Home loan overdraft facility: Here's how you can save interest without locking away surplus cash

Home loan overdraft

• Home loan overdraft cuts interest, keeps surplus funds accessible
• OD facility charges higher interest than standard loans; weigh costs vs benefits
• Best for those with regular surplus cash and low risk appetite

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Most home loan borrowers aim to repay their loans ahead of schedule to reduce interest costs and shorten the loan tenure. Channelling surplus funds into prepayments, however, also means dipping into your savings.

Opting for a home loan overdraft facility linked to your loan account can help lower interest outgo and loan tenure, while still allowing you to withdraw surplus funds parked in the account when you need them.

But there is a catch. Lenders usually charge a slightly higher interest rate on home loans with an overdraft facility than on standard home loans. Borrowers should carefully weigh the costs and benefits to assess whether the potential interest savings from the overdraft account outweigh higher borrowing costs.

What happens after you opt for a home-loan overdraft facility?

Once you choose a home loan with an overdraft facility, the loan account is linked to your savings or current account. Any amount deposited over and above the EMI is treated as a prepayment, which reduces the outstanding loan balance and lowers the interest charged.

However, if you later need this surplus money, you can withdraw it at any time. When you do so, the withdrawn amount is added back to the loan outstanding, which gets rebalanced. As a result, the outstanding loan increases and interest is again calculated on the higher balance, leading to higher interest outgo.

How is interest calculated?

Interest is calculated on a daily reducing balance basis. The bank tracks your account every night and only charges interest on the difference between the total loan and the cash sitting in the overdraft account. While your monthly EMI remains a fixed amount, this facility allows your surplus cash to shrink the interest portion of that payment, forcing a larger share of the instalment to go toward clearing your actual debt.

For instance, Suresh has an Rs 80 lakh loan at 9 percent interest with a fixed EMI of Rs 81,141. If he deposits Rs 10 lakh into his account on February 15, 2026, the bank only charges interest on Rs 70 lakh for that night; if his balance drops to Rs 2 lakh the next day, the bank immediately adjusts to charge interest on Rs 78 lakh. Consequently, when he pays his March 2026 EMI, the total interest for the previous month falls from Rs 60,000 to Rs 59,300, causing his principal repayment to automatically jump from Rs 21,141 to Rs 21,841.

Benefits of a home loan overdraft account

Any surplus you deposit directly lowers the effective loan outstanding, helping you save a substantial amount of interest over time. The parked funds remain accessible; you can withdraw them whenever required, unlike a one-time prepayment.

With interest being charged on a lower balance, a larger part of your EMI goes toward repaying the principal, which shortens the loan tenure and reduces the overall cost of borrowing.

What is the drawback of a home loan overdraft account?

Home loans that offer an overdraft facility usually carry a slightly higher interest rate; typically about 0.10 percent to 0.30 percent more than standard home loans.

From an income tax standpoint, any surplus amount parked in the OD account does not qualify for deductions under Section 80C, since it is not considered a formal prepayment of the loan.

Who should take this facility?

Overdraft-linked home loans are best for individuals who have regular surplus cash flow (such as business owners, self-employed professionals earning variable incomes, or salaried individuals receiving frequent bonuses). These borrowers can easily park their excess funds in their linked savings account to reduce home loan interest costs while maintaining liquidity. This way, they can pay off their loan faster.

Should you take OD or invest that money somewhere else?

Whether you should take a home loan OD or invest the surplus money somewhere else depends on whether the returns on your potential investment (excluding taxes) can frequently exceed your home loan interest rate.

“While home loan OD gives you a guaranteed, risk-free return equivalent to your home interest rate, potential for higher returns on investments over the long term (Mutual Funds, SIPs, etc.) can significantly outpace your home loan interest cost. OD account is best for individuals with low-risk appetite and high-interest-rate loans. It also allows you to deposit surplus funds, reducing the daily loan interest calculation, while keeping your money funds accessible for emergencies,” said Raj Khosla, Founder & Managing Director, MyMoneyMantra.com.

“Investing elsewhere is best suitable for individuals with a long investment horizon, risk takers, and a lower-interest rate loan. If your investment returns are higher than loan interest rate, invest the money. If your loan interest rate is higher than investment returns, consider using an OD account.”