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Should you prepay your home loan or invest the surplus instead? It’s one of the most asked questions in HENRY finances. The math says equity wins. The math is incomplete.
The straight math comparison
A typical home loan rate today is around 8.5 to 9%. After tax benefit on the interest deduction, the effective rate drops to around 6 to 6.5% for most HENRYs.
Equity mutual funds have averaged around 12 to 13% over long periods. After tax, around 11%.
Pure return arithmetic says invest the surplus. The 4 to 5 percentage point spread compounds to lakhs over decades. End of debate, right?
Not quite.
What the math leaves out
The 12 to 13% from equity is an average over decades. The actual returns include years of negative or flat performance. The 6.5% from prepayment is guaranteed and immediate.
Risk-adjusted, the comparison narrows. You’re comparing a guaranteed return to an uncertain one. If you account for volatility, equity needs to outperform meaningfully to compensate, not just nominally.
There’s a behavioral angle. Many investors say they’ll invest the surplus, then don’t. The cash sits in savings, gets spent on lifestyle, and the prepayment opportunity is lost without the equity benefit either. Prepayment is forced commitment. Investing requires ongoing discipline.
Tax angle: both sides
Home loan interest is deductible up to ₹2 lakh per year for self-occupied property under Section 24(b). Principal up to ₹1.5 lakh under 80C. So part of the loan cost is subsidized by tax savings.
Equity LTCG is taxed at 12.5% above ₹1.25 lakh per year. So your equity returns lose a chunk to tax.
Net of tax, the spread between equity returns and home loan cost shrinks. Still favors equity, but not as cleanly as the gross comparison suggests.
The behavioural argument for prepayment
Three real benefits of prepayment that pure math misses.
Cash flow improvement. Lower EMI means more monthly liquidity, which can compound into larger SIPs over time.
Psychological freedom. Some people sleep better knowing their loan is shrinking. That stress reduction is real even if it doesn’t show up on a spreadsheet.
Goal sequencing. If owning the house outright is a meaningful life goal, accelerating it has value beyond return optimization.
The behavioural argument against prepayment.
Two real costs.
Liquidity loss. Money paid into the home loan can’t be pulled back without refinancing or selling. Surplus invested in equity can be liquidated for emergencies.
Opportunity cost compounded over decades. The same ₹2 lakh per year, deployed for 25 years, lands at very different end values depending on equity vs prepayment.
A decision framework that works
Step one. Have you maxed out tax-saving investments first? 80C, NPS, PPF. These give guaranteed deductions. Always do these before either prepayment or equity.
Step two. Do you have an emergency fund and adequate insurance? Don’t prepay the loan if you’re underprotected.
Step three. What’s your loan rate? If the effective rate (post-tax) is below 6%, lean toward equity. If it’s above 8%, lean toward prepayment. The middle range is genuinely a wash.
Step four. What’s your behavioural pattern? If you’ve been disciplined about SIPs for years, you’ll likely deploy the surplus well into equity. If you struggle with discipline, prepayment may be the better path because it forces commitment.
Step five. How much loan tenure is left? Early in the loan, prepayment saves more interest because of how amortization works. Late in the loan, equity tends to win cleanly.
A reasonable hybrid approach.
For most HENRYs, splitting the surplus works well. Half toward prepayment, half toward equity SIP. You get some of the guaranteed return, some of the equity upside, and you avoid betting the entire decision on one assumption.
The home loan question doesn’t have a universal right answer. It has a right answer for your math, your discipline, and your peace of mind. Pick the version of the answer you can actually execute over 15 years.
