How Equated Monthly Installments (EMI) Are Computed
An Equated Monthly Installment (EMI) represents the fixed monthly payment made by a borrower to a bank or financial institution on a predetermined calendar day. Each payment is bifurcated into two components: principal repayment and interest on the outstanding reducing balance.
The Standard Reducing Balance EMI Formula
Indian commercial banks calculate amortizing monthly payments using the mathematical formulation:
EMI = [ P × r × (1 + r)^n ] ÷ [ (1 + r)^n - 1 ]
Where:
- P = Principal loan amount sanctioned
- r = Monthly rate of interest (Annual interest rate ÷ 12 ÷ 100)
- n = Loan duration measured in calendar months (Tenure in years × 12)
Prepayment Strategy: How to Slash Your Interest Burden
Because Indian home loans follow the reducing balance method, interest accounts for the overwhelming majority of your initial EMI payments. Making an extra payment equivalent to just one additional EMI per year or increasing your monthly payment by 5% annually can curtail a 20-year home loan by approximately 4 to 6 years and save tens of lakhs in compound interest charges.