New York Solar Tax Credit — Worked Examples for Long Island Homeowners

Before the examples — the rules

New York State offers a residential Solar Energy System Equipment Credit equal to 25% of qualified solar energy system equipment expenditures, limited to $5,000 (per the New York State Department of Taxation and Finance). It is a non-refundable credit applied to your New York State personal income tax, with any unused portion carried over for up to five tax years.

These are illustrative worked examples to help Long Island homeowners read what their installer's proposal is showing. They are not personalized tax advice. Your specific situation depends on tax liability, filing status, system specifications, and program eligibility at the time of installation. Confirm details with a qualified tax professional and the relevant program administrator.

Numbers used below are round figures chosen for clarity — they do not represent specific quotes, specific homes, or guaranteed pricing.

Example 1 — Smithtown cape, cash-pay, no battery

Hypothetical Smithtown homeowner installs a 9 kW solar system (no battery). Total qualified solar equipment expenditures: $26,000. New York State 25% credit calculation: 25% × $26,000 = $6,500. Cap: $5,000. Credit applied to NY State income tax: $5,000.

The $1,500 of qualified expenditures above the cap does not generate additional NY credit. Federal residential incentives have changed — the IRS Residential Clean Energy Credit applied to qualified property installed from 2022 through December 31, 2025 and is not available for property placed in service after that date, so this 2026-installed system would not benefit from that specific federal credit. The planning review verifies whichever federal program (if any) is active at the time of installation.

Example 2 — Long Beach coastal, $0-down loan, with battery

Hypothetical Long Beach homeowner installs a 10 kW solar system plus a 13.5 kWh battery. Total qualified solar equipment expenditures: $38,000 (solar + battery, where battery qualifies under NY rules).

New York State 25% credit calculation: 25% × $38,000 = $9,500. Cap: $5,000. Credit applied: $5,000.

Because this is a $0-down loan, the homeowner should also examine the loan reamortization clause carefully. Many existing $0-down loan products assumed the federal Residential Clean Energy Credit would apply and would be paid down against principal within ~18 months. Since the federal credit is not available for property placed in service after December 31, 2025, the assumed credit will not exist for a 2026 install — meaning the loan may not reamortize the way the all-in monthly payment quote assumed. This is a question to raise with the installer, in writing, before signing.

Example 3 — Hauppauge ranch, modest tax liability, carryforward

Hypothetical Hauppauge homeowner installs a 7 kW solar system. Qualified expenditures: $22,000. NY State 25% credit: 25% × $22,000 = $5,500, capped at $5,000.

In the first tax year, the homeowner's New York State income tax liability is $3,200. The non-refundable credit reduces NY State tax to zero ($3,200 applied of the $5,000 available). The remaining $1,800 carries forward to subsequent tax years (up to five years total).

This carryforward feature is one of the more under-discussed aspects of the NY credit — most Long Island homeowners with moderate income and standard deductions can fully use the credit within the five-year window, even if they could not use it all in year one.

Example 4 — Freeport, municipal-utility twist

Hypothetical Freeport homeowner installs a 9 kW solar system. The system qualifies for the NY State 25% credit on the same basis as a PSEG-area home — the credit is a New York State tax credit, not a PSEG-specific program. Expenditures: $24,000. NY credit: $5,000 (capped).

What changes for Freeport addresses is the utility side, not the NY State credit side. Freeport Electric runs its own interconnection process and program credits, separate from PSEG Long Island net metering. The NY State tax credit math does not change; the bill-savings projection that an installer attaches to a Freeport proposal absolutely should reflect Freeport Electric program credits rather than PSEG net-metering language. See our utility comparison resource for the full breakdown.

What to bring to your tax professional

When the time comes to claim the credit, bring three things to your tax professional: (1) the final installation invoice broken out by qualified vs non-qualified expenditures, (2) the permission-to-operate documentation from your utility (PSEG, Freeport Electric, etc.), and (3) a copy of the proposal that itemized the system specifications. Form IT-255 (NY State residential solar credit form) is the relevant filing form; your tax professional will guide the actual return.

This is general information, not tax advice. Incentives change and eligibility varies — confirm details with the program administrator and a qualified tax professional.