Energy-related tax incentives have been a popular planning tool for real estate owners, developers, and builders, helping offset the cost of high-efficiency HVAC, building envelope upgrades, solar projects, and energy-efficient new construction. The challenge today is that many of these incentives have been shortened, accelerated, or tightened by the 2025 Act (often referred to as the One Big Beautiful Bill Act or OBBBA).
That doesn’t mean energy incentives are “gone.” It does mean that timing and documentation matter more than ever. Below is a practical overview of several key federal incentives that affect commercial buildings, new home construction, and residential upgrades, and the windows that remain open.
Key Takeaways
- The 2025 Act shortened or accelerated the availability of several energy-related tax incentives rather than eliminating every incentive outright.
- Section 179D generally required qualifying commercial building construction to begin on or before June 30, 2026, while the Section 45L credit generally applied to qualified homes acquired on or before that date.
- Sections 25C and 25D generally stopped applying to qualifying improvements or expenditures after December 31, 2025, although unused qualifying Section 25D credits may still be carried forward.
- Section 6418 transferability remains available for certain eligible business energy credits, subject to specific registration, election, and filing requirements.
- Documentation remains critical. Construction dates, placed-in-service dates, expenditures, certifications, invoices, and other project records can determine whether an incentive is available.
1. The Big Picture: Many Incentives Were Shortened, Not Fully Repealed
If you’ve heard that “the government took back most of the energy credits,” there’s a reason for that perception: several credits and deductions that previously had longer runways into the late 2020s or 2030s now have much earlier cutoffs. In many cases, the benefits are still available—but only if construction begins, property is placed in service, or expenditures are made by specific dates.
For real estate owners and builders, these rules can affect:
- Project feasibility and pricing (especially for energy upgrades and new construction)
- Contract language (to define scope, dates, and responsibility for certifications)
- The timing of purchases and installations
- Financing and investor returns
2. IRC Sec. 179D: Commercial Building Deduction (Time-Limited)
IRC Sec. 179D can allow a meaningful deduction for qualifying energy efficient commercial building property. It can apply to certain improvements to commercial buildings (and some multi-family buildings above a certain size), generally focused on major building systems such as:
- Interior lighting systems
- HVAC and hot water systems
- Building envelope improvements
What changed under the 2025 Act
The key planning point is timing: the deduction remains available only for qualifying property where construction begins on or before June 30, 2026. If construction begins after that date, the Section 179D deduction is generally not available.
Practical takeaway
If you’re planning a major retrofit (lighting, HVAC, or envelope upgrades), confirm early whether the project can meet the construction-begins deadline and whether you can obtain the required certification and documentation. On many projects, delays come from permitting, procurement lead times, or change orders, so it’s wise to build a timeline backward from the statutory deadline.
3. IRC Sec. 45L: New Energy Efficient Home Credit (Shortened to Mid-2026)
IRC Sec. 45L is a credit available to eligible contractors for building or substantially reconstructing qualified new energy efficient homes that are sold or leased to customers for use as a residence. In plain terms, this credit is typically most relevant to:
- Homebuilders
- Residential developers
- Contractors involved in substantial reconstruction where they meet the eligibility requirements
What changed under the 2025 Act
The credit remains available only for qualified homes acquired on or before June 30, 2026. Prior law had allowed a much longer window (previously running through 2032), so this is a significant acceleration.
Practical takeaway
Builders and developers should confirm whether their pipeline deliveries (including closings and lease commencements, as applicable) can occur by June 30, 2026. If you’re close to the line, it may be worth reviewing construction schedules, punch-list processes, and buyer financing timelines to reduce the risk of missing the cutoff.
4. IRC Sec. 25C: Energy Efficient Home Improvement Credit (Cut Off After 2025, No Carryforward)
IRC Sec. 25C is the Energy Efficient Home Improvement Credit commonly associated with certain qualifying upgrades to a primary residence (and, in some cases, other eligible residences). Examples may include certain insulation and energy property items, subject to detailed rules and limits.
What changed under the 2025 Act
For most taxpayers, this credit generally no longer applies to property placed in service after December 31, 2025. Just as important: unused 25C credits cannot be carried forward.
Practical takeaway
Homeowners considering qualifying upgrades should pay attention to when the property is actually placed in service—not just when it’s ordered or paid for. If the work isn’t completed (and placed in service) by year-end 2025, the credit may be lost.
5. IRC Sec. 25D: Residential Clean Energy Credit (Still Available Through 2025, Carryforward Remains)
IRC Sec. 25D is the Residential Clean Energy Credit, often associated with residential solar, battery storage, geothermal, and certain other qualifying technologies. Unlike Section 25C, Section 25D typically involves larger-ticket items and can be a major factor in a homeowner’s project economics.
What changed under the 2025 Act
The credit remains available for qualifying expenditures made through December 31, 2025, but generally not for expenditures after that date.
The more favorable rule here is that unused 25D credits generated from qualifying pre-2026 expenditures may be carried forward to future years (subject to the usual tax liability limitations that apply to nonrefundable credits).
Practical takeaway
If a homeowner incurs qualifying costs by the end of 2025 but can’t use the entire credit in that year, the carryforward may preserve the benefit, so long as the expenditures themselves are timely and properly documented.
6. Monetizing Business Energy Credits: Transferability (Sec. 6418) and “Direct Pay” (Sec. 6417)
Many real estate projects are owned through partnerships and LLCs, and many taxpayers don’t have enough tax liability to use certain business energy credits efficiently. Two important monetization tools have been in play in recent years:
IRC Sec. 6418: Transferability (Not Repealed, But Not Universal)
The 2025 Act did not repeal the Section 6418 elective transfer rules. That means certain eligible credits can still be transferred (sold) to unrelated buyers for cash, subject to detailed requirements.
Key practical points:
- Transferability applies only to eligible credits (not every incentive is transferable).
- Transfers generally require IRS pre-filing registration and a registration number.
- The election timing and return filing mechanics matter. Many elections can’t simply be “fixed later” if missed.
- Credit property may carry basis reduction and recapture considerations depending on the credit involved.
IRC Sec. 6417: Direct Pay (Mostly Not for Typical Taxable Real Estate Owners)
“Direct pay” is generally designed for tax-exempt and governmental entities. For most taxable real estate owners and developers, direct pay is not broadly available.
There are narrow exceptions where partnerships or S corporations may elect direct pay for certain specific credits, but those are the exception rather than the rule. From a planning standpoint, many taxable real estate businesses will focus more on traditional tax capacity planning and, where applicable, credit transferability rather than assuming direct pay is available.
7. Wind and Solar Projects: Accelerated Timing Under IRC Secs. 45Y and 48E
For larger renewable projects (including certain wind and solar facilities), the landscape is also tighter. The 2025 Act accelerated timing limits under IRC Secs. 45Y and 48E. In practical terms, developers should expect stricter “begin construction” and “placed in service” timing constraints than many older models assumed.
Even where credits remain technically available, eligibility often turns on project calendars, construction-start documentation, and procurement milestones. For sponsors and investors, this can affect underwriting, financing terms, and transaction documentation.
Practical Checklist: Action Steps to Take Now
If you own, build, manage, or invest in real estate and are considering energy upgrades or energy-focused construction, start by matching the incentive to the project and confirming the key deadlines early. For many commercial projects, the planning trigger is whether construction can begin by June 30, 2026 for Section 179D. For builders looking at Section 45L, the key question is whether homes can be acquired by June 30, 2026. For homeowners considering Sections 25C and 25D, the practical focus is on year-end 2025 timing, including placed-in-service dates for improvements and when qualifying expenditures are actually made.
Next, build the tax requirements into the project plan so the documentation does not become the bottleneck. Assign responsibility up front for any required certifications, testing, and statements, and manage scope changes and schedule risk so the project does not slip past a cutoff date.
Finally, if credit transferability may be part of the strategy for a business project, begin that process early and keep documentation organized. In practice, that means modeling tax capacity, coordinating return filing mechanics, and retaining invoices, proof of payment, and placed-in-service records in a single file.
Final Thought
Energy incentives are still an important planning tool for real estate owners and builders, but the calendar matters more than it did even a year ago. If you’re in the early stages of budgeting a retrofit, planning a development pipeline, or evaluating solar or battery storage for a property, it’s worth confirming which incentives still apply and what deadlines drive the plan.
Disclaimer: This article is intended for general informational purposes only and does not constitute tax, legal, or accounting advice. Eligibility for energy-related deductions and credits depends on a taxpayer’s specific facts, project documentation, and the timing of construction, placed-in-service dates, and expenditures. Please consult your tax advisor regarding your particular situation.
