Loan Prepayment & Part-Payment Calculator
Calculate massive interest savings and tenure reduction by making one-time lump sum or regular monthly part payments on your home loan.
One-time prepayment amount paid towards principal.
At which month from loan start date will you make this lump sum?
Additional amount paid every month along with regular EMI.
Loan closes 6 yrs 10 mo earlier than original tenure
Amortization with Prepayment vs Original
Compounding trajectory over time
Scenario Analysis: Loan With vs Without Prepayment
Exact interest and tenure reduction comparison
Year-by-Year Prepayment Impact
Detailed breakdown for each calendar year
| Year | Revised Balance | Original Balance | Cumulative Interest Saved |
|---|---|---|---|
| Year 1 | ₹48,38,095 | ₹49,00,489 | ₹2,394 |
| Year 2 | ₹41,61,879 | ₹47,92,181 | ₹10,302 |
| Year 3 | ₹39,25,892 | ₹46,74,300 | ₹68,409 |
| Year 4 | ₹36,69,045 | ₹45,46,000 | ₹1,36,955 |
| Year 5 | ₹33,89,496 | ₹44,06,359 | ₹2,16,863 |
How this is Calculated: Loan Prepayment Math
Mathematical Formula
Variable Definitions
Worked Example Walkthrough
Scenario: ₹50,00,000 loan at 8.5% for 20 years with ₹5L part payment at month 24.
Calculation: Original interest: ₹54.13L. With ₹5L prepayment at Yr 2, balance drops to ₹43.2L.
Result: Saves approx ₹11.5 Lakhs in interest and terminates loan ~4 years early!
Assumptions & Methodology
- Prepayments are credited directly against outstanding principal.
- Indian RBI guidelines forbid prepayment penalties on floating rate retail home loans.
- Interest is recalculated on the reduced principal balance immediately from next cycle.
About this Calculation Model
The Loan Prepayment Calculator analyzes the dramatic financial impact of making one-time lump sum part-payments or regular monthly surplus payments towards your outstanding home loan principal. It recalculates the amortization curve month-by-month to demonstrate exact interest savings and tenure reduction.
How to Choose Your Calculator Inputs
1Current Loan Balance
Your current outstanding principal balance as per your latest bank loan statement.
2Annual Interest Rate (%)
Your prevailing home loan interest rate.
3Original / Remaining Tenure
The remaining number of years scheduled on your loan.
4Prepayment Strategy
Choose between "Reduce Tenure" (maintaining the same EMI to close the loan years earlier) or "Reduce Monthly EMI" (lowering monthly outgo while keeping tenure constant).
5Lump Sum Part Payment
A one-time payment made directly against the principal balance at a specific month.
6Monthly Extra Prepayment
An ongoing monthly surplus paid alongside your regular EMI (e.g., adding ₹5,000 extra each month).
Interpreting Your Projections
The "Total Interest Saved" metric reveals how much money you keep in your pocket rather than transferring to the bank. The comparison scenario visualizes the month where the loan terminates under prepayment versus the original scheduled payoff date.
Important Statutory & Practical Considerations
- Opportunity Cost: Capital used for loan prepayment cannot simultaneously compound in equities or high-yield assets. Compare your loan interest rate (e.g., 8.5% post-tax) with your potential investment returns.
- Tax Deduction Impact: Prepaying a home loan reduces annual interest paid, which may lower tax deductions claimable under Section 24(b) (capped at ₹2 Lakhs for self-occupied properties in the Old Tax Regime).
- Ledger Adjustment Lag: Most banks adjust part-prepayments against the principal ledger on the subsequent billing cycle, creating minor timing variations with theoretical models.
Frequently Asked Questions
Is it better to reduce tenure or reduce EMI when prepaying?
Reducing tenure delivers vastly higher cumulative interest savings because every month eliminated saves full interest on the remaining principal balance. Reducing EMI is primarily useful if your household requires immediate monthly cash-flow relief.
When is the best time to prepay a home loan?
Earlier is always better. Because interest is front-loaded in reducing-balance loans, prepaying in years 1–5 knocks off substantially more cumulative interest than prepaying near the end of the loan tenure.
Can I make multiple part-payments in a single financial year?
Yes. Most Indian banks permit multiple part-payments without restriction or penalty, subject only to basic minimum amounts (typically ₹10,000 to ₹25,000 per transaction).
Should I prepay my home loan or invest that surplus cash in equity mutual funds?
This depends on comparing the guaranteed effective cost of your loan (e.g. 8.5% post-tax) with your expected post-tax investment returns (historically 11%–14% CAGR in broad Indian equities) and your personal psychological preference for living debt-free.
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Commercial Partnership & Editorial Independence Notice
Finminto is a free, privacy-first financial utility. To sustain server infrastructure and continuous tool development without charging subscriptions or erecting paywalls, we may include links to licensed financial platforms, AMFI-registered mutual fund distributors, or banking partners.
- Zero Algorithmic Bias: Calculations, schedules, and mathematical formulas are strictly deterministic and never adjusted to favor any commercial partner.
- Zero Data Sharing: Your calculation inputs (loan amount, salary, investments) execute locally in your browser and are never passed to commercial partners.
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