Home Loan Prepayment Calculator — Discovery Document

JTBD

“Should I prepay my home loan or invest that money?”

Prepayment Types

Part-prepayment (lump sum): One-time or periodic payment reducing outstanding principal. Banks typically reduce tenure by default, though some allow choosing EMI reduction.
Full foreclosure: Paying off the entire remaining loan balance in one shot.

RBI Regulations

Floating-rate home loans for individuals: NO prepayment penalty allowed (RBI circular DNBS.CC.PD.No. 266/03.10.01/2012-13, effective since 2014). This covers the vast majority of home loans in India.
Fixed-rate home loans: Banks MAY charge a penalty of 2-4% on the prepaid amount. Check your loan agreement.
Non-individual borrowers: Penalties may apply regardless of rate type.

Tax Implications (FY 2025-26)

Section 24(b) — Interest Deduction

Up to ₹2,00,000 deduction on home loan interest for self-occupied property
Available ONLY under OLD tax regime (not available in new regime)
For let-out/rented property: entire interest is deductible (no cap) under old regime
After prepayment, total interest paid reduces, so the deduction benefit also reduces

Section 80C — Principal Repayment

Up to ₹1,50,000 deduction on principal repaid (including prepayment)
Also OLD regime only
Shares limit with other 80C instruments (PPF, ELSS, EPF, etc.)
Prepayment amount can be claimed under 80C in the year of payment

Effective Cost of Home Loan (Old Regime)

At 8.5% interest, 30% tax slab: effective cost = 8.5% × (1 - 0.30) = ~5.95%
At 9.0% interest, 30% tax slab: effective cost = ~6.30%
This only applies if borrower claims Section 24(b) deduction under old regime
Under new regime: no deduction, effective cost = nominal rate

Prepay vs Invest Analysis

Option A: Prepay Home Loan

Guaranteed return equal to loan interest rate (8.5-9.5%)
Risk-free — no market volatility
After Section 24(b) under old regime: effective return drops to ~6-7%
Psychological benefit of being debt-free

Option B: Invest in Equity (SIP/Mutual Fund)

Historical NIFTY 50 CAGR: ~12% over 10+ years
Not guaranteed — significant short-term volatility
LTCG tax at 12.5% on gains above ₹1.25L/year
Post-tax effective return: ~10-10.5% for long-term
Requires discipline to stay invested through market cycles

Option C: Fixed Deposit

Current FD rates: ~7-7.5% for major banks (FY 2025-26)
Interest taxable at slab rate (up to 30% + cess)
Post-tax return at 30% slab: ~4.9-5.25%
Almost always worse than prepaying the loan

Decision Framework

If NOT claiming Section 24(b) (new regime): Prepaying is almost always better than FD, and competitive with equity on risk-adjusted basis
If CLAIMING Section 24(b) (old regime, 30% slab): Effective loan cost ~6%, equity at ~10% post-tax wins mathematically — but requires risk tolerance
If loan rate > 10%: Prepay first, always
If early in loan tenure: Prepay early for maximum interest savings (amortization is front-loaded with interest)

Optimal Timing

Prepaying early saves more: In a 20-year ₹50L loan at 8.75%, ~60% of total interest is paid in the first 10 years
Start of financial year: Prepay in April-May to reduce interest for the full year
After annual bonus: Most common prepayment pattern in India

Amortization Math

Standard EMI formula: EMI = P × r × (1+r)^n / [(1+r)^n - 1]
After prepayment, new outstanding = old outstanding - prepayment amount
Bank recalculates either: (a) new tenure at same EMI, or (b) new EMI at same tenure

Budget 2025-26 Updates

No changes to Section 24(b) ₹2L limit for self-occupied property
No changes to Section 80C ₹1.5L limit
New tax regime remains default; old regime optional
Standard deduction increased to ₹75,000 in new regime (Budget 2024)
No prepayment penalty rules changed

/in/home-loan-emi-calculator — Calculate EMI for new home loan
/in/emi-calculator — Generic EMI calculator
/in/sip-calculator — Compare SIP returns
/in/ppf-calculator — PPF as alternative safe investment
/in/income-tax-calculator — Tax regime comparison
/in/section-80c-calculator — 80C deduction planning