Short answer: in 2026, a typical 7 kW home solar system costs roughly $18,000 to $22,000 before incentives, and for most buyers the "after incentives" price is now close to that same number. The 30% federal tax credit for homeowner-owned systems (Section 25D) ended on December 31, 2025, so the biggest discount many guides still quote no longer applies to systems you buy with cash or a loan. Whatever you save now comes from state, local, and utility programs, which vary a lot by address.
This guide walks you through the math in six steps, so you can turn a quote into a real net price and a realistic payback estimate. Last updated: October 2026.
Key takeaways
- The federal homeowner credit is 0% for systems bought and installed in 2026 or later. Completion date, not contract date, decides eligibility.
- Published 2026 averages differ by source, from about $2.60 to $3.30 per watt, so a 7 kW system lands between roughly $18,000 and $23,000.
- Your net price depends mostly on where you live: state tax credits, sales or property tax exemptions, and utility rebates.
- Financing usually raises the total you pay. One 2026 price guide puts a 7.2 kW system at $21,816 cash versus $26,004 with a loan.
- Use the calculator below with your own quote. Its starting numbers are editable examples, not real data.
What's in this guide
- What you need before you start
- Step 1: Know what changed with the federal credit
- Step 2: Estimate your gross price
- Try it: net cost and payback calculator
- Step 3: Subtract the incentives that still exist
- Step 4: Add the costs people forget
- Step 5: Compare cash, loan, and lease or PPA
- Step 6: Sanity-check your quote and payback
- Troubleshooting
- Your next step
What you need before you start
Gather these first. Even rough numbers are enough to begin.
- Your last 12 months of electricity usage in kWh (a kilowatt-hour is the unit your utility bills you for). Your online account usually shows it.
- Your average price per kWh, from the same bill.
- Any written solar quote you've already received, showing system size in kW and total price.
- Your state and utility name, so you can look up local programs in Step 3.
You're done with this step when you have one number for yearly kWh used and one for your price per kWh.
Step 1: Know what changed with the federal credit
For years, the Residential Clean Energy Credit (Section 25D) returned 30% of a homeowner's system cost as a federal tax credit. The One Big Beautiful Bill Act, signed July 4, 2025, ended it for expenditures after December 31, 2025. There was no phase-down.
What that means in practice:
- Buying with cash or a loan in 2026: no federal credit.
- Installed and operating by December 31, 2025: the credit applied, and any unused amount can generally carry forward to later tax years.
- Signed in 2025 but finished in 2026: industry summaries of IRS guidance say the completion date controls, so this system would not qualify.
- Leases and power purchase agreements (PPAs): the company that owns the system can still claim a business credit (Section 48E), which industry sources describe as available through 2027. Whether savings reach you depends on the contract.
You're done with this step when you can say whether your system would be owned by you (no federal credit) or by a third party (possible indirect benefit).
Step 2: Estimate your gross price
Installers quote in cost per watt: total price divided by system size in watts. It lets you compare a 5 kW quote against a 9 kW quote fairly.
Published 2026 figures differ because they use different data. EnergySage reports about $18,340 for a 7 kW system from marketplace quotes. ConsumerAffairs lists a national average of $19,873 and a typical $2 to $3 per watt. SolarReviews gives $21,816 for a 7.2 kW system, or $3.03 per watt. Treat all of these as ranges, not promises.
The table below is simple arithmetic at $2.60 to $3.40 per watt, an illustrative example that spans those published figures:
| System size | At $2.60 per watt | At $3.40 per watt | Often fits |
|---|---|---|---|
| 5 kW | $13,000 | $17,000 | Smaller homes, lower usage |
| 7 kW | $18,200 | $23,800 | Typical mid-size home |
| 10 kW | $26,000 | $34,000 | Larger homes, electric heating or EVs |
Pro tip: larger systems usually cost less per watt, because fixed costs like design, permits, and labor are spread over more panels. A small system can carry a noticeably higher per-watt price.
To size a system roughly, divide your yearly kWh by about 1,200 to 1,500. That output-per-kW range is an assumption that varies with sunshine, roof angle, and shading; an installer's production estimate for your roof is better.
You're done with this step when you have a gross price from a real quote, or a range from the table.
Try it: net cost and payback calculator
Enter your own numbers below. The starting values are editable examples, not real data for your home.
Estimate only. Savings assume the system's output offsets electricity at your full retail price; your utility's net metering rules and your actual usage can change that.
You're done with this step when you've run the calculator once with your quote and once with a more cautious yearly output or a lower electricity price.
Step 3: Subtract the incentives that still exist
Look up each category for your state and utility. Use the official program page, since amounts, caps, and deadlines change.
- State income tax credits. Offered by a minority of states, usually as a percentage of cost with a cap. Check your state tax agency or energy office.
- Sales tax exemptions. Some states don't tax solar equipment, which lowers your price without a form to file.
- Property tax exemptions. Some places don't raise your property tax assessment when solar adds home value.
- Utility or local rebates. Often fixed dollar amounts, and sometimes funded until the money runs out.
- Net metering or similar export credits. These don't cut the purchase price, but they set how much your extra daytime power is worth. Rules differ by utility and have been changing in several places.
- Leftover federal credit. Only if you installed by December 31, 2025 and have unused credit carrying forward.
You're done with this step when each incentive you found has a dollar amount or percentage, a source page, and a note on whether it needs paperwork from you.
Step 4: Add the costs people forget
An "after incentives" price can look low until these show up:
- Battery storage. Often a separate, large line item. Without the federal credit, it is no longer discounted by 30% for homeowner-owned purchases.
- Roof repair or replacement. Panels last for decades, so an aging roof is cheaper to fix before installation than after.
- Electrical panel upgrades. Older homes may need one to connect the system.
- Loan fees and interest. These are the most commonly missed, and they sit in the next step.
- Inverter replacement. Inverters often wear out sooner than panels. Ask about warranty length and replacement cost.
You're done with this step when your quote has a line for each item above, even if the line says "not needed."
Step 5: Compare cash, loan, and lease or PPA
| Option | Who owns the system | Upside | Watch out for |
|---|---|---|---|
| Cash | You | Lowest total cost; keeps state and local incentives | Large upfront payment; no federal credit in 2026 |
| Loan | You | Little or no money down; you own the asset | Interest and dealer fees raise the real price (one guide shows $26,004 vs $21,816 cash for 7.2 kW) |
| Lease or PPA | The company | No purchase price; the owner may claim the business credit | Payment escalators, contract length, and complications if you sell the home |
Common mistake: comparing a loan's monthly payment with your electric bill and ignoring the total repaid. Compare total cost over the full term instead.
You're done with this step when you can state each option's total cost over the contract or loan term in one number.
Step 6: Sanity-check your quote and payback
- Get at least three quotes with the same system size so price per watt is comparable. If one is far above or below the rest, ask what explains it.
- Check the production estimate. A 7 kW system in a sunny region can produce roughly a third more than the same system in a cloudier one, so local sunshine matters more than any national average.
- Run the calculator with a conservative case. Lower the yearly output by 10% and use your lowest realistic electricity price.
- Read the contract for the warranty on panels, inverter, and workmanship, and for who handles permits and utility interconnection.
Payback periods vary widely across homes, so compare yours to the roughly 7-to-12-year range some guides cite only as a rough benchmark, not a forecast. Solar is generally a better fit when you have a sunny, unshaded roof, higher electricity prices, and plan to stay for years. It's a weaker fit with heavy shade, a roof near replacement, or a short time horizon.
Financial note: this article is general information, not tax, legal, or financial advice. For your situation, confirm incentives with official program pages and consult a qualified tax professional.
Troubleshooting
"My installer says I can still claim 30%."
Ask which tax code section applies and who claims it. For a system you own and finish in 2026 or later, the homeowner credit is gone. A lease or PPA may involve a business credit claimed by the owner, which is not the same thing as a credit on your tax return.
"I signed a contract in 2025, but installation finished in 2026."
Industry summaries of IRS guidance say the completion date controls, not the signing or payment date. Ask your installer for the written "placed in service" date and confirm with a tax professional.
"My calculator payback looks too good."
Check that the electricity price is realistic, that you haven't entered the same rebate twice, and that yearly output is not set too high. Then add the extra costs from Step 4 and any loan interest.
"My quote is much higher than the averages here."
Possible reasons include a smaller system (higher price per watt), premium panels or microinverters, a battery bundled in, roof work, or a high-cost region. Ask for an itemized quote.
"I can't find any local incentives."
Start with your state energy office and your utility's website. If nothing exists, your net price is simply the gross price, and your decision rests on bill savings alone.
Your next step
Request three itemized quotes for the same system size, then plug each one into the calculator above with your real electricity price. The comparison will show you the quote that is actually cheapest after incentives, not just the one with the lowest headline price.
Sources referenced: EnergySage (7 kW system cost, 2026), SolarReviews, ConsumerAffairs, and solar.com's summary of the federal credit's end. Prices and programs change, so verify with official sources before you sign.