Loan Prepayment Calculator
See how much interest and tenure you save by making a lump-sum prepayment on a running loan.
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About the Loan Prepayment Calculator
Loan Prepayment Calculator shows the exact rupee impact of paying off a chunk of an existing loan early. Enter the original principal, annual interest rate, total tenure, your prepayment amount and the month in which the prepayment is made — the tool then runs a month-by-month amortisation simulation, applies the prepayment to the outstanding principal at the chosen month and continues the same EMI until the balance reaches zero. The output reports the interest you save, the number of months your tenure shrinks by and the new closure date. Because the math is a precise simulation rather than a closed-form approximation, the numbers match the bank's own statements down to the rupee.
How to use
- Enter the loan amount, interest rate (per annum) and original tenure in years.
- Enter your one-time prepayment amount and the month in which you plan to pay it.
- Click Calculate to see interest saved and tenure reduction.
Benefits & key features
- Exact month-by-month simulation, not a formula approximation.
- Reports interest saved AND number of months trimmed off the tenure.
- Useful for deciding between a prepayment and an investment alternative.
- Pairs with the EMI Amortization tool for a full repayment plan.
Pro tip
Early prepayments save the most because the outstanding principal — and therefore the daily interest bill — is highest in the first years of a loan.
Why choose toolsfy for Finance tools?
Finance calculators on banking websites are designed to sell products. toolsfy's are designed to answer a question. Every formula is written out on the landing page so you can audit it against your bank's own fine print, and every calculation respects Indian conventions — rupees, lakhs, financial-year slabs, GST tiers — without forcing you into an anglicised spreadsheet.
Common use cases
- Home-loan applicants comparing EMI under different tenure options before their bank appointment on Monday.
- Small-business owners estimating break-even units before launching a new product line, with fixed costs and contribution margin shown transparently.
- Salaried professionals choosing between the new and old income-tax regime, slab-by-slab, before the next TDS declaration deadline.
Frequently asked questions
Are tax rates up to date?
Yes — the Income Tax calculator uses the FY 2024-25 slabs announced in the Union Budget. GST and surcharge bands reflect the latest CBIC notifications.
Does this replace a CA or financial adviser?
No. These calculators are decision helpers for routine questions. Anything involving capital gains, NRI status or trust income still needs a qualified professional.
Can I export a report?
Copy the detailed output panel — it includes the full formula breakdown — or take a screenshot. There is no cloud export because no cloud is involved.