Home Loan Prepayment: ₹5 Lakh Prepay Saves ₹10.6 Lakh

The ₹10 Lakh Question Every Homeowner Asks

Rohit has ₹5 lakh in his savings account earning 3% interest. He also has a ₹50 lakh home loan at 8.5% with 15 years still remaining. His friend says "prepay kar do, big savings." His CA says "invest karo, better returns milenge." Both are right — for different reasons.

Here's the actual math. If Rohit prepays ₹5 lakh in year 5 of his loan, his loan closes 3 years earlier and he saves ₹10.6 lakh in interest. If he invests the same ₹5 lakh in a mutual fund earning 12% for 15 years, he makes ₹15.6 lakh in gains — but pays ₹10.6 lakh extra in home loan interest. Net gain from investing: only ₹5 lakh. And that's before taxes.

This calculator answers the question every homeowner has: prepay or not, and by how much. Enter your loan details and see the exact interest saved.

How to Use This Calculator

The EMI Calculator handles three inputs and shows how prepayment changes the picture.

Loan Amount: The original amount borrowed, not the property price. If the flat cost ₹60 lakh with ₹10 lakh down payment, enter 5000000.

Interest Rate: The annual rate — currently 8.4% to 9.5% across SBI, HDFC, ICICI for home loans. Enter 8.5, not 0.085.

Tenure: Enter in months, not years. A 20-year loan is 240 months. Most users type 20 and get an EMI that's wrong by a factor of 20 — ₹8.5 lakh instead of ₹43,391.

The output shows Monthly EMI, Total Interest, and Total Payment. Most users focus on the EMI and skip total interest — but that's where the real story is. On a ₹50 lakh, 20-year loan, you pay ₹54.14 lakh in interest — more than the loan amount itself. Prepayment changes this dramatically.

The Prepayment Formula — Why Timing Matters

Home loan interest works on a reducing balance. In year 1, roughly 80% of every EMI goes toward interest and only 20% toward principal. By year 15, this flips — 80% goes toward principal and 20% toward interest.

This is why prepayment saves more when done early. A ₹5 lakh prepayment in year 2 reduces your outstanding balance when interest is being charged at its maximum. The same ₹5 lakh prepayment in year 15 saves almost nothing because most of the interest has already been paid.

The formula for outstanding balance after "p" EMIs paid:

Outstanding = P × [(1+r)^N − (1+r)^p] ÷ [(1+r)^N − 1]

Where P is principal, r is monthly rate (annual ÷ 12 ÷ 100), N is total months, and p is months already paid. Your new loan tenure after prepayment is the number of months it takes to close the reduced balance at the same EMI.

The mistake users make is comparing "prepay saves X" vs "invest earns Y" using headline returns. If prepayment saves 8.5% guaranteed and mutual funds earn 12% pre-tax (10.5% post-tax), the real difference is only 2 percentage points — much smaller than headline numbers suggest.

Real Examples at Different Scales

Example 1 — Small prepay, ₹50,000 in year 2
Loan: ₹30 lakh at 8.5% for 20 years. EMI ₹26,035. Outstanding after 24 EMIs: ₹28.7 lakh. Prepay ₹50,000 → outstanding ₹28.2 lakh. Same EMI → loan closes 5 months earlier. Interest saved: ₹1.14 lakh.
Small amount, meaningful saving. This is why even ₹50,000 prepayments matter early in the loan.

Example 2 — Mid-range prepay, ₹2 lakh in year 3
Loan: ₹60 lakh at 8.75% for 25 years. EMI ₹49,290. Outstanding after 36 EMIs: ₹58.1 lakh. Prepay ₹2 lakh → outstanding ₹56.1 lakh. Same EMI → loan closes 11 months earlier. Interest saved: ₹5.5 lakh.
Effectively, ₹2 lakh prepayment earned you ₹5.5 lakh over the loan's remaining tenure. That's a 175% return — impossible to match with any investment at zero risk.

Example 3 — Large prepay, ₹5 lakh in year 5
Loan: ₹50 lakh at 8.5% for 20 years. EMI ₹43,391. Outstanding after 60 EMIs: ₹44.06 lakh. Prepay ₹5 lakh → outstanding ₹39.06 lakh. Same EMI → loan closes in 144 months instead of 180. Loan closes 3 years earlier. Interest saved: ₹10.62 lakh.

Example 4 — ₹10 lakh prepay, but in year 12
Same loan: ₹50 lakh at 8.5% for 20 years. But prepay ₹10 lakh in year 12 instead of year 5. Outstanding after 144 EMIs: ₹24.5 lakh. Prepay ₹10 lakh → ₹14.5 lakh. Loan closes 4 years earlier. Interest saved: ₹4.8 lakh.
Same ₹10 lakh, but saves ₹5.8 lakh less than if prepaid in year 5. This shows why timing is more important than amount. Early prepayments do the heavy lifting.

Common Mistakes in Prepayment Planning

• Choosing EMI reduction over tenure reduction. When you prepay, most banks ask: reduce EMI or reduce tenure? 90% of users pick EMI reduction because it feels better (lower monthly outgo). But tenure reduction saves 30-40% more interest. Always pick tenure reduction unless cash flow is critical.
• Prepaying with emergency fund. Users often prepay ₹5 lakh from savings that should stay as an emergency fund. If a medical emergency hits next month, you'll take a personal loan at 14% — wiping out all prepayment savings. Keep 6 months of expenses untouched before prepaying.
• Ignoring the tax benefit loss. Home loan interest up to ₹2 lakh is deductible under Section 24(b) in the old regime. If you prepay and close the loan early, you lose this deduction. On a 30% tax slab, that's ₹60,000/year in lost tax savings. Factor this into the actual return calculation.
• Comparing prepayment to gross investment returns. Users compare 8.5% prepayment saving to 12% mutual fund return and conclude "invest is better." But the mutual fund return is pre-tax and pre-risk. Post-tax and after adjusting for the guaranteed nature of prepayment returns, the difference narrows to 1-2 percentage points — often not worth the market risk.

When Prepayment Doesn't Make Sense

Prepayment isn't always the right answer. Skip it in these cases:

• Loan rate is below 7%. If you have an older loan at 6.5-7% (rare but possible), the effective cost after tax deduction is closer to 5%. You can beat that with an FD at 7%. Invest instead.
• You have no emergency fund. Prepaying and then taking a personal loan for emergencies is a net loss. Build a 6-month fund first.
• You have high-interest debt. Credit card debt at 36-42% or personal loans at 14-18% should always be cleared before home loan prepayment. Highest rate first.
• You're in the last 5 years of your loan. Most of the interest has already been paid. Prepaying now saves almost nothing — the remaining EMIs are mostly principal anyway.

For complex cases (multiple loans, investment portfolio decisions), consult a SEBI-registered advisor. The calculator handles standard scenarios.

Frequently Asked Questions

Does prepayment reduce EMI or tenure?
Both options exist. Most banks default to reducing tenure (keeping EMI same), which saves more interest. Some banks allow EMI reduction instead. When prepaying, always tell the bank explicitly which option you want — reducing tenure usually saves 30-40% more interest than reducing EMI.

Is there a penalty for home loan prepayment?
No. RBI banned prepayment penalties on floating-rate home loans in 2014. If your loan is on a floating rate, you can prepay any amount anytime with zero charges. For fixed-rate loans, some banks charge 2-4% penalty — check your loan agreement.

Should I prepay home loan or invest in mutual funds?
If your home loan rate is 8.5% and expected mutual fund return is 12%, investing gives a 3.5% post-tax advantage — but with market risk. If the loan rate is above 10%, prepayment is usually better because guaranteed 10% return is hard to beat. Compare post-tax returns, not headline rates.

Can I prepay home loan in the first year?
Yes. RBI rules allow prepayment from day one on floating-rate home loans with no penalty. Some banks may have internal guidelines requiring 6-12 months of EMIs before prepayment, but these are not enforceable under RBI rules. Verify with your lender.

How much minimum prepayment is allowed?
Most banks require a minimum prepayment of ₹10,000 to ₹25,000 per transaction. Some banks require it in multiples of ₹1,000. There is no maximum limit. You can prepay any amount up to the total outstanding balance.

Does prepayment affect home loan tax benefits?
Prepayment doesn't affect tax benefits already claimed. But once the loan is fully repaid, Section 24(b) home loan interest deduction (up to ₹2 lakh) and Section 80C principal repayment deduction (up to ₹1.5 lakh) stop applying. Factor this in if you're in the old tax regime.

Run Your Own Numbers

The math on prepayment isn't obvious. A ₹5 lakh prepayment in year 5 doesn't look dramatic in isolation — but ₹10.62 lakh in interest savings is real money. And early prepayments do 2-3x the work of late ones.

Before you decide, put your actual loan amount, rate, and tenure into the calculator. Then compare against your investment options. The answer will be obvious once you see the numbers.

Related reading: Old vs New Tax Regime Guide · Loan Eligibility Calculator

Last updated: 21 September 2026