The 2026 Federal Solar Tax Credit: What Actually Happened

Overview

If a 2026 solar proposal shows a 30% federal discount, it is using a rule that Congress repealed. The One Big Beautiful Bill Act (Public Law 119-21, signed July 4, 2025) accelerated the termination of several energy credits. The IRS's own FAQ, FS-2025-05, states plainly that the section 25D Residential Clean Energy Credit "will not be allowed for any expenditures made after December 31, 2025." There is no phase-down year and no 2032/2033/2034 step-down schedule left to rely on. The practical consequence for a household buying or financing panels in 2026 is simple and uncomfortable: the federal credit is $0. This page sets out exactly what the law says, what date decides eligibility, what still exists, and how to read a proposal that claims otherwise.

The rule, quoted

The IRS FAQ lists 25D alongside 25C, 25E, 30C, 30D, 45L, 45W and 179D with new termination dates. For 25D the termination is expressed as "expenditures made after December 31, 2025" — note the wording, which is different from the "placed in service" language used for 25C. Under the prior Inflation Reduction Act schedule, a 30% credit was to run through 2032, step to 26% in 2033 and 22% in 2034. That schedule was removed. Congress could restore a credit in future legislation, but no such law was in effect in November 2026, and a planning model should not assume one.

The date that decides your case

Question 7 of the IRS FAQ addresses a specific trap: paying for the system before the deadline does not preserve the credit if the installation finishes afterward. Section 25D(e)(8)(A) treats an expenditure as made when the original installation of the item is completed. If installation is completed after December 31, 2025, the expenditure is treated as made after that date and the credit is unavailable. There is a second rule for new construction: where the expenditure relates to construction or reconstruction of a structure, §25D(e)(8)(B) treats it as made when the taxpayer's original use of the structure begins. So panels installed in December 2025 on a house first occupied in January 2026 do not qualify under the completion test. If you believe a 2025 completion applies to you, take your closing documents and certificate of occupancy to a tax preparer — HelioCalc models 2026 installations only.

What a 2025 installation can still do

A system whose original installation was completed on or before December 31, 2025 is claimed on the 2025 federal return (Form 5695), filed in 2026. The credit is non-refundable, so it first offsets tax liability; an unused amount may carry forward to future years. That carryforward is why some 2026 tax discussions still mention 25D — it is about an old credit being used, not a new one being earned. This distinction matters when a salesperson says "the credit is still available." Ask which tax year and which installation date they mean.

What survives: §48E and third-party ownership

The commercial-side clean electricity investment credit under section 48E was not terminated by the same provision. A company that owns a leased system or sells power under a PPA may claim it and pass part of the value through in the price offered to the homeowner. The homeowner never claims it. This asymmetry is the single biggest structural change in the 2026 residential market: the remaining federal benefit sits with the equipment owner, not with the household. Section 48E has its own deadlines — including construction-start and placed-in-service requirements — and additional restrictions, so eligibility must be confirmed with the provider and a tax professional rather than assumed.

What is still available to homeowners

State income-tax credits, upfront rebates, performance incentives, SREC-style programs, sales- and property-tax exemptions, and net-metering rules all still exist and now carry the entire incentive load. In our November 2026 review we verified statewide credits in New York (25%, capped at $5,000), Massachusetts (15%, capped at $1,000), Arizona (25%, capped at $1,000), South Carolina (25%, capped at $3,500), New Mexico (10%, capped at $6,000), plus flat credits in Utah, Montana and Iowa. Production incentives such as New Jersey's SuSI, Massachusetts SMART and Illinois Shines depend on registration and are not modeled here. Verify every program on DSIRE and with your utility before relying on it.

How to audit a proposal

Ask for four lines in writing: the installed $/W before incentives; the name and statutory cap of every incentive applied; the export rate in cents per kWh; and the total of payments if financed. If a 30% federal credit appears anywhere on a 2026 installation, treat the whole calculation as unreliable. A proposal that is wrong about a $9,000 line on a $30,000 system is unlikely to be careful about the export tariff that will determine the next 25 years of savings.

Key figures worth keeping

• 30% — the credit rate that applied to qualifying installations completed by December 31, 2025.
• $0 — the federal residential credit for a homeowner-owned system whose original installation completes in 2026.
• Public Law 119-21, signed July 4, 2025 — the statute that accelerated the termination.
• IRS FS-2025-05, Q1 and Q7 — the guidance that states the rule and the installation-completion test.
• Form 5695 — the form used to claim a valid 2025 credit on the 2025 federal return.

How this shows up in a real estimate

In a real estimate the credit change appears as a line item, not as an argument. On a $24,000 array the old 30% credit would have removed $7,200 from the net cost. In 2026 that line reads $0, so the same system is $7,200 more expensive at the start of the cash-flow schedule. If year-one savings are about $1,400, that difference alone adds roughly five years to simple payback. This is why a proposal that quietly retains the old credit looks so much more attractive than one built on current law. HelioCalc shows the line explicitly, and the corrections log records that the earlier prototype of this site carried the error.

Checklist before you decide

• Find the installation-completion date in the contract, not the signature date.
• If a 2025 completion is claimed, confirm it on the 2025 return with a tax preparer.
• Ask which code section a provider cites when it mentions a federal credit.
• Re-run your estimate with the federal line at $0 and compare it to the proposal.
• Verify state credits separately — they are unaffected by the federal change.