Is Solar Worth It After the Federal Credit Ended?
For more than a decade, federal tax incentives played a central role in marketing residential rooftop solar across the United States. Following the expiration of the federal tax credit for expenditures made after December 31, 2025, homeowners must evaluate solar economics on an unsubsidized basis. Determining whether solar makes financial sense now requires examining upfront installed costs, local utility electric rates, grid export compensation, and physical property characteristics.
The legal framework: Expiration of Section 25D
The primary federal incentive for residential solar was the Residential Clean Energy Credit under Internal Revenue Code Section 25D. According to official IRS guidance, Section 25D applied to qualifying expenditures made through December 31, 2025. It is not available for expenditures made after that date.
Homeowners who installed systems before the expiration date may still claim unused credit carryforwards on future tax returns, subject to IRS rules and personal tax liability. However, for any new solar project initiated today, no federal residential tax credit exists. Consumers should be cautious of sales pitches claiming that federal tax incentives remain active for new purchases. Always verify tax rules directly on the official IRS website or consult a qualified professional.
Unsubsidized solar economics and payback sensitivity
Without federal subsidies, the financial return of a solar array depends entirely on the value of the electricity it generates relative to the upfront capital outlay. The industry standard benchmark for evaluating system cost is the installed price per watt of direct current capacity ($/W DC).
Gross system cost equals total rated wattage multiplied by the installer's price per watt:
Total System Cost ($) = System Size (kW) × 1,000 Watts/kW × Installed Cost per Watt ($/W)
For example, a standard 7.0 kW system priced at $2.80 per watt requires a total cash investment of $19,600. To recover that investment, the system must generate enough electricity over its operating life to offset grid power purchases. You can explore how system capacity and upfront costs interact using an online solar payback calculator.
Because financial returns depend on local utility rates and sun exposure, the time required to recover upfront costs varies widely. To illustrate this relationship, consider a hypothetical 7.0 kW residential system that generates 9,450 kWh during its first year of operation (1,350 kWh per kW DC). All figures below are fictional examples designed for educational analysis.
The table below models simple payback timelines across three installed cost levels ($2.50, $3.00, and $3.50 per watt) and three volumetric electricity rate environments ($0.14, $0.18, and $0.24 per kWh), assuming 100% of generated power offsets grid electricity at the full retail rate:
| Installed Cost per Watt | Total Net Cost (7 kW System) | Payback at $0.14/kWh (Year 1 Savings: $1,323) | Payback at $0.18/kWh (Year 1 Savings: $1,701) | Payback at $0.24/kWh (Year 1 Savings: $2,268) |
|---|---|---|---|---|
| $2.50 / Watt | $17,500 | 13.2 Years | 10.3 Years | 7.7 Years |
| $3.00 / Watt | $21,000 | 15.9 Years | 12.3 Years | 9.3 Years |
| $3.50 / Watt | $24,500 | 18.5 Years | 14.4 Years | 10.8 Years |
As this sensitivity analysis demonstrates, an unsubsidized system installed at a competitive price in a high-rate utility territory can still achieve simple payback in 8 to 10 years. Conversely, paying a premium price per watt in an area with low electricity rates can extend the payback period beyond 15 years. Understanding these financial dynamics is detailed further in our guide to solar payback period explained.
Estimating production accurately with NREL PVWatts
Solar generation varies significantly based on geographic latitude, roof slope, compass orientation, and shading. Rather than relying on optimistic estimates from sales representatives, homeowners should verify potential production using the PVWatts calculator developed by the National Renewable Energy Laboratory (NREL).
PVWatts is a free public modeling tool that incorporates historical weather and solar irradiance data. When using the tool, you input your physical address, system capacity, module efficiency type, array tilt, and azimuth (compass heading). South-facing roofs (180 degrees azimuth) generally maximize annual energy production in North America, while west-facing orientations capture valuable late-afternoon sun.
The calculator incorporates standard system losses—such as wiring resistance, soiling, and inverter conversion losses—which typically total around 14%. Furthermore, solar panels experience slow degradation over time, commonly modeled around 0.5% loss of generating capacity per year, though specific manufacturer warranties vary. Over a 25-year lifespan, inverters may also need replacement, which should be factored into long-term financial expectations.
State, local, and utility incentives: Checking DSIRE
Although the federal residential tax credit ended after 2025, regional financial incentives may still exist in certain areas. State energy offices, municipal governments, and electric utilities occasionally offer upfront rebates, performance payments, or Solar Renewable Energy Certificates (SRECs).
The most comprehensive resource for researching available programs is the Database of State Incentives for Renewables & Efficiency (DSIRE), managed by the N.C. Clean Energy Technology Center. On DSIRE, you can search by your ZIP code to identify local utility rebates, property tax exemptions for solar equipment, and sales tax incentives. State-administered home energy rebate programs funded through federal legislation may also operate in select regions. However, incentive availability varies substantially, and homeowners should confirm current eligibility directly with program administrators before committing to a purchase. Learn more about current programs in our guide to home energy upgrades and incentives after 2025.
Evaluating financing structures: Cash, loans, leases, and PPAs
How you finance a solar installation significantly impacts its overall financial return. Homeowners generally choose between direct ownership and third-party arrangements.
- Cash purchase: Paying cash requires the highest upfront capital outlay but eliminates interest charges, dealer fees, and financing overhead. A cash purchase avoids financing charges, but compare the total cost of each option, including any interest, fees and incentives.
- Solar loans: Financing through a bank, credit union, or specialized solar lender allows you to own the system with little or no upfront cash. However, loan interest and origination fees (dealer fees) add thousands of dollars to the total project cost, stretching out the effective payback timeline.
- Solar leases and PPAs: Under a lease or Power Purchase Agreement, a third-party company owns and maintains the equipment. You pay a fixed monthly fee or a set price per kilowatt-hour generated. While leases require no upfront investment, they often include annual payment escalators (such as 1% to 3% annually). Leases can also complicate future home sales, as buyers must qualify and agree to assume the contract.
Roof condition, tree shading, and property constraints
Before installing solar panels, assessing the physical condition of your roof is paramount. Warranties differ by manufacturer, so read the written terms for the panels and inverter. If your roof is near the end of its life, ask installers how a roof replacement would be handled, because it can add cost and timing issues.
Removing and reinstalling a rooftop solar array to accommodate a roof replacement can cost several thousand dollars in labor alone. If roof replacement is needed within the next decade, completing that work prior to solar installation is generally the most economical path.
Similarly, mature trees that cast heavy shade on south- or west-facing roof planes will drastically impair system output. Minor shading across even a small portion of a solar string can reduce production across connected panels. Finally, older homes may have 100-amp electrical service panels that require a service upgrade to 200 amps to handle solar backfeed safely.
The quoting process: Getting at least three competitive bids
Equipment pricing and installation markups vary widely among contractors. Soliciting competitive proposals from at least three licensed solar installers is essential for securing a fair price.
When collecting quotes, use this evaluation checklist:
- Compare $/W cash pricing: Request the total gross cash price before financing fees to compare quotes on an objective dollar-per-watt basis.
- Examine equipment specifications: Review the exact brand, model, and wattage of the solar panels and inverters (microinverters versus string inverters with optimizers).
- Verify warranty terms: Confirm the duration of the manufacturer equipment warranties, inverter warranties, and the installer's workmanship warranty covering roof penetrations.
- Avoid high-pressure tactics: Be wary of door-to-door sales representatives promoting "free solar" or urging you to sign a contract on the spot. Legitimate installers provide detailed written engineering proposals and allow ample time for review.
Common mistakes
- Believing expired federal tax credits still apply: Falling for outdated marketing claims that promise a federal credit for new solar installations made after December 31, 2025.
- Relying entirely on installer production claims: Failing to verify proposed annual kilowatt-hour generation using NREL PVWatts.
- Installing panels on an aging roof: Overlooking necessary roof repairs before installation, leading to costly panel removal and reinstallation expenses later.
- Overlooking utility export rules: Assuming excess electricity will be credited at full retail value without researching local net metering tariffs.
- Signing a lease without reviewing escalator clauses: Overlooking annual payment increases in lease contracts that could eventually push solar payments above utility electric rates.
Bottom line
Rooftop solar remains a viable home energy investment in regions where electricity prices are high, sunlight is abundant, and utility export rules remain favorable. Without federal tax credits, however, achieving an attractive financial return requires disciplined shopping, securing competitive installed pricing, and verifying roof suitability. Homeowners who obtain multiple quotes and verify production projections can make sound financial decisions tailored to their property.
This article is provided for educational purposes only and does not constitute financial, investment, tax, or legal advice.