Investment vs Loan Prepayment: Which to Choose?
When you have spare cash, the choice is between prepaying a loan (a guaranteed return equal to the interest rate) or investing it (an expected, but not guaranteed, return). The math looks simple but the risk difference is the part people usually skip.
Worked Comparison: ₹5,00,000 Windfall
| Option | Rate | Nature of Return |
|---|---|---|
| Prepay 9% home loan | 9% p.a. | Guaranteed, tax-free (reduces a known cost) |
| Invest in equity (long-term assumption) | ~12% p.a. | Expected only — can be negative in any given year |
On paper, 12% beats 9%. But the 12% is a long-term average, not a promised outcome — equity markets can be down 20%+ in a single year. The 9% loan-prepayment "return" never varies.
Questions That Actually Decide This
- What's your investment time horizon? Equity outperforming loan-prepayment odds improve the longer you can stay invested (7+ years).
- Is the loan interest tax-deductible? If you're claiming Section 24(b) on a home loan, your after-tax loan cost is lower than the headline rate — improving the case for investing instead.
- Do you already have an emergency fund? Never invest money you might need to prepay an emergency-driven default — an emergency fund comes first, always.
- What are the prepayment terms? Floating-rate loans carry no prepayment penalty for individuals, so there's no cost to changing your mind later.
A Reasonable Middle Ground
Many people split the difference: prepay enough to meaningfully cut tenure/interest, and invest the rest. This avoids betting everything on one assumption about future market returns.