A software engineer in Bellandur was thrilled to be offered a home loan at what sounded like a modest 8 percent, and he almost signed for a 30 year tenure because the monthly figure looked comfortable. Then he ran the full number. Over those 30 years, on a 50 lakh loan, he would repay more than 1.3 crore, of which over 82 lakh was pure interest. The same loan over 20 years would cost him about 50 lakh in interest instead. The rate had not changed. The tenure had, and the tenure was quietly the more expensive decision.

The short answer. On a 50 lakh home loan at 8 percent, the EMI is roughly 41,800 rupees over 20 years, and across those 20 years you repay about 50 lakh in interest, almost as much as you borrowed. Stretch the tenure to 30 years and the EMI falls to about 36,700 but the interest balloons past 82 lakh. Today the RBI repo rate is 5.25 percent and most floating home loans are repo linked, sitting in the high sevens to the mid eights. The trade off to internalise is that a longer tenure lowers your monthly pain but sharply raises the lifetime cost.

How is an EMI actually calculated?

An EMI is a level monthly payment that covers both interest and a slice of principal, calculated so the loan ends exactly at the last instalment. It depends on three things only, the loan amount, the monthly interest rate and the number of months. Early in the loan most of each EMI is interest and only a little is principal, and that mix flips slowly over the years until the final instalments are almost all principal. This is why paying a loan off early saves so much, since you are cutting the interest heavy years.

The practical point for a buyer is that you do not need the formula in your head, but you do need to run the full schedule, not just the monthly figure. A comfortable EMI can still hide a lifetime interest bill larger than the house, and only the total repayment reveals that.

This front loading of interest is also why prepayment is so powerful in the early years and far weaker later. A lump sum paid in year two of a 20 year loan removes principal that would otherwise have attracted interest for 18 more years, so a modest prepayment early can knock out a disproportionate amount of total interest. The same amount paid in year 18 saves almost nothing, because by then the remaining interest is small. For a Bengaluru buyer whose income rises over time, a habit of prepaying in the early years, when it hurts the most and helps the most, is one of the cleanest ways to cut the lifetime cost of a loan without ever touching the interest rate.

What does tenure do to the total cost?

Tenure is the lever most buyers underestimate, because it moves the monthly EMI a little and the lifetime interest a lot. On a 50 lakh loan at 8 percent, shortening the tenure from 30 years to 15 years raises the EMI from about 36,700 to about 47,800, an increase most earners can partly absorb, while cutting the total interest from over 82 lakh to about 36 lakh. That is a saving of more than 45 lakh in interest for a monthly increase of around 11,000.

Seen that way, a long tenure is not free flexibility, it is deferred and multiplied cost. The table below shows the same 50 lakh loan at 8 percent across four tenures, so the pattern is visible at a glance.

The monthly figures barely move between 20 and 30 years, but the interest column tells the real story. Choosing the shortest tenure you can comfortably service is the single most powerful lever an ordinary borrower controls, and it is a lever entirely in your hands, unlike the interest rate, which the market sets for you.

How does the repo rate connect to your EMI?

The repo rate is the rate at which the RBI lends to banks, and it sits underneath most modern home loans. Today that repo rate is 5.25 percent, after a series of cuts through 2025, and most new floating rate home loans are linked to it through an external benchmark. When the repo rate moves, a repo linked loan is designed to pass the change through to the borrower relatively quickly, which cuts both ways, helping when rates fall and hurting when they rise.

For a buyer this means your quoted rate of, say, 8 percent is really the repo rate plus a spread the bank adds for its costs and your credit profile. A stronger credit score narrows that spread, which is why the best rates in the market go to borrowers with high scores. Understanding fixed versus floating is central here, and our guide on fixed versus floating home loan rates covers that choice in depth.

What happens when your floating rate changes?

When a repo linked rate changes, banks usually keep your EMI the same and adjust the tenure instead, unless you ask otherwise. If your rate rises, the tenure quietly lengthens so the monthly figure does not jump, which feels painless but means you pay for longer. If your rate falls, the tenure shortens. Many borrowers never notice this happening in the background, and they end up on a much longer schedule than they planned, sometimes discovering years later that their loan will run well past the tenure they originally signed for.

The buyer friendly habit is to check, after any rate change, whether your tenure has stretched, and to ask the bank to hold the tenure and raise the EMI instead if you can afford it. Keeping the tenure fixed protects you from the silent extension that turns a 20 year loan into something much longer. If your rate has drifted above the market, our guide on the home loan balance transfer shows how to move to a cheaper lender.

How should a Bengaluru buyer use these numbers?

Use them to size the loan against your life, not just against the monthly EMI. Before committing, run the full repayment for the tenure you are considering, look at the total interest and not only the instalment, and ask whether a slightly higher EMI on a shorter tenure is within reach, because it usually saves a fortune. A loan for a home like My Home Hoskote is a multi decade commitment, and the tenure you pick today shapes how much of your future income the house consumes.

A useful discipline is to keep the EMI within a share of your take home income that still leaves room to live. A common rule of thumb is to keep total monthly loan obligations under about 40 percent of take home pay, and lenders themselves apply a similar ceiling when they size your eligibility. But the ceiling the bank will lend you is not the same as the amount you should borrow. Borrowing the maximum stretches your budget to its edge and leaves nothing for the repairs, the school fees and the emergencies that a long ownership horizon guarantees will arrive. The comfortable number is almost always below the sanctioned number, and the gap between them is your safety margin.

It also pays to remember that the EMI is not the whole cost of owning. On top of it sit maintenance charges, property tax, insurance and the occasional major repair, none of which the loan covers. A buyer who plans only to the edge of the EMI is planning for a house with no running costs, which does not exist. Building those recurring costs into your monthly picture, alongside the EMI, is what separates a loan you can carry comfortably for two decades from one that feels heavier every year.

Your seven step home loan cost checklist

1. Run the full EMI and total repayment, not just the monthly figure, before you commit.
2. Compare the total interest across 15, 20 and 30 year tenures for the same loan.
3. Choose the shortest tenure whose EMI you can comfortably service.
4. Confirm whether your loan is fixed or floating, and if floating, that it is repo linked.
5. Understand your rate as the repo rate plus a spread tied to your credit score.
6. After any rate change, check whether your tenure has silently lengthened.
7. Keep a buffer, since your EMI should leave room for other goals and emergencies.

Frequently asked questions

What is the EMI on a 50 lakh home loan at 8 percent? On a 50 lakh loan at 8 percent, the EMI is roughly 41,800 rupees over 20 years and about 36,700 rupees over 30 years. The longer tenure lowers the monthly figure but raises total interest sharply, from about 50 lakh over 20 years to more than 82 lakh over 30 years on the same loan.

Does a longer tenure really cost that much more? Yes. Tenure moves the EMI a little and the lifetime interest a lot. On a 50 lakh loan at 8 percent, cutting the tenure from 30 to 15 years raises the EMI by around 11,000 rupees but reduces total interest from over 82 lakh to about 36 lakh, saving more than 45 lakh across the loan.

How does the repo rate affect my home loan? The repo rate, currently 5.25 percent, is the rate the RBI lends to banks at, and most new floating home loans are linked to it. Your quoted rate is the repo rate plus a spread for the bank's costs and your credit profile, and repo changes pass through to a repo linked loan relatively quickly.

Why does my loan tenure keep changing? When a repo linked rate changes, banks usually keep the EMI steady and adjust the tenure instead. A rate rise silently lengthens your tenure so the monthly figure does not jump. After any rate change, check your tenure and, if you can afford it, ask the bank to hold the tenure and raise the EMI instead.

Last updated 2026-08-27. PropNewz Team.