Prepaying part of your home loan with surplus cash — a bonus, an inheritance, or just accumulated savings — is one of the most effective ways to save interest. The earlier in the loan you prepay, the more interest you save, because more of every future EMI was going to be interest. This calculator shows the exact rupee saving from any prepayment scenario.
What is Home Loan Prepayment?
When you make a part-prepayment on a home loan, two things can happen — your EMI stays the same and your tenure shortens, or your tenure stays the same and your EMI drops. Most banks let you choose. Tenure-reduction is mathematically more powerful: it saves more total interest because the loan is shorter overall.
RBI guidelines mandate zero prepayment penalty on floating-rate home loans for individuals. Fixed-rate loans may carry a small penalty (typically 1-2% of the prepayment amount). The calculator assumes no penalty by default — adjust if your loan has one.
How the saving is calculated
The calculator simulates two amortisation schedules in parallel. Schedule A is your existing loan — original tenure, original EMI, no prepayment. Schedule B is the same loan with your prepayment applied at the chosen month. The difference between the two schedules' total interest paid is your saving.
Prepayments early in the loan save much more than prepayments late. Year 1 of a 20-year loan is roughly 70-80% interest in each EMI; year 18 is roughly 5-10%. A ₹5 lakh prepayment in year 1 might save ₹15 lakh in interest; the same prepayment in year 15 might save only ₹1.5 lakh.
- Schedule A
- Baseline—amortisation without prepayment
- Schedule B
- With prepay—amortisation after applying prepayment
How to use this calculator
Enter your loan basics
Original loan amount, the interest rate, and the original tenure when you signed up. These come straight from your sanction letter.
Enter the year of prepayment
Year 1 means within the first 12 months of the loan; year 5 is between months 49-60. Earlier is better — the calculator will show how much the timing matters.
Enter the prepayment amount
The lump-sum cash you plan to put in. Banks usually require minimums of ₹10,000-25,000 per prepayment but allow them at any time.
Compare tenure-reduction vs EMI-reduction
Tenure reduction saves more interest mathematically. EMI reduction frees up monthly cash flow. The calculator shows both — pick based on whether you need the extra cash flow now or later.
When to use it
Annual bonus deployment
Many salaried employees get a year-end bonus or variable pay. A recurring annual prepayment of even ₹1-2 lakh can shave 4-7 years off a 20-year home loan.
Inheritance or windfall
Compare the after-tax return you would get investing the windfall (mutual fund, FD, equities) versus the guaranteed 'return' of saving home loan interest. For most households at standard tax brackets, prepayment beats taxable investment options.
Pre-retirement cleanup
Many retirees prefer to enter retirement debt-free. The calculator shows how much you would need to prepay to clear the loan by your target retirement date.
Common mistakes to avoid
Choosing EMI reduction when tenure reduction would save more
Tenure reduction wins on total interest. Pick EMI reduction only if you specifically need the monthly cash flow — for a job change, a baby, or other life event.
Prepaying instead of investing without comparing returns
If your loan is at 7% and you can comfortably earn 12% in equities long term, investing may win. But for most households, prepayment is a guaranteed risk-free return — equity is not. Run both numbers, don't assume.
Forgetting that prepayment is irreversible
Once paid, the bank doesn't refund a prepayment if you need the money back. Prepay only what you genuinely don't need for at least 2-3 years.
Frequently asked questions
Tenure reduction or EMI reduction — which is better?
When in the loan should I prepay?
Will the bank charge a prepayment penalty?
Should I prepay the loan or invest the surplus instead?
How does prepayment affect Section 24 tax benefits?
Can I prepay multiple times during the loan?
References
- RBI rules on prepayment penalty (floating-rate home loans)— Reserve Bank of India