What your EMI is actually paying for

The payment is constant; what it buys is not

Every EMI does two jobs: it pays the interest that accrued on the outstanding balance this month, and whatever is left over reduces the balance.

Interest is charged on what you still owe. At the start you owe everything, so the interest portion is at its largest and there is very little left to repay principal. As the balance falls, the interest shrinks and the principal share grows — slowly at first, then faster.

Take a ₹50 lakh loan at 9% for 20 years. The EMI is about ₹44,986.

You paid ₹44,986 and reduced the loan by ₹7,486. Nothing has gone wrong — this is the arithmetic working exactly as designed. Interest on ₹50 lakh for one month at 9% is ₹37,500, and the lender is entitled to it before anything else.

The shape of the whole thing

Run that forward and the numbers are worth sitting with.

Two things follow. You pay more in interest than you borrowed, which a 9% rate does not intuitively suggest. And you are 70% of the way through the term before you have repaid half the loan — the point at which most people assume they are comfortably past halfway is nowhere near it.

These figures are arithmetic, not an estimate. Any EMI schedule can be reproduced from the loan amount, the rate and the tenure, and every lender will provide the full amortisation table on request. Asking for it is worth doing.

Why <em>when</em> you prepay dominates

Here is the finding that should change behaviour.

A prepayment goes entirely against principal. Because interest is charged on the outstanding balance, removing ₹1 of principal saves you every future month's interest on that ₹1 — so the earlier it goes in, the more months of interest it kills.

Same loan, same ₹5 lakh prepayment, two different timings:

The identical rupees, twelve years apart, differ by a factor of six. This is the time value of money running against you rather than for you, and it is the strongest argument available for directing any windfall at a loan early in its life rather than late.

The corollary is equally useful: prepaying in the final years of a loan achieves very little, because by then most of the EMI is already principal. Somebody stretching to clear the last two years of a home loan is buying a small saving at a large cost in liquidity.

Reduce the tenure, not the EMI

After a prepayment, most lenders offer a choice: keep the EMI and shorten the tenure, or keep the tenure and lower the EMI.

They are not close. Shortening the tenure removes months of interest entirely. Lowering the EMI keeps every one of those months and simply pays less each time — which means the balance falls more slowly and total interest barely moves.

Lowering the EMI is the right choice only when monthly cashflow is genuinely tight and the relief is needed. As a default it quietly discards most of the benefit you just paid for.

The same logic applies at origination. A longer tenure gives a smaller, more comfortable EMI and a substantially larger total cost — the comfort is real and it is being bought, not given.

What a rate change actually does

On a floating-rate loan, when the benchmark moves, lenders usually adjust the tenure rather than the EMI. Your monthly payment looks unchanged and the loan quietly got longer or shorter.

That is convenient and it hides the impact. A rate rise on a long-dated loan can add years, and if the remaining tenure cannot absorb the increase, the EMI is raised instead — often as a surprise.

Two habits follow. Check the outstanding tenure after any rate change, not just the EMI. And when rates fall, consider keeping the EMI where it is so the tenure shortens, which is the same reduce-the-tenure logic applied to a rate move.

For floating-rate loans to individuals, the RBI has restricted prepayment and foreclosure charges — the exact position is worth verifying before assuming a penalty applies, because lenders do not always volunteer it.

Comparing loans properly

The advertised rate is not the cost of the loan.

• Processing fee, often a percentage of the amount, payable upfront.
• Legal, valuation and documentation charges on secured loans.
• Insurance bundled into the disbursal — sometimes optional in practice while presented as required.
• The benchmark and reset frequency on a floating loan, which determines how quickly rate changes reach you.
• Whether it is reducing balance or flat rate. A “flat” rate charges interest on the original amount for the whole tenure even as you repay it — so a flat rate is far more expensive than the same number quoted as reducing balance. This is the single most misleading comparison in consumer lending.

Ask for the total amount repayable over the full tenure, in rupees. It is one number, it includes everything, and it makes two offers genuinely comparable in a way that competing percentages do not.

Where a loan sits against investing

In the order of operations, clearing expensive debt sits above investing, because the saving is certain and an investment return is not.

The comparison is simply the loan's rate against what the money would otherwise earn, and it is genuinely close for a low-rate secured loan while being no contest at all for anything unsecured. A home loan at single digits is a different decision from a personal loan at high double digits, and treating “debt” as one category is how people get it wrong in both directions.

One qualifier that is not arithmetic: an outstanding loan is a fixed monthly obligation regardless of what happens to your income. Clearing it buys resilience as well as interest saved, and that is worth something the spreadsheet does not show.

Running your own numbers

Every figure in this article came from three inputs — amount, rate, tenure — and the standard EMI formula. Your own schedule is equally reproducible, and your lender must provide the amortisation table.

For the prepay-or-invest question, the honest comparison is the loan's rate against what the same money has actually done. FNOTrader's Mutual Funds app runs contribution schedules against real NAV history — around 34 million NAV rows — reporting XIRR and the worst drawdown along the way. The drawdown matters here: the loan's saving arrives with certainty, and the investment's does not.

Common questions

Continue reading

More in Loans & Credit · App: Mutual Funds · Definitions: glossary · Free tools: calculators · All: every article