You want to know whether rooftop solar will pay for itself on your house, now that the federal rules changed for 2026. It can, but the math is tighter than the sales pitches of the last few years suggested.
Buying solar usually makes sense if you own an unshaded roof with 15 or more years of life left, pay high electricity rates, and your utility credits exported power fairly. If two of those are missing, look at cheaper fixes or community solar first.
The 30% federal credit ended for homeowner-bought systems
For years, every quote assumed a 30% federal tax credit. Under 2025 federal tax legislation (P.L.
119-21), the Residential Clean Energy Credit expired on December 31, 2025, so systems a homeowner buys and installs in 2026 or later get nothing from it.
That changes the numbers sharply. A $21,000 system that would have netted $14,700 after the credit now costs the full $21,000, which makes payback about 43% longer at the same savings.
Leases and power purchase agreements (PPAs) work differently because the installer owns the equipment. Those third-party-owned systems may still qualify for commercial credits if they meet deadlines that run into 2027, which is why many 2026 offers lean toward leases.
State and utility incentives still exist in many places: rebates, sales and property tax exemptions, and renewable energy certificate markets. Look up your state in DSIRE, the database of state incentives and net metering policies, before you accept any quote’s savings figures.
Roof, rates and export credits: what decides the payback
Roof direction and shade
Panels produce the most on unshaded, south-facing roofs. East- and west-facing slopes still work at lower output, but trees or a neighbor’s building that shade the roof between mid-morning and mid-afternoon can sink the whole case.
Roof age and structure
Panels last decades, so the roof under them should too. ENERGY STAR advises replacing an aging roof before installation, because removing and reinstalling an array for a later reroof means paying for that labor twice.
If asphalt shingles are more than about halfway through their rated life, get a roofer’s opinion first; our roof inspection checklist covers what to spot from the ground. Ask the installer to confirm the framing can carry the added weight.
Fire codes also require clear setbacks from ridges and roof edges for firefighter access. On a small or chopped-up roof, that can leave less usable area than you expect.
Your electricity rate and usage
Savings scale with what you pay per kilowatt-hour. Divide your total bill, including delivery charges, by the kWh used to get your real rate, and pull 12 months of usage; both drive every quote.
How your utility credits exported power
With full retail net metering, each kWh you export offsets one you buy later. Many utilities now credit exports at a lower rate, so the power you use while the sun is up is worth far more than what you send back.
Running the payback math yourself
The Department of Energy’s payback method is simple: divide net installed cost by yearly bill savings. Then compare the result with how long the equipment lasts.
- Net cost: the quote minus any state or utility rebates. For a purchase in 2026, do not subtract a 30% federal credit.
- Annual production: the kWh per year in the quote. Cross-check it with NREL’s free PVWatts calculator using your address and roof direction.
- Annual savings: kWh used at home times your rate, plus kWh exported times your export credit.
- Payback: net cost divided by annual savings.
The table runs that arithmetic for an illustrative 7 kW system quoted at $21,000 and producing 9,000 kWh a year. The reduced-export rows assume half the output is used at home and half is exported.
| Scenario | Electric rate | Export credit | Annual savings | Net cost | Payback |
|---|---|---|---|---|---|
| High rate, full net metering | $0.30/kWh | $0.30/kWh | $2,700 | $21,000 | 7.8 years |
| High rate, reduced export credit | $0.30/kWh | $0.08/kWh | $1,710 | $21,000 | 12.3 years |
| Mid rate, full net metering | $0.17/kWh | $0.17/kWh | $1,530 | $21,000 | 13.7 years |
| Mid rate, reduced export, $1,500 state rebate | $0.17/kWh | $0.06/kWh | $1,035 | $19,500 | 18.8 years |
Read the result against lifespan. Systems commonly last 30 years or longer, but inverters typically need replacing every 10 to 15 years, a cost your savings must also cover.
A practical cutoff: under 10 years is a strong case, 10 to 15 is marginal, and over 15 rarely justifies buying. Loan interest stretches every figure, so run the math on the total you will actually pay.
In the table, only the high-rate, full-net-metering row clears the 10-year bar. Shade from mature trees lengthens every row, because lower production cuts your savings while the price stays the same.
Buy, finance, lease or subscribe: which fits which home
| Option | Upfront cost | Who owns it | Fits best | Watch for |
|---|---|---|---|---|
| Cash purchase | Full price | You | Sunny roof, high rates, staying 10+ years | Ties up savings; no federal credit in 2026 |
| Solar loan | Little or none | You | Strong payback but no spare cash | Interest and dealer fees built into the price |
| Lease or PPA | Usually none | Installer | Decent roof, owner wants no maintenance | Annual price escalators; transfer terms when you sell |
| Community solar | Usually none | Off-site project | Renters, condos, shaded roofs | Only offered in some states and utilities |
With a lease or PPA, compare the starting price per kWh and the yearly escalator against your utility’s rate history. Twenty annual increases of 2.9% raise your price by about 77%.
Getting quotes without getting oversold
Rooftop solar is not a DIY job. Penn State Extension warns that do-it-yourself installs risk property damage and injury, and recommends getting at least three quotes from licensed, insured installers.
Line the quotes up on these points:
- Price per watt: total price divided by system size in watts. A $21,000, 7,000-watt system is $3.00 per watt.
- Production estimate: kWh per year, plus the shading and roof angle assumptions behind it.
- Savings assumptions: if a proposal assumes electricity rates rise 5% or more every year, rerun it at your utility’s actual history.
- Federal credit: any purchase quote that still subtracts a 30% credit for a 2026 install is wrong.
- Warranties: panel performance, inverter, workmanship and roof penetrations, each in writing.
- Paperwork: who files permits, inspections and the utility interconnection agreement.
Ask about outages too. Standard grid-tied systems shut off when the grid goes down to protect line workers, so reliable backup power usually means adding a battery at extra cost.
Living with panels: upkeep and safety
Routine care is light. Rain handles most cleaning; in dry, dusty areas, rinse panels from the ground with a hose on a cool morning, and hire a pro rather than climbing onto the roof.
Check the monitoring app monthly. A sustained drop compared with the same month last year, on similar sunny days, usually means shade, soiling or an inverter fault.
Panels produce live DC voltage whenever light hits them, even with the main breaker off. Leave inverter faults, wiring and any roof-level repair to the installer or a licensed electrician.
If the numbers don’t work yet
A payback over 15 years means your money works harder elsewhere first. Sealing and insulating the attic and walls cuts heating and cooling load, and it shrinks the system you would need later.
Lower-cost steps from our guide to reducing energy bills often pay back in months. Pairing them with smart devices that genuinely reduce consumption also gives you cleaner usage data for a future solar quote.
Revisit solar when you reroof, when your state adds a rebate, or when your utility’s rates jump. Each of those can move a marginal house into the clear-yes column.
