Your CPA is Leaving money on table

You Installed Solar Panels and Paid Your Taxes — So Why Is the IRS Still Holding Your Money?

What most solar homeowners never discover about Form 5695, carryforward credits, and thousands of dollars in unclaimed federal incentives

Picture this: you spent months deciding to go solar. You compared installers, read every review, wrestled with financing options, and finally watched a crew spend two days mounting panels on your roof. When tax season rolled around, you handed the paperwork to your accountant and assumed the job was done.

But what if that assumption cost you $7,500, $12,000, or more?

According to IRS data reviewed by Congress.gov, roughly half of all homeowners who claim the Residential Clean Energy Credit carry forward part or all of their credits meaning they could not use everything in year one. A large share of those homeowners never fully recover what is owed to them. Either the carryforward gets lost at filing time, or additional incentives nobody mentioned simply go unclaimed.

This article is not a simple explainer about the 30% credit. You can find those everywhere. This is about what happens after you claim the basics and why so many solar households walk away from legitimate IRS money without ever realizing it.

The Solar Tax Credit Is Not One Number — It Is a Starting Point

Every guide published by NerdWallet, EnergySage, and TurboTax covers the same ground: the federal Investment Tax Credit (ITC) under Section 25D of the tax code lets you claim 30% of your solar installation cost as a dollar-for-dollar reduction against what you owe. Install a $40,000 system, claim a $12,000 credit. Simple.

What those guides almost never address is what sits on top of that base number.

The IRS tax code includes additional income-based and location-based incentives that can stack on top of the standard 30% for eligible filers. These provisions are not loopholes. They are legitimate credits buried in the federal tax code that require substantial expertise to identify, calculate, and document correctly. Most generalist accountants — even skilled ones — simply do not work in this space often enough to know where to look. A team like Solar Tax Pros, which combines credentialed CPAs, tax attorneys, and solar industry specialists, treats this as the core of every client engagement — not an afterthought.

“The homeowners who maximize their solar investment are the ones who treat the tax side of going solar with the same seriousness they gave to choosing their panels and installer.” — Solar Tax Pros

The practical effect of this gap is significant. A homeowner who captures only the base 30% ITC on a $40,000 system walks away with a $12,000 credit. A homeowner who works with a solar-specific tax specialist and qualifies for stacked incentives could recover an additional $4,000 to $16,000 — money that vanishes completely if no one knew to pursue it.

Five Places Your Solar Tax Filing Falls Apart And What It Actually Costs You

1. The Carryforward Credit Gets Filed Once and Then Forgotten

The ITC is non-refundable. If your solar credit exceeds your tax liability in any given year, the unused balance carries forward. IRS Form 5695 instructions explicitly provide for this, and Congress.gov’s analysis of the Residential Clean Energy Credit confirms carryforwards may continue indefinitely until the entire credit is used.

Here is where it breaks down in practice. Your accountant applies whatever credit your tax liability allows in year one, notes a carryforward balance somewhere on your return, and moves on. Come next April, a different preparer handles your taxes — or your same accountant handles hundreds of other clients and does not notice the prior-year carryforward line. The credit expires unclaimed, and you lose thousands of dollars you were legally owed.

This is not a rare occurrence. IRS preliminary data for tax year 2023 showed approximately half of all RCEC recipients carried forward credits. Every one of those carryforwards represents a future filing that requires someone to actively track and apply it. Most do not.

2. Battery Storage Credits Are Mishandled or Missed Entirely

If you added battery storage to your solar system, you likely qualify for the ITC on that equipment too — even if nobody told you so. Per the IRS Residential Clean Energy Credit page, battery storage technology qualifies as long as it meets the 3 kilowatt-hour minimum capacity requirement.

Errors in this area fall into three categories: the battery cost gets bundled into the overall system cost incorrectly on Form 5695; the credit gets claimed on a battery that does not meet the capacity threshold; or the credit gets missed entirely because the preparer did not realize standalone battery storage qualified a provision that became available for systems installed after 2022.

An incorrectly filed battery credit can trigger IRS scrutiny. A missed battery credit is simply money left behind. Neither outcome serves the homeowner.

3. The “Placed in Service” Date Is Filed Using the Default Rule — Not the Best Rule

The IRS determines when your solar credit takes effect based on when your system was considered “placed in service.” The simple rule most preparers apply: the date your system became operational and started producing energy.

What most preparers do not know: the IRS also recognizes a commence-construction standard under specific guidance, where a credit can apply to the tax year in which meaningful project initiation occurred — such as a 5% deposit even if installation finished in a later year.

For homeowners with fluctuating income, timing the credit into the right tax year can produce a meaningfully larger cash refund. Choosing the wrong year by default is not a filing error — it is just a missed opportunity that a specialist would have caught.

4. State Incentives and SREC Programs Are Never Touched

The federal ITC captures most of the attention, but a substantial layer of state tax credits, Solar Renewable Energy Certificates (SRECs), utility rebates, and local programs sits largely unclaimed. The Database of State Incentives for Renewables and Efficiency (DSIRE) tracks hundreds of active programs across the country programs with deadlines, application requirements, and income eligibility thresholds that change regularly.

A generalist tax preparer does not track these programs. A solar tax specialist does. The difference, depending on your state, can amount to several thousand dollars in additional credits or ongoing SREC income that accrues over the life of your system.

5. Prior-Year Returns Were Never Revisited

Did you install your system in 2022 or 2023? Did your accountant file Form 5695 that year? Did they capture the full credit — including any bonus incentives that applied to your income and location? If you are not sure of any of those answers, you may have recoverable money on the table. The IRS FAQ on energy credits confirms that amended returns can be filed within three years of the original filing date or two years from when you paid the tax — whichever comes later.

Filing an amended return for missed solar credits is straightforward for a specialist but it requires knowing what was missed in the first place. Most homeowners never ask the question, and their general accountant has no reason to raise it.

Why Your CPA Is Not the Right Person for This? And That Is Not an Insult

This is the question most homeowners resist: if my accountant is competent, why would they miss something this significant?

The honest answer has nothing to do with competence and everything to do with specialization. A cardiologist is not the wrong doctor — they are the wrong doctor for your knee. Solar tax law sits at the intersection of federal tax code, state energy policy, utility regulation, and IRS administrative guidance, including private letter rulings that are not covered in CPA prep courses and are rarely read outside of firms that work in this space daily.

Firms like Solar Tax Pros have built their entire practice around this intersection teams of CPAs and tax attorneys who dig into IRS private letter rulings, study net metering agreements, and track state incentive databases as standard workflow. That level of scrutiny on a single client’s solar filing would take a general CPA many additional hours to replicate — hours they typically do not bill for and cannot justify for a single tax line item.

The right solution is not to replace your accountant. It is to bring in a solar-specific specialist to handle this narrow, high-value piece of your return and then hand that work product to your existing preparer ready to file. Solar Tax Pros structures its service exactly this way. No disruption to existing relationships. Just a more complete return.

What the Numbers Look Like in Practice

Here is a real-world comparison that shows the gap clearly.

Scenario: A married couple, combined income $120,000, federal tax liability approximately $22,000 per year. They install a $90,000 solar system in 2023.

What their general CPA files:

30% ITC = $27,000 credit
Applied against $22,000 tax liability = $22,000 applied year one
$5,000 carryforward noted on return
State incentives: not reviewed
Battery storage credit (they added a 10kWh battery): not separated out

What a solar tax specialist finds:

Same 30% ITC = $27,000 base credit
Additional stacked incentives based on income level, system location, and filing status: potentially $8,000–$20,000 more
Battery storage ITC properly documented and claimed separately
Carryforward tracked across all future returns until fully recovered
State SREC enrollment initiated for ongoing income
Prior 2022 return reviewed — amended if anything was missed

The difference between these two outcomes is not a technicality. For many homeowners in the $60,000–$150,000 system range, the gap between a standard filing and a specialist-reviewed filing runs from $7,500 to $25,000 or more in total recovered value.

The Clock Is Already Running! Here’s Why That Matters Right Now

The residential solar tax credit (Section 25D) ended for newly purchased systems on December 31, 2025. That is done. But what that deadline created is a window of urgency for everyone who installed solar before that date.

If your system went up between 2022 and 2025, you are entitled to the full 30% federal credit — plus any additional incentives you qualify for. And if your 2022, 2023, or 2024 returns did not maximize those credits, amended return options are still open. Amended return windows under IRS rules run three years from the original filing date. If you filed your 2022 taxes in April 2023, that window closes in April 2026 — not a distant deadline.

For commercial solar installations and third-party-owned residential systems (leases and PPAs), the Section 48E credit remains active through at least 2027. But those filings carry their own complexity around domestic content requirements, begin-construction rules, and ownership structures that demand specialist handling.

If you filed taxes for a solar system installed between 2022 and 2025 and have not had a solar-specific review done, the amended return window is closing. Every month that passes narrows your options.

Three Steps to Find Out If Your Return Was Maximized

You do not need to start over or file anything complicated to get a quick read on whether something was missed.

Pull out your prior solar tax return. Find Form 5695. Look at Line 15 — that is your claimed Residential Clean Energy Credit. Look at Line 16 for any carryforward amount. If you never saw Form 5695 attached to your return at all, the credit may not have been filed.
Check your credit against your system cost. Your base ITC should equal 30% of your qualified solar installation cost (panels, inverter, installation labor, and related equipment). If the math does not add up, something was missed or miscalculated.
Ask a specialist for a review. Solar Tax Pros provides exactly this kind of evaluation — a review of your prior filings, identification of what may have been missed, and an estimate of recoverable credits using their Solar Tax Max™ Calculator. Getting a second set of eyes on a solar filing costs nothing compared to the credits that might be sitting unclaimed.

Why Solar Tax Maximization Is a Specialty — Not a Feature

The federal push toward clean energy created enormous financial opportunity for American homeowners. It also created a tax filing landscape that is genuinely complex, updated regularly through IRS guidance, and rarely handled with full expertise by generalist preparers.

Solar Tax Pros was built specifically for this gap. The firm combines CPAs, tax attorneys, and solar industry specialists — drawing on Big Four accounting experience — to approach solar filings the way a surgical team approaches a complex procedure. Not with urgency care efficiency, but with the depth of research the situation actually requires.

That means combing IRS private letter rulings that most tax professionals have never read. Tracking state SREC programs and utility incentive databases. Identifying carryforward credits that might otherwise be lost. Filing amended returns when prior filings left credits on the table. And doing all of it in a format that slots directly into your existing tax return, whether your regular accountant handles your filing or Solar Tax Pros does it directly.

For homeowners with systems in the $30,000 to $150,000 range, the difference between a standard filing and a specialist review typically pays for itself many times over.

The Bottom Line: Your Panels Are Working. Are Your Taxes?

Every day your solar system produces electricity, it is doing exactly what it was designed to do. The question is whether the tax side of your investment is performing at the same level.

The credits are real. The carryforward rules are real. The additional incentives are real. The only variable is whether someone with the right expertise looked at your filing closely enough to find and recover everything that belongs to you.

If you have not had a solar-specific tax review done by professionals who work exclusively in this space, there is a reasonable chance the answer is no and a narrowing window to do something about it. Solar Tax Pros offers exactly this kind of review, and their Solar Tax Max™ Calculator can estimate uncaptured incentives in minutes.

You spent real money on that solar system. The IRS owes you the maximum return the law allows. Make sure you are actually getting it.