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Home Loan Prepayment: Should You Prepay or Invest?

Published October 8, 2026 · 6 min read · By Ramanathan · Paired with the Home Loan Prepayment Calculator

The short answer: prepay when your home loan costs more, after tax, than your spare money can reliably earn after tax. Invest when it does not. Prepaying a loan at 8.5% is a guaranteed, risk-free 8.5% return. A fixed deposit almost never beats that once it is taxed. Equity funds can, over long periods, but only with risk you have to be able to stomach. Run your own figures on the home loan prepayment calculator.

The rest of this guide shows why, using one home loan throughout: ₹20 lakh at 8.5% for 20 years, with an EMI of ₹17,356 and ₹21,65,552 of total interest if nothing is prepaid.

The rule: compare two after-tax rates

Every rupee you prepay stops interest at your loan rate for every month the loan would otherwise have run. So prepaying "earns" exactly the loan rate, with no market risk and no tax on the saving. The question is only whether the same rupee would earn more somewhere else, after tax.

Example 1: what one prepayment does

Suppose you prepay ₹2 lakh after the 36th EMI. Your lender will either keep the EMI and end the loan early, or keep the end date and cut the EMI. The choice matters more than most borrowers realise:

The same ₹2 lakh saves about three times as much when you keep the EMI. A lower EMI repays principal more slowly for the rest of the loan, so most of the benefit leaks away. Ask for the lower EMI only if you genuinely need the monthly room. Timing matters too: the same ₹2 lakh prepaid after the first year saves ₹6,41,476, and after the tenth only ₹2,28,553.

Example 2: prepay or invest the same ₹2 lakh

Now compare two households with the same loan and the same cash. One prepays ₹2 lakh after EMI 36 and, once the loan closes in year 17, invests the ₹17,356 a month it no longer owes. The other keeps the loan as it is and invests the ₹2 lakh instead. Both spend exactly the same money every month for 20 years. The figures are what each has invested at the end, before tax:

The break-even sits exactly at the loan rate. That is not a coincidence: when both paths spend the same cash, prepaying is simply an investment that earns the loan rate. Below it, prepaying wins; above it, investing wins, by a margin that grows with every extra point of return. The catch is that the 6% and 7% rows are what a deposit pays, while the 10% and 12% rows need equity markets to cooperate for seventeen years.

Example 3: tax moves the hurdle

Example 2 ignored tax. In real life, both sides of the comparison are taxed differently, and that can move the answer.

The loan side. Under the old tax regime, interest on a loan for a home you live in can be deducted under Section 24(b), up to ₹2 lakh a year. On our loan the first year's interest is ₹1,68,473, inside the limit, so in the 30% slab (31.2% with the 4% cess, ignoring surcharge) the real cost of the loan falls from 8.5% to about 5.85%. Under the new regime there is no such deduction for a self-occupied home, so the hurdle stays at 8.5%. On a bigger loan the cap bites: a ₹50 lakh loan at 8.5% runs up ₹4,21,182 of interest in its first year, and only ₹2 lakh of it is deductible, so its real cost sits much closer to 8.5%.

The investment side. A 7% fixed deposit taxed at 31.2% leaves about 4.8%. That loses to the loan in either regime, which is why prepaying almost always beats a deposit. An equity fund growing at 12% a year for 17 years and then sold, with long-term gains taxed at 12.5% above the ₹1.25 lakh yearly exemption, keeps about 11.4% a year after tax. That clears both hurdles comfortably on paper, which is the honest case for investing. It also assumes 12% arrives every year for 17 years.

Example 4: a lump sum or a habit?

Most people prepay from cash flow rather than a windfall. On the same loan, keeping the EMI and letting the loan end early:

Two things decide the saving: how much extra you put in, and how early. The single ₹2 lakh saves more than ₹1,500 a month despite being less money, because all of it goes in during year three. A yearly ₹1 lakh, perhaps from a bonus, halves the loan's life. Raising the EMI in step with your salary is the gentlest version and still takes almost eight years off.

When prepaying is the wrong move

You have no emergency fund. Money paid into a loan is hard to get back. Keep several months of expenses somewhere you can reach first.

You carry costlier debt. A credit card at 36% or a personal loan at 14% should be cleared long before a home loan at 8.5%.

Your loan is fixed-rate with a charge. Floating-rate loans to individuals for non-business purposes cannot carry prepayment charges under the RBI (Pre-payment Charges on Loans) Directions, 2025, for loans sanctioned or renewed from 1 January 2026, and earlier RBI instructions already covered floating-rate home loans. A fixed-rate loan may carry a charge set out in your agreement; check your sanction letter and include it in the sums.

A big goal is close. If you need the money for a child's education or a down payment in two or three years, keep it accessible rather than locking it into the house.

How to make the prepayment

Most lenders accept part payments through net banking or at the branch. When you pay, say in writing whether you want a shorter tenure or a lower EMI, because many lenders default to the shorter tenure. Ask for the revised repayment schedule afterwards and check it against your own figures. Keep the receipt: under the old regime, principal repaid on a home loan, including a prepayment, can count towards the ₹1.5 lakh Section 80C limit, although for many salaried people that limit is already used up.

Many borrowers end up doing both: prepaying a fixed slice each year for the certainty, and investing the rest for growth. The calculator's prepay-or-invest panel lets you test any split against your own expected return.

Run it for your own loan:
Prepayment Calculator SIP Calculator

Related guide: SIP vs FD, compared after tax

Figures assume a constant 8.5% rate and monthly compounding, and are rounded to the nearest rupee. Tax figures use the rules in force for FY 2026-27 and are illustrations, not tax advice. See the India home loan hub for more India-specific calculators and guides.