Home loan EMI uses the reducing-balance formula — interest is charged only on the outstanding principal:
EMI = P × r × (1 + r)n ÷ ((1 + r)n − 1)
- P — loan principal
- r — monthly interest rate (annual rate ÷ 12 ÷ 100)
- n — number of monthly instalments (years × 12)
Most home loans in India carry floating rates. When rates change, lenders usually keep your EMI fixed and stretch or shrink the tenure instead — so re-check your numbers after every rate revision.