A spare ₹20,000 a month can kill a loan early or compound in a mutual fund, and the right answer is not a matter of temperament. It is a comparison between the interest rate you are paying and the return you would actually keep after tax. Both numbers are knowable. This runs the comparison over your own loan rather than a generic one.
Principal left, not the original amount.
Nominal, before tax.
Long-term equity gains are taxed at 12.5% above the annual exemption.
This calculator needs JavaScript. The short version: if the loan rate is higher than your expected post-tax return, prepaying wins, and it wins with certainty rather than on average.
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Prepayment is applied monthly and reduces tenure, not EMI — which is where nearly all the saving comes from. The comparison runs over the original remaining tenure so both paths cover the same period: after the loan closes early, the freed EMI is invested for the months that remain. Investment returns are treated as a smooth rate and taxed once at the end on the gain. No home loan interest deduction is modelled; if you are on the old tax regime with a self-occupied property, prepaying is worth slightly less than shown. Prepayment charges, which floating-rate retail loans in India generally do not carry, are excluded.
Prepaying a loan earns you a guaranteed return equal to its interest rate. Investing earns you an uncertain return, taxed on exit. So the question is whether your expected post-tax return exceeds the loan rate by enough to justify the uncertainty. A personal loan at 16% against an expected 9.6% post-tax equity return is not a close call. A home loan at 8.5% against the same 9.6% genuinely is.
Tax does more work here than most comparisons admit. Long-term capital gains on equity are taxed at 12.5% above the annual exemption, which turns an 11% nominal return into roughly 9.6% kept. Debt funds and most other gains taxed at your slab rate can turn 11% into 7.7%, which flips a lot of home-loan cases towards prepaying.
An EMI is front-loaded with interest. In the first years of a 20-year loan, the large majority of each payment services interest rather than reducing principal, so a rupee of prepayment in year two removes far more total interest than the same rupee in year fifteen. The saving is not linear in time, and it is why “I will prepay once I am earning more” costs more than it appears to.
The other lever is what the prepayment does to the loan. Reducing tenure captures nearly all the saving; reducing the EMI captures very little, because the interest keeps running for the full original term. Banks often default to reducing the EMI, because it feels better and costs you more. Ask explicitly.
When the two rates are close, the guaranteed one is worth more than expected value alone suggests. A prepayment removes an obligation permanently and immediately reduces the share of your income that is committed — the ratio the EMI-to-income calculator measures. That improves your position in a bad year in a way a portfolio balance does not, because the portfolio may be down in exactly the year you need it.
One thing to settle before either: high-interest debt first, always. A revolving credit card balance at 36–42% annualised makes this whole comparison academic. Clear that, then have this argument. The worked version of it is on the blog with the full arithmetic.
Compare the loan rate to your expected return after tax. A home loan at 8.5% against an equity portfolio returning 11% before 12.5% long-term capital gains tax leaves roughly 9.6% — a genuinely close call where certainty reasonably wins. Against a personal loan at 14–18%, prepaying wins clearly.
Tenure. Reducing tenure keeps the payment the same and closes the loan earlier, which captures nearly all the interest saving. Reducing the EMI keeps the loan running for its full original term and saves comparatively little. Lenders often default to reducing the EMI, so state which you want.
Floating-rate home loans to individual borrowers generally cannot carry foreclosure or prepayment penalties in India. Fixed-rate loans and some non-individual borrowings can. Check your own sanction letter before assuming either way, since the terms are specific to the loan.
Closing a loan early is not penalised in any meaningful way, and reducing your outstanding obligations generally helps. What matters far more to a credit score is payment history and credit utilisation, both of which prepaying either improves or leaves untouched.
It reduces the effective cost of the loan and therefore the benefit of prepaying, and it is deliberately not modelled here. Under the new tax regime, which most salaried taxpayers now default to, the interest deduction on a self-occupied property is unavailable — so whether it applies depends on your regime.
TLDR Money tracks your loans and your investments in the same place, so the prepay-or-invest question is answered against your real numbers rather than a fresh spreadsheet each time. No lending arm. No fund distribution. Subscription only.
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Calculator and assumptions last reviewed 5 August 2026.
This is an explanation of arithmetic, not advice about your money. TLDR Money is not a registered investment adviser and earns nothing from any product mentioned here. Figures are illustrative; your own numbers, taxes and circumstances will differ.