Should You Prepay the Home Loan or Invest the Money?

Prepay the home loan or invest: how do the results differ?

Somebody with a home loan and money left over at the end of the month can use it to reduce the debt or invest it. Both are defensible. What makes the comparison difficult is that they produce different kinds of result.

A prepayment lowers the balance on which the lender charges interest. Interest that would have been charged on that part of the balance never arises, so the benefit is set by the loan's rate rather than by anything that happens in markets. Investing produces a result nobody knows in advance, and any gain is taxed when the investment is sold.

Because one result is fixed and the other is spread out, an average cannot settle the comparison. The useful questions are how often investing came out ahead, by how much, and what happened in the periods when it fell behind.

What does one prepayment save over the years?

The fixed result depends on conditions, and a single example makes them visible. Suppose ₹5.00 lakh is prepaid on a loan quoted at 9%, with interest charged monthly as in the EMI and amortisation article, and the instalment is left unchanged. If the loan is still running ten years later, its balance is lower by ₹12.26 lakh than it would otherwise have been. That is the prepaid amount grown at 9.38% a year, because a rate charged monthly compounds to slightly more than its quoted figure.

Three conditions sit behind that number. The rate stays fixed. The instalment stays the same, so the benefit remains inside the loan instead of being paid out as a smaller EMI. And the loan is still outstanding at the end of the period; once a loan has been repaid, the instalments it no longer needs become spare cash, and what that cash earns is a separate question. A rate reset, a lender recalculating the EMI, or a loan that finishes early all change the result. Money used to prepay is also no longer available as cash, which matters to a household that might need it back.

Keeping the instalment unchanged removes more interest in total than lowering it. Lowering it frees cash each month instead, and the value of that cash depends on how it is used, which this test does not model.

The comparison below uses a simpler convention: each rate on its ladder is an assumed effective annual rate, compounded once a year. Read that way, 9% grows the same prepayment to ₹11.84 lakh. A loan whose quoted rate is charged monthly therefore sits a little above the ladder row with the same headline number.

How was prepaying compared with investing?

The test takes ₹5.00 lakh on every trading day in the record from which a full ten years follows. The first period starts in June 1999 and the last ends in August 2026. One use of the money reduces the debt and grows at the borrowing rate. The other buys the Nifty 50 total return index, holds it for ten years and sells it. Both start with the same amount on the same day and end on the same day, so any difference comes from the choice rather than the setup.

This site holds no Indian home-loan rate series, so instead of choosing a representative rate the experiment runs at five rates and publishes all of them. The record does carry some context for that ladder. Over the 11 financial years since 2016-17, the benchmark scheduled banks set their lending against — currently the MCLR (Overnight) — has ranged from 6.7% to 8.3%. That is not a home-loan rate: a household's rate sits above its lender's benchmark by a margin that depends on the lender and the borrower, and no series for that margin exists here. The range is taken within the benchmark's current definition, because a range spanning its earlier definitions would partly measure the redefinition.

Did investing or prepaying come out ahead?

Across 4,282 ten-year periods, investing came out ahead most of the time at every rate tested. At 9%, the middle of the ladder, it was ahead in 87.7% of periods, and the median difference was 100% of the original amount — roughly the amount over again.

The last column shows the other side. At the same rate, the worst ten-year period left the investor 76.75% of the original amount behind where prepaying would have put them. That is the outcome of a full decade held to the end, set against a use of money whose result, under the conditions above, did not vary at all.

The rate convention matters here. If the same headline rate is charged monthly, its effective cost is 9.38%. At that rate investing was ahead in 84.5% of periods, and the worst period left the investor 85.15% of the amount behind.

How do the amount and tax change the answer?

The tax does not scale with the amount. Long-term gains are taxed at 12.5% only above an annual exemption of ₹1.25 lakh, and the main table assumes that exemption is unused and applies to this one sale. A small investment keeps much of its gain inside the exemption, while a large one barely notices it. How often investing came out ahead therefore depends on the amount, and on whether the exemption has already been used on other gains that year.

At the middle rate, with the exemption already used, investing was ahead in 86.5% of periods, and the worst period left the investor 79.88% of the amount behind.

How widely did the investment results vary?

The spread the index produced under this tax treatment is worth seeing on its own. Over the same ten-year periods, the annualised return after tax ranged from 4.8% to 20.9%, with the middle at 12.9%. One period in ten did worse than 8.7%.

One limitation must travel with those figures: in this record there is no ten-year period in which the investment lost money in nominal terms. That is mostly a statement about the sample. The series covers a single stretch of a single market that includes a long expansion, and the absence of a losing period here is not evidence that one cannot happen. The article on what this record can and cannot tell you explains why a record this short should be read cautiously.

The periods also overlap heavily. Thousands of ten-year periods drawn from twenty-seven years of history are nowhere near thousands of independent observations, so the precision a large count suggests is not there.

What did the test assume?

These results put historical index prices through one set of present-day assumptions. They are not a record of what any borrower or investor actually experienced.

• Amount and period: ₹5.00 lakh, held for ten years, from every trading day on which a full period follows.
• Investment: the gross version of the Nifty 50 total return index, which reinvests dividends without deducting tax on them. No fund expense, tracking difference or brokerage is deducted.
• Tax on the investment: the capital-gains rules for assessment year 2026-27, applied to every period, including periods that ended long before that year. Gains above an unused ₹1.25 lakh exemption are taxed at 12.5%. Surcharge, cess, the section 87A rebate, grandfathering of older gains and set-off of losses across years are not modelled.
• The loan: an assumed fixed effective annual rate from the ladder, compounded once a year, on a loan that is still outstanding at the end of the period with its instalment unchanged. Rate resets, prepayment charges and tax relief on the loan are not modelled.

What changes the answer for a particular household?

The tables show how often investing came out ahead under those assumptions. Several things outside them change what the result means for a particular household.

How much depends on the money. The prepayment has one outcome under the stated conditions; the investment has a spread. If an outcome like the worst periods in the table would force a change to something that matters, such as a goal that has to be met or a loan that must stay affordable, those periods carry more weight than the median does.

Access to the money. Money that has reduced a loan is no longer available as cash unless the lender offers a way to draw it back, which this test does not assume. A household without a cash reserve or adequate insurance has a short-term question that neither use of the money answers.

The cost of the debt. Tax relief on home-loan interest or principal, where it applies, lowers the effective cost of the debt and moves the comparison towards investing. This page states no such provision, because those are statutory particulars that change and nothing in this repository sources them; the ladder row that matters is the one nearest the loan's effective cost after any relief. A floating rate can move a loan between rows during the period, and a debt costing more than the top rung is outside what the table describes. The separate article on paying off credit card debt deals with a very different kind of borrowing.

Holding on. The test keeps the investment for the full ten years. An investment sold in a bad year produces a different result from the one in the table, so the historical figures describe the investing arm only for money that stays invested.

Splitting the amount. Nothing requires all of the money to go one way. A split takes part of each outcome, although the fixed exemption means the invested part's result does not scale exactly with its size.

What to take away

A prepayment removes interest at the loan's own rate. On a fixed-rate loan with an unchanged instalment that is still outstanding at the end of the period, its result does not depend on markets, and a rate charged monthly compounds to a little more than its headline figure. Investing the same money came out ahead in most ten-year periods of this record, often by a wide margin, and in its worst periods fell well behind.

Those results rest on one market's recent history, on present-day tax rules applied to old prices, and on an amount and exemption that change the answer. They describe what happened under stated assumptions rather than forecasting what will happen, and how much weight the worst periods deserve against the typical one is the part no table can settle.