An Equated Monthly Instalment (EMI) is the fixed amount you pay your lender every month until a loan is repaid. Each EMI contains two parts: interest on the outstanding balance and principal that reduces the balance.
The three numbers that decide your EMI
- Loan amount (P) — how much you borrow.
- Interest rate (r) — the annual rate, converted to a monthly rate for the calculation.
- Tenure (n) — the number of monthly instalments.
The standard formula is:
EMI = P × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1)
where r is the monthly interest rate (annual rate ÷ 12 ÷ 100).
For example, a ₹30 lakh loan at 9% a year for 20 years (240 months) works out to an EMI of roughly ₹26,992. Over the full tenure, you would pay about ₹34.8 lakh in interest — more than the loan itself.
You can try your own numbers in our loan EMI calculator.
Why early EMIs are mostly interest
Interest is charged on the outstanding balance. At the start, the balance is at its highest, so most of each EMI goes towards interest. As the balance falls, the interest portion shrinks and more of each EMI repays principal.
In the first few years of a long home loan, a large share of each EMI can be interest. This is why prepayments made early have the biggest effect.
Tenure: lower EMI vs lower total cost
A longer tenure reduces the monthly EMI but increases the total interest you pay. A shorter tenure does the opposite.
| Tenure | Approx. EMI (₹30 lakh at 9%) | Approx. total interest |
|---|---|---|
| 15 years | ₹30,428 | ₹24.8 lakh |
| 20 years | ₹26,992 | ₹34.8 lakh |
| 25 years | ₹25,176 | ₹45.5 lakh |
The right balance depends on how comfortably the EMI fits your monthly budget.
How prepayments help
A prepayment reduces your outstanding principal directly. After a prepayment, lenders usually let you either:
- keep the EMI the same and reduce the tenure (this generally saves more interest), or
- keep the tenure the same and reduce the EMI.
For floating-rate loans taken by individuals, lenders generally do not charge prepayment penalties, but check your loan agreement for the terms that apply to you.
Floating rates and your EMI
On a floating-rate loan, the interest rate moves with the lender's benchmark. When rates change, lenders typically adjust the tenure first and the EMI only if needed. It is worth checking your loan statement once a year to see how your remaining tenure has changed.
Key takeaways
- Your EMI depends on the loan amount, interest rate and tenure.
- Longer tenures mean smaller EMIs but much more interest overall.
- Early prepayments, even small ones, can noticeably reduce total interest.
If you are comparing loan offers, our team can help you understand the terms from different lenders.
