The EMI Formula
EMI = P × r × (1+r)^n / ((1+r)^n - 1)
Where: P = Principal (loan amount), r = Monthly interest rate (annual rate ÷ 12 ÷ 100), n = Tenure in months.
You don't need to calculate this manually — banks provide EMI calculators. But understanding what changes the EMI helps you optimise.
How EMI Changes with Different Variables
**Effect of loan amount (at 9.25% for 15 years):**
**Effect of tenure (₹15 lakh loan at 9.25%):**
Longer tenure = lower EMI but significantly higher total interest.
**Effect of interest rate (₹15 lakh loan for 15 years):**
A 0.5% rate difference on a ₹15 lakh, 15-year loan is ₹54,000 in total extra cost.
Structuring Your Loan for Minimum Burden
**Rule 1:** EMI should not exceed 35–40% of your monthly take-home income. For ₹15,400 EMI, you need ₹38,000–44,000 take-home monthly income (or combined family income).
**Rule 2:** Maximise your down payment. Every rupee of down payment saves you approximately ₹2 in total interest over a 15-year loan. If you can increase down payment from 25% to 35%, do it.
**Rule 3:** Don't extend tenure just to lower EMI unless necessary. The interest cost of extending from 10 to 15 years (for the example above) is ₹5.2 lakhs extra. Is the ₹3,350/month EMI saving worth ₹5.2 lakhs? Usually not.
Prepayment: Your Best Financial Move
If your income increases or you receive a bonus, prepay the principal. Banks (as per RBI mandate) cannot charge prepayment penalties on floating-rate loans.
Prepaying ₹1 lakh on a ₹15 lakh, 9.25%, 15-year loan in year 3 saves approximately ₹1.8 lakhs in total interest and cuts the loan tenure by 18 months.
The EMI Calculator on This Website
Use our built-in EMI calculator on any property detail page to calculate your specific EMI before you enquire. Enter the property price, your down payment, expected loan rate, and tenure. The result helps you decide whether a property is within your budget before committing time to document verification.