What Is Home Loan Prepayment?
Home loan prepayment is paying a lump sum toward the outstanding principal, on top of your regular EMI. The outstanding balance drops immediately, which means less interest accrues in every subsequent month. On a Rs 50 lakh loan at 8.5% for 20 years, the original EMI is Rs 43,391 and total interest is Rs 54.1 lakh. Prepaying Rs 5 lakh at month 12 reduces the principal to around Rs 44.4 lakh at that point, and cuts total interest to roughly Rs 45.9 lakh, a saving of Rs 8.2 lakh.
There are two types of prepayment. Part prepayment (also called partial prepayment) is paying a lump sum while the loan continues. Full prepayment closes the loan entirely. Both are penalty-free on floating-rate home loans under RBI's October 2019 guidelines. Fixed-rate loans typically carry a 2% charge on the prepaid amount.
The benefit of prepayment compounds in reverse: every rupee you pay early eliminates a stream of interest that would have been charged over years. This is why a Rs 5 lakh prepayment in year 1 saves more than twice as much as the same Rs 5 lakh in year 10.
How Prepayment Saves Interest: The Math
Home loan interest is calculated on the reducing balance. The EMI formula is:
EMI = P x r x (1+r)^n / ((1+r)^n - 1) where: P = loan principal r = monthly rate = annual rate / 12 / 100 n = tenure in months
Outstanding balance after M months of EMIs:
Balance(M) = P x (1+r)^M - EMI x ((1+r)^M - 1) / r
For a Rs 50 lakh loan at 8.5%, after 12 months the outstanding balance is approximately Rs 49.38 lakh. A Rs 5 lakh prepayment reduces it to Rs 44.38 lakh. Applying the EMI formula to solve for the new tenure at Rs 43,391 EMI gives about 192 months (down from 240), a saving of 48 months and Rs 8.2 lakh in interest.
In reduce-EMI mode, the remaining tenure stays at 228 months (240 minus 12 already paid), but the EMI recalculates on Rs 44.38 lakh for 228 months, dropping from Rs 43,391 to approximately Rs 39,640. Total interest under this mode is higher than the reduce-tenure route because the loan runs longer.
Reduce Tenure vs Reduce EMI: Which Is Better?
Reduce tenure saves more interest, always. When you cut the tenure, you eliminate months of future interest entirely. When you reduce the EMI, you keep paying for the same number of months, just a smaller amount each time. The mathematical result is that every rupee of interest saving from tenure reduction is higher than from EMI reduction, for the same prepayment amount.
The comparison on a Rs 50 lakh loan at 8.5%, Rs 5 lakh prepayment at month 12:
| Metric | Without Prepayment | Reduce Tenure | Reduce EMI |
|---|---|---|---|
| Monthly EMI | Rs 43,391 | Rs 43,391 | Rs 39,640 |
| Tenure | 240 months (20 yr) | 192 months (16 yr) | 240 months (20 yr) |
| Total interest | Rs 54.1 lakh | Rs 45.9 lakh | Rs 47.5 lakh |
| Interest saved | -- | Rs 8.2 lakh | Rs 6.6 lakh |
Choose reduce EMI only if you genuinely need the cash flow relief. If your job is stable and your current EMI is manageable, reduce tenure. The Rs 1.6 lakh difference in interest savings between the two modes on this example grows larger as the loan amount increases.
Home Loan Prepayment Charges: Bank Comparison
Per RBI's guidelines effective October 2019, no bank can charge prepayment penalties on floating-rate home loans to individual borrowers. This applies to both part and full prepayment. Fixed-rate home loans are exempt from this rule and typically carry a 2% penalty.
| Bank / Lender | Floating Rate | Fixed Rate |
|---|---|---|
| SBI | Nil | 2% |
| HDFC Bank | Nil | 2% |
| ICICI Bank | Nil | 2% |
| Axis Bank | Nil | 2% |
| LIC HFL | Nil | 2% to 3% |
Rates are as of July 2026 and subject to change. Always verify directly with your lender before making a prepayment, especially if your loan has both floating and fixed rate segments.
Best Time to Make a Prepayment
The best time is as early in the loan tenure as possible. In the first year of a standard 20-year loan at 8.5%, approximately 71% of each EMI goes to interest and only 29% to principal. By year 10, the split is roughly 50-50. By year 18, principal dominates. Prepaying in year 1 eliminates years 17-20 of the schedule, which are interest-light; prepaying in year 15 only eliminates years 19-20, which carry far less interest anyway.
The ideal scenario: receive a bonus or windfall in years 1 through 5, and route it directly toward prepayment before investing in lower-yield options. A Rs 10 lakh prepayment on a Rs 50 lakh loan at 8.5% at month 12 saves approximately Rs 16 lakh in interest and cuts tenure by 8 years. That is a guaranteed tax-free return that no fixed deposit or bond can match.
One practical note: if you are in the old tax regime and claiming Section 24(b), your effective interest cost is reduced by your tax bracket. At 30% tax, the effective rate on an 8.5% loan drops to about 5.95%. In that case, equity investments with expected returns above 6% may match or beat prepayment benefit. Under the new tax regime, no such adjustment applies and the 8.5% savings are absolute.
How to Use This Prepayment Calculator
The calculator requires four inputs and produces a complete savings breakdown in real time. Here is the exact sequence:
- Set the original loan amount: Use the slider or click the value button to type. For example, Rs 50 lakh for a typical metro home purchase.
- Enter the annual interest rate: Use your actual loan rate. SBI floating rate starts at 8.25% as of July 2026; HDFC starts at 8.35%. Adjust to match your sanction letter.
- Set the original tenure: The tenure at which the loan was sanctioned. Use the year preset buttons (5Y, 10Y, 20Y) for quick selection.
- Enter the prepayment amount: The lump sum you plan to pay. Start with what you have available and see the impact before committing.
- Set prepayment month in More settings: Click "More settings" and drag the slider to indicate when in the tenure you will prepay. Month 12 means after your first year of EMIs.
- Toggle between Reduce Tenure and Reduce EMI: Use the tab at the top of the calculator card. Compare both modes to decide which suits your situation.