Prepaying a loan, and which lever to pull
Why an early prepayment saves several times what a late one does, whether to cut the tenure or the EMI, and when investing the money instead is the better answer.
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In short
- A prepayment goes entirely to principal and removes the interest that principal would have generated for every remaining month.
- ₹5 lakh prepaid in year two of a 20-year ₹50 lakh loan at 8.5% saves ₹14.57 lakh of interest. The same amount in year fifteen saves ₹2.22 lakh.
- Reducing the tenure saves far more than reducing the EMI. Choose tenure unless cash flow is the binding problem.
- Floating-rate home loans to individuals cannot carry a prepayment penalty in India. Fixed-rate loans can, at 2% to 3%.
- Prepaying beats investing whenever the loan rate exceeds your reliable post-tax return, which at 8.5% is a high bar.
A prepayment is any amount paid beyond the scheduled EMI. Because the EMI already covers the interest due, every rupee of a prepayment reduces the principal directly — and with it, the interest charged on that principal for every month remaining.
That last clause is why timing dominates everything else about prepayment.
Timing is the whole thing
The EMI itself never changes when you prepay and keep the term shorter; what changes is how fast the balance falls. Month by month:
interest = balance × annual rate ÷ 1200
balance = balance + interest - EMI - any extra paid this month
and the loan ends the month the balance reaches zero. The EMI comes from the standard formula, EMI = P × r × (1 + r)^n ÷ ((1 + r)^n − 1), with r the monthly rate and n the number of months.
On a ₹50,00,000 loan at 8.5% over 20 years, EMI ₹43,391, a single ₹5,00,000 prepayment:
| Made in | Interest saved | Tenure cut by |
|---|---|---|
| Year 1 | ₹16,03,691 | 48 months |
| Year 2 | ₹14,57,301 | 45 months |
| Year 5 | ₹10,69,153 | 36 months |
| Year 10 | ₹5,71,382 | 24 months |
| Year 15 | ₹2,22,182 | 16 months |
| Year 18 | ₹67,374 | 13 months |
The same ₹5 lakh saves six and a half times as much in year two as in year fifteen, and more than twenty times as much as in year eighteen. Nothing about the money changed; only the number of months of interest it removed.
The reason is that a prepayment removes the future interest on that principal. In year two there are 216 months of it left. In year eighteen there are 24.
This is the argument for prepaying as early as you possibly can, and it applies with equal force to small amounts. ₹50,000 in year one is worth more than ₹1,50,000 in year fifteen.
Tenure or EMI
Every prepayment forces a choice, and lenders default to the less useful one.
Reduce the tenure, keeping the EMI unchanged. Maximum interest saved. Your monthly outgoing does not change, and the loan simply ends earlier.
Reduce the EMI, keeping the tenure unchanged. Lower monthly payment, far less interest saved.
On the ₹5 lakh prepayment in year two:
| Choice | Interest saved | Effect |
|---|---|---|
| Reduce tenure | ₹14,57,301 | Loan ends 45 months early |
| Reduce EMI | ₹4,77,894 | EMI falls by ₹4,527 |
Three times the saving for choosing the option that costs nothing extra each month.
Choose tenure reduction unless the monthly payment is genuinely unaffordable. Many lenders apply EMI reduction by default and require a written instruction for tenure reduction — ask explicitly, and check the revised schedule afterwards.
Regular small prepayments
A single lump sum is not the only route, and the alternatives are frequently easier to sustain.
One extra EMI a year. Thirteen payments instead of twelve. On the loan above, that cuts the tenure from 240 months to 201 — three years and three months — and saves ₹10,29,139.
Raise the EMI by 5% each year, in line with income. Comparable effect, and it never feels like a sacrifice because the increase tracks the raise.
Round the EMI up. ₹43,391 becomes ₹45,000. ₹1,609 a month is barely noticeable, ends the loan twenty months early and saves ₹5,53,410.
All three exploit the same property: extra money applied early, repeatedly, while the balance is still large.
The charges
In India, floating-rate loans to individuals for non-business purposes cannot carry a prepayment or foreclosure charge. This is an RBI direction and it covers home loans and most personal loans to individuals.
Fixed-rate loans can, typically 2% to 3% of the amount prepaid, and business loans generally can too. Check the sanction letter rather than the marketing material.
Some lenders impose conditions that are not charges but function as friction: a minimum prepayment amount, a limit on the number per year, a lock-in of six to twelve instalments, or a requirement to visit a branch. None of these is prohibited.
Where a charge does apply, compute whether it is worth paying. A 2% charge on ₹5 lakh is ₹10,000 against ₹14.6 lakh of interest saved in year two — obviously worth it. In year eighteen it is ₹10,000 against ₹67,374, which is still worth doing but no longer obviously so.
Prepay or invest?
The comparison is between the loan rate and a reliable post-tax return, and the word doing the work is "reliable".
Prepaying at 8.5% is a guaranteed, risk-free, tax-free 8.5% return. To beat it you need an investment returning more than 8.5% after tax, with certainty.
| Alternative | Typical return | Post-tax at 30% | Beats an 8.5% loan? |
|---|---|---|---|
| Fixed deposit | 7.0% | 4.9% | No |
| Debt fund | 7.5% | 5.3% | No |
| PPF | 7.1% | 7.1% | No |
| Equity, long run | 12.0% | 10.8% | On average, over long periods |
Only equity clears the bar, and only on average and over a long horizon. Equity over five years can be negative; the loan saving cannot.
A reasonable resolution: prepay when the loan rate is high or your horizon is short, invest when the rate is low and the horizon is long, and do some of each where you are unsure. The certainty of the saving has real value that a spreadsheet comparison of expected returns ignores.
Order of priority regardless: clear credit card debt at 40% first, then personal loans at 14% to 20%, then build an emergency fund, and only then consider prepaying a home loan at 8.5%. Prepaying a cheap loan while carrying an expensive one is the most common sequencing error.
Before you prepay
Keep the emergency fund intact. Money in a loan cannot be withdrawn. A prepayment that empties the reserve converts the next unexpected expense into new, more expensive debt.
Check the tax position. Under the old regime, home loan interest is deductible up to ₹2,00,000 and prepaying reduces that deduction. Under the new regime there is no deduction, so nothing is lost — which is the position most taxpayers are now in.
Get the revised schedule in writing. After each prepayment, confirm the new outstanding, the new tenure and the new EMI. Errors happen, and they are much easier to correct immediately.
Prepay near the start of a month, before the next interest accrual, so the reduced balance takes effect for the full period.
Where the money for a prepayment comes from
The arithmetic above assumes the money exists. In practice a prepayment competes with everything else, and the sources differ in how sensible they are.
A bonus or annual increment. The best source, because it is money the budget never depended on. Committing half of every bonus to prepayment is a rule that survives contact with real life better than a monthly target.
A maturing deposit. If an FD is paying 7% post-tax 4.9% and the loan costs 8.5%, moving the money is a clear improvement — provided the deposit was not the emergency fund.
Sale of an unused asset. Idle gold, a second vehicle, land held without a plan. All of these earn less than a home loan costs.
Reducing the SIP. The hardest call, and usually the wrong one for a long horizon. Equity over fifteen years has beaten 8.5% comfortably; over three it may not. Match the decision to the time you have.
Borrowing to prepay. Never worth it unless the new rate is materially lower and there is no charge — which is refinancing, not prepayment.
Refinancing, the other lever
Where the rate is the problem rather than the balance, a transfer to another lender can be worth more than a prepayment.
A 1% reduction on a ₹50 lakh loan with 15 years left saves ₹5,35,366 of interest. Against that, the new lender charges a processing fee of 0.5% and there are legal and valuation costs — typically ₹15,000 to ₹40,000 in total.
The test is simple: compute the saving over the remaining tenure and compare it to the total switching cost. Below about ₹10 lakh of remaining balance, or with under five years left, the arithmetic rarely works.
Before switching, ask your existing lender to match. Many will, for a conversion fee far smaller than the cost of moving — which makes the quote from the new lender useful even if you never take it.
What this calculator assumes
- The prepayment is applied entirely to principal on the date you specify.
- A reducing-balance loan at a constant rate for the remaining tenure.
- The tenure-reduction option keeps the EMI unchanged; the EMI-reduction option keeps the tenure unchanged.
- No prepayment charge is applied — add it yourself if your loan is fixed-rate or for business purposes.
- Tax deductions are not modelled, since they depend on your regime and the property's use.