What US Tax Policy Actually Rewards for Going Green
Solar lost its shortcut. Here’s what the tax code still rewards
Ask a business owner what “green tax credits” means right now and most will say some version of “didn’t that all get repealed.” It didn’t. The One Big Beautiful Bill Act, signed into law on July 4, 2025, cut a lot of the Inflation Reduction Act’s clean energy incentives short. It didn’t erase them. What’s left is narrower, more technical, and split unevenly across technologies, which means the businesses that still benefit are the ones that know exactly where the lines got redrawn.
That’s the real planning problem. Not “is there still money on the table,” but “which specific credit, for which specific technology, before which specific deadline.”
Solar and wind lost their long runway, everything else mostly didn’t
The clean electricity investment credit (section 48E) and production credit (section 45Y) are the backbone of federal clean energy support for businesses. Under the OBBBA, RSM’s legal summary of the law confirms solar and wind projects lose eligibility for facilities placed in service after December 31, 2027, unless construction began within 12 months of the law’s enactment.
Other technologies got left alone. Credits remain in place for facilities that begin construction through 2033. This covers energy storage, nuclear power, hydropower, marine and hydrokinetic energy, and qualified fuel cell property. Geothermal heat pump property has until 2034. None of these needed the rescue that solar and wind are getting through the accelerated deadline. Congress simply didn’t touch their timelines.
For a business planning a facility, the technology choice now carries a tax-timing consequence it didn’t carry a year ago.
Manufacturers still get rewarded for building the equipment
The section 45X advanced manufacturing production credit, which pays domestic manufacturers of solar panels, wind turbine parts, batteries, and critical minerals, survives with adjustments. Wind components sold after 2027 lose eligibility. Rules for components sold to another manufacturer for use in a larger product get tighter starting in 2027. Critical minerals face a phaseout window from 2031 through 2033, where before there was none.
Manufacturers with an existing allocation under the section 48C advanced energy project credit can still claim it. What changed is the funding pool behind it. The Department of Energy’s 48C program page confirms the IRS has now run two allocation rounds covering the full $10 billion authorized under the Inflation Reduction Act, most recently allocating roughly $6 billion across more than 140 projects in January 2025. Under prior law, unused or revoked allocations flowed back into the pool for future rounds. The OBBBA closes that door, so this second round is the last of it. A business counting on a future application round for 48C should stop counting on it.
Where the money moved: clean fuels and storage
While solar and wind got a shorter runway, the section 45Z clean fuel production credit got a longer one. Treasury’s own guidance on the credit and the IRS’s Internal Revenue Bulletin covering the OBBBA amendment confirm it now runs through fuel sold by December 31, 2029, with new restrictions limiting eligible feedstocks to the US, Canada, or Mexico, and a higher rate for small biodiesel producers through 2026.
Grant Thornton’s 2026 tax planning guide notes that solar, wind, and non-carbon transportation credits are the ones facing accelerated phaseouts, while other categories were largely left intact. Energy storage is one of the categories that came through cleanest, which lines up with rising demand tied to data center power needs.
What’s already gone
Several credits didn’t survive at all, and the deadlines for some have already passed by the time this is being read.
The section 30D clean vehicle credit and section 25E previously-owned clean vehicle credit for individuals both required a purchase by September 30, 2025. The section 45W credit for qualified commercial clean vehicles carried the same cutoff, a change the IRS’s own FAQ on the OBBBA’s vehicle credit changes lists alongside the other terminated dates. All three are closed now.
Residential credits are gone too. The section 25C energy efficient home improvement credit and section 25D residential clean energy credit both stopped applying to property placed in service or expenditures made after December 31, 2025.
Two deadlines are still live but closing fast. The section 179D energy-efficient commercial buildings deduction, which lets a business deduct qualifying building improvements upfront instead of depreciating them over 39 years, requires construction to begin by June 30, 2026, confirmed on the Department of Energy’s 179D program page. The section 30C credit for EV chargers and other alternative fuel refueling property has the same June 30, 2026 cutoff for placing property in service, per the IRS instructions for Form 8911.
Transferability is still open, and that matters more than it sounds
Under section 6418, a business that generates a clean energy credit but doesn’t have enough tax liability to use it can sell that credit to another taxpayer for cash. The OBBBA kept this mechanism in place, tied to the same phaseout schedule as the underlying credit, with one new restriction: credits can’t be transferred to specified foreign entities.
Thomson Reuters Institute reports that the market for transferable credits remains active into 2026 and 2027, with data center operators cited as a growing source of demand for buying credits to offset their own tax burden.
This is the piece that gets missed most often. A project developer without a large tax bill isn’t shut out of these incentives. They’re a seller in a market, not just a claimant on a return.
Federal clean energy credits at a glance
| Credit or deduction | Technology | Status under OBBBA | Key deadline |
| Section 48E / 45Y (ITC/PTC) | Solar, wind | Phased out for later projects | Placed in service by Dec 31, 2027, or construction begun within 12 months of enactment |
| Section 48E / 45Y (ITC/PTC) | Storage, nuclear, hydropower, geothermal, fuel cell | Largely unchanged | Construction begins by 2033 (2034 for geothermal heat pumps) |
| Section 45X | Manufacturing (panels, turbines, batteries, minerals) | Retained with tighter component and mineral rules | Varies by component; wind components lose eligibility after 2027 |
| Section 48C | Advanced energy manufacturing projects | Existing allocations honored; funding pool closed to future rounds | No new allocation rounds |
| Section 45Z | Clean fuel production | Extended | Through 2029 |
| Section 6418 | Credit transferability | Retained, with foreign entity restrictions | Tied to underlying credit’s phaseout |
| Section 179D | Commercial building efficiency | Terminating | Construction begins by June 30, 2026 |
| Section 30C | EV chargers, alt-fuel refueling property | Terminating | Placed in service by June 30, 2026 |
| Sections 25C / 25D | Residential efficiency and clean energy | Expired | Ended Dec 31, 2025 |
| Sections 30D / 25E / 45W | Vehicle purchases | Expired | Ended Sept 30, 2025 |
What this means for planning, not just filing
None of this is a one-time filing decision. It changes which projects get greenlit, which vendors get chosen, and how a capital plan gets sequenced over the next two to three years.
A business evaluating a solar installation now has a real reason to move construction dates up rather than wait. A manufacturer weighing whether to build a facility for wind components has a harder case to make than one building for storage or fuel cell components, purely because of how the credit windows differ. A developer without much tax liability has an actual, active market to sell credits into rather than sitting on paper value.
None of that shows up by reading the credit names off a list. It shows up by mapping actual deadlines and actual technology categories against a specific project, which is closer to financial modeling than it is to tax filing. The transition already underway in capital-intensive industries like automotive is a useful preview of how fast an incentive landscape can move once a business commits capital to it.
Frequently Asked Questions
Is the solar investment tax credit still available for businesses in 2026?
Yes, but with a harder deadline than before. Businesses need facilities placed in service by December 31, 2027, or construction started within 12 months of the OBBBA’s July 2025 enactment, to keep the credit.
Did the OBBBA eliminate all clean energy tax credits?
No. It phased out solar, wind, EV, and residential credits faster than prior law scheduled. It left storage, nuclear, hydropower, geothermal, and fuel cell credits mostly untouched through 2033, and extended the clean fuel production credit through 2029.
Can a business still sell a clean energy tax credit it can’t use?
Yes. Transferability under section 6418 remains in place, tied to the same phaseout dates as the credit being sold, with new restrictions on sales to specified foreign entities.
Is there still a tax credit for buying an electric vehicle for business use?
No. The section 45W commercial clean vehicle credit required vehicles to be acquired by September 30, 2025. That deadline has passed.
What’s the deadline for the commercial building energy efficiency deduction?
Construction on a qualifying project under section 179D needs to begin by June 30, 2026, to remain eligible.
Do tax-exempt organizations get any of these benefits?
Yes. Elective payment, also called direct pay, remains available to nonprofits, state and local governments, and other applicable entities for many of the credits covered here, even without taxable income to offset.
Which credits benefit manufacturers rather than project developers?
Section 45X rewards US-based manufacturing of solar components, wind turbine parts, batteries, and critical minerals. Section 48C supports advanced energy manufacturing projects, though only for taxpayers with an existing allocation, since the funding pool is closed to new rounds.
Where Oak Business Consultant fits
Reading the statute is one problem. Deciding whether a specific project clears the right deadline, under the right credit, with a financing structure that actually uses it, is another. That’s the gap Oak’s USA taxation advisory work closes for clients weighing clean energy investments against these shifting rules.
For businesses building the financial case before a lender or investor sees it, that groundwork usually starts with a defensible valuation and ongoing CFO-level oversight to keep the credit assumptions honest as the project moves from plan to construction. Not sure which credits actually apply to your project? Get in touch and we’ll walk through what’s eligible, what’s expiring, and what the numbers need to look like to make the case.
