Auto-sweep and flexi deposits: earning FD interest on a savings account

How a sweep works

You set a threshold balance with your bank, say ₹25,000. Whenever your savings balance goes above that threshold by more than a minimum amount, the bank sweeps the surplus into a fixed deposit linked to your account, often in fixed units such as ₹1,000 or ₹5,000. That linked FD earns the FD rate for its tenure.

When a payment, withdrawal or cheque needs more money than your savings balance holds, the bank breaks just enough of the linked FD to cover it and moves the money back. This reverse sweep happens automatically, so the payment goes through as if the money had been in the savings account all along.

A worked example

Say your threshold is ₹25,000 and your salary lifts your balance to ₹1,25,000. The bank sweeps ₹1,00,000 into a linked FD. Two weeks later you pay ₹40,000 for school fees. Your savings balance of ₹25,000 is not enough, so the bank breaks ₹15,000 of the FD, in units, and completes the payment. The remaining ₹85,000 keeps earning FD interest.

The broken part usually earns interest for the time it stayed in the FD, often at the rate applicable to that shorter period, which may be lower than the original rate. Banks commonly break the most recently created deposits first, which keeps older ones intact and limits the interest you lose.

What it is called at different banks

The same idea goes by several names: auto-sweep, sweep-in FD, flexi deposit, money multiplier, two-in-one account, or a linked fixed deposit. The rules differ by bank: the threshold, the size of each unit, the tenure of the linked FD, which deposits are broken first and whether any interest penalty applies. Read your bank's terms before switching it on.

Costs and catches to check

• Interest on broken units may be lower than the FD rate you expected, and some banks apply a small premature withdrawal penalty.
• Very short holding periods may earn little or nothing extra if the money is swept in and out within days.
• FD interest is taxable at your slab rate, like any FD, and counts towards TDS thresholds, unlike savings interest.
• Some accounts need a higher minimum balance to offer sweep, which can cost more than the extra interest earns.
• Linked FDs created by sweeps can be many small deposits, which makes your statement look busier.

Is your money still insured?

Yes, within the usual limits. Swept FDs are bank deposits, so they are covered by DICGC deposit insurance together with your savings balance and any other deposits in the same bank, up to the overall limit per depositor per bank. Spreading large sums across banks is the way to keep more of it covered.

Who should use sweep

• People who keep a large buffer in their savings account month after month, such as an emergency fund or money waiting for a planned expense.
• Self-employed people and small businesses with uneven inflows who want idle money to earn more without losing access.
• Anyone who forgets to move money into FDs by hand.

Who may not need it

If your balance rarely rises much above your monthly spending, sweep will hardly ever trigger, and a regular savings account is simpler. If you are saving for something years away, a regular FD or another option that matches the goal is cleaner than a stream of small linked deposits.

Sweep vs a high-interest savings account

Some savings accounts, often at small finance banks or digital banks, pay higher interest on larger balances without any sweep. Compare the effective return on your typical balance under each option, along with the bank's safety, minimum balance rules and service. A higher savings rate with no sweep can be simpler than a sweep at a bank with a low savings rate.

How to switch it on

Most banks let you enable sweep from net banking or the mobile app under deposits or account services, and some require a branch request. You usually choose the threshold, the size of each sweep unit and the tenure of the linked FD. Start with a threshold that covers a month of regular spending, so that ordinary bills are paid from the savings balance and only larger payments trigger a reverse sweep.

After it is running, check the linked deposits section of your statement or app from time to time. You will see each swept deposit with its amount, rate and maturity date. At the end of the year, look at the interest certificate: the interest from swept FDs appears as FD interest, which you will need when filing your tax return.

Quick answers

Do I need to do anything when I spend? No. The reverse sweep happens automatically when a payment needs the money.

Can I set the threshold myself? Usually yes, within limits the bank sets, at the time you enable the facility or later.

Is sweep the same as a fixed deposit? The swept money sits in fixed deposits, so it earns FD interest and is taxed like FD interest, but you do not choose or manage each deposit yourself.

Does sweep affect my minimum balance? The threshold usually stays in savings, so set it at or above your account's minimum balance requirement.

The bottom line

Auto-sweep is a simple way to earn more on money you keep in reserve without giving up easy access. Read your bank's sweep terms, set a sensible threshold, and remember the interest is taxed as FD interest. This guide is general information, not personal financial advice.