About to buy? Your home loan EMI calculator is only telling you half the story
Before you sign, every EMI calculator tells you one number: the EMI at today's rate, and the interest if that rate lasts for the whole loan. It will not last. A home loan runs for twenty years and the rate resets every few months. The honest question is not “what is my EMI today” but “what happens to my loan if the rate moves”.
The calculator below shows both: the typical answer on the left, and on the right what a rise in the rate would do to your EMI and your end date, plus what has actually happened to loans taken in earlier years.
The loan you are about to take
One rate, one answer
If the rate moves, here is what moves
If the rate rises: your two choices at each reset
When the rate on a floating loan changes, you are usually choosing between a longer loan and a higher EMI. RBI's circular on this (RBI/2023-24/55, updated October 2025) says lenders must give you the choice. These are the two outcomes for your loan if the rate rises by the amount in the first column and stays there.
| Rate rises by | Keep the EMI: loan gets longer by | Keep the end date: EMI rises by | Extra interest if you keep the EMI |
|---|---|---|---|
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Illustration: the rate rises on day one and stays there. In practice rises arrive at reset dates, and rates can also fall.
How much of a rise can the tenure absorb?
When the rate rises, many lenders keep your EMI the same and add months instead. That hides the rise until the loan reaches the 30-year limit. After that the EMI has to go up. For the loan above, with your EMI unchanged:
What if your income changes too?
The rate is one thing that can move after you sign. Your income is the other. Enter your monthly take-home income to see the EMI as a share of it, if the rate and your income both change. Lenders commonly size a loan so that the EMI is about 35 to 40% of income when it is sanctioned.
What actually happened to loans taken in earlier years
Same amount, same tenure and the spread you chose, but started in January of each year from 2020. The “typical calculator” column is what the buyer would have been told on the day. It cuts both ways.
| Started | Rate at start | Told on the day | What the rate path did |
|---|---|---|---|
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Modelled from published RBI repo decisions, an assumed spread of 2.65% over the repo rate (EBLR) and a constant EMI. Your lender's spread and reset rules decide the real outcome.
Get this loan updated on every RBI decision day
You are choosing a lender and a flat over weeks, and the rate will move in that time. Sign in free and we will email you after each RBI decision with what it does to a loan like the one above, using the amount and tenure you entered.
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Five things worth asking before you sign
- Which benchmark, and how often does it reset? A new floating-rate home loan from a bank should be repo-linked, and those reset at least every three months. MCLR loans, mostly older ones, usually reset every twelve.
- What is the spread, and can it change? The spread is the part your lender sets. Ask in writing whether it is fixed for the life of the loan.
- When the rate changes, do I choose between a higher EMI and a longer tenure? RBI says the lender should offer you the choice.
- What does it cost to switch benchmark or to move to a fixed rate? Ask about the fee. Since October 2025 offering a fixed-rate switch is at the lender's option.
- What are the part-prepayment rules? For a floating-rate loan taken by an individual, RBI rules bar prepayment charges. Confirm it for your loan.
The longer version is in what to know before you buy.
Buying a flat that is still being built? The lender pays the builder in stages and you pay interest only on what has been paid out, until the full EMI starts. That phase can run for years, and the rate can be re-set every quarter during it. Open the buyer check and choose Under construction to see the interest-only payments and the EMI at the end.
Questions
Is the EMI the only number I should compare between lenders?
No. Two lenders can quote the same EMI today and differ in spread, reset frequency and what they let you do at a reset. The EMI is the starting point; what the loan does when the rate moves is the larger part of the cost.
What happens to my home loan if the repo rate goes up?
At your next reset date the rate on your loan rises. If your EMI stays the same, the loan gets longer. If you ask for a higher EMI, the end date holds. RBI's circular says lenders must offer you the choice.
Can a home loan calculator predict future rates?
No, and neither can LoanRepo. It shows what a rise or fall of a given size would do to your loan, and what rate changes did to loans taken in earlier years. Future decisions are the RBI's.