India Finance Research Brief: EMI and loan prepayment: understand the monthly maths

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Educational explainer: EMI and loan prepayment: understand the monthly maths

An equated monthly instalment (EMI) is a fixed scheduled payment under the loan's stated rate and repayment schedule. For a standard monthly reducing-balance illustration, EMI is calculated from principal, monthly interest rate and number of monthly payments. Early instalments usually contain a larger interest component because interest is calculated on the outstanding balance; as principal is repaid, the balance and interest component fall. Actual lender schedules, fees and rate resets can differ.

Worked illustration. A ₹25 lakh loan over 15 years at a constant 9% nominal annual rate, with monthly payments and no fees, produces an estimated EMI of about ₹25,357. The first month's interest portion is about ₹18,750 (₹25 lakh × 9% ÷ 12), so roughly ₹6,607 of that payment reduces principal. These rounded numbers are only an arithmetic example—not a lender quote. A floating rate, payment date, charges or different schedule changes the result.

A prepayment is an extra principal payment, but its effect depends on how the lender applies it and whether the borrower chooses a lower EMI or shorter tenure. Compare total interest, remaining tenure, liquidity after payment, and the loan agreement's current terms. Do not use emergency cash simply to reduce a loan balance; money needed soon has a different purpose from long-term surplus. Check fees and applicable rules with the lender before acting.

Use the Findost EMI calculator to test principal, rate and tenure. Calculations are indicative and do not constitute borrowing or investment advice.

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Sources and scope

• Findost EMI calculator

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