When Home Loan Prepayment Beats Investing Your Bonus Cash

When a salary bonus or annual increment lands in the bank account, the home loan is still there with years of interest ahead of it. The choice is binary. Put the surplus into the outstanding principal, or move it into equities and mutual funds, betting the return beats the borrowing cost. The answer starts with the loan's interest rate and ends with the post-tax return the cash can realistically earn.

Atul Monga, CEO and co-founder of BASIC Home Loan, frames the decision as a direct comparison: what the loan costs versus "the post-tax returns that the funds can generate elsewhere." If the surplus earns less than the loan costs and the borrower is still early in the cycle, prepayment can be the better option, he said.

Home loan interest is calculated on the outstanding principal, which is why timing dominates the math. A prepayment in the first years of the tenure removes the base on which future interest accrues; the same payment made halfway through the loan removes far less. Borrowers who reduce the principal early also get a second choice: shorten the tenure, or cut the equated monthly instalment and keep the tenure as it is. Tenure reduction maximizes the interest saved; an EMI cut frees monthly cash flow. The choice follows long-term family responsibilities and cash-flow objectives, not which option looks better on paper.

The default target, on home as well as personal loans, is to reach debt-free status as soon as possible. Prepayment serves that target; so does a higher EMI. The prepayment route works best when the surplus arrives early, because that is when the outstanding principal is largest and the interest on it has the longest run ahead.

The trap is over-deploying every rupee of surplus.