Solar and battery payback calculator
The federal 25D tax credit ended on December 31, 2025. This runs your real payback under the 2026 rules: cash purchase with no credit, or lease and PPA where the 48E credit still lowers your rate through 2027.
Payback —
Year 1 savings —
Net savings over 25 years —
Cumulative net savings across 25 years (your inputs, your browser).
How this is calculated
We grow your current bill by the yearly price increase you set, apply the share the system covers as savings, and for a cash purchase subtract your out of pocket cost. Payback is the point where cumulative savings cover that cost. For a lease or PPA there is no upfront cost, so the question is whether your yearly bill savings beat the lease payment.
This is an estimate to help you decide, not financial or electrical advice. Real results depend on your utility rate plan, sun, system design and installer quote. Always confirm with a certified installer.