EMI

EMI stands for Equated Monthly Instalment. It is the fixed amount you pay a lender every month until a loan is fully repaid, covering both the principal (the money you borrowed) and the interest (the cost of borrowing). "Equated" simply means the payment is the same from month to month for a fixed-rate loan.

How an EMI works

For a fixed-rate loan, the EMI stays constant across the tenure, but its composition shifts over time:

• Early months: most of each payment goes toward interest, with only a small slice chipping away at principal.
• Later months: the split flips, and most of the payment now reduces principal, because the outstanding balance — and therefore the interest charged on it — has fallen.

This is why the same monthly amount pays off the balance faster toward the end of the loan, and why prepaying in the early years saves so much total interest: you shrink the principal while it would still be generating the largest interest charges.

What determines your EMI

Four inputs drive the figure:

• Loan amount — larger loans, larger EMIs.
• Interest rate — higher rates raise the monthly cost.
• Tenure — a longer tenure lowers the EMI but increases total interest paid; a shorter tenure raises the EMI but cuts total interest.
• Compounding frequency / rate type — many loans use monthly reducing balances rather than simple annual interest.

The standard formula

For the common monthly reducing balance loan, the EMI is:

EMI = P × r × (1 + r)^n ÷ ((1 + r)^n − 1)

where P is the principal, r is the monthly interest rate (annual rate ÷ 12 ÷ 100), and n is the number of monthly payments. It is a fixed-payment annuity formula, which is exactly why the monthly amount stays constant even as the principal-versus-interest split changes.

Why longer tenure costs more

A longer tenure lowers your monthly burden but increases the total interest you pay, because you carry the balance for more months. The trade-off between a comfortable EMI and total interest cost is the central decision in any large loan.

A quick worked example

Take a ₹10,00,000 loan at 9% per annum for 5 years (60 months). The monthly EMI works out to roughly ₹20,758. Over the tenure you repay about ₹12,45,500 in total — meaning roughly ₹2,45,500 is pure interest, nearly a quarter of the original borrowed amount. Prepaying even a portion early in that schedule results in meaningful savings.

Run your own figures for any home, car, auto or personal loan with the Loan EMI Calculator.