Home Loan Prepayment Calculator

How Home Loan Prepayment Works

A home loan EMI is split into two parts every month: interest on the outstanding principal, and repayment of a small slice of that principal itself. In the early years of a long-tenure loan, most of each EMI goes toward interest — the principal barely moves. A lump-sum prepayment cuts directly into the outstanding principal, which reduces the interest charged on every EMI for the rest of the loan.

Lenders generally offer two ways to apply a prepayment, and the choice changes the outcome:

• Reduce EMI, keep tenure the same — your monthly outflow drops immediately, but the total interest saved over the life of the loan is lower.
• Reduce tenure, keep EMI the same — your monthly outflow stays unchanged, but you become debt-free sooner and save more interest in absolute terms. This is what the calculator above computes.

Because interest is front-loaded, a prepayment made in year 2 of a 20-year loan saves far more than the same amount prepaid in year 15 — the earlier you prepay, the more interest-bearing principal you remove.

Worked Example

Take a ₹50,00,000 loan at 8.5% p.a. with 180 months (15 years) remaining, where the borrower makes a one-time prepayment of ₹5,00,000 and keeps the EMI unchanged:

The tenure shortens by roughly 32 months (over 2.5 years) and total interest drops by close to ₹10.9 lakh — more than double the prepayment amount itself, purely from interest avoided over the shortened tenure. Enter your own loan's figures in the calculator above for an exact number.

Foreclosure Charges: What the Rules Say

For floating-rate home loans taken by individual borrowers, RBI has directed banks and housing finance companies not to levy foreclosure or prepayment charges, regardless of the source of funds used to prepay. This applies whether you prepay a part of the loan or close it entirely.

Fixed-rate home loans are treated differently — lenders can and often do charge a prepayment penalty (commonly 2–4% of the prepaid amount) on these, since the rule above applies specifically to floating-rate loans. Always check your loan agreement's foreclosure clause before assuming prepayment is free, and confirm the current position with your lender since terms vary by product and loan vintage.

Effect on Your Home Loan Interest Deduction

Home loan interest is eligible for a tax deduction under the Income Tax law, subject to caps that depend on whether the property is self-occupied or let out and which tax regime you've opted for. Prepaying principal reduces the interest you pay in future years, which correspondingly reduces the interest deduction available to you in those years. This doesn't make prepayment a bad idea — the interest saved is real money, while the deduction only offsets a fraction of it at your tax slab rate — but it's worth factoring in in years where the outstanding interest was close to the deduction cap. Speak to a tax advisor if this changes your annual planning materially.

Part-Prepayment vs Full Foreclosure

A part-prepayment reduces the outstanding principal while the loan continues, and you choose whether the benefit shows up as a lower EMI or a shorter tenure. Full foreclosure closes the loan entirely by paying off the remaining outstanding principal in one go, which stops all future interest from accruing. Foreclosure makes sense once you have enough surplus to clear the whole balance and no pressing use for that money elsewhere; a part-prepayment is the more common route for borrowers who have a lump sum — a bonus, maturity proceeds, or savings — but still want the loan (and its ongoing tax-deduction eligibility) to continue.

How Often Can You Prepay?

Most lenders don't cap the number of part-prepayments you can make over the life of a floating-rate home loan, though many set a minimum amount per prepayment — commonly equivalent to a few months' EMI — and some ask for updated documentation if you prepay very frequently. Since RBI's no-penalty rule for floating-rate loans covers repeated prepayments, not just a single lump sum, borrowers who receive periodic surpluses (an annual bonus, for instance) can prepay each time rather than waiting to accumulate one large amount, capturing the interest-saving benefit of early prepayment each time. Confirm your specific lender's minimum-amount and frequency rules before planning around this.

When Prepayment May Not Be the Right Call

Prepayment permanently locks money into the property until you sell or refinance — it isn't liquid the way a savings instrument is. Before prepaying, it's worth confirming you already hold an adequate emergency fund, have no higher-interest debt outstanding (credit cards or personal loans typically cost more than a home loan), and aren't prepaying at the cost of essential insurance or near-term financial goals. A home loan is also one of the lower-cost forms of long-term borrowing available to most individuals, so some borrowers deliberately let it run its full tenure and direct surplus funds elsewhere instead — there's no single right answer, only a comparison specific to your own rate, other obligations, and goals.

Where the Prepayment Money Should Come From

Not all sources of surplus funds are equally suited to prepayment. A year-end bonus, matured fixed deposit, or accumulated savings earning a modest return are reasonable candidates, since redirecting them toward the loan is a straightforward interest-rate comparison. Money that's currently invested and performing well — particularly anything earmarked for a near-term goal, like a child's education or your own retirement corpus — deserves more caution, since liquidating it triggers its own costs (exit loads, capital gains tax, loss of further compounding) that should be weighed against the interest saved, not just the headline prepayment benefit shown by a calculator like this one.

Prepaying via Smaller Recurring Amounts vs One Large Lump Sum

Beyond a single lump-sum prepayment, some borrowers use a step-up approach — making smaller, recurring prepayments (say, once every few months from regular savings) rather than waiting to accumulate one large amount. Since interest is front-loaded, prepaying smaller amounts sooner generally captures more of the interest-saving benefit than waiting years to make one bigger prepayment, even though the total rupees prepaid may end up similar either way:

The right approach depends on when the surplus actually becomes available — if it only exists as a single bonus or maturity payout, that's still a good use of it; the point is not to unnecessarily delay a prepayment once the funds are in hand, since every year of delay reduces how much interest that specific rupee amount ends up saving.

Informing Your Lender After a Prepayment

After making a prepayment, confirm with your lender in writing (or through their app/portal, if available) whether the reduced tenure or reduced EMI has actually been applied to your account, and ask for a revised amortization schedule reflecting the change. It's worth checking this rather than assuming the update happened automatically — occasionally a prepayment gets credited to the account but the revised schedule takes a billing cycle or two to reflect, and confirming the numbers match what you expected avoids surprises later, particularly if you're also relying on the revised interest figures for your own tax-planning estimates for that particular financial year.