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Loan Prepayment Calculator

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Calculate how much interest you save and how many months you cut by prepaying your home or personal loan. Compare lumpsum vs extra EMI prepayment strategies.

Loan Details

Outstanding Loan Amount₹50,00,000
₹1,00,000₹10,00,00,000
Annual Interest Rate8.5%
1%25%
Remaining Tenure240 mo
6 mo360 mo
Prepayment Type
Lumpsum Amount₹5,00,000
₹1,000₹5,00,00,000
Prepayment at Month12 mo
1 mo240 mo

What is a Prepayment?

A Loan Prepayment Calculator shows exactly how much interest you save and how many months you cut off your loan by making payments beyond the scheduled EMI — whether as a single lumpsum or as an increased monthly contribution. It simulates your loan month by month, applies the prepayment at the point you specify, and delivers a precise before-and-after comparison of total interest, total payment, and remaining tenure.

Home loans are the largest financial commitment most Indians make. A ₹60 lakh home loan at 8.5% for 20 years accrues ₹64.5 lakh in total interest — meaning you pay more in interest than the principal itself. This is the defining characteristic of long-tenure reducing-balance loans: early years are almost entirely interest, with principal reduction accelerating only in the final years. A targeted prepayment disrupts this curve dramatically.

When you prepay ₹5 lakh in month 12 of a 20-year loan, that ₹5 lakh would otherwise have generated approximately 19 years of interest charges. Eliminating it early creates a cascading effect — every subsequent month's interest is computed on a lower balance, creating compounding savings that far exceed the prepayment amount itself. The Loan Prepayment Calculator makes this effect visible with exact numbers.

India's banking regulator (RBI) has eliminated prepayment penalties on floating-rate home loans, removing the last friction from this strategy. Any surplus from a salary bonus, matured FD, or annual appraisal hike can now be directed toward the loan without cost. Understanding the interest saving before acting on a prepayment decision is what this calculator enables. Pair it with the EMI Calculator for the full picture of your home loan economics, or use the Loan Amortization Calculator to see the full month-by-month schedule.

How to use this Prepayment calculator

  1. Enter Outstanding Loan Amount — use your current outstanding balance, not the original loan amount. Find this on your latest bank statement or netbanking portal under "outstanding principal."
  2. Set Annual Interest Rate — use your current floating rate (check your loan account statement for the exact rate applicable today).
  3. Set Remaining Tenure — the number of months left on your loan. For a 20-year loan taken 3 years ago, this is approximately 204 months.
  4. Choose Prepayment Type — select "One-time Lumpsum" if you have a fixed amount ready to pay, or "Extra Monthly Amount" if you plan to increase your EMI.
  5. Enter Prepayment Amount — the lumpsum amount, or the extra monthly amount above your current EMI.
  6. For Lumpsum: set Prepayment Month — the month number (from today) at which you plan to make the payment. Month 1 = this month; Month 12 = one year from now.
  7. Read the savings — the result shows months saved, interest saved, and the full before/after comparison.

Formula & Methodology

EMI Formula:
EMI = P × r × (1+r)ⁿ / ((1+r)ⁿ − 1)

Where P = outstanding principal, r = monthly interest rate (annual rate ÷ 12 ÷ 100), n = remaining months.

Prepayment Simulation (month-by-month):
For each month: Interest = Outstanding Balance × r; Principal Paid = EMI − Interest; Balance = Balance − Principal.
At prepayment month (lumpsum): Balance = Balance − Prepayment Amount.
For extra EMI: Monthly Payment = EMI + Extra Amount each month.

Loop continues until balance reaches zero. Total months = new tenure; Total interest = sum of all monthly interest payments.

Worked example: A Bengaluru IT professional has an outstanding home loan of ₹45 lakh at 8.5% with 18 years (216 months) remaining.

- Current EMI = ₹45,00,000 × (0.00708) × (1.00708)²¹⁶ / ((1.00708)²¹⁶ − 1) = ₹39,914/month
- Original total interest (without prepayment) = ₹39,914 × 216 − ₹45,00,000 = ₹41,61,424

She receives a ₹3 lakh annual bonus and decides to prepay in month 12.

- After simulation with ₹3 lakh lumpsum at month 12:
- New tenure: 192 months (24 months saved = 2 years)
- New total interest: ₹35,18,000 (approximately)
- Interest saved: ₹6,43,000 on a ₹3 lakh prepayment — a 2.14× return, guaranteed

If she instead adds ₹5,000/month (₹25,000 extra per quarter equivalent): new tenure ≈ 183 months, interest saved ≈ ₹9.2 lakh over the loan life.
Frequently Asked Questions
What is a loan prepayment and how does it save money?
A loan prepayment is any payment made towards your loan principal over and above the scheduled EMI. Because home loan interest is calculated on the outstanding principal, reducing the principal early means every subsequent EMI has a lower interest component — the loan closes faster and the cumulative interest paid is significantly lower. Even a single prepayment of ₹1–5 lakh on a ₹50 lakh home loan can save ₹5–15 lakh in total interest depending on when it is made.
Which saves more interest — lumpsum prepayment or extra monthly EMI?
Both strategies reduce the principal and save interest, but the timing matters. A large lumpsum early in the loan tenure saves more than the same amount spread over months, because it eliminates a larger principal balance sooner. Extra monthly EMI contributions compound the savings month by month and are easier to sustain without a windfall. The Loan Prepayment Calculator lets you compare both strategies with your exact loan numbers.
When is the best time to make a lumpsum prepayment?
The earlier in the loan tenure, the better — prepayments made in the first 5 years of a 20-year loan save significantly more than the same prepayment made in year 15. In the early years, 80–90% of each EMI goes toward interest; reducing the principal at this stage compounds the savings. The Loan Prepayment Calculator lets you test different prepayment months to see the impact.
Does prepayment affect the EMI or the loan tenure?
In India, banks typically offer two options: reduce the tenure (keep EMI the same) or reduce the EMI (keep tenure the same). The Loan Prepayment Calculator models the reduce-tenure option, which saves more interest because the principal is paid down faster. Most financial advisers recommend the reduce-tenure option for maximum interest savings.
Are there prepayment charges on home loans in India?
As per RBI regulations, banks and housing finance companies cannot charge prepayment penalties on floating-rate home loans to individual borrowers. Fixed-rate loans and loans from some non-banking financial companies (NBFCs) may carry a prepayment charge of 1–4% of the prepaid amount. Check your loan agreement's prepayment clause before calculating net savings — the Loan Prepayment Calculator shows gross interest savings, not net of any penalty.
How much should I prepay on my home loan each year?
A practical guideline is to prepay one additional EMI every year using annual bonus or incentive income. On a ₹50 lakh loan at 8.5% for 20 years, one extra EMI per year reduces the tenure by approximately 3–4 years and saves ₹10–15 lakh in interest. A more aggressive approach is to prepay 5–10% of the outstanding principal every year, which can cut the loan tenure nearly in half.
Should I invest a windfall or use it to prepay my home loan?
The decision depends on your home loan interest rate versus the expected return on investment after tax. If your home loan is at 8.5% and you can earn 12%+ in equity mutual funds (pre-tax), investing may be more beneficial long-term. However, if returns are uncertain or you are close to retirement, prepaying the guaranteed 8.5% interest saving is the safer choice. Use the [CAGR Calculator](/cagr-calculator/) to benchmark expected investment returns before deciding.
How does the Loan Prepayment Calculator work?
Enter your outstanding loan amount, interest rate, and remaining tenure. Select whether you are making a one-time lumpsum or increasing your monthly payment. Enter the prepayment amount (and, for lumpsum, the month at which you plan to pay). The calculator simulates your loan month by month, applies the prepayment at the specified point, and shows you the new tenure, total interest, and exact savings.
What is the difference between part-payment and foreclosure?
Part-payment (partial prepayment) reduces the outstanding principal by a fixed amount while the loan continues — your EMI or tenure adjusts downward. Foreclosure (full prepayment) closes the loan entirely by paying the remaining outstanding principal plus any applicable charges. The Loan Prepayment Calculator models part-payments; foreclosure savings equal the full remaining interest that would have been paid.
Can I use this calculator for personal loans or car loans?
Yes — the calculation works identically for any reducing-balance loan: home loan, personal loan, car loan, or education loan. Enter the outstanding balance, current interest rate, remaining months, and planned prepayment amount. The interest savings and months-saved outputs apply regardless of loan type.
How does prepayment interact with the tax deduction on home loan interest?
Home loan interest is deductible up to ₹2 lakh per year under Section 24(b) of the Income Tax Act (for self-occupied property). Prepaying reduces the interest component of future EMIs, which could reduce your annual tax deduction if you are claiming the old tax regime. Net of tax, the savings are slightly lower than the gross interest saved. Factor in the effective after-tax interest cost when comparing prepayment versus investment options.

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