What an EMI is
An Equated Monthly Instalment is the fixed amount you pay a lender every month until a loan is cleared. It is "equated" because the rupee value never changes across the tenure, even though what it is composed of changes every single month.
Each EMI splits into two parts. One part covers the interest accrued on the outstanding balance that month. The rest reduces the principal. Because the principal shrinks with every payment, the interest portion falls and the principal portion grows — while the total stays flat.
This front-loading of interest is the most important thing to understand about a loan. On a ₹25,00,000 home loan at 8.75% over 20 years, the EMI is ₹22,093. In month one, ₹18,229 of that is interest and only ₹3,864 touches the principal. It takes until roughly year 13 before the split crosses over.
The EMI formula
Every lender uses the same reducing-balance formula:
- P
- Principal — the loan amount sanctioned
- r
- Monthly interest rate — annual rate ÷ 12 ÷ 100
- n
- Tenure in months — years × 12
Interest for any given month is simply the outstanding balance multiplied by
r. The principal repaid that month is EMI − interest. Subtract it
from the balance and repeat. That loop is the amortisation schedule shown above.
Reducing balance versus flat rate
Some lenders, particularly for personal and vehicle loans, quote a flat rate. Flat interest is charged on the original principal for the whole tenure, ignoring the fact that you have been repaying it. A 10% flat rate is roughly equivalent to an 18% reducing rate over five years — nearly double the real cost.
Always ask for the reducing-balance rate, or for the APR, before comparing offers. This calculator uses reducing balance, which is what home loans and regulated APR quotes use.
A worked example
Over 240 months you repay ₹53,02,320 in total — ₹28,02,320 of it interest, more than the loan itself.
What one extra EMI a year does
Paying an extra ₹22,093 once a year — effectively 13 EMIs instead of 12 — clears this loan in about 16 years 4 months rather than 20, and saves roughly ₹6,60,000 in interest. Enter ₹1,841 in the extra monthly payment field above to model it.
How much EMI will a lender allow?
Indian lenders size loans against your FOIR — Fixed Obligation to Income Ratio. It is the share of your net monthly income already committed to EMIs, and most banks cap the total at 50% to 55%, including the new loan.
| Net monthly income | Max EMI (50%) | Approximate loan |
|---|---|---|
| ₹50,000 | ₹25,000 | ₹28.3 lakh |
| ₹75,000 | ₹37,500 | ₹42.4 lakh |
| ₹1,00,000 | ₹50,000 | ₹56.6 lakh |
| ₹1,50,000 | ₹75,000 | ₹84.9 lakh |
| ₹2,00,000 | ₹1,00,000 | ₹1.13 crore |
Two other limits apply to home loans. The loan-to-value cap set by the RBI restricts borrowing to 90% of property value up to ₹30 lakh, 80% between ₹30 lakh and ₹75 lakh, and 75% above that — so you must fund the rest as down payment. And your credit score drives the rate offered; scores above 750 typically secure the best published rates, while scores below 700 attract a premium of 0.5 to 2 percentage points.
Three ways to cut the interest you pay
1. Prepay early, and prepay principal
On floating-rate home loans to individuals, the RBI prohibits prepayment penalties, so partial prepayments are free. When you make one, ask the bank to reduce the tenure rather than the EMI. Reducing the tenure keeps your payment the same and removes months of interest; reducing the EMI feels better monthly but saves far less.
2. Shorten the tenure at the outset
On the ₹25,00,000 example, moving from 20 years to 15 raises the EMI from ₹22,093 to ₹24,978 — about ₹2,885 more a month — but cuts total interest from ₹28.02 lakh to ₹19.96 lakh. That is ₹8 lakh saved for roughly ₹35,000 a year extra.
3. Refinance when rates fall
A balance transfer to a lender offering a lower rate can be worth it if you are in the first half of the tenure, where interest still dominates. Weigh the saving against the new lender's processing fee and legal charges, typically 0.5% of the outstanding amount.
| Rate | 10 years | 15 years | 20 years | 30 years |
|---|---|---|---|---|
| 8.0% | ₹1,213 | ₹956 | ₹836 | ₹734 |
| 8.5% | ₹1,240 | ₹985 | ₹868 | ₹769 |
| 9.0% | ₹1,267 | ₹1,014 | ₹900 | ₹805 |
| 9.5% | ₹1,294 | ₹1,044 | ₹932 | ₹841 |
| 10.0% | ₹1,322 | ₹1,075 | ₹965 | ₹878 |
| 12.0% | ₹1,435 | ₹1,200 | ₹1,101 | ₹1,029 |
Frequently asked questions
How is EMI calculated on a home loan?
Using the reducing-balance formula: EMI = P × r × (1+r)ⁿ ÷ [(1+r)ⁿ − 1], where P is the principal, r is the monthly interest rate (annual ÷ 12 ÷ 100) and n is the tenure in months.
Interest each month is charged only on the balance still outstanding, which is why the interest share of your EMI falls over time even though the EMI itself does not change.
Can I reduce my EMI after taking the loan?
Yes, in three ways. You can extend the tenure, which lowers the EMI but increases total interest. You can make a partial prepayment and ask for the EMI to be recalculated. Or you can transfer the balance to a lender offering a lower rate.
If your loan is floating-rate and market rates have fallen, ask your existing lender first — most will reset your rate for a small conversion fee, which is cheaper and faster than a full balance transfer.
Is there a penalty for prepaying a loan in India?
For floating-rate loans taken by individuals for non-business purposes, the RBI bars lenders from charging foreclosure or prepayment penalties. This covers most home loans.
Fixed-rate loans are different — penalties of 2% to 4% of the prepaid amount are common. Personal and car loans often carry prepayment charges and sometimes a lock-in of 6 to 12 months. Check your sanction letter before prepaying.
Should I reduce the tenure or the EMI when I prepay?
Reduce the tenure if you can afford to keep paying the same EMI. It saves substantially more interest, because you are removing months during which interest would have accrued.
On a ₹25 lakh loan at 8.75% for 20 years, a ₹2 lakh prepayment at the end of year three saves about ₹7.4 lakh if applied to tenure, against roughly ₹4.1 lakh if applied to the EMI.
What is the difference between EMI and a pre-EMI?
Pre-EMI applies to under-construction property, where the lender disburses money in stages. Until full disbursement you pay only the interest on the amount released so far — that is the pre-EMI. Your principal does not reduce at all during this period.
The full EMI begins once the loan is fully disbursed. Paying full EMIs from the start, if the lender allows it, saves considerable interest over the life of the loan.
Does a missed EMI affect my credit score?
Yes, significantly. Lenders report to credit bureaus monthly, and a payment more than 30 days late can drop a CIBIL score by 50 to 100 points. The record stays on your report for several years.
If you expect difficulty, contact your lender before the due date. Restructuring or a short moratorium is usually available and is far less damaging than a default.
Can I claim tax benefits on a home loan EMI?
Under the old tax regime, yes. Section 24(b) allows a deduction of up to ₹2,00,000 a year on interest paid for a self-occupied property, and Section 80C allows up to ₹1,50,000 on the principal repaid, within the overall 80C limit.
The new regime removes most of these deductions. Which is better depends on your total deductions — compare both with our income tax calculator.