Home Loan: Prepay vs Invest

A household with a housing loan and a surplus faces a recurring choice: apply the surplus to reduce the loan, or apply it to the long-term investment already chosen. Both uses can be responsible. They are not interchangeable. Prepayment reduces a liability and reduces future interest with certainty. Investment in a diversified equity fund or in the Employees’ Provident Fund increases an asset whose future value is not certain. Tax treatment of the housing-loan interest depends on whether the house is self-occupied or let out, and on the regime selected for the year. This article sets out that comparison. It assumes the emergency reserve is complete and that no unsecured balance at a higher rate remains — if either assumption is false, those items come first, as Series 2 described.

The Tax Side of the Housing Loan

Under the default new tax regime for financial year 2025–26, interest on a loan for a self-occupied house is not deducted. Prepayment does not sacrifice a deduction that the household was claiming, because none was available. Under the older regime, interest on a self-occupied house is deductible up to ₹2 lakh a year, inclusive of the prescribed instalment of pre-construction interest, provided construction was completed within the allowed period. Prepayment that reduces interest below that cap reduces the deduction in later years. That reduction is part of the cost of prepaying, not a reason to refuse to prepay in every case.

Interest on a let-out house is deducted in computing income from house property under both regimes. Under the new regime a loss under that head generally cannot be set off against salary. Prepayment of a let-out property loan therefore reduces an interest figure that was sheltering rental income, and may increase the taxable income of that head. The arithmetic should be run for the property, not copied from a self-occupied example.

A Numerical Illustration

Suppose a self-occupied loan carries a floating rate of 8.5 per cent a year, and the household has a surplus of ₹3 lakh. Applied to the loan, that sum saves interest of about ₹25,500 in the following year at the current rate, and a declining amount thereafter as the outstanding principal would have fallen in any event. The saving is contractual.

Applied instead to a diversified equity mandate that the household already holds, the same ₹3 lakh has an unknown value in ten years. It may be more than the interest saved. It may be less in a window in which the money is required. It is also subject to capital-gains tax if it is later redeemed. The illustration is not an argument that 8.5 per cent is always better than equity. It is an argument that the two outcomes should not be placed in the same column as if both were guaranteed.

If the household is on the older regime and is claiming the full ₹2 lakh interest deduction, the effective cost of the loan is lower than 8.5 per cent after tax. The precise effective rate depends on the slab. That is the number to set beside the investment, not the headline rate on the sanction letter.

When Prepayment Is Usually the Better First Use

• The reserve is complete and no unsecured balance remains.
• The household is on the new regime, so no self-occupied interest deduction is being given up.
• Cash flow is tight enough that a lower instalment, or a shorter remaining tenor, would materially improve the single-earner test.
• The household is uncomfortable carrying a large floating-rate liability into retirement, and the loan would otherwise extend into those years.

When the Existing Mandate Is Usually the Better First Use

• The household is on the older regime and would lose a deduction it is actually using, and the surplus is modest relative to the outstanding loan.
• The dated goals (retirement, education) are under-funded relative to the plan already written, and the loan tenor is comfortable on a single-earner test.
• The surplus is small and irregular, so that prepayment fees or operational friction would absorb a material part of it. Small, regular prepayments, where the lender permits them without charge, are a different case.

A mixed rule is often the practical answer: a standing instruction to prepay a fixed sum whenever the lender permits a charge-free reduction, and a standing increase in the systematic plan when salary rises. That rule avoids an annual argument and still recognises both uses.