A ₹50 lakh home loan at 8.5% over 20 years has an EMI of ~₹43,400 — and you will pay roughly ₹54 lakh in interest over the full tenure. Prepayment cuts that number dramatically, but only if your alternative is worse.
The math of a ₹5L lump-sum prepayment
On the same loan, prepaying ₹5 lakh at the end of year 2 reduces total interest paid from ₹54L to ~₹40L — a saving of roughly ₹14 lakh — and shortens tenure by about 4.5 years. The earlier you prepay, the more interest you compound away.
The actual decision rule
Prepay only when your loan's effective rate exceeds the after-tax return on your best alternative investment. For a home loan at 8.5% claiming the ₹2L Section 24(b) deduction under the old regime, the effective post-tax rate is roughly 6.4%. Comparing this to a 12% equity SIP (post-LTCG: ~10.5%) usually argues against prepayment — invest the surplus instead. Without the 24(b) deduction under the new regime, the 8.5% effective rate often beats safe alternatives.
How banks treat it
RBI mandates zero prepayment penalty on floating-rate home loans for individual borrowers. Fixed-rate loans typically attract a 2-4% charge. Lenders default to keeping your EMI the same and reducing tenure — ask explicitly if you want EMI reduction instead.
Try a scenario in our Home Loan EMI calculator — it has a built-in prepayment what-if slider.