How is EMI Calculated in the Reducing Balance Method? A Step-by-Step Guide

The reducing balance method is the standard for home loans in India — and understanding exactly how it works, why it saves you money compared to flat-rate alternatives, and how to calculate it yourself gives you genuine insight into your loan's true cost structure. This knowledge also helps you make smarter decisions about prepayment timing and tenure selection.

This page covers:

• What the monthly balance reducing method is
• How the reducing balance method works with an example
• The EMI calculation formula explained
• How to calculate EMI in Excel step-by-step
• How to maximise loan savings with this method
• Reducing balance vs fixed interest comparison
• How the method affects your EMI breakdown over time

When you borrow money from a lender, you repay it through Equated Monthly Instalments (EMIs). Each EMI has two parts — one reduces the original loan amount (principal), and the other pays the interest charged by the lender. The way this interest is calculated can differ significantly.

In the flat-rate method, interest is calculated on the full principal amount for the entire loan period, meaning the interest portion in every EMI remains almost the same regardless of how much you have already repaid.

Under the monthly balance reducing method, interest is charged only on the outstanding principal after each EMI is paid. As the loan amount reduces every month, the interest component also reduces gradually. Home loans usually follow this method, while some vehicle loans may use the flat-rate system.

The reducing balance method is a way to calculate interest where the interest amount decreases over time. Instead of charging interest on the entire loan amount, it is applied only to the outstanding principal after each EMI payment.

Example: For a home loan where Rs. 10,00,000 is borrowed at a 10% annual interest rate for 5 years, the interest for the first month is charged on Rs. 10,00,000. In the second month, after repaying part of the principal, interest is charged on the remaining balance. This continues until the loan is fully repaid.

This method benefits borrowers as they pay lower total interest over time compared to a flat-rate method.

EMI = (P × R × (1+R)^N) / ((1+R)^N − 1)

Where:

• P = Loan principal (amount borrowed)
• R = Monthly interest rate (Annual interest rate ÷ 12)
• N = Loan tenure (in months)

Example calculation

1. Open Excel and enter values in separate cells:
   • A1: Loan Principal (Rs. 10,00,000)
   • A2: Annual Interest Rate (10%)
   • A3: Loan Tenure in Months (60)
2. Calculate the Monthly Interest Rate — in cell A4, enter =A2/12/100
3. Use the PMT function — in cell A5, enter =PMT(A4,A3,-A1)
4. Press enter and the EMI amount will be displayed

Using Excel allows you to adjust loan parameters and see real-time changes in EMI calculations.

Since interest is calculated on the remaining principal, lowering that balance early can lead to meaningful savings:

• Make part-prepayments whenever possible: Even a small additional payment reduces the outstanding principal, lowering the interest calculated in future EMIs.
• Opt for a shorter repayment tenure: Slightly higher EMI but faster principal repayment, significantly reducing total interest paid.
• Maintain a strong credit score: Improves your chances of securing a lower interest rate, resulting in noticeable savings.
• Consider a balance transfer: If another lender offers a lower rate, transferring your remaining balance may reduce overall interest outgo.

The reducing balance method results in lower interest costs over time, making it suitable for home loans specifically.

• EMI breakdown: In the initial months, a larger portion of the EMI goes towards interest, and a smaller portion reduces the principal. As the outstanding loan amount decreases, the interest component reduces, and more of your EMI goes towards repaying the principal.
• Interest burden: Under this method, interest is calculated only on the remaining principal, generally leading to lower total interest compared to a flat-rate method, even if the quoted rate appears similar.
• Faster principal repayment: Because the principal reduces with every EMI and interest is recalculated monthly, you gradually repay a higher share of the principal, clearing your loan more efficiently.

For home loans, the reducing balance method ensures affordability, especially when combined with significant loan amounts and competitive rates. Use a home loan EMI calculator to estimate repayments and choose the best loan plan based on your specific principal, rate, and tenure combination.

Bajaj Finance offers home loans from 7.25% p.a.* with amounts up to Rs. 15 Crore* and flexible repayment plans extending up to 32 years, with no foreclosure charges for individual borrowers on floating rate loans — allowing you to leverage prepayment strategies fully. Check eligibility today.

Understanding how EMIs are calculated under the monthly reducing balance method helps you make informed borrowing decisions and plan effective prepayment strategies. Since interest is charged only on the outstanding principal, you end up paying less overall interest while steadily reducing your loan amount over time.