Home / Calculator · Updated 2026-11-04

Rooftop Solar Subsidy Calculator: Cost After Subsidy and Payback

Enter the size, the quote and your bill. The subsidy comes from the official rates; the payback uses your own estimate of how much of the bill the system removes.

Calculator

For 3 kW the central subsidy is ₹78,000.

Central subsidy
₹78,000
Cost after subsidy
₹1,22,000
Payback
4.2 years

Your quote works out to ₹66,667 per kW. You pay the full quote first; the subsidy is paid back to you afterwards. The savings figure is your own assumption (the share of your bill the system removes), not a measured result, and it ignores tariff changes, loan interest and maintenance.

How it works

  • Subsidy: the central rates, capped at 3 kW. State top-ups are not included.
  • Cost after subsidy: your quote minus the subsidy.
  • Payback: cost after subsidy divided by (monthly bill × 12 × the share you enter). It is a rough guide, not a guarantee.

Not sure what a fair quote is? See the benchmark cost.

Sources