Solar Payback Calculator
Find out how many years until your solar investment pays for itself — and how much you'll save over 25 years.
Savings Breakdown
Cumulative Savings Timeline
| Year | Annual Savings | Cumulative Savings | Net Position |
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Frequently Asked Questions
What is a good solar payback period?
The national average solar payback period in the US is 6–12 years, with most homeowners recovering their investment in 7–9 years. After payback, the system generates free electricity for 15–20 more years (25-year panel warranty). Shorter payback periods occur in states with high electricity rates (Hawaii, California) or strong state incentives.
How does the 30% federal tax credit affect payback?
The Residential Clean Energy Credit (Section 25D) gave a 30% credit on the total installed cost — cutting a $20,000 system to an effective $14,000 and shaving 2–3 years off payback. Important for 2026: this credit ended on 31 December 2025 under the One Big Beautiful Bill Act, so for a homeowner buying in 2026 the federal credit is 0% — leave the "Apply 30% ITC" box unticked. It still applies if your system was placed in service by 31 December 2025 (claim it on your 2025 return), and a lease or PPA provider can still claim a business version. Tick the box only to model those cases.
Does solar increase home value?
Yes. A 2021 Zillow study found homes with solar sell for about 4.1% more on average. Lawrence Berkeley National Laboratory data shows buyers pay a premium of roughly $4/watt for solar. This added resale value effectively reduces your net cost and payback period further.
What reduces my annual savings?
Panel degradation (0.5% per year output loss), rising electricity rates partially offset by inflation, and net metering changes by your utility. Some utilities have reduced export rates for excess solar, lowering savings for systems that produce more than you use.
Do I need a solar loan or cash purchase?
Cash purchases have the shortest payback. Solar loans carry interest that extends the payback period — subtract annual loan interest payments from your annual savings to get net savings. Leases and PPAs typically have no payback period since you don't own the system, but you won't benefit from the tax credit or home value increase.