Finance Calculator
Lump Sum Prepayment Calculator workspace
This interactive finance module is built for quick scenario testing with validated inputs, polished summaries, and reusable calculation logic.
Revised monthly EMI
₹38,201.85
This is the EMI for month one, before any step-up change in later years.
Revised total interest
₹35,75,440.46
Total interest payable across the full repayment period.
Revised payoff time
16y 7m
Payoff in year 17, month 7.
Total paid
₹80,75,440.46
Principal plus all interest payments.
Savings vs standard repayment
Interest saved
₹10,93,002.55
Time saved
3y 5m
Strategies applied
Loan balance trend (years vs payable amount)
Standard payoff
Around year 20
Advanced payoff
Around year 17
Opening balance: ₹45,00,000.00
Yearly payment trend
Yearly amortization summary
| Year | Opening balance | Principal paid | Interest paid | Closing balance |
|---|---|---|---|---|
| 1 | ₹45,00,000.00 | ₹92,860.67 | ₹3,65,561.48 | ₹44,07,139.33 |
| 2 | ₹44,07,139.33 | ₹1,00,768.05 | ₹3,57,654.10 | ₹43,06,371.27 |
| 3 | ₹43,06,371.27 | ₹1,09,348.76 | ₹3,49,073.39 | ₹41,97,022.51 |
| 4 | ₹41,97,022.51 | ₹1,18,660.15 | ₹3,39,762.00 | ₹40,78,362.36 |
| 5 | ₹40,78,362.36 | ₹6,67,658.55 | ₹2,90,763.60 | ₹34,10,703.80 |
| 6 | ₹34,10,703.80 | ₹1,85,617.65 | ₹2,72,804.50 | ₹32,25,086.16 |
| 7 | ₹32,25,086.16 | ₹2,01,423.57 | ₹2,56,998.58 | ₹30,23,662.59 |
| 8 | ₹30,23,662.59 | ₹2,18,575.41 | ₹2,39,846.74 | ₹28,05,087.17 |
| 9 | ₹28,05,087.17 | ₹2,37,187.79 | ₹2,21,234.36 | ₹25,67,899.38 |
| 10 | ₹25,67,899.38 | ₹2,57,385.07 | ₹2,01,037.08 | ₹23,10,514.31 |
Comparison baseline: standard EMI schedule would end in 20.0 years with total interest of ₹46,68,443.02.
How to use
Step 1
Enter the loan amount, annual interest rate, and total repayment tenure in years.
Step 2
Enable the one-time lump-sum prepayment option and enter the prepayment amount.
Step 3
Set the timing using either year and month from loan start, or an exact month index.
Step 4
Review the revised payoff month, interest saved, and months saved compared to the original plan.
Step 5
Test different prepayment amounts and timings to find the most cost-effective strategy.
Formula and method
This calculator uses the shared advanced loan engine to model the exact impact of a single one-time lump-sum principal prepayment, showing how it shortens tenure and reduces total interest compared to the standard repayment schedule.
Example calculation
These examples show how changing the prepayment amount or timing shifts the interest saved and months cut, making it easier to decide when and how much to prepay.
Example 1
A 4,500,000 home loan at 8.2% for 20 years can save several years of EMI and significantly reduce total interest if a lump sum of 500,000 is applied in year 5.
Example 2
A car loan of 900,000 at 9.1% benefits more from a prepayment applied in year 2 than in year 5 because early prepayments reduce interest accrual over more remaining months.
Example 3
Even a relatively modest one-time prepayment on a longer home loan can produce surprisingly large interest savings over the remaining tenure.
Lump Sum Prepayment Calculator FAQ
What is a lump-sum prepayment on a loan?
A lump-sum prepayment is a one-time payment made directly toward outstanding principal, separate from the regular EMI. It reduces the principal balance immediately, which lowers future interest accrual and can shorten the loan tenure.
When is the best time to make a lump-sum prepayment?
Earlier prepayments generally produce larger savings because the principal reduction compounds over more remaining months. However, even a mid-tenure prepayment can meaningfully reduce total interest on long-term loans.
Does this calculator change my EMI or just the tenure?
This calculator keeps your EMI fixed at the original amount and shows how many fewer months are needed to fully repay the loan after the prepayment is applied.
Is there a minimum prepayment amount that makes a difference?
There is no fixed threshold, but larger amounts applied earlier in the loan produce proportionally more savings. Even a partial prepayment that equals a few months of EMI can reduce total interest meaningfully.
Can I combine a one-time prepayment with regular extra EMI payments?
Yes. The workspace also supports extra EMI per year and yearly lump-sum payments so you can model combined repayment strategies in the same calculation.
Does the calculator account for prepayment charges?
No. Many floating-rate loans in India have no prepayment penalty, but fixed-rate loans may. Check your loan agreement and subtract any applicable fee from the prepayment amount before entering it here.
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