Loan Prepayment Calculator
See what putting extra money into your loan actually buys you — how much interest it saves, how much sooner the loan ends, and whether investing that money instead would have left you better off.
What is loan prepayment?
A prepayment is any money you put toward the loan beyond the EMI. Your EMI was set on the assumption that the loan runs its full term, so anything extra comes straight off the principal. From that month on, interest is charged on a smaller balance.
Most lenders then give you a choice. Keep the EMI where it is and the loan finishes early; that's reducing the tenure. Keep the original end date and the EMI falls instead; that's reducing the EMI. Both save the same interest up to the month you prepay. They differ only in what happens after.
A step-up EMI is a different mechanism. There's no lump sum. The instalment itself rises by a fixed percentage every year, so the extra payment sits inside the schedule rather than arriving as a separate event.
What varies from one borrower to the next
Charges, minimum amounts, and caps on how often you can prepay in a year. There's no common standard. Each lender sets its own, and they're written into your loan agreement.
Money paid to the lender doesn't come back out. Getting at it again means applying for a top-up or a new loan, at whatever rate applies then.
A rupee saves interest at the rate of whatever debt it's paid into. Card and personal loan rates usually run well above a home loan's, so the same amount buys a different saving depending on where it goes.
This page weighs two uses of the money, prepaying and investing. It puts no number on an emergency buffer, a goal with a deadline, or a contribution that carries an employer match.
Reduce tenure vs reduce EMI
Cutting the tenure saves more interest. The loan closes earlier, so it stops accruing interest earlier. Cutting the EMI saves less, but it lightens every month from the prepayment onward. The table runs both on the same loan.
| ₹50L loan, 8.5%, 240 months, ₹5L prepaid in month 13 | Reduce tenure | Reduce EMI |
|---|---|---|
| EMI (from ₹43,391) | Unchanged | Drops to ₹38,964 from month 13 |
| Tenure | Shortens by 48 months | Unchanged at 240 months |
| Interest saved | ₹16.04L | ₹5.09L |
| Monthly cash flow | Unchanged until the loan ends early | ₹4,427 lighter each month, for the full term |
Why timing changes the saving
EMIs are front-loaded with interest. On the loan above, the first instalment is about 82% interest. That's what a reducing balance does: early on, interest is charged on an amount still close to the full borrowing. The share falls as the balance does, and the last few EMIs are almost all principal.
So the same rupee does different amounts of work depending on when it arrives. Take that ₹50L loan. Prepay ₹5 lakh in month 13 and you save ₹16.04L of interest, finishing 48 months early. Prepay the same ₹5 lakh in month 181 and you save ₹2.22L, finishing 16 months early. The principal you remove has fewer months left to accrue over. Nothing flips at any particular point. The saving tapers off as the remaining term does, and the calculator above prices whichever month you pick.
Step-up EMI: growing the instalment instead
Switch on step-up EMI and the instalment rises by your chosen percentage at the start of every year after the first. It applies whether or not a lump sum is also set. Each raise keeps working for the rest of the loan, so even 5% a year adds up to a large cut in total interest on a long tenure, and no single month asks you for a big payment.
Step-up vs a lump-sum prepayment
The two draw on different kinds of money. A step-up assumes income that rises on a schedule. One-time and recurring prepayments assume a sum that turns up on its own: a bonus, a maturity payout. Nothing stops you using both. Turn both on and the calculator runs them together, with every figure on the page following whatever you've set.
Prepay or invest: the arithmetic
Prepaying pays exactly the loan's interest rate. You know it in advance, and no market is involved. An investment return is a number you've assumed, and nobody owes it to you. To compare the two on the same footing you want the loan's effective rate after tax against an expected return after tax, not the sticker rate against an optimistic market number.
Tax decides which rate that is. Under the old regime, Section 24(b) lets you deduct up to ₹2 lakh a year of interest on a self-occupied home loan, putting the real cost below the stated rate. The new regime has no such deduction, so effective and stated come to the same thing. Prepaying moves tax around too. Principal repaid counts toward the ₹1.5 lakh Section 80C limit you're already sharing with EPF and PPF, and a smaller balance means a smaller 24(b) claim next year.
One thing a straight "interest saved vs investment gain" comparison leaves out: once the loan closes, the EMI itself is free to invest, and it compounds from then on. The section further up accounts for that. It reports total wealth at the end of the original term on both paths, after tax on any gains.
Where the two paths cross
Break-even sits where the after-tax return equals the effective loan rate. Above that line the invested path finishes ahead; below it, the prepaid one does. The further the loan has to run, the wider the gap gets either way. What the arithmetic can't price: the loan rate is written into a contract, the return is a guess, and money handed to the lender is no longer money you have.
Prepayment charges
Lenders can charge you for prepaying, though RBI rules have closed this off for most common cases:
| Loan type | Floating rate | Fixed rate |
|---|---|---|
| Home loan (individual borrower) | No charge | Charges may apply |
| Personal / auto loan (individual borrower) | No charge on floating-rate personal loans; auto loans vary by lender | Charges may apply |
Your own number is in the loan agreement, or the lender will tell you. Enter it above as a flat fee or a percentage. Every savings figure on this page already has it deducted.
How the gap behaves
- The two totals diverge most on a long remaining term with an assumed return above the effective rate, because the difference has more years to compound.
- On a short term, neither interest nor returns have much room to build. The totals land close, and a prepayment charge can swallow the difference.
- When the assumed return sits near the effective rate, the gap between the totals is smaller than the error in the assumption that produced it.
Part prepayment vs full foreclosure
A part prepayment, which is what this calculator models, knocks down the balance without closing the loan. Foreclosure clears the whole balance at once and ends it there. Where foreclosure charges apply they tend to be a percentage of what's outstanding rather than a flat fee. The same RBI relief on floating-rate loans to individuals usually covers foreclosure as well.
What prepaying changes
In reduce-tenure mode the loan ends before its original date instead of running the full course.
The earlier it lands, the more future interest it cuts off. A rupee does more in year 2 than in year 15.
Once the EMI drops or the loan closes, that money is no longer promised to the lender.
It comes off the principal for good. This isn't an account you can draw on later.
Assumptions and limitations
- EMIs use the standard reducing-balance method. A prepayment lands at the start of its month, before that month's interest is charged.
- Step-up raises the instalment every 12th month counted from the loan as you've entered it here, not from the original disbursal date. It can't model a one-off or irregular jump.
- The investment side assumes a single constant return and taxes it evenly, at 12.5% above the ₹1.25 lakh yearly exemption. Real returns arrive unevenly, and a real portfolio can straddle more than one tax treatment.
- Section 80C relief on the principal isn't in these numbers. For most people that ₹1.5 lakh is already spoken for by EPF, PPF, ELSS or insurance premiums.
- The rate is held flat for the rest of the tenure. Floating-rate resets aren't projected.
- Prepayment charges are whatever you enter above. The real terms are with your lender.
Frequently asked questions
Does prepaying always lower the EMI?
Only if you pick reduce-EMI. Most lenders default to shortening the tenure instead, leaving the EMI alone and ending the loan sooner. You choose at the time you prepay, and the toggle above shows both.
Is prepayment the same thing as a part-payment?
In everyday use, yes. Both mean paying off part of the balance ahead of schedule. Foreclosure is the word for clearing the whole thing at once.
Is there a minimum amount I can prepay?
Most lenders set a floor, often about one EMI, and limit how many part-payments you can make in a year. Your agreement has the exact numbers.
Does prepaying need the lender's sign-off every time?
Usually not, for routine part-payments. Net banking or the lender's app handles most of them. Larger amounts and full foreclosures more often need a request or a branch visit, and that varies by lender.
How does a balance transfer compare with prepaying?
They do different jobs. A transfer moves the loan to a lender charging a different rate, which matters most when the gap is wide. Prepaying shrinks the principal itself, whoever holds the loan. You can do both.
Does prepaying affect a later top-up loan?
A smaller balance against the same collateral usually leaves more headroom for a top-up. How much is still the lender's call, under whatever policy it's running at the time.
Does prepaying affect my credit score?
Bureaus don't count paying down debt against you. It registers nothing like a missed payment does.
Can a fixed-rate loan be prepaid without a charge?
Depends on the lender and the loan. RBI's no-charge rules mostly cover floating-rate loans to individuals. Fixed-rate loans are likelier to carry a charge, and it'll be spelled out in the agreement.
What happens to loan insurance on an early foreclosure?
Loan-linked cover is usually tied to the outstanding balance or a fixed term. Whether foreclosing early gets part of the premium back is down to the insurer's terms.
Does this calculator handle a floating rate that resets over time?
No. It holds the rate flat for the rest of the tenure, since there’s no telling where MCLR or repo-linked resets will land. When your rate does change, enter the new rate and balance and the figures follow.
Can NRIs prepay an Indian home loan the same way?
Broadly yes, usually funded from an NRE or NRO account and subject to the lender's process plus RBI/FEMA remittance rules. Enough differs from a resident borrower's route that it's worth confirming with the lender.
How do I model a bonus or windfall?
Enter it as a one-time prepayment in the month it lands, or as a recurring one if it comes every year. The prepay-or-invest comparison then shows both totals for that amount.
Is the "effective loan rate" just the EMI's interest rate?
Not quite. It’s the stated rate adjusted for tax relief you can actually claim on the interest: Section 24(b), old regime, self-occupied only. Under the new regime, or on a let-out property that doesn’t qualify, effective and stated are the same.
What does a small gap between the loan rate and the expected return mean?
That the two totals finish close together, closer than the return assumption is accurate. The calculator reports the figures as they come out rather than picking a winner.
Can I model recurring prepayments, like an annual bonus?
Yes. Set the prepayment type to recurring and you get the amount, the month it starts, and how often it repeats: monthly, quarterly, half-yearly or yearly.
What is a step-up EMI, and does it replace prepaying?
It lifts your EMI by a fixed percentage each year rather than putting a lump sum against the principal. It doesn't replace prepaying. Turn both on and the step-up applies on top of the lump sum, with every figure on the page reflecting the pair.
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