This is the most common question I get from clients with stable incomes and existing home loans: “I have ₹20,000 extra every month. Should I prepay my home loan or start a new SIP?”
The answer isn’t as straightforward as most advisors make it sound.
The Simple Math
Home Loan Prepayment:
- Loan: ₹50 lakh at 8.5% for 20 years
- Extra monthly payment: ₹20,000
- Result: Loan closes 7.5 years early, ₹18.2 lakh saved in interest
SIP Investment:
- Monthly SIP: ₹20,000 at 12% CAGR for 12.5 years (same period as early closure)
- Result: Corpus of ₹48.7 lakh
The SIP wins on paper: ₹48.7 lakh > ₹18.2 lakh saved.
But wait — this comparison ignores three critical factors.
The Three Factors Nobody Mentions
1. Tax Efficiency
- Home loan principal repayment gives Section 80C deduction (up to ₹1.5L)
- Home loan interest gives Section 24 deduction (up to ₹2L)
- ELSS SIP gives Section 80C deduction
- LTCG on equity above ₹1.25L is taxed at 12.5%
After tax, the SIP advantage narrows significantly.
2. Risk Adjustment
Home loan prepayment gives a guaranteed 8.5% return (interest saved). SIP returns of 12% are expected, not guaranteed. In a bad decade (2008-2018 type), equity might deliver 8-10%.
Risk-adjusted, the gap closes further.
3. Psychological Peace
This is the factor spreadsheets can’t capture. For many families, being debt-free provides peace of mind that compounds into better decision-making across all financial areas.
My Recommendation Framework
| Scenario | Do This |
|---|---|
| Home loan rate > 9% | Prepay aggressively — guaranteed high return |
| Home loan rate 7-9%, stable income | Split 50:50 — prepay some, SIP some |
| Home loan rate < 7% | SIP priority — loan is cheap money |
| Less than 5 years left on loan | Prepay — close it out, move on |
| No emergency fund | Build emergency fund first — before either option |
The Tool That Makes This Easy
We built the Prepay Loan vs SIP smart calculator on FintechGyan specifically for this question. It compares both scenarios side-by-side with your exact numbers.
Try it: FintechGyan Calculators → Smart Calculators tab → “Prepay Loan vs SIP”
This analysis uses current tax rules as of March 2026. Consult your tax advisor for personalised advice.