The EMI formula is: EMI = [P × R × (1+R)^N] ÷ [(1+R)^N − 1], where P is the principal loan amount, R is the monthly interest rate (annual rate divided by 12, then divided by 100), and N is the total number of monthly payments.
To see how this plays out in practice: imagine a loan of ₹500,000 at an annual interest rate of 10% for 5 years (60 months). The monthly interest rate R = 10 ÷ 12 ÷ 100 = 0.00833. Plugging into the formula gives an EMI of roughly ₹10,624. Over 60 months, you pay ₹637,440 in total — meaning ₹137,440 in interest on a ₹500,000 loan. That's a real number worth knowing before you sign.
The underlying principle is called amortization. Because your outstanding balance is highest at the start, the interest portion of each EMI is also highest at the start. As you pay down the principal month by month, the interest portion shrinks and the principal portion grows — even though your payment amount never changes. A full amortization schedule shows this breakdown for every single payment, which is useful for understanding the impact of making an early prepayment.
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