Home loan prepayment savings.
Interest saved
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Why a prepayment punches above its weight
A home loan front-loads its interest. In the early years, the bulk of every EMI goes to interest and only a sliver chips at the principal. That is the whole reason a prepayment is so powerful: a rupee you put down today does not just reduce your balance by a rupee, it cancels all the future interest that rupee would have attracted across the remaining term. The earlier in the loan you prepay, the more compounding interest you erase. The same lump sum prepaid in year two saves far more than prepaid in year twelve.
This calculator keeps your EMI unchanged after the prepayment and lets the loan finish early instead. That is the option I usually favour, because it shortens your debt and locks in the saving, whereas reducing the EMI keeps you in debt for the full term and tends to feel like the money simply evaporated.
How the saving is computed
The tool derives your current EMI from the outstanding balance, rate, and months remaining, then amortises the loan twice month by month: once on the original balance, and once on the balance after your lump sum is knocked off. It adds up the interest in each path. The difference is your interest saved, and the difference in the number of months to clear the loan is your tenure reduction. Because it walks the actual amortisation schedule rather than using a shortcut, the figures reflect how the loan really behaves.
A worked example: a Rs 5 lakh prepayment
Take an outstanding balance of Rs 40 lakh at 8.5 percent, with 180 months (15 years) left to run, and you prepay a lump sum of Rs 5 lakh while keeping the EMI the same.
| Measure | Value |
|---|---|
| EMI on Rs 40 lakh at 8.5 percent for 15 years | Rs 39,390 |
| Total interest with no prepayment | Rs 30,90,125 |
| Total interest after the Rs 5 lakh prepayment | Rs 20,39,416 |
| Interest saved | Rs 10,50,708 |
| Tenure cut | About 40 months, roughly 3.3 years |
This is the figure that startles people. A one-time Rs 5 lakh prepayment saves over Rs 10.5 lakh in interest, more than double the amount you put in, and ends the loan more than three years early. That is the magic of attacking the principal while the interest meter is still running fast.
No penalty on a floating-rate loan
The RBI bars lenders from charging any prepayment or foreclosure penalty on floating-rate home loans taken by individuals. So if your loan is on a floating rate, which most home loans are, you can prepay any amount, any number of times, for free. Fixed-rate loans are different and may carry a charge of around 2 to 4 percent of the prepaid amount, so check your sanction letter. If you are on a fixed rate with a stiff penalty, the saving has to clear that hurdle before prepaying makes sense.
Prepay, or invest the lump sum instead
The honest counter-question is whether that Rs 5 lakh could earn more elsewhere. Prepaying gives you a guaranteed, risk-free return equal to your loan rate, 8.5 percent in this case, tax-free in effect. If you can confidently beat 8.5 percent after tax in equity over the long run, the maths can favour investing. But there is a wrinkle: if you claim the Section 24(b) deduction of up to Rs 2 lakh a year on home-loan interest under the old regime, prepaying reduces that deductible interest, so your effective loan cost is lower than the headline rate. Under the new regime there is no such deduction on a self-occupied home, which tilts the balance toward prepaying. My own bias is that for most people the certainty and the emotional weight off your shoulders make early prepayment worthwhile, especially in the first half of the loan.
Is it better to reduce my EMI or my tenure?
Reducing the tenure almost always saves more interest, because you keep paying the same EMI and simply finish sooner, so more of each payment attacks the principal. Reducing the EMI lowers your monthly outflow but keeps you in debt for the full original term, which costs more interest overall. Choose tenure reduction unless your monthly budget genuinely needs the lower EMI.
Should I make small prepayments or wait for one big lump sum?
Do not wait. Because of front-loaded interest, small and frequent prepayments made early beat a large one made years later. Even one extra EMI a year, or rounding your EMI up, compounds into a meaningful saving and a shorter loan. The best time to prepay a home loan is as early as you can afford it.