Federal Solar Tax Credit in 2026: What New York Homeowners Should Verify Before Signing

What the federal solar tax credit actually is

The federal solar tax credit on a residential rooftop install in 2026 is the Residential Clean Energy Credit under Internal Revenue Code section 25D. It is a nonrefundable credit against your federal income tax for a percentage of qualified expenditures on solar electric property installed on your primary or secondary US residence.

Nonrefundable means it reduces what you owe. If you have no federal income tax liability for the year, you cannot use the credit that year, but any unused amount generally carries forward to future years under the current rules. That is one of the practical reasons financing path matters: a lease/PPA arrangement assigns the credit to the third-party owner, not to you.

The credit is filed on IRS Form 5695 with your federal return. The form instructions for the year you are filing govern the exact percentage, the eligible categories of expenditure, and how to compute the credit. The current-year Form 5695 instructions are the authoritative source — not an installer brochure.

What changed after 2025

Federal residential solar credit law changed in the years following the 2022 Inflation Reduction Act, and it changed again in the post-2025 window. For a New York homeowner planning a 2026 installation, the safest position is this: verify the current percentage, the placed-in-service rule, and any new requirements (such as documentation or domestic content rules where applicable) with a CPA before assuming any percentage in a proposal.

We are deliberately not citing a percentage figure in this article because installer-side promises about future-year percentages are exactly how homeowners end up with a proposal that does not match what they actually receive on their tax return. The IRS Form 5695 instructions for the tax year your system is placed in service is the controlling source.

If an installer has hard-coded a "30% federal credit" line into your savings estimate for a 2026 install without showing the source, that is the moment to ask: against what installation date, under what IRS guidance, and what happens to the proposal economics if the credit comes in differently than assumed?

• Verify the current credit percentage from the IRS Form 5695 instructions for your placed-in-service tax year.
• Verify what qualifies as eligible expenditures (panels, inverters, mounting, labor, sales tax, balance-of-system, and certain battery storage — under current rules and amounts).
• Verify the placed-in-service definition that applies to your project (generally, when the system is installed, inspected, and ready for use under applicable utility and code rules).
• Verify how the federal credit interacts with any state credit, utility rebate, or incentive payment that may reduce the basis used to compute the federal credit.
• Verify with your CPA whether the credit can offset your full liability this year, or whether part will carry forward.

Eligible costs vs. the gross sticker price

A frequent point of confusion: the federal credit is not a flat percentage of the proposal sticker price. It is a percentage of qualified expenditures under the IRS definition for that tax year. There are categories that may not count toward the credit and there are categories where the rules are nuanced (for example, roof work that exclusively supports the solar system versus a full roof replacement that also provides general roofing benefits).

For most New York homeowners, the practical implication is straightforward: ask the installer to provide a line-item breakdown of the proposal that separates solar equipment, mounting and balance of system, labor, sales tax, permitting, interconnection costs, battery storage (and the storage rules that apply), and any roof or electrical scope. Your CPA can then map which line items qualify for the credit and which do not.

The wrong proposal applies the federal percentage to the entire bundled price, including items that may not qualify. The right proposal shows the line items, lets your CPA confirm, and only then closes the math.

The full New York stack — federal plus four state/city levers

No New York homeowner should plan a solar project on the federal credit alone. The state and city add four real levers that, applied in the right order, can materially change the project math. Each lever has its own filing path, its own eligibility, and its own pitfalls.

How the levers stack — the order matters

The reason the order matters is that some incentives reduce the basis used to compute the next one. The exact stacking sequence depends on current federal, state, and city rules and on your CPA's reading. A general framework:

Start with NY-Sun. The NY-Sun Megawatt Block incentive is paid through the installer and applied at the project level, which means it can reduce the gross cost the homeowner pays. Whether and how it affects the basis for the federal or state credit is a CPA question, not an installer question.

Layer in the federal credit and the NY State credit on the appropriate basis as defined by current IRS and NY State guidance. The $5,000 NY State cap means that for larger systems (above roughly $20,000 of qualified state-eligible expenditures), the state credit is capped while the federal credit continues on the full eligible basis.

For NYC borough projects, apply the SEGS abatement across the four-year window on eligible expenditures. The abatement is applied through the property tax bill, not as a cash rebate. Your annual property tax in the four years following placed-in-service is reduced.

For non-NYC New York homeowners, confirm the RPTL 487 exemption with your local assessor. The exemption applies to the added assessed value of the solar equipment, not to the underlying property tax base.

Practical filing checklist for a 2026 NY install

• Keep the signed proposal, change orders, all invoices, the interconnection agreement, the utility PTO (permission to operate) letter, the building permit, and the system commissioning report. These document the placed-in-service date.
• Keep proof of payment showing exactly what you paid out of pocket after any installer-applied NY-Sun incentive.
• For NYC projects, work with your installer on the DOB filing path and the NYC Department of Finance abatement application. NYC has its own application timeline and deadlines that govern when the abatement begins.
• For NY State, file Form IT-255 with your NY personal income tax return for the placed-in-service year.
• For federal, file IRS Form 5695 with your federal return. If the credit exceeds your liability, follow the carryforward rules in the current-year instructions.
• For RPTL 487, contact your local town or county assessor before or shortly after install to confirm exemption status and any required application.

Red flags in 2026 New York solar proposals

These are the proposal patterns we routinely see and that homeowners should challenge before signing. None of them automatically disqualify a proposal, but each one is a question that should be answered in writing.

• A flat "30% federal" line in 2026 with no install-date or IRS Form 5695 citation. Ask which placed-in-service year the percentage was sourced for.
• The federal percentage applied to the full bundled sticker price including non-eligible items. Ask for the line-item eligible expenditure schedule.
• A "guaranteed" tax credit value. The credit depends on your tax liability and your CPA's analysis. No installer guarantees that figure.
• No mention of the NY State 25% credit and $5,000 cap. This is a $5,000 oversight on most NY proposals where it is omitted.
• No mention of the NYC SEGS abatement on a Brooklyn, Queens, Bronx, Manhattan, or Staten Island project. The abatement is borough-only and worth real money.
• A NY-Sun rate quoted without naming the region and the current block. Block rates change as blocks fill.
• A RPTL 487 assumption without confirming the local jurisdiction. Some towns have opted out.
• A lease/PPA proposal where the homeowner is told they will claim the credit. The third-party owner generally claims it in a lease/PPA.

How EnergiSense models the federal credit in 2026 proposals

On every 2026 New York proposal we issue, the federal credit line is presented conservatively. We name the percentage from the current IRS Form 5695 instructions, name the placed-in-service tax year the proposal is sized against, and recommend CPA verification before the proposal is treated as final.

We also separate the federal line from the NY State line, the NYC abatement line (where applicable), the NY-Sun incentive line, and the RPTL 487 expectation. That separation lets you and your CPA confirm each lever independently rather than treating the project as a single bundled-savings number.

When we are not sure of the right treatment of a particular cost item, we say so and recommend your CPA make the call. That is the bar — and it is the bar every NY proposal you compare ours to should be held against.