The Solar Tax Credit Expired: What §25D Really Said

Look up the Residential Clean Energy Credit on irs.gov and the page states plainly that the credit "is not available for any property placed in service after December 31, 2025" (IRS, Residential Clean Energy Credit, read 19 August 2026). Look up the statute that page is summarizing, 26 U.S.C. §25D, and the operative sentence says something different: the credit "shall not apply with respect to any expenditures made after December 31, 2025" (26 U.S.C. §25D, via Cornell Law School's Legal Information Institute, read 19 August 2026).

Same date. Two different legal tests. And the gap between "placed in service" and "expenditures made" is exactly wide enough to swallow a system that was contracted in November 2025, permitted in December, and finished on a roof in the second week of January — a timeline that describes a large share of the installs that were rushed to beat the deadline in the first place.

This article is the one to read before any of the arithmetic on this site: what actually ended, on what legal terms, and what did not end because it was never part of the same law.

What killed it, and when

The credit did not sunset on its own schedule. Before mid-2025, §25D had been written to run at 30% through 2032, step down to 26% in 2033 and 22% in 2034, then end. The One Big Beautiful Bill Act — Public Law 119-21, signed 4 July 2025 (139 Stat. 72) — struck that phase-down and replaced it with the flat 31 December 2025 cutoff quoted above. The IRS's own FAQ on the change states it directly: "The credit will not be allowed for any expenditures made after December 31, 2025" (IRS, FAQs for modification of sections 25C, 25D, 25E, 30C, 30D, 45L, 45W, and 179D under Public Law 119-21, Fact Sheet 2025-05, read 19 August 2026). The same FAQ set closed out the parallel credits: 25C (home improvements), 25E (used clean vehicles), 30C (alternative fuel refueling property), 30D (new clean vehicles), 45L (builder credit for new energy-efficient homes), 45W (commercial clean vehicles), and 179D (commercial buildings deduction) all got new termination dates in the same bill. §25D and §25C share 31 December 2025. The others do not all share that exact date — if any of them apply to your situation, read that credit's own IRS page rather than assuming it lines up with the solar credit.

The test that actually decides your case: §25D

Old §25D covered a specific list, and every item on it is gone for anything not already installed: 30% of the cost of solar electric panels, solar water heaters, geothermal heat pumps, small wind turbines, fuel cells, and — since 2023 — battery storage of at least 3 kWh.

The subsection that decides whether a specific project made the deadline is §25D(e)(8), and it is narrower than most people assume. It reads: "An expenditure with respect to an item shall be treated as made when the original installation of the item is completed." A separate clause covers new construction: the expenditure is treated as made "when the original use of the constructed or reconstructed structure by the taxpayer begins."

Read that against a normal solar timeline. A deposit in November, a permit pulled in December, panels physically mounted before New Year's — none of those dates is the one the statute asks about. The question is when installation was completed, which in practice usually means the date of final inspection, permission-to-operate (PTO) from the utility, or whatever the installer's own paperwork marks as substantial completion. A system energized on 3 January 2026 does not qualify, even if every dollar changed hands in 2025. This site's battery sizing article walks through the same past-tense treatment for storage: battery capacity of at least 3 kWh had been eligible from 2023 onward, and that eligibility is now a closed historical fact, not a live incentive to plan a purchase around.

If a proposal in front of you nets out 30% and the installer's own schedule shows a 2026 completion date, that line item is arithmetic left over from a template nobody updated. Ask, in writing, for the projected completion or PTO date — not the contract date — before you believe the bottom line.

A different test, same finish line: §25C

The Energy Efficient Home Improvement Credit — heat pumps, heat pump water heaters, insulation and air sealing, exterior doors and windows, electrical panel upgrades tied to other qualifying work, and home energy audits — lived in a separate section, §25C, worth up to $3,200 a year in total, with a $2,000 sub-cap for heat pumps and heat pump water heaters specifically. It terminates under §25C(i), which states: "This section shall not apply with respect to any property placed in service after December 31, 2025."

"Placed in service" is the standard test used across most of the tax code — generally the date equipment is installed and ready for its intended use, not necessarily the date of the final walk-through. It is a different legal standard from §25D's installation-completion rule, even though the two frequently land on the same practical date for a piece of equipment installed and turned on in one visit. The distinction matters most at the edges: a multi-stage project, or a heat pump installed but not yet commissioned, could in principle be treated differently under the two tests. If a project straddles both a heat pump (§25C) and a battery (§25D) on the same invoice, do not assume one placed-in-service date settles both credits — check each section's own test against the specific equipment. This site's heat pump breakeven article goes through the $2,000 figure and the same December 2025 cutoff in the context of the operating-cost math the credit used to subsidize.

What the missing 30% actually costs, worked

Stand-in numbers only, so the shape is visible — not a quote, not a forecast:

System price (quoted total, before any credit): $24,000
Credit under the old, pre-OBBBA §25D:            $24,000 x 0.30 = $7,200
Net cost if installed and completed in 2025:      $24,000 - $7,200 = $16,800
Net cost for the identical system completed 2026+: $24,000  (no §25D offset)

Difference a 2026 buyer pays vs. a 2025 buyer, same hardware: $7,200

Redo it with your own quoted total and the answer scales linearly — the credit was always exactly 30% of cost, with no cap on the residential clean energy side (unlike §25C's per-item and annual caps). If a salesperson's worksheet still subtracts a "federal incentive" line from a 2026 install, ask them to point to the section of the tax code that survived to authorize it. For §25D and §25C, none did.

What survived, because it was never in the same law

Here is the part that gets lost once "the tax credit expired" becomes the whole story: the One Big Beautiful Bill Act amended the Internal Revenue Code. It did not touch the Inflation Reduction Act of 2022's separate appropriations for state-run rebate programs, because those live in a different statute entirely.

A pair of those programs are the ones most likely to show up in a 2026 quote:

HOMES (Home Owner Managing Energy Savings), IRA §50121, appropriated $4.3 billion nationally for whole-house energy efficiency rebates administered by state energy offices.

HEEHRA (High-Efficiency Electric Home Rebate Program), IRA §50122, appropriated $4.275 billion for states plus $225 million for tribes, aimed at point-of-sale rebates on heat pumps, heat pump water heaters, electrical panel and wiring upgrades, and induction stoves for low- and moderate-income households — up to $14,000 per household depending on income tier and measure (DOE, Home Energy Rebates Programs, read 19 August 2026).

Both are real, both are still authorized, and neither depends on §25C or §25D existing. But "still authorized" is not the same as "money is sitting there waiting for you." DOE's own program page is blunt about the rollout: "Home Energy Rebates are now available in select states. Additional details on active state, territory or Tribal rebate programs are coming soon," and it directs households to contact their own State or Territory Energy Office for status and eligibility rather than publishing a live national tracker. Program design, income verification, and installer-network setup were left to each state, and as of mid-2026 a meaningful number of states had still not opened applications.

California is the clean illustration of the other failure mode — a program that launched and then ran out. The California Energy Commission's own program page states that "HEEHRA rebates for single-family home retrofits are fully reserved statewide" as of 24 February 2026, with new requests placed on a waitlist against possible future budget (CEC, Inflation Reduction Act Residential Energy Rebate Programs, read 19 August 2026). California received $290 million of the national HEEHRA allocation; a second phase of $152 million was, as of that page, not yet available. Single-family reservations reopened in October 2025 with additional funding, and then closed again. That is a state that both launched the program and spent through it inside about a year — the opposite failure from a state that never launched at all, and both look identical to a homeowner who just wants to know if the money is real.

The lesson from both failure modes together: a rebate program's continued legal existence tells you almost nothing about whether funds are available in your state this month. Confirming that is a separate check against your own state's program page and DSIRE's listing, not something this article can settle for you nationally.

What else sits outside the repealed sections

A shorter list, because each of these is a different body of law and this site's job is to flag them, not to relitigate each one:

• State income tax credits and exemptions. A number of states run their own solar, battery, or heat pump credits independent of the federal code. DSIRE — the Database of State Incentives for Renewables & Efficiency, maintained by NC State University's Clean Energy Technology Center since 1995 (DSIRE, read 19 August 2026) — is searchable by ZIP code and lists these program by program, including whether each is a tax credit, rebate, exemption, or financing program.
• Property tax and sales tax exemptions for renewable energy equipment, which most states administer through their assessor's office or department of revenue rather than an income tax return, and which the federal repeal has no authority to touch.
• Utility rebates, funded by ratepayer public-benefits charges rather than any federal appropriation, and set by each utility's own tariff filings with its state regulator.
• Net metering and net billing — the rate at which exported kWh get credited — is a state public-utility-commission matter, not a tax provision, and unaffected by any of this.
• Third-party-owned systems — leases and power purchase agreements — sit on different tax footing entirely, because the system owner claiming any credit is the leasing company or PPA provider, filing as a business, under a different code section (the commercial investment tax credit, §48E) with its own eligibility and phase-down rules that the OBBBA modified separately. That is enough of a different question — solvency of the counterparty, contract escalators, who actually owns the equipment — that it belongs in its own comparison rather than a footnote here.

None of this is a workaround for the 30% that ended. It is a reminder that "the federal solar credit expired" and "there is no more help available" are two different sentences, and quotes sometimes blur them on purpose.

Reading a 2026 quote against the actual dates

Three checks, none of them requiring anything but the paperwork already in front of you:

First, find the projected completion date — not the contract date, not the deposit date. For §25D, that is the date the credit's own timing rule looks at. Push back if an installer cannot give you one in writing.

Second, if §25C equipment is on the same invoice, confirm its placed-in-service date separately. Do not assume one date resolves both credits just because they share a December 2025 finish line in the statute.

Third, before counting any dollar figure that is not a straightforward invoice discount, find the specific program by name — HOMES, HEEHRA, a state credit, a utility rebate — and check its administrator's own page for that state's funding status this month, the way California's did in February. A line item labeled simply "incentive" or "rebate" with no program name attached is not something you can verify, and this site's position is that a number you cannot trace back to a source is not a number you should count.