actually owe in that year. This is the single most misunderstood feature of the credit, so here is a concrete example:

The unused $2,300 is not lost — it carries forward to future tax years with no expiration through the life of the credit. Very few homeowners forfeit any of it; they simply spread it across two returns if their annual liability is small. Note that ‘tax owed’ means your total liability for the year, not just any balance due in April — withholding you have already paid still counts, and the credit can increase your refund up to the amount of tax you owed.

Timing: placed in service, deposits and multi-year projects

The credit attaches to the tax year your system is placed in service — meaning installed, inspected and able to operate. Paying a deposit in December but switching on in January means you claim the credit on the following year's return. For most homeowners this is a non-issue, but it matters if you are timing a large purchase around an expected change in income or tax liability.

For phased projects — panels this year, a battery next year — each component is claimed in the year it is placed in service. Because the 30% rate is locked through 2032, you can plan a multi-year solar-plus-storage rollout without worrying that the rate will drop between phases. This certainty is a direct result of the Inflation Reduction Act.

The battery angle

A major 2022 change made standalone battery storage of 3 kWh or larger eligible for the full 30% credit, even when it is not charged exclusively by solar and even when added years after the panels. Previously a battery generally had to be charged by your own solar to qualify.

This matters more every year as utilities shift from full-retail net metering toward lower-value net billing, which raises the value of storing your own power instead of exporting it cheaply. If you are weighing storage, the Solar Battery Calculator sizes it and applies the 30% credit, and our battery worth-it guide covers when it actually pays off. On an $11,000 battery, the credit is worth $3,300.

Stacking with state and utility incentives

The federal credit is only the headline. Most states and many utilities offer their own incentives that stack on top of the 30%:

• State tax credits — for example, Hawaii's 35% credit or New Mexico's 10% credit — generally do not reduce your federal credit.
• SREC markets in states like Illinois, New Jersey, Maryland and Pennsylvania let you sell solar renewable energy certificates for years of additional income.
• Upfront utility rebates can, in some cases, reduce the cost basis used to calculate your federal credit — a subtlety worth confirming with a CPA.

Check exactly what stacks in your state on our Solar Incentives by State hub and the official DSIRE database. The combination of the 30% federal credit and a strong state program can cut a system's net cost by 35–45%.

Common mistakes that cost real money

A handful of errors repeatedly cost homeowners thousands:

• Assuming a lease qualifies. With a lease or PPA, the third-party owner claims the credit, not you. To get the 30% yourself you must own the system — see lease vs buy vs loan.
• Forgetting the battery. Storage of 3 kWh+ qualifies on its own, even when added later. Don't leave that credit unclaimed.
• Mis-dating the claim to the contract date instead of the placed-in-service date.
• Over-claiming roof work. A full re-roof generally does not qualify; only solar-specific costs do.
• Confusing federal with state incentives — they are separate and usually stack.
• Discarding documentation. Keep invoices and certifications for at least the period the IRS can audit, plus any carryforward years.

A full worked example

Putting it together for a typical buyer: the Patel family installs a 7 kW system in 2026 for $21,000, plus a 10 kWh battery for $11,000, for a $32,000 project.

If the Patels owe $7,000 in federal tax the first year, they use $7,000 of the $9,600 credit now and carry $2,600 to next year. Combined with falling electricity bills, this is what turns a $32,000 sticker price into a strong long-term investment — see how fast it pays back with the Payback Calculator and the lifetime return with the ROI Calculator.