EMI stands for Equated Monthly Instalment - the fixed amount you pay every month to repay a loan, combining both principal and interest, until the loan is fully cleared. Whether it's a home loan, car loan or personal loan, almost every loan in India is repaid through EMIs.
This guide walks through exactly how EMI is calculated, why the same "9%" quoted rate can mean very different things depending on how it's structured, and why the composition of your EMI - how much goes to interest versus principal - changes every single month.
Every bank and NBFC in India uses the same underlying formula, based on the reducing balance method - interest is charged only on the principal that's still outstanding, not on the original loan amount:
For a ₹10,00,000 loan at 9% per annum over 5 years: P = ₹10,00,000, R = 9 ÷ 12 ÷ 100 = 0.0075, N = 60. Plugging these in gives an EMI of ₹20,758. Over 5 years, you'd pay a total of ₹12,45,501 - meaning ₹2,45,501 goes toward interest.
Only three numbers decide your EMI: the principal, the interest rate, and the tenure. Increase any one of them and your EMI moves - but not always in the direction people expect. Here's how tenure alone changes the EMI for the same ₹10 lakh loan at 9%:
| Tenure | Monthly EMI | Total Interest | Total Payment |
|---|---|---|---|
| 3 Years | ₹31,800 | ₹1,44,790 | ₹11,44,790 |
| 5 Years ✦ | ₹20,758 | ₹2,45,501 | ₹12,45,501 |
| 7 Years | ₹16,089 | ₹3,51,483 | ₹13,51,483 |
| 10 Years | ₹12,668 | ₹5,20,109 | ₹15,20,109 |
| 15 Years | ₹10,143 | ₹8,25,680 | ₹18,25,680 |
| 20 Years | ₹8,997 | ₹11,59,342 | ₹21,59,342 |
Key insight: stretching the same ₹10 lakh loan from 5 to 20 years drops your EMI by more than half - but total interest rises from ₹2.45 lakh to ₹11.59 lakh. A lower EMI always comes at the cost of paying more, for longer.
Even though the EMI amount itself stays fixed, what it's made of shifts dramatically over the loan's life. In the reducing balance method, interest is calculated on whatever principal is still outstanding - so early on, when the balance is high, most of your EMI goes toward interest. As the balance shrinks, more of each EMI goes toward principal.
On the same ₹10,00,000 loan at 9% for 5 years (EMI ₹20,758):
| Month | Interest Portion | Principal Portion |
|---|---|---|
| Month 1 | ₹7,500 | ₹13,258 |
| Month 60 (last) | ₹155 | ₹20,604 |
In month 1, over a third of your EMI (₹7,500 of ₹20,758) is pure interest. By the final month, interest is almost nothing and nearly the entire EMI reduces principal. This is exactly why prepaying early in a loan's life saves far more interest than prepaying the same amount later.
Some lenders, especially for personal loans, gold loans or informal lending, quote a flat rate instead of reducing balance. In a flat-rate loan, interest is calculated on the full original principal for the entire tenure - even though you've already repaid part of it. This makes a flat rate sound deceptively low.
A flat rate of 9% behaves like a reducing-balance rate of roughly 16-17% - nearly double. This is why comparing loans purely on the quoted interest rate is risky. Always confirm whether the rate is flat or reducing balance, and ask the lender to state the effective annual rate (APR) for a true comparison.
Your interest rate - and therefore your EMI - stays the same for the entire tenure, regardless of what happens to market rates. Common for personal loans, car loans and some home loan products. Predictable, but you don't benefit if rates fall.
Your rate moves with a benchmark (like the RBI repo rate or a bank's MCLR). Most Indian home loans are floating rate. Your EMI or tenure adjusts when the benchmark changes - you save when rates fall, but pay more if they rise.
There's one more variation worth knowing, especially for car and consumer loans: EMI in Arrears (the standard structure) means your first payment is due one full month after disbursement. EMI in Advance means the first EMI is collected on the day the loan is disbursed - effectively reducing your outstanding principal from day one, which results in a slightly lower total interest outgo over the loan's life. You can toggle between both on the EMIPlan calculator to see the difference for your own loan.
Use EMIPlan's free calculator to work out the EMI, amortization schedule and prepayment savings for any home, car or personal loan.
Try the EMI Calculator →EMI stands for Equated Monthly Instalment - a fixed monthly payment that combines both principal repayment and interest, used to repay a loan over an agreed tenure.
For a fixed-rate loan, no - the EMI stays constant for the entire tenure, only its interest-to-principal composition shifts each month. For a floating-rate loan, the EMI (or the remaining tenure) can change whenever the lender's benchmark rate changes.
In a flat-rate loan, interest keeps being charged on the full original principal even after you've repaid part of it. In reducing balance, interest is charged only on what's actually still outstanding. At the same quoted 9%, this makes flat rate roughly equivalent to a 16-17% reducing-balance loan - nearly double the real cost.
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