Federal Solar Tax Credit Sunset — What It Means for Long Island in 2026

What changed

The IRS Residential Clean Energy Credit applied to qualified clean energy property installed from 2022 through December 31, 2025 and is not available for property placed in service after that date. For Long Island homeowners signing solar contracts in 2026, the federal credit that drove a meaningful share of solar economics for the past several years does not apply unless a future federal program restores or replaces it.

This is the single most consequential 2026 change for residential solar math on Long Island. Long Island Solar Installation Pros provides solar installation help — we are not a tax advisor and we are not a federal program administrator. This guide is general information meant to help homeowners read what a 2026 solar proposal is showing them. Confirm details with the program administrator and a qualified tax professional.

What this means for projects placed in service in 2026

A solar system newly placed in service in 2026 — meaning installed, inspected, interconnected, and granted permission to operate by the utility within the 2026 calendar year — does not qualify for the IRS Residential Clean Energy Credit as it existed through 2025. The planning review verifies any active federal program at the time of installation rather than assuming one is in force.

The New York State 25% residential solar equipment credit (capped at $5,000) remains active. It is a New York State tax credit, claimed on the New York State return, and is unaffected by the federal sunset. NYSERDA solar + storage incentives and PSEG Long Island net metering also remain unaffected.

What this means for existing $0-down solar loans

This is where the federal sunset has the biggest practical impact for Long Island homeowners. Many existing $0-down solar loan products were structured around a built-in reamortization assumption: the homeowner would receive the federal credit at tax time and pay it down against the loan principal within roughly 18 months. The all-in monthly payment was calculated assuming that payment-down happened.

If a homeowner signed a 2025-era $0-down loan product but the project is placed in service in 2026 (and the federal credit therefore does not apply), the assumed credit payment-down does not happen. The loan may then not reamortize the way the original quote assumed, and the homeowner's monthly payment after month 18 could be higher than they expected.

For any 2026 installation funded by a pre-existing $0-down loan product, ask in writing: which federal credit did this loan structure assume, what happens to the reamortization if that credit does not apply, and what is the all-in monthly payment in that scenario.

What stays the same on Long Island

New York State 25% residential solar equipment credit (capped at $5,000) — unchanged.

PSEG Long Island net metering — unchanged.

NYSERDA Long Island solar + storage installation incentive — still active, still works the same way for eligible projects.

PSEG Long Island Battery Storage Rewards — still active, through aggregators.

Freeport Electric, Rockville Centre Electric, and Greenport Municipal Light program credits — unchanged, follow each municipal utility's own rules.

The structural Long Island solar math — relatively high electric rates, workable roof exposure for most homes, generous state-level incentive stack — is intact. What is gone is the federal layer that sat on top of that stack through 2025.

What might come next (and why we are not modeling it)

Federal residential clean-energy policy is political and can change. A future federal program could restore, replace, or modify residential solar incentives. We do not model speculative future programs in homeowner proposals. The planning review uses the federal-program landscape that is actually in force at the time of your installation — if that changes mid-project, the math gets revisited in writing.

Action items for Long Island homeowners considering solar in 2026

Read any existing solar proposal for the assumed federal credit math. If a proposal still references "30% federal credit" without qualification, that is a yellow flag worth raising directly with the installer.

Re-examine $0-down loan structures specifically — they are where the federal sunset has the biggest math impact.

Confirm that the NY State 25% credit, NYSERDA incentives, and PSEG Long Island net metering are reflected accurately in any new 2026 proposal. Those layers are still active.

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