Home Loan Prepayment vs SIP: Where Should Your Extra Money Go?
The most common personal finance question for Indian homeowners — answered with maths. The break-even rate, when each strategy wins, and the correct approach for most people.
The Core Question
You have ₹20,000/month extra after your EMI. Should you add it as a home loan prepayment or start a ₹20,000/month SIP in equity mutual funds?
The answer depends on three numbers: your home loan interest rate, your tax bracket, and your expected SIP return. Here is the framework.
The Math — ₹50L Home Loan at 9%, ₹20,000/Month Extra
| Strategy | After 10 Years | Net Position |
|---|---|---|
| Prepay ₹20K/month on ₹50L @ 9% loan | Loan closed in ~13 yrs (saves ₹7.2L interest) | Debt-free 7 years early, ₹7.2L saved |
| SIP ₹20K/month @ 12% for 10 years | SIP corpus = ₹46.5L | ₹46.5L corpus, loan still running |
| SIP ₹20K/month @ 10% for 10 years | SIP corpus = ₹41.4L | ₹41.4L corpus, loan still running |
At 9% loan rate and 12% SIP return: SIP wins by ₹39L over 10 years. But this ignores the psychological peace of being debt-free and the tax deductions you lose.
The Break-Even Rate — When Each Strategy Wins
| Scenario | Verdict | Why |
|---|---|---|
| Home loan rate < 7.5% | Invest in SIP | Post-tax SIP return (10%+) comfortably beats loan cost |
| Home loan rate 7.5–8.5% | SIP (lean towards) | SIP return likely higher post-tax, but margin narrower |
| Home loan rate 8.5–9.5% | Do 50/50 | Break-even zone — diversify risk |
| Home loan rate > 9.5% | Prepay first | Guaranteed 9.5% return by prepaying beats uncertain SIP |
| Personal/top-up loan at 12–14% | Prepay always | No SIP reliably beats 12%+ guaranteed savings |
Tax Deductions — The Factor Most People Miss
Under the old tax regime, a home loan gives two deductions:
- Section 80C: Principal repayment up to ₹1.5L/year (shared with PF, ELSS, PPF).
- Section 24(b): Interest paid up to ₹2L/year (self-occupied property).
At 30% bracket: ₹2L interest deduction saves ₹62,400/year in tax. This means a 9% home loan effectively costs only 9% × (1 − 30%) = 6.3% post-tax. At this effective rate, almost any equity SIP outperforms prepayment.
Under the new tax regime, neither deduction is available. So the full 9% is your real cost — and the case for prepayment is stronger.
The Recommended Approach for Most Indians
- First 5 years of loan: Build an emergency fund (6 months expenses in FD). Do not put everything into prepayment or SIP without this buffer.
- Home loan rate ≤ 8.5%: Invest extra in SIP. Review every 2 years.
- Home loan rate > 9%: Prepay one extra EMI per year + invest remaining in SIP.
- 10 years before retirement: Shift focus to prepaying — being debt-free at retirement reduces risk significantly.
- If interest rate crosses 10%: Aggressively prepay. The guaranteed 10% return from debt reduction beats uncertain SIP over short horizons.
The hybrid approach: Use your 13th month bonus entirely for home loan prepayment. Invest monthly salary surplus entirely in SIP. This splits the psychologically distinct decisions — regular savings go to SIP, windfalls go to debt. Most people find this easier to execute than constantly re-evaluating the split.
Use the Home Loan EMI Calculator and SIP Calculator to model your exact numbers.
Use These Calculators
Sources: Income Tax Dept of India, Reserve Bank of India, AMFI India, SEBI. All content is for educational purposes only — not financial advice. Last updated: 18 May 2025.