Loan Prepayment / Amortization Simulator

How this simulator works

Enter your loan amount, interest rate, and original tenure to get your standard EMI. Then add an optional prepayment plan — a fixed extra amount every 12 months, a one-time lump sum in a specific month, or both — and the simulator runs a full month-by-month amortization for both scenarios, comparing the payoff time and total interest side by side.

The "reduce tenure" model

Your EMI is fixed at the original amount throughout. Each month, that EMI first covers the interest due on your outstanding balance, with the remainder going to principal — and any extra payment you've scheduled is added straight on top of that month's principal reduction. Because your balance falls faster, later months need less of the EMI for interest, so the loan finishes early instead of your monthly payment shrinking.

Assumptions and limitations

• Assumes a fixed interest rate for the full simulated period — real floating-rate loans can change their rate, which would change the numbers shown here.
• Doesn't model prepayment penalties, which some lenders (rare for floating-rate retail loans in India, more common for fixed-rate or business loans) may charge.
• The one-time lump sum is modeled as a single month; to model several one-time payments, run the simulator once per payment using the updated outstanding balance as your new "loan amount."

Privacy by design

All calculations happen entirely in your browser. Your loan details are never uploaded or stored anywhere.