Got a bonus or lump sum lying around? The loan prepayment vs investment calculator tells you, in rupee terms, whether you save more by prepaying your loan or by investing that money instead. No guesswork — just your numbers.

What Is Loan Prepayment vs Investment Calculator?

This tool compares two things you can do with a lump sum: pay down your outstanding home, personal, or car loan early, or invest it in mutual funds, FDs, or any instrument of your choice. It's built for salaried employees, freelancers, small business owners, and NRIs repaying an Indian loan who want a number-backed answer instead of a gut feeling.

The loan prepayment vs investment calculator factors in RBI's prepayment charge rules and the home loan interest deduction you might lose by prepaying — most calculators skip both.

Loan Prepayment vs Investment Calculator Formula (as per RBI Directions, 2025 & Income-tax Act, 2025)

Interest saved by prepayment:

EMI = P × r × (1+r)^n / [(1+r)^n − 1]
Interest saved = Total interest (original tenure) − Total interest (revised tenure after prepayment)

Where P = outstanding principal, r = monthly interest rate, n = remaining months.

Investment side:

Future Value = Lump sum × (1 + return/12)^n
Investment gain = Future Value − Lump sum

Tax adjustment: if you claim home loan interest on a self-occupied property under the old tax regime — Section 24(b) of the Income-tax Act, 1961 for FY 2025-26 filings, renumbered to Section 22(2) of the Income-tax Act, 2025 from Tax Year 2026-27 onward — the ₹2,00,000/year cap stays the same either way. Prepaying lowers the interest you can claim in future years, so the calculator nets this off against your interest savings.

Prepayment charges: under the RBI (Pre-payment Charges on Loans) Directions, 2025 (effective 1 Jan 2026), no foreclosure or prepayment charges apply on floating-rate loans taken by individuals for non-business purposes. Fixed-rate loans may still attract lender-defined charges.

How This Calculator Works

1. Enter your outstanding loan amount, current interest rate, and remaining tenure.
2. Enter the lump sum you're deciding between prepaying and investing.
3. Enter the return you realistically expect if you invested the money instead.
4. Tell it whether you claim the home loan interest deduction, and your tax slab if yes.
5. Hit Calculate — it works out interest saved, tax deduction lost (if any), and investment growth over the same period, then tells you which wins.

Step-by-Step Example Calculation

Rohan has an outstanding home loan of ₹30,00,000 at 8.5% p.a., with 12 years (144 months) left. He gets a ₹5,00,000 bonus and is deciding whether to prepay or invest it in an equity mutual fund expected to return 11% p.a. He's on the old tax regime and in the 30% slab, claiming the home loan interest deduction.

• EMI = ₹33,302/month (unchanged tenure math)
• Original total interest over 144 months ≈ ₹19,95,440
• After prepaying ₹5,00,000, revised principal = ₹25,00,000; loan closes sooner, and revised total interest ≈ ₹12,79,880
• Interest saved ≈ ₹7,15,560
• Tax deduction foregone (30% slab, capped at ₹2,00,000/year × 12 years room) ≈ ₹2,14,670
• Net benefit of prepaying ≈ ₹5,00,890
• Investing ₹5,00,000 at 11% for 144 months → Future value ≈ ₹18,60,490 → Investment gain ≈ ₹13,60,490

In this case, investing beats prepaying by roughly ₹8,59,600 — but that assumes the 11% return actually holds for 12 years, which isn't guaranteed the way loan interest savings are.

Who Should Use Loan Prepayment vs Investment Calculator

• Salaried employees and corporate staff who just received a bonus or increment arrear
• Freelancers and small business owners with irregular but lump-sum income
• NRIs repaying an Indian home loan while investing abroad or in India
• CAs and financial advisors comparing options for clients before year-end tax planning

Latest Rules You Should Know (2026)

• The RBI (Pre-payment Charges on Loans) Directions, 2025 took effect 1 January 2026 — no prepayment or foreclosure charges on floating-rate loans to individuals, regardless of the source of funds or any lock-in period.
• The home loan interest deduction (₹2,00,000/year cap) is available only under the old tax regime for self-occupied property — the new regime, default since AY 2024-25, does not allow this deduction.
• The Income-tax Act, 2025 replaced the 1961 Act on 1 April 2026. Your FY 2025-26 return (filed July 2026) still cites Section 24(b); from Tax Year 2026-27 onward, the same deduction sits under Section 22(2) — the cap and conditions are unchanged, only the section number moved.

Common Mistakes People Make

• Assuming all loans are prepayment-charge-free — the RBI exemption applies to floating-rate loans for individuals, not fixed-rate or business loans.
• Comparing loan interest rate directly against investment return without adjusting for the tax deduction lost on prepayment.
• Using an unrealistic, overly optimistic investment return rate to justify not prepaying.
• Ignoring that loan interest savings are guaranteed, while investment returns are market-linked and can vary.
• Forgetting that reducing tenure instead of EMI changes how much total interest you actually save.
• Quoting "Section 24(b)" on a return filed for Tax Year 2026-27 onward — it's Section 22(2) now, same rule, new address.

FAQs

Is it better to prepay a home loan or invest the money in India? It depends on your loan interest rate vs. realistic investment returns, after adjusting for any home loan interest deduction you'd lose. If your loan rate is high and guaranteed, prepayment is often the safer bet; if your investment return assumption is realistic and higher, investing can win.

Are there charges for prepaying a floating-rate home loan? No. As per the RBI (Pre-payment Charges on Loans) Directions, 2025, effective 1 January 2026, no foreclosure or prepayment charges apply to floating-rate loans taken by individuals for non-business purposes.

Does prepaying my home loan reduce my tax deduction? Yes, if you claim home loan interest (Section 24(b) of the 1961 Act, Section 22(2) of the Income-tax Act, 2025). Lower outstanding principal means lower interest paid in future years, which can reduce the deduction you claim, up to the ₹2,00,000 annual cap under the old regime.

Should I reduce my EMI or my tenure after prepaying? Reducing tenure while keeping EMI the same generally saves more total interest than reducing the EMI and keeping the tenure the same, since less interest accrues over a shorter period.

Does this calculator work for fixed-rate home loans too? Yes, the interest-saving formula works for both rate types, but the RBI's no-prepayment-charge protection applies to floating-rate loans only — fixed-rate loans may still carry lender-defined charges as per their board-approved policy.

Is the home loan interest deduction still called Section 24(b) in 2026? Only for returns covering income up to FY 2025-26. From Tax Year 2026-27 onward, it's Section 22(2) of the Income-tax Act, 2025 — same ₹2,00,000 cap, same old-regime-only condition.

Related Tools on Toolisky

• Old vs New Tax Regime Calculator — check whether this deduction even applies to your regime choice
• Salary Tax Calculator India — work out your tax slab before using this calculator
• Home Loan Tax Benefits FY 2025-26 Guide — full breakdown of Section 24(b), 80C, and 80EEA limits
• Section 24(b) Income Tax Act Guide — detailed rules on claiming home loan interest deduction