Is There a Solar Tax Credit in 2026? What Changed

The question in the title has a clear answer for a home being fitted with rooftop solar right now, and it is not the answer most of the internet still gives. The federal Residential Clean Energy Credit under Internal Revenue Code section 25D, the 30 percent credit that homeowners had been claiming on rooftop systems for years, was terminated early by Public Law 119-21, which was enacted on July 4, 2025. In the IRS’s own words, the credit “is not available for any property placed in service after December 31, 2025.”

That single sentence reshapes the purchase side of the solar decision, and this briefing exists because WattBarn had 46 articles about solar and no page that told you plainly what happened to the incentive. What follows is the honest version: what the credit was, what the placed in service test actually means, the narrow situation where the credit is still in play, the questions that are genuinely not answerable here, and what remains at the state, utility and municipal level. It also rebuilds the economics without a federal credit in them, because a payback figure calculated with a credit that no longer applies is worse than no figure at all. Put your own numbers into the savings calculator as you read.

The short answer for a 2026 installation

If your rooftop system is completed during 2026, there is no federal residential clean energy credit for it. The credit that homeowners had been claiming under section 25D was terminated early by Public Law 119-21, enacted on July 4, 2025, and the IRS states that the credit is not available for any property placed in service after December 31, 2025. There is no partial version, no reduced percentage described here, and no phase-down schedule quoted here, because inventing one would be worse than saying plainly what the rule says.

That is a hard thing to read if you have spent months modelling a purchase around a 30 percent reduction. It is also the single most useful fact this briefing can give you, because every downstream decision, the size you buy, the price you accept, the financing you use and the timeline you expect, changes when the largest single incentive in the model disappears. A quote that still subtracts a federal credit is describing a world that ended, and the gap between the two versions is large enough to change whether a particular deal makes sense at all.

The rest of this briefing works through why the date matters so much, who is genuinely still affected by the old rule, and what is left in its place. None of it is tax advice, and the whole topic is one where a qualified tax professional looking at your own paperwork is worth more than any national explanation.

What the federal residential credit was

For context rather than nostalgia, it helps to understand what the mechanism actually did, because that shapes what a replacement would have to look like. The residential clean energy credit under section 25D was a credit against federal income tax, calculated as a percentage of qualifying expenditure on a residential clean energy system, and claimed by the owner of the system through their own return.

Two features of that structure did most of the work. First, it was a percentage of cost rather than a fixed amount, so it scaled with the size and price of the system and stayed proportionate whether someone bought a small array or a large one. Second, it was federal, which meant a single rule applied across every state, and a national article, a national quoting tool and a national payback calculator could all use the same number without qualification.

Both of those features are exactly what is now missing. What remains is a patchwork of state, utility and municipal programmes that are not proportionate to system cost in any consistent way, that differ from one service territory to the next, and that cannot be reduced to a single national percentage. The mechanism did not shrink so much as fragment, and the practical consequence for a buyer is that finding out what applies has become local research rather than a known constant.

What placed in service means

The phrase carrying all the weight is placed in service, and it is worth slowing down on because most of the confusion in this topic comes from assuming it means something else. The IRS states that an expenditure is treated as made when the original installation is completed. Completion of the installation is the event the rule keys on.

That is a physical and administrative milestone rather than a financial one. It is about the system being finished and in place, not about money having changed hands. A homeowner who paid a large deposit in one year and whose crew finished the job in the next has an expenditure treated as made in the second year, not the first, under the wording the IRS has given.

The reason this matters so much right now is that the cut-off falls at the end of a calendar year, so a project spanning that boundary lands entirely on one side of it. There is no proportioning, no splitting by how much of the work happened in which year, and no credit for having started early. The completion date is the fact that decides it, and it is a fact worth knowing precisely rather than approximately.

Where the facts of a particular project are messy, and they often are, the question of when installation was completed is exactly the sort of thing a qualified tax professional exists to answer.

Completed, not ordered or paid for

It is worth stating the negative version explicitly, because each of these is a genuine assumption people make. The date you signed a contract is not the test. The date you paid a deposit is not the test. The date the installer ordered your panels, the date the pallets arrived at your house, and the date you were placed on the installation schedule are not the test either.

None of those are arbitrary distinctions. A contract is a commitment to buy, a deposit is a payment, and delivery is a logistics event, but the IRS treats the expenditure as made when the original installation is completed. That is a single, checkable milestone, which is presumably why it was chosen. It also means that the part of the process most within your control, deciding and signing, is not the part that decides the year.

The practical consequence for anyone caught by the boundary is uncomfortable, and worth naming rather than glossing over. Someone who signed well before the cut-off and whose project slipped for reasons entirely outside their control, a permit queue, a utility interconnection backlog, a roof problem discovered on site, an equipment delay, may find that the slip moved the project across the line. That is a difficult situation and precisely the kind that should be taken to a qualified tax professional with the full paper trail rather than resolved from an article.

If your installation finished in 2025

There is one group for whom the old rule is still live, and they deserve a clear paragraph rather than a footnote. If your original installation was completed on or before December 31, 2025, the system was placed in service in that year, and the termination of the credit for property placed in service after that date does not describe your system.

That is as far as this briefing will go, and the limit is deliberate. Whether the credit is available to a particular person for a particular system depends on facts this article cannot see: what was installed, what portion of the expenditure qualifies, whether the property is the right sort of residence, what your tax liability looks like, and how any of that interacts with the rest of your return. Those are not details to guess at.

What you can usefully do is assemble the evidence while it is easy to find. The completion documentation, the final invoice showing what was actually paid and for what, the permit records, the inspection sign-off and the interconnection approval all bear on when the installation was completed and what it consisted of. Keep them together in one place. If your installer has not given you a document that states a completion date, ask for one now rather than in a year.

Then take the folder to a qualified tax professional. That is the correct next step, and it is a much better use of your time than reading any more national commentary on the subject.

Placed in service versus the year you file

These two ideas get conflated constantly, and the conflation is the source of a lot of misplaced hope. Placed in service assigns a system to a tax year. Filing is the act of submitting a return covering a tax year, and it necessarily happens after that year has ended.

So a homeowner whose installation was completed in 2025 belongs to the 2025 tax year, and will be dealing with the 2025 return during 2026. That is entirely normal and is not a loophole, an extension or a second chance. It is simply how tax years and filing work. The important corollary is the one that runs the other way: filing a return during 2026 does nothing at all for a system completed in 2026, because the system belongs to the later year regardless of when any paperwork is submitted.

You will see this misunderstood in both directions. Some people assume that because they are filing in 2026, a 2026 installation is somehow in scope. Others assume that because the credit ended, a 2025 installation is retroactively out of scope. Neither follows. The year the installation was completed is the anchor, and the filing calendar simply runs behind it.

This briefing gives no filing instructions, names no forms and describes no mechanics of claiming, because those are specific to your circumstances and because being confidently wrong about them would cost you real money. A qualified tax professional is the person for that conversation.

Leases and power purchase agreements are a separate question

If the panels on your roof belong to a solar company under a lease or a power purchase agreement, the question you are asking is about somebody else’s tax position, not your own. The homeowner in those arrangements is buying the use of equipment or the electricity it produces, and the company that owns the hardware is the one whose tax treatment is in play.

WattBarn cannot tell you what that treatment is. The rules covering third-party-owned and commercially owned systems are not the same rules as the residential provision described above, a company’s own circumstances are not visible from outside, and any confident claim here would be a fabrication. What can be said honestly is that a homeowner should not assume either that a provider’s incentive position is unchanged or that it has changed, and should certainly not accept a claim about it as the reason a particular deal is attractive.

The useful move is to price the arrangement on its own terms. A lease or a power purchase agreement is a stream of payments over a long period, usually with an escalator, and that stream can be compared directly against the cost of owning an equivalent system. Our lease versus buy briefing works through the comparison, and our quote reading briefing covers what to extract from a proposal before you can compare anything at all. Ask the provider, in writing, how they treat the arrangement, and take the answer to your own adviser.

Commercial and utility-scale rules are outside this briefing

The same discipline applies to anything larger than a house. Business, commercial and utility-scale clean energy incentives sit under different provisions, with different eligibility, different timing rules and different administrative requirements, and none of what is written above about a residential provision should be read across to them.

This is not evasion, it is accuracy. A homeowner reading a residential rule and applying it to a small business installation, a farm, a rental portfolio or a community project would be reasoning from the wrong text. Anyone in that position needs advice specific to the structure they are actually operating within, from a professional who can see it.

If you are looking at solar for a property that is not simply your own home, treat every figure and rule in this briefing as background context on the residential side rather than as guidance for your project. Then get proper advice. The cost of that advice is small relative to the size of the decisions it informs.

Why a 2026 quote may still show an after-credit price

Expect to see it, and know what to do when you do. Sales decks, proposal templates, pricing spreadsheets and comparison websites were all built during the years when the federal credit applied, and material like that gets updated slowly and unevenly. A number printed in a proposal is a claim by a salesperson, not a determination by anyone with authority.

There is also a structural reason the after-credit figure survives in marketing. A price that has already had 30 percent removed looks dramatically better than the gross figure, and a proposal that leads with the smaller number wins more comparisons. That incentive to keep the old framing does not disappear just because the underlying rule changed.

Your protection is simple and it costs nothing. Ask every installer for the gross installed price, before any incentive of any kind is subtracted. Then ask them to itemise separately each incentive they have assumed, name the body that administers it, and state plainly whether it is confirmed for your address or merely expected. Compare bids on the gross number, because that is the figure the installer actually controls.

Our installer choosing briefing covers the wider set of questions worth asking, and the cost briefing covers what installed prices are built from.

How to read a quote that assumes an incentive

Beyond asking for the gross price, there are a few specific things to look for in any proposal that leans on incentives. The first is whether the incentive is described with a name and an administering body or merely as a category. “State rebate” is not a programme, and a proposal that cannot name the programme has not checked it.

The second is whether the quoted amount is a maximum or an expectation. Many programmes cap what any one household can receive, or scale the amount by system size, income or equipment type, and a proposal that quotes the ceiling as though it were the outcome is describing the best case as though it were the base case.

The third is timing. An amount that arrives as a reduction at purchase does something quite different to your finances from an amount that arrives months later through a tax return or a rebate cheque, especially if you are financing the purchase. Our solar loan briefing covers the case where a loan is structured around an expected incentive that has not yet arrived, which is a specific trap worth understanding before you sign.

The fourth is what happens if the incentive does not materialise. Ask directly whether the price changes, whether the contract lets you withdraw, and who carries the shortfall. A good installer will have a straight answer. Run the deal through the savings calculator with the incentive set to zero, because that is the version you need to be comfortable with.

The four shapes a surviving incentive can take

What remains after the federal residential credit is a set of local programmes, and although the details differ enormously, they come in a small number of recognisable shapes. Knowing the shapes is more useful than knowing any particular programme, because the shape tells you what the money does.

A state or local income tax credit reduces a tax liability rather than a purchase price. It is claimed through a return, it usually depends on your having a liability for it to offset, and it arrives on the tax calendar rather than at installation.

A rebate reduces the cost of the system. It may be applied by the installer at the point of sale, or paid to you after installation and inspection. Either way it reaches you regardless of your tax position, which is a meaningful difference for many households.

A performance payment pays for output rather than for the purchase. It is tied to what the system actually generates, usually per unit of electricity produced, and it arrives over time rather than at once. Certificate markets are the most familiar version, and our certificates briefing covers how those work in detail.

A property or sales tax exemption removes a tax that would otherwise apply, either on the added value of the system each year or on the purchase itself. It does not put money in your hand; it stops money leaving it. Our property tax briefing covers the annual version at length.

A credit and a rebate do different things to your money

The distinction between the first two shapes is the one most worth understanding properly, because the two words get used interchangeably in sales conversations and they are not interchangeable at all.

A rebate lowers the net cost of the system. Take an illustrative gross installed price of $23,200. A $1,000 rebate leaves a net cost of $22,200, and that reduction happens whether the household pays a large amount of income tax or none at all. It flows through the purchase.

A credit reduces tax owed. The same $1,000 as a credit is worth $1,000 only to a household with at least that much liability for it to offset. For a household with a smaller liability, or none, the value can be less, and how much less depends on rules specific to the programme and on the rest of your tax position. That is why this briefing keeps returning to the same recommendation: a qualified tax professional can tell you what a credit is worth to you, and nobody else can.

There is a cash flow difference too. A rebate applied at purchase reduces what you finance. A credit claimed through a return arrives later, sometimes much later, which matters if you borrowed the full price and are already making payments. Two incentives of identical headline size can therefore land quite differently, and the difference is worth asking about before you sign.

Who actually runs the programmes worth finding

Because there is no national residential credit to fall back on, the search moves to three levels, and it helps to know who to approach at each.

State energy offices and state revenue departments. States run the largest of the remaining programmes, usually through an energy office, an energy authority or a similar body, with tax-based incentives administered by the revenue department. The state energy office is the right first call for programme rules, and the revenue department is the authority on anything tax-shaped.

Your utility. Utilities run their own programmes, and this is the level people most often skip. Because a utility programme applies to a service territory rather than a state, two neighbours on different utilities can face different offers. Your utility’s own website and customer service line are the source, and while you are there it is worth confirming your export arrangement, which our net metering briefing explains.

Your municipality or county. Cities, counties and municipal utilities sometimes run their own smaller programmes, and these are the least visible of the three because they rarely appear in national databases. A call to the building department or the sustainability office is usually the fastest way to find out whether anything exists.

State incentive databases are useful as a starting index, particularly for vocabulary and for knowing what to ask about, but they lag programme changes. Treat the database as a map and the administering body as the authority.

How to find what applies to your own address

A workable process takes about an hour and produces something you can actually use. Start by writing down three things: your state, your electric utility as it appears on your bill, and your city or county. Those three identifiers are what every programme is organised around, and our electric bill briefing covers where to find the utility and rate details if you are not sure.

Next, search each level in turn rather than searching for “solar incentives” generally. A general search returns national summaries written at unknown dates. A search naming your state energy office, or your utility by name, gets you to the body that actually sets the terms.

Then verify anything you find directly with the administering body, by phone or through their own published programme documents, and write down the date you checked. A programme’s own page is the only source that reflects its current rules, and even that can trail a decision by weeks.

Finally, record what you learn in a form you can hand to an installer: the programme name, the administering body, the shape it takes from the four above, the amount or formula, any cap, the application deadline, and what documentation it requires. That single page turns a vague conversation about incentives into a specific one, and it lets you check any proposal against something you verified yourself.

The questions to ask before you sign anything

Assume nothing about an incentive until you have answers to these, in writing where possible.

• What is the gross installed price before any incentive? This is the comparison figure across bids and the one the installer controls.
• Which specific programmes have you assumed, and who administers each? A programme that cannot be named cannot be verified.
• Is each one confirmed for my address and my utility, or expected? Service territory boundaries matter more than people expect.
• Is the amount a cap or my actual expected amount? Ceilings quoted as outcomes are the most common overstatement.
• When does the money arrive, and in what form? At purchase, after inspection, or through a return, and how many months out.
• Who applies, and by when? Some programmes are installer-filed and some are homeowner-filed, and a missed window can mean waiting a year.
• Is there a funding pool that can run out? Many local programmes are first come, first served against a fixed budget.
• What happens to my price if an assumed incentive does not arrive? Get the contractual answer, not the reassuring one.
• What documentation will I need to keep? Ask now, while the paperwork is being generated rather than after.

None of these questions require you to know anything about tax. They are procurement questions, and a competent installer will answer all nine without hesitation.

A worked example with no federal credit in it

Here is the arithmetic rebuilt honestly. Every figure below is an illustration chosen for clarity, not a price, a rate or a forecast for any real household.

Take an 8 kilowatt system at an illustrative installed price of $2.90 per watt. That is a gross cost of $23,200. Because the installation is completed in 2026, the federal residential clean energy credit contributes nothing, so the starting net cost is the full $23,200.

Now the savings side. At an illustrative 1,250 kilowatt-hours per kilowatt installed per year, the system produces about 10,000 kilowatt-hours a year. At an illustrative blended value of $0.17 per kilowatt-hour for the electricity it displaces or exports, that is $1,700 a year.

Payback is net cost divided by annual savings. With no incentive of any kind, $23,200 divided by $1,700 is about 13.6 years. That is the number a 2026 buyer should be working with as their base case, and it is the number to beat rather than the number to be discouraged by.

Now layer in illustrative local incentives, one at a time. A $1,000 rebate takes the net cost to $22,200 and the payback to about 13.1 years. A state tax credit worth $1,500 after any cap takes it to $21,700 and about 12.8 years. A performance payment worth $150 a year does not touch the net cost at all; it raises annual value to $1,850 and gives about 12.5 years. All three together give a net cost of $20,700 against $1,850 a year, or about 11.2 years.

Our payback briefing works through the same fraction in more depth, including what moves each side of it.

Payback under four illustrative incentive scenarios

The striking thing about that chart is how little the individual rows move. Three separate incentives, each of a size a household would be pleased to receive, shorten the timeline by roughly a year each at most, and only the combination of all three moves it meaningfully. That is not an argument for ignoring them. It is a calibration: local incentives are worth chasing, and they are not a substitute for the thing that was removed.

What those incentives actually move

The same point looks different when you express it as a share of the purchase rather than as years.

Eleven percent against roughly thirty is the honest shape of the change, in the illustrative case where two reasonably generous local programmes both apply. In the many places where none apply, the offset is zero and the household pays the gross price.

That comparison is included for calibration rather than for grievance, and it should shift where you spend your effort. An hour spent getting a third competitive bid can move the gross price by more than an hour spent hunting for a local rebate, and the gross price is available to every buyer in every state.

Why the payback number moved less than expected

There is a mathematical reason the incentive rows barely shifted, and it is worth understanding because it applies to every version of this calculation.

Payback is a fraction, and a one-time incentive only reduces the top of it. Removing $1,000 from a $23,200 net cost is a change of about 4 percent, so the payback period shrinks by about 4 percent, which on 13.6 years is roughly half a year. Nothing about the incentive is disappointing; the base is simply large.

The other side of the fraction behaves differently, and more powerfully. Annual savings sit in the denominator, so a change there compounds across the whole timeline. Raising annual value from $1,700 to $1,850, which is what the illustrative performance payment does, is a change of about 9 percent and shortens payback by about the same proportion despite being far less money in year one.

This is why the levers that act on annual savings, your electricity rate, how much of your own production you actually use, and your export arrangement, deserve as much attention as the levers that act on price. It is also why correct sizing matters so much: a system that generates output you cannot use or export at a decent value has bought you nothing on the denominator. Our sizing briefing works through that, and the savings calculator lets you test both sides of the fraction with your own figures.

What still improves the economics when incentives do not

Strip the federal credit out and the remaining levers are unglamorous, but they are entirely within your control and none of them depend on where you live.

Competitive bidding on the gross price. The spread between bids on the same system is routinely wide enough to matter more than a local rebate. Three real bids on an identical specification is the highest-return hour in the whole process.

Right sizing rather than over sizing. Every watt you buy beyond what you can use or export at good value lengthens payback. This is the most common way a system with an excellent price per watt ends up with mediocre economics.

Understanding the export arrangement before you size. What your utility pays for exported electricity determines the value of everything beyond your own consumption, and that varies enormously. Read our net metering briefing before you fix a size.

Financing that does not eat the savings. A loan with fees and a rate high enough to consume the annual benefit turns a positive project into a neutral one. Our solar loan briefing covers the terms that do the damage.

Reducing consumption first. Every kilowatt-hour you stop using is one you do not have to generate. It is the cheapest capacity available and it shrinks the system you need to buy.

Considering whether ownership is the right route at all. If the economics of buying no longer work for your circumstances, community solar is a different structure with a different cost profile.

Ongoing production revenue is a different lever

It is worth separating two things that get lumped together as “solar incentives”, because they behave nothing alike. What this briefing has covered is the purchase side: one-time money that reduces what the system costs you. The other category is production revenue, which is ongoing money tied to what the system generates.

Certificate markets are the clearest example. Where a market exists, a system earns tradeable certificates for its output, and those can be sold for income over years rather than once at purchase. Our certificates briefing covers how that works, what drives the price and why the income is not guaranteed.

Export credit is the other, and it is the larger one for most households. What your utility credits you for electricity you send back is a running value on every kilowatt-hour you do not consume yourself, and it typically dwarfs any one-time incentive across 25 years. Our net metering briefing explains the mechanism and the variations.

The reason for keeping these separate in your own model is the arithmetic in the previous sections. Purchase-side money moves the numerator once. Production-side money moves the denominator every year. When the purchase-side incentive that dominated the model disappears, the production side becomes proportionately more important to get right, and it is the part most buyers investigate least.

Property and sales tax exemptions work differently again

The fourth shape deserves its own treatment because it is easy to overlook and easy to misread. An exemption does not pay you anything. It prevents a tax that would otherwise apply, which shows up as an absence rather than as a receipt.

A property tax exemption addresses the annual side. If a solar system raises the assessed value of a home, that increase can raise the annual property tax bill, and many jurisdictions have written exemptions specifically so it does not. Because it is annual, the cumulative effect across the life of a system can be larger than a one-time rebate, which is exactly why it gets undervalued at the point of purchase. Our property tax briefing covers the shapes those exemptions take, which vary considerably.

A sales tax exemption addresses the purchase. Where it applies, it reduces what you pay at the point of sale, and because it is usually handled inside the installer’s pricing you may never see it as a separate line. That invisibility is a reason to ask how tax was handled on any figure you have been given, rather than assuming.

Both are decided locally, by different bodies and under different rules that do not have to agree with each other. Your county or municipal assessor is the authority on the first, and your state revenue department on the second.

Batteries and other equipment are not automatic

A question that arrives quickly: what about storage, and what about the electrical work that goes with a system? The honest answer is that eligibility rules for particular categories of equipment are set by whichever programme you are looking at, and they differ.

What can be said generally is that no programme treats every piece of equipment in a project the same way. Programmes define qualifying property, and things that feel obviously part of the job to a homeowner, a main panel upgrade, a roof repair done to accommodate the array, monitoring hardware, may or may not fall inside a given definition. That is true of state and utility programmes just as it was of the federal provision.

So the correct approach for storage is the same as for everything else here: ask the specific programme, in writing, whether the equipment you are buying qualifies and under what conditions. Do not reason from what applied to panels, and do not reason from what a battery manufacturer’s marketing says. Our battery briefing covers whether storage earns its cost on its own merits, which is the more durable question, and our Powerwall cost briefing covers what installed storage actually involves.

If a battery only makes sense to you because of an assumed incentive, that is a signal to slow down. Equipment that works on its own economics is equipment you cannot be disappointed by.

Deadlines, funding pools and waiting lists

One structural difference between what was lost and what remains is worth planning around. A federal statutory credit applied to everyone who qualified. Many state, utility and municipal programmes work differently: they run against a fixed budget for a period, and when the budget is exhausted the programme stops accepting applications regardless of how well you qualify.

That creates three practical risks. The first is timing: a programme that was open when you signed can be closed by the time your installation is complete and your application is filed. The second is queueing: some programmes maintain waiting lists that roll into a future funding period, which converts an expected reduction into an uncertain one. The third is deadline: where the homeowner rather than the installer is the applicant, a filing window can be missed simply because nobody said whose job it was.

Handle all three the same way. Ask who files, ask by when, ask whether funds are limited, and ask what happens if the programme closes before your application lands. Then write the answers down with the date you got them.

And model the project without the incentive. If a purchase only works because a first-come programme comes through, you are carrying a risk you did not choose. Run it through the savings calculator at zero incentive and make sure you are comfortable with that version too.

Common misconceptions about the 2026 incentive picture

• “The credit was reduced, not removed.” For residential property placed in service after December 31, 2025, the IRS states the credit is not available. This briefing describes no reduced rate because there is none to describe.
• “I signed in 2025, so I am covered.” The IRS treats the expenditure as made when the original installation is completed. A signature date is not the test.
• “I paid a deposit before the cut-off.” Payment is not the test either, for the same reason.
• “I file in 2026, so a 2026 install counts.” Filing follows a tax year; it does not move a system into a different one.
• “My lease provider still gets a credit, so my payment reflects it.” That is a claim about a company’s tax position that no homeowner can verify. Price the contract on its payments.
• “State incentives will make up the difference.” In the illustrative case above, two reasonably generous local programmes offset 11 percent of the price. They help; they do not replace.
• “A rebate and a credit are the same thing.” One reduces cost, the other reduces tax owed, and they reach different households differently.
• “If there is no incentive, solar does not work.” The base case in the worked example still pays back inside the typical service life. It is a longer timeline, not a broken one.

Put your own numbers in

The companion alongside this briefing runs exactly the same arithmetic used above with your figures instead of the illustrative ones. You need four things you probably already have: the system size being proposed, the gross price per watt from the quote before any incentive, a reasonable annual output per kilowatt for your area, and the blended value of a kilowatt-hour where you live. The fifth input is the one you have to earn, which is the total of any one-time local incentives you have actually confirmed with the body that administers them.

Run it twice. First with that last input set to zero, which is your true base case and the version you should be willing to sign. Then with whatever you have confirmed, which shows exactly what your research bought you in years. The gap between the two is the value of the phone calls, and it is usually smaller than expected and still worth making.

If the payback figure at zero incentive is uncomfortable, the fix is more likely to be on the price or the sizing than on the incentive hunt. Get another bid, check the size against what you actually use, and confirm what your utility pays for exports. Those three moves are available everywhere and they do not depend on any programme staying open.

The bottom line

For a home solar system completed in 2026, there is no federal residential clean energy credit. Section 25D was terminated early by Public Law 119-21, enacted on July 4, 2025, and the IRS states that the credit is not available for any property placed in service after December 31, 2025. The test is when the original installation was completed, not when it was ordered, paid for or contracted, and a system finished in 2025 belongs to that year even though the return covering it is prepared afterwards.

Leases, power purchase agreements, and anything commercial or utility-scale run on different rules that this briefing deliberately does not answer, because guessing at them would be worse than declining. Take those, and anything about your own return, to a qualified tax professional with your paperwork in hand.

What remains is local and worth finding: state credits, rebates, performance payments and tax exemptions, administered by state energy offices, utilities and municipalities, in amounts and on terms this briefing cannot responsibly quote for you. Learn the four shapes, identify your state, utility and municipality, verify with the administering body, and write down what you find with the date you checked it.

Then rebuild your own model without a federal credit in it. Use the gross price on the quote, your own output and rate, and any incentive you have personally confirmed. Compare bids on the gross number, size the system to what you can actually use, understand your export arrangement before you fix that size, and treat every figure in this briefing as arithmetic rather than a prediction. Start with the cost briefing, test the timeline in the payback briefing, and settle the ownership question in the lease versus buy briefing.

WattBarn publishes this briefing to explain a change in federal law and the general mechanics of solar incentives, and not to tell you what you may claim, what any programme pays, or what any installation is worth. The system sizes, prices per watt, output assumptions, electricity values, rebate and credit amounts and payback periods above are arithmetic illustrations chosen to show how the calculation works, never measurements of a real household or forecasts of a real outcome. Nothing here is tax, legal or financial advice, no programme names, amounts or deadlines are quoted because none can be verified for a national readership, and nothing about leased, third-party-owned, business or utility-scale systems is addressed. Your own position is settled by the body administering any programme you are counting on and by a qualified tax professional who can see your contract, your completion documentation and your return before you act on any of it.