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Transparent calculation notes for Home Loan Prepayment Calculator.
Formula used
EMI plus balance-reduction simulation
EMI = P x r x (1 + r)^n / [(1 + r)^n - 1]
The calculator first computes the normal EMI, then simulates outstanding balance after EMIs and prepayments.
Methodology
- Build the original amortization path.
- Apply the selected prepayment amount at the selected start year and frequency.
- Compare total interest, EMI, and tenure before and after prepayment.
Core assumptions
- Interest rate stays constant during the simulation.
- Prepayments are applied exactly as selected.
- The selected lender strategy is either reduce tenure or reduce EMI.
Not included
- Floating-rate resets, tax benefits, lender processing delays, and prepayment fees are excluded.
- Actual bank recalculation can differ from the simplified model.
About Home Loan Prepayment Calculator
Guide1What is Home Loan Prepayment?
Home loan prepayment refers to paying an amount over and above your regular EMI to reduce the outstanding principal. This can be done as a lump sum (partial prepayment) or by increasing your EMI amount. Prepayment is one of the most effective ways to reduce the total interest burden on a home loan.
Since home loans in India typically run for 15-30 years, even small prepayments in the early years can save lakhs of rupees in interest due to the compounding effect.
2How Prepayment Saves You Money
When you make a prepayment, the entire amount goes toward reducing the principal. This has a cascading effect:
- Reduced Principal: The outstanding loan amount decreases immediately
- Lower Interest: Future interest is calculated on the reduced principal
- Shorter Tenure or Lower EMI: You can choose to reduce either the tenure or the EMI amount
For example, on a ₹50 lakh, 20-year loan at 8.5%, a one-time ₹5 lakh prepayment in year 3 saves about ₹14.5 lakh of interest and ends the loan 44 months (3 years 8 months) early. The same ₹5 lakh in year 7 saves about ₹9.5 lakh. The earlier you prepay, the more it saves (Reduce Tenure):
- Year 1: about ₹17.5 lakh saved, 51 months (4 years 3 months) sooner
- Year 3: about ₹14.5 lakh saved, 44 months (3 years 8 months) sooner
- Year 5: about ₹11.8 lakh saved, 38 months (3 years 2 months) sooner
- Year 7: about ₹9.5 lakh saved, 33 months (2 years 9 months) sooner
3How to Use This Prepayment Calculator
- Step 1: Enter your original loan details — amount, interest rate, and tenure
- Step 2: Specify the prepayment amount and when you plan to make it
- Step 3: Choose whether to reduce tenure or reduce EMI after prepayment
- Step 4: Compare the total interest with and without prepayment
4Prepayment Rules in India
- Floating-rate loans: lenders can't charge prepayment or foreclosure fees to individual borrowers. Banks have been barred since 2012 for floating-rate home loans (RBI DBOD.Dir.BC.No.107/13.03.00/2011-12, 5 June 2012); a 2014 circular extended the bar to all floating-rate term loans to individuals; and for loans sanctioned or renewed from 1 January 2026 the RBI (Pre-payment Charges on Loans) Directions, 2025 apply it to all lenders.
- Fixed-rate loans: a fee may apply, often about 2% of the amount prepaid; it must be stated in your sanction letter and Key Facts Statement.
- Tax (old regime only): from 1 April 2026 home-loan interest is deducted under section 22 (formerly 24(b)) and principal counts under section 123 (formerly 80C) of the Income-tax Act, 2025. Under the default new regime a self-occupied home gets no deduction, so prepaying costs you no tax benefit.
- Minimum amount: some banks require a minimum prepayment (for example, 1-3 EMIs).
Frequently Asked Questions
FAQShould I prepay my home loan or invest the money?
If your home loan rate is 8.5% and you can earn 12-14% through equity investments over the long term, investing may yield higher returns. However, loan prepayment offers guaranteed savings. Consider a balanced approach — maintain an emergency fund, invest for long-term goals, and use surplus funds for prepayment.
Is it better to reduce tenure or EMI after prepayment?
Reducing tenure saves more on total interest compared to reducing EMI. However, if you need lower monthly outflow for cash flow management, reducing EMI is a valid choice.
When is the best time to prepay a home loan?
Prepayments are most effective in the early years of the loan when the interest component of your EMI is highest. A prepayment in year 2-3 saves far more than the same prepayment in year 15-20.
Can I prepay my home loan using a bonus or windfall?
Yes, using annual bonuses, tax refunds, or any windfall gains for partial prepayment is a smart financial strategy. Most banks allow multiple prepayments during a year without restrictions on floating rate loans.
Will prepaying my home loan affect my tax benefits?
Only under the old tax regime. There, prepaying lowers your future interest, so the interest deduction under section 22 (formerly 24(b), up to ₹2 lakh a year for a self-occupied home) can fall; the principal you repay counts under section 123 (formerly 80C) within its ₹1.5 lakh limit. Under the default new regime a self-occupied home gets no deduction, so prepaying costs you no tax benefit.