Prepaying a home loan: should you reduce the EMI or the tenure?

A home loan is front-loaded with interest. In the first year of a 20-year loan at 8.5%, about 70% of each EMI is interest. That is why a prepayment made early is worth so much more than the same amount paid in year fifteen, and why the choice between reducing the EMI and reducing the tenure matters more than most borrowers realise.

How prepayment works

When you pay a lump sum over and above your EMI, the bank reduces the outstanding principal immediately. From the next month, interest is charged on the smaller balance. The bank then has to do one of two things to keep the loan on schedule:

• Keep the EMI the same and shorten the tenure. You pay the same each month but finish years earlier. This is the default at most Indian banks.
• Keep the tenure the same and reduce the EMI. Your monthly outgo drops, the end date stays put.

Both options save interest compared with not prepaying. But the first saves dramatically more, because every month you keep paying the original EMI you are effectively prepaying again.

A worked comparison

₹40 lakh outstanding at 8.5% with 18 years left. EMI is ₹36,218. Interest still to be paid without prepayment: ₹38.2 lakh. You prepay ₹5 lakh today.

Option	Monthly EMI	Remaining tenure	Interest still payable	Saving
No prepayment	₹36,218	216 months	₹38.2 lakh	–
Reduce tenure	₹36,218	164 months	₹24.2 lakh	₹14.0 lakh
Reduce EMI	₹31,690	216 months	₹33.4 lakh	₹4.8 lakh

Reducing tenure saves almost three times as much as reducing EMI, and clears the loan four years and four months early. Choose the EMI cut only if your monthly cash flow is genuinely tight.

Small, regular extra payments

You do not need a lump sum. Adding ₹5,000 a month to the EMI on the same loan shortens it by 51 months, about four years and three months, and saves roughly ₹10.3 lakh. Many banks let you set a higher standing instruction than the EMI; the excess is applied to principal automatically. Alternatively, increase the EMI by 5–10% each year as your salary rises, which most borrowers do not notice.

When prepayment beats investing, and when it does not

Prepaying a loan at 8.5% is the same as earning 8.5% after tax, risk-free. Compare that with what the same money could earn elsewhere after tax:

• Fixed deposits at 7% are taxed at your slab, so a 30% taxpayer nets about 4.9%. Prepayment wins.
• Debt funds and most bonds land in the same range. Prepayment wins.
• Equity SIPs with an expected 11–12% long-term return beat the loan rate on paper, but with volatility and a 12.5% long-term capital gains tax. Over 10+ years, the expected gain is higher; over 3–5 years, it is a coin toss.

A balanced approach many planners suggest: keep six months of EMIs as an emergency fund, invest for goals more than ten years away, and direct windfalls such as bonuses to prepayment.

The tax angle

Under the old regime, home loan interest up to ₹2 lakh a year is deductible under Section 24(b) and principal counts under 80C. Prepaying reduces interest, so it also reduces the deduction. For a 30% taxpayer this cuts the effective benefit of prepayment to about 6% while the interest is within the ₹2 lakh limit. Under the new regime, which most salaried taxpayers now use, there is no deduction on a self-occupied house and prepayment is worth the full loan rate.

Charges and rules

RBI prohibits foreclosure and part-prepayment charges on floating-rate home loans to individuals, whatever the source of the money. Fixed-rate loans can carry a charge, typically 2–3% of the amount prepaid. Most banks require a minimum part-payment of one EMI and may limit the number of prepayments a year for operational reasons. Always collect a revised amortisation schedule after each prepayment and check that the principal, not a future EMI, was reduced.

Checklist before you prepay

1. Confirm the loan is floating rate, so there is no charge.
2. Keep your emergency fund intact.
3. Clear higher-cost debt first: credit cards at 36–42% and personal loans at 12–18% beat any home loan prepayment.
4. Ask the bank in writing to reduce tenure, not EMI.
5. Take the updated schedule and store it with your loan documents.

Model your own loan with the prepayment calculator, check the base EMI in the home loan EMI calculator, and compare the alternative with the SIP calculator.