Most Indians accept an EMI figure from their bank without questioning it. They sign the loan agreement, set up a standing instruction, and watch ₹25,000–₹50,000 leave their account every month for 20 years. But understanding how that number was calculated — and what variables you can change — could save you lakhs of rupees over the life of a loan.
The EMI Formula: How It Actually Works
Indian banks use the reducing balance method (also called the diminishing balance method) to calculate EMI. The formula is:
EMI = P × r × (1 + r)^n / [(1 + r)^n – 1]
Where:
- P = Principal loan amount
- r = Monthly interest rate = Annual rate ÷ 12 ÷ 100
- n = Total number of monthly instalments (years × 12)
Example: ₹50 Lakh Home Loan at 8.5% for 20 Years
- r = 8.5 / 12 / 100 = 0.007083
- n = 20 × 12 = 240
- EMI = 5,000,000 × 0.007083 × (1.007083)^240 / [(1.007083)^240 – 1]
- EMI = ₹43,391
You'll repay ₹1,04,13,857 total — ₹54,13,857 in interest alone — on a ₹50 lakh loan.
How the RBI Repo Rate Flows to Your Home Loan
When you see RBI cut the repo rate by 25 basis points (0.25%), it doesn't immediately reduce your EMI. Here's the chain:
- RBI sets the Repo Rate (currently 6.25% as of 2026) — the rate at which banks borrow from RBI.
- Banks add a spread to the repo rate to set their Repo-Linked Lending Rate (RLLR).
- Your home loan rate = RLLR + Credit Risk Premium (based on your CIBIL score).
Current Rate Comparison (June 2026)
| Bank | Home Loan Rate (750+ CIBIL) | Processing Fee |
|---|---|---|
| SBI | 8.50% – 9.15% | ₹10,000 |
| HDFC Bank | 8.65% – 9.30% | 0.5% (min ₹3,000) |
| ICICI Bank | 8.60% – 9.25% | ₹3,000 |
| Kotak Mahindra | 8.70% – 9.40% | ₹10,000 |
| Bank of Baroda | 8.40% – 9.10% | ₹8,500 |
Rates are indicative as of June 2026. Actual rates depend on LTV, credit profile, and property type.
If your loan is a floating rate loan (most are), a 0.25% repo rate cut will reduce your total interest by ₹1.8–₹3.5 lakh on a ₹50L, 20-year loan — but only if your bank passes it through, which they are legally required to do for RLLR-linked loans.
How Amortisation Works: The "Front-Loading" Problem
EMI is fixed, but how it splits between interest and principal changes dramatically over time.
On a ₹50L loan at 8.5% for 20 years, here's the breakdown:
| Year | Interest Paid | Principal Paid | Outstanding Balance |
|---|---|---|---|
| 1 | ₹4,19,374 | ₹1,01,318 | ₹48,98,682 |
| 5 | ₹3,95,000 | ₹1,25,692 | ₹44,82,000 |
| 10 | ₹3,49,000 | ₹1,71,692 | ₹37,24,000 |
| 15 | ₹2,76,000 | ₹2,44,692 | ₹25,98,000 |
| 20 | ₹78,000 | ₹3,42,692 | ₹0 |
In Year 1, 80% of your EMI goes to interest and only 20% reduces the actual loan. This is the front-loading effect of amortisation. By Year 20, this reverses.
What this means practically: If you prepay even ₹1 lakh in Year 3 of a 20-year loan, you knock off roughly 14–18 months from the end — because every rupee of prepayment goes entirely to principal, bypassing future interest.
Strategies to Reduce Total Interest Paid
1. Make One Extra EMI Per Year
Paying 13 EMIs in a year (one extra) on a ₹50L, 20-year loan reduces the tenure by 3.5 years and saves approximately ₹8.2 lakh in total interest.
2. Prepay Windfall Amounts (Bonus, Tax Refund)
Applying your annual bonus (say ₹1–2 lakh) as a partial prepayment in the first 5 years is the highest ROI use of that money — it eliminates years of future compound interest.
3. Choose a Shorter Tenure from the Start
A ₹50L loan at 8.5% for 15 years has a higher EMI (₹49,190) but saves ₹27.2 lakh in total interest versus a 20-year loan.
4. Refinance When Rates Drop by 0.5% or More
If your current rate is 9.5% and a competitor offers 8.75%, refinancing saves ₹5–6 lakh on a typical loan — minus a ~₹35,000 processing fee. The net saving is still significant.
Use the EMI Calculator to Model These Scenarios
Our EMI Calculator lets you model all of these scenarios:
- Enter different interest rates to compare bank offers
- Use the prepayment field to see how a lump-sum prepayment reduces tenure
- Switch between years and months to fine-tune your calculation
- Use the Compare Two Loan Plans feature to put two bank offers side by side
The most important thing you can do before taking a home loan is to understand your own amortisation schedule. Your bank will give you one on request — or you can generate it instantly in our EMI calculator.
