Prepayment — put a lump sum toward the principal
Making a lump-sum payment toward your outstanding principal — a bonus, a maturing investment, or savings — reduces the principal your interest is calculated on for every remaining month, so it compounds in your favor for the rest of the loan.
On a ₹30,00,000 loan at 8.5% for 20 years (240 months), the EMI is about ₹26,035/month and total interest over the full term is about ₹32,48,328. Adding just ₹5,000 extra to every monthly payment cuts the tenure from 240 to 164 months (76 months, or over 6 years, shorter) and reduces total interest to about ₹20,75,271 — a saving of roughly ₹11,73,056 in interest, for ₹5,000/month more.
Most Indian lenders don't charge a prepayment penalty on floating-rate home loans (per RBI guidelines) — but confirm your specific loan's terms, since fixed-rate loans can still carry a charge.
Balance transfer — move to a lender with a lower rate
If your current lender's rate is no longer competitive, transferring the outstanding balance to a new lender at a lower rate reduces your interest cost for the remaining tenure, typically for a processing/transfer fee.
On a ₹30,00,000 outstanding balance with 180 months (15 years) remaining, moving from a 9.5% rate to an 8.0% rate — with a ₹15,000 transfer fee — reduces the EMI from about ₹31,327 to about ₹28,670, and cuts total remaining interest from about ₹26,38,813 to about ₹21,60,521, a net saving (after the fee) of roughly ₹4,63,292 over the remaining term.
Balance transfer is most worth it early in the loan, since more of your EMI goes toward interest in the earlier years — transferring late in the tenure (when most of the principal is already paid down) saves much less, since there's less remaining interest to reduce.
Extending the tenure — lowers the EMI, but costs more overall
If your goal is specifically a smaller EMI (e.g. to free up monthly cash flow, not to reduce total cost), asking your lender to extend the remaining tenure lowers the EMI — but it increases total interest paid, since you're paying interest for more months. This is the opposite lever from prepayment: use it only if monthly affordability, not total cost, is the actual constraint.
Which lever should you use?
If you have surplus cash and want to cut total cost, prepayment is usually the simplest, fee-free option (check your specific loan for any prepayment charge first). If your current rate is genuinely above market and you don't have surplus cash to prepay, balance transfer can unlock savings without needing extra money upfront, though it does involve a one-time fee and some paperwork. Only extend your tenure if lowering the monthly EMI itself — not the total cost — is the actual problem you're solving.