Loan Prepayment Calculator

Why prepayment saves so much

Every loan EMI splits into two parts: interest on the outstanding balance and repayment of principal. In the early years the balance is large, so interest eats up most of each EMI. A prepayment goes entirely against principal, permanently shrinking the base on which all future interest is charged. That is why even a modest lump sum, paid early, can wipe out lakhs in interest.

Tenure reduction vs EMI reduction

After a part-payment, lenders let you choose one of two outcomes:

• Reduce the tenure — keep the EMI the same and finish the loan sooner. This saves the most interest because you owe money for a shorter time.
• Reduce the EMI — keep the tenure the same and lower your monthly outgo. This eases cash flow but saves far less interest.

For maximum savings, always pick tenure reduction if your budget can sustain the existing EMI. This calculator assumes tenure reduction and reports both the interest saved and the months shaved off.

Timing matters

The benefit of prepayment falls sharply as the loan ages. In year one, the balance and interest component are at their peak, so a ₹5 lakh prepayment on a ₹30 lakh loan removes years of compounding interest. The same prepayment in year 15 saves comparatively little, because by then most of each EMI is already principal. The rule: prepay early, prepay often.

Prepay or invest?

Prepaying gives a guaranteed, risk-free return equal to your loan rate. Compare that against what you could earn elsewhere:

• If your loan costs 9% and safe debt options yield 6-7% after tax, prepaying clearly wins.
• If you are comfortable with equity risk and a long horizon where returns may reach 11-12%, investing could build more wealth.
• Also weigh liquidity and tax benefits — home-loan interest and principal enjoy deductions that prepayment forgoes.

Keep an emergency fund intact first, then use this calculator to quantify exactly how much a prepayment saves before you commit the cash.