In India, a home loan is repaid through an EMI, the Equated Monthly Instalment. It is a fixed monthly amount that covers both interest and principal, and understanding how it is built makes prepayment decisions much clearer.
Reducing-balance interest
Indian home loans charge interest on the reducing balance: each month, interest applies only to the principal still outstanding, not the original amount. Your EMI stays fixed, but early instalments are mostly interest and later ones mostly principal, the same shift you see in any amortized loan. The formula is EMI = P·r·(1+r)n / ((1+r)n − 1), with r the monthly rate and n the number of months.
Floating rates
Most Indian home-loan rates are floating, linked to the RBI repo rate through an external benchmark. When the repo rate moves, your lender usually adjusts the tenure while keeping the EMI steady, or adjusts the EMI. Ask which approach your bank uses, because it changes how a rate cut helps you.
Why prepayment is so powerful
Floating-rate home loans to individuals carry no prepayment penalty. Because interest is charged on the reducing balance, every rupee you prepay removes interest from every remaining month. A prepayment in the early years, when the balance and the interest share are highest, saves the most. Even one extra instalment a year can trim years off the tenure. Our EMI calculator lets you model it.
Tax context
Under the old tax regime, home loans can bring deductions: interest under Section 24(b), principal repayment under Section 80C, and additional interest for eligible first-time buyers under Section 80EEA. Limits and eligibility change from year to year, and the new regime treats them differently. Treat this as background, not advice, and confirm current rules with a qualified tax professional.