The Tri-State Area’s Top Solar Installers
Homeowners ask me “can I claim solar tax credit for structural roof reinforcement” more than almost any other question about eligible costs, and the answer is no in nearly every case.
No. In almost every case, structural roof reinforcement does not qualify for the federal solar tax credit. The IRS treats rafters, trusses, sistered joists, purlins, decking, and sheathing as structural components of the building, not as solar energy property, even when an engineer requires them before panels can go up.
Structural reinforcement is treated as part of your building, not as part of your solar energy system. Rafters, trusses, blocking, and roof decking primarily serve a roofing or structural function, and the IRS excludes them from the credit even when an engineer requires the work before panels can go on.
I have been selling and scoping solar in Chester County, Delaware County, and across Pennsylvania, Delaware, New Jersey, and Maryland for over a decade. TerraSol is a family-run company that has worked only on photovoltaic systems since 2009.
My background is finance, so cost allocation is the part of this job I get pulled into most often. What follows is what I tell customers before they sign, and what I tell them when their tax advisor calls me in March.
I am not a CPA, and this is not tax advice. Confirm your position with a tax professional before you file.
See what your address actually qualifies for. PECO rebate, SRECs, net metering, and 48E eligibility all depend on your utility territory and roof. I’ll put the real numbers in writing. Request a custom solar proposal.
Here is the split I walk customers through.
| Cost | Counts? | Reason |
|---|---|---|
| Sistering rafters, reinforcing trusses, added blocking | No | Structural support for the building |
| New roof decking or sheathing | No | Structural components |
| Roof replacement before installation | No | Traditional roofing materials |
| Asphalt shingles, underlayment, metal roofs | No | Traditional roofing |
| Racking, rails, L-feet, standoffs, lag bolts | Yes | Mounting hardware for the solar system |
| Flashing at array penetrations | Generally yes | Part of the attachment assembly |
| Solar roofing tiles and solar shingles | Yes | Serve both the functions of roofing and solar electric generation |
| Solar panels, inverters, wiring, monitoring | Yes | Qualified solar electric property |
| Labor costs, onsite preparation, permitting | Yes | Installation costs tied to the solar system |
| Ground mount footings and piers | Yes | Support the solar system, not the building |
The Residential Clean Energy Credit is set forth in 26 U.S.C. § 25D. It covers qualified solar electric property, meaning property that uses solar energy to generate electricity for a residence.
If you want the underlying mechanics, we cover how photovoltaic cells turn sunlight into usable power separately. Alongside solar, Section 25D also covers solar water heaters, fuel cell property, geothermal heat pumps, small wind, and battery storage technology, each with its own rules.
The IRS position on roofs has been consistent across two decades of guidance. Asked directly whether a roof is eligible, the agency answers:
“In general, traditional roofing materials and structural components do not qualify for the credit. However, some solar roofing tiles and solar roofing shingles serve as solar electric collectors while also performing the function of traditional roofing, serving both the functions of solar electric generation and structural support and such items may qualify for the credit.
Components such as a roof’s decking or rafters that serve only a roofing or structural function do not qualify for the credit.”
IRS, Energy Incentives for Individuals: Residential Property Questions and Answers
That page is archived, but the agency repeated the same position in its current FAQs on Residential Clean Energy Property Credit qualifying expenditures, updated in Fact Sheet 2025-01, which names roof trusses and traditional shingles as examples of components that do not qualify.
A roof’s decking is the clearest case. It holds up the roof. It would hold up the roof with or without solar panels. It is not renewable energy equipment.
Reinforcement follows the same logic. When a structural engineer specs sistered lumber because 1960s framing cannot carry another three to four pounds per square foot, that lumber is doing what framing does. Solar triggered the expense. That does not convert it into solar electric property.
Section 25D(e)(2) says no expenditure relating to a solar panel or other property installed as a roof fails to be treated as qualified property solely because it constitutes a structural component of the structure on which it is installed.
I have had customers forward me that sentence with the reinforcement line item highlighted. It does not do what they hope. The provision exists so that solar tiles and solar shingles, which are the roof and also generate electricity, are not disqualified for doing both jobs. It does not make the framing or roofing underneath a rack-mounted array eligible.
Some installers and some forum posts argue that because the solar installation could not physically proceed without the reinforcement, the cost is integral and should be included in eligible costs.
I understand the logic. I would not build a customer’s expectations on it. Section 25D has no necessity test written into it. That concept comes from commercial energy property rules, which are a separate part of the code.
A tax professional may still take the position, but treat it as a filing position that needs engineering documentation behind it, not as settled law.
Roof under ten years old? Get the sequencing right before design, not after. A free roof and structural assessment costs you nothing and saves the cost of pulling an array off later. Reach out for a custom solar proposal.
If you are still filing, amending, or carrying forward a credit for a solar installation completed on or before December 31, 2025, how the contract reads matters.
This is one more reason to compare installer proposals line by line rather than on bottom-line price. Ask your solar installer for:
Do not accept a single lump sum labeled “solar installation” that quietly absorbs $8,000 of framing. Bundling does not make the reinforcement eligible. It makes the whole invoice harder to support, which puts the qualified portion at risk too.
Take an 8.4 kW system at $31,500 total, including $6,000 of rafter reinforcement and deck repair the engineer required. That is a common size once you work out how many panels a house actually needs.
| Item | Cost | Eligible |
|---|---|---|
| Panels, inverters, racking, wiring, labor, permits | $25,500 | $25,500 |
| Reinforcement and deck repair | $6,000 | $0 |
| Total | $31,500 | $25,500 |
At 30%, the credit amount is $7,650, not $9,450. The $1,800 gap is what the allocation is worth.
This is also why I push customers to look at what a solar project really costs over its lifetime rather than the headline number in a proposal.
This is the part I now cover in every consultation.
The One Big Beautiful Bill Act, signed July 4, 2025, ended the Section 25D federal solar tax credit for property placed in service after December 31, 2025.
The Inflation Reduction Act had scheduled it to run through 2032 with a phase-down after that. It did not phase down. It went to zero. The Congressional Research Service and SEIA both document the change.
What that means:
Systems installed and operational on or before December 31, 2025: eligible. Claim the credit on IRS Form 5695 with your 2025 federal tax return.
Placed in service controls the tax year. Not the contract date, not the deposit. The system has to be installed and operating.
If the credit exceeds your tax liability, the unused portion carries forward to a later tax year on that year’s IRS form. This still works for pre-2026 systems.
Cash or loan purchases in 2026: no federal solar tax credit on your federal income tax.
The law is not retroactive. Residential energy credits already claimed for earlier years stand.
So if you are reading this in 2026 while comparing a reinforcement quote against a solar quote, the allocation question has mostly gone away at the federal level. There is no solar ITC left on a cash purchase to allocate against. The question that matters now is which financial incentives still apply.
The federal solar tax credit is gone for purchases, but residential solar in PECO territory still has a stack of financial benefits.
PECO’s residential solar rebate. PECO’s Act 129 energy efficiency program runs Phase V from June 1, 2026 through May 31, 2031, per the Pennsylvania PUC. The residential solar rebate continues past its earlier April 30, 2026 end date. We break down the extension in our update on the rebate running through 2031, and the step by step application process has not changed.
Section 48E through third-party ownership. The commercial credit survived. Under a lease or power purchase agreement, the provider owns the system, claims the 30% federal investment tax credit, and passes value through at a lower rate.
Construction must begin before July 4, 2026, or the system must be placed in service by December 31, 2027. The tradeoff: under a power purchase agreement, you do not own the system, so SRECs and depreciation stay with the owner.
My honest read on that choice is in our 2026 comparison of owning versus leasing, and we ran the same numbers years ago in what free solar actually costs a homeowner.
Pennsylvania SRECs. Your solar system earns one certificate per 1,000 kWh generated. SRECs go to the owner of the system, which is another reason ownership beats a lease for a lot of households.
Net metering. Pennsylvania net metering credits remain in force and are the largest single factor in most payback calculations I run. If the billing side is new to you, start with our plain-English explanation of net metering.
Philadelphia’s city rebate, if the property is inside city limits.
Section 48E for businesses, farms, and nonprofits. Different section of the code, still 30%, plus depreciation. Nonprofits and municipalities can use elective pay, which we walk through in our guide for townships and school districts.
One caution: Commercial energy property under 48E has its own basis rules, and they are not the same as Section 25D. Do not assume the reinforcement answer transfers. Ask your tax advisor.
My advice has not changed with the tax law. If an engineer says the roof needs reinforcement, do it.
Solar racking adds roughly two and a half to four pounds per square foot. That is not much. On older framing, long spans, notched rafters, or a roof already carrying two layers of shingles, it is enough to matter.
Engineers here also account for winter loading, which is a separate question from whether panels keep producing under snow. A structural failure under a 25-year array costs far more than the reinforcement quote.
The sequencing point I push hardest: if the roof has under ten years left, replace it before installing solar panels. Removing and resetting an array later runs a few thousand dollars.
Doing it once is cheaper than doing it twice, and that math held even when the tax credit existed. Once the array is up, keeping the system maintained is far less work than dealing with a roof you should have addressed first.
No, reinforcement does not qualify. Sistering rafters, reinforcing trusses, added blocking, new decking, and roof replacement all primarily serve a roofing or structural function. The IRS excludes them even when the work is required to support solar panels.
Two roof items do qualify. Mounting hardware, meaning racking, rails, standoffs, lag bolts, and flashing at penetrations. And solar roofing tiles or solar shingles, which serve as solar electric collectors while performing the function of traditional roofing.
Getting the split right is worth real money. On a $31,500 project carrying $6,000 of reinforcement, correct allocation is the difference between a defensible $7,650 credit and a $9,450 claim you cannot support.
The credit is gone for purchases. The One Big Beautiful Bill Act ended Section 25D for property placed in service after December 31, 2025. Systems operational on or before that date still claim it on IRS Form 5695, and any amount above your tax liability carries forward.
Pennsylvania incentives remain. PECO’s rebate continues under Act 129 Phase V through May 31, 2031, alongside net metering credits, SRECs, and the Section 48E federal investment tax credit through a lease or power purchase agreement.
Roof condition, structural capacity, and incentive timing move a Pennsylvania solar project’s numbers more than panel brand does. All three are easier to handle before design than after.
TerraSol Energies handles engineering, permitting, interconnection, and PECO rebate paperwork across Chester County, Delaware County, and the wider PA, DE, NJ, and MD region.
If you are still weighing whether you can claim a solar tax credit for structural roof reinforcement, send me the engineer’s letter and the contractor’s quote, and I will tell you how I would split the scope.
No. Sistering rafters, reinforcing trusses, adding blocking, and installing new decking serve a structural function for the building and are not qualified expenses under Section 25D, even when required to support solar panels. Only mounting hardware and solar roofing products qualify.
No. Traditional roofing materials including shingles, underlayment, decking, and metal roofs are not eligible. Solar roofing tiles and solar shingles do qualify because they generate electricity and serve as roofing.
Not for homeowners paying cash or financing with a loan. Section 25D ended for property placed in service after December 31, 2025. Section 48E remains and reaches homeowners through leases and power purchase agreements.
Yes. If it was placed in service on or before December 31, 2025, claim it on IRS Form 5695 with your 2025 tax return.
The unused portion carries forward to a later tax year for systems that qualified before the credit ended.
Commercial rules differ, and the analysis depends on facts. Do not assume the residential answer applies. Ask your tax advisor.
TerraSol Energies, Inc. develops and manages turnkey solar solutions that provide renewable energy means for homeowners, business owners, and non-profits.
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