Loan Prepayment Calculator
Enter your loan details and prepayment amount to see exactly how many months you save and how much interest you eliminate — with a side-by-side comparison of reduce-tenure vs. reduce-EMI.
Loan Prepayment Calculator
See exactly how much interest you save and how many months you cut by making a part-prepayment.
| EMI Stays | ₹43,391/month |
| Months Cut | 41 months (3y 5m) |
| Interest Saved | ₹12.79 L |
| Revised Total Interest | ₹41.35 L |
| New EMI | ₹38,750/month |
| EMI Reduction | ₹4,641/month |
| Interest Saved | ₹4.47 L |
| Revised Total Interest | ₹49.67 L |
About Loan Prepayment Calculator
Making a part-prepayment on your home loan is one of the highest-return, zero-risk financial decisions an Indian borrower can make. When you prepay ₹5 lakhs on a ₹50 lakh home loan at 8.5% with 17 years remaining, you save approximately ₹13–16 lakhs in total interest — a guaranteed 260%–320% return on your ₹5 lakh "investment," tax-free, with no market risk. No equity fund, no FD, and no PPF can reliably guarantee that return on deployed capital. This is why prepayment almost always beats alternative investments in the early-to-mid years of a home loan.
The reason prepayment is so powerful is the structure of loan amortization. In the early years of a home loan, a very large fraction of each EMI goes toward interest and very little toward principal repayment. On a ₹50L loan at 8.5% for 20 years, the monthly EMI is ₹43,391. In month 1, ₹35,417 of that EMI is interest and only ₹7,974 reduces the principal. When you make a lump-sum prepayment, 100% of it goes toward reducing the principal immediately — which then reduces the outstanding balance, which reduces every future month's interest charge. The effect compounds over the remaining tenure.
After a prepayment, you face a choice: reduce tenure (keep same EMI) or reduce EMI (keep same tenure). In almost all cases, reducing the tenure saves significantly more interest. Here is why: if you reduce the EMI, you stretch the same debt over the same number of months, just at a lower monthly payment — but the interest continues to accrue on the outstanding balance for the full remaining tenure. If you reduce the tenure, you clear the debt faster, which means fewer months of interest charges on a smaller outstanding principal. The calculator shows you the exact difference for your specific scenario.
The timing of prepayment matters significantly. A prepayment made in year 3 of a 20-year loan saves far more interest than the same prepayment made in year 15. This is because in year 3, there are 17 years of compounding interest charges still ahead — each prepaid rupee eliminates interest on itself for all 17 remaining years. In year 15, only 5 years remain, so the same prepayment saves interest for only 5 years. As a rule of thumb: the earlier you prepay, the higher your effective return on that prepayment. Use the "prepay at year" input in this calculator to compare early vs. late prepayment scenarios.
How to Use the Loan Prepayment Calculator
Enter your original loan details — the initial loan amount (not the current outstanding — enter what you originally borrowed), the interest rate (the current rate if it has changed since origination), and the original tenure in years.
Enter the prepayment amount — the lump sum you plan to pay toward the principal. This should be a realistic amount you have available — common prepayment amounts are annual bonuses, inheritance, or accumulated savings.
Set the prepayment year — the year at which you plan to make the prepayment, counted from loan start. For a 20-year loan taken in 2021, prepaying in 2024 means entering Year 3.
Read the outstanding balance — the calculator shows your outstanding principal at the chosen year and the balance after deducting your prepayment.
Compare Option A vs. Option B — Option A (reduce tenure) saves more total interest. Option B (reduce EMI) frees up monthly cash flow. The recommendation card tells you which saves more.
Pro Tips
The return on prepayment is directly proportional to the remaining tenure. A ₹1 lakh prepayment at 8.5% saves ~₹2.1L if done in year 2 of a 20-year loan (18 years of interest saved) versus only ~₹28,000 if done in year 17 (3 years saved). Prepaying in the first 5–7 years gives the highest effective return.
Financial advisors almost universally recommend reducing tenure over reducing EMI after a prepayment. Reduce tenure eliminates years of future interest compounding. Reduce EMI just lowers your monthly pain while still paying interest for the full remaining period. The only exception: if your current EMI is genuinely straining monthly cash flow, reducing it provides needed relief.
For floating-rate home loans: RBI mandates that banks cannot charge prepayment penalties on floating-rate home loans (applicable since 2012). For fixed-rate loans: banks can charge 0.5%–2% on the prepaid amount. For personal loans and car loans: prepayment charges of 1%–5% may apply. Always confirm with your bank before making a large prepayment — a 2% charge on ₹10L = ₹20,000, which you should factor into your savings calculation.
Frequently Asked Questions
How does loan prepayment reduce interest paid?
Every loan EMI has two components: principal repayment and interest. The interest component is calculated as outstanding principal × monthly rate. When you make a prepayment, it directly reduces the outstanding principal — which reduces the interest charged on every future EMI. For example, on a ₹50L loan at 8.5% with ₹48.7L outstanding, the monthly interest is ₹34,447. After a ₹5L prepayment, outstanding drops to ₹43.7L and monthly interest becomes ₹30,912 — saving ₹3,535/month in interest for all remaining months. Multiplied by the remaining tenure, the savings are substantial.
Should I prepay my home loan or invest the money?
Compare the guaranteed post-tax cost of your loan versus the expected post-tax return on investments. Your home loan at 8.5% costs 8.5% guaranteed. A prepayment saves you 8.5% guaranteed, risk-free. An equity mutual fund might return 12%–14% but with volatility and 12.5% LTCG tax on gains above ₹1.25L/year (effective post-tax return ≈ 10.5%–12%). For the first 7–10 years of a home loan (when interest content is highest), prepayment often competes favorably with equity investment in pure return terms — plus it reduces financial risk and stress. After year 10, when your loan is mostly principal, equity investment typically wins. Many advisors recommend prepaying aggressively in years 1–7, then investing in equity in years 8+.
What is the outstanding balance calculation used in this tool?
The outstanding principal after N months is calculated using the formula: Outstanding = P × (1+r)^N − EMI × ((1+r)^N − 1) / r, where P = original loan amount, r = monthly rate (annual rate ÷ 12), N = number of EMIs paid, EMI = original EMI. This is the standard reducing-balance outstanding balance formula. Note: this assumes all EMIs were paid on time and the interest rate has remained constant. If your rate has changed (as with floating-rate loans), the actual outstanding will differ — use your bank's loan statement for the precise figure.
Can I make multiple prepayments over the loan tenure?
Yes, and multiple smaller prepayments over several years can be even more effective than a single large prepayment. Many borrowers invest their annual bonus (December–March for most corporates) as a prepayment every year. For example, making ₹1L prepayment every year for 5 years starting from year 2 of a ₹50L home loan at 8.5% saves more interest than a single ₹5L prepayment at year 3. This is because the first ₹1L prepayment reduces the base for all subsequent calculations, making each subsequent prepayment progressively more effective. Use this calculator for each individual prepayment to understand the marginal savings.
Does RBI allow banks to charge prepayment penalties on home loans?
For floating-rate home loans: No. The RBI issued a circular in 2012 (later reinforced in 2019 for HFCs via NHB) prohibiting banks and housing finance companies from charging prepayment penalties on floating-rate home loans taken by individual borrowers. This applies to all public sector banks, private banks, and HFCs like HDFC, LIC HF, etc. For fixed-rate home loans: Yes, prepayment charges of up to 2%–3% are permitted. If your loan has switched from fixed to floating (many 2–3 year fixed then floating loans), the floating-rate prohibition applies after the switch. Always verify with your bank's loan agreement — some legacy loans pre-2012 may still have penalty clauses that are difficult to waive.
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