Liquid ETF: How Overnight-Rate ETFs Park Idle Cash in a Demat Account

Sell a stock on a Monday and the money lands in your trading account, where it usually just sits, earning nothing, while you wait for the next idea. A liquid ETF is one way traders put that idle cash to work for a few days or weeks without leaving the demat account. It is a boring product. That is exactly the point.

This piece walks through what the overnight-rate ETFs listed on NSE actually hold, how their returns are worked out, why the best-known one keeps its NAV pinned near ₹1,000, and the small but annoying detail of fractional units. We’ll lean on the scheme documents themselves rather than broker marketing.

What a liquid ETF holds

The common Indian liquid ETFs track the Nifty 1D Rate Index. NSE Indices describes the overnight market as one of the most active parts of India’s money market, and says the index measures the return earned by participants who lend money overnight. The rate it uses comes from the Triparty Repo Dealing System, or TREPS.

In plain words: the fund lends cash overnight against government securities or treasury bills as collateral, gets it back the next working day with interest, and does it all over again. The scheme information document for Nippon India ETF Nifty 1D Rate Liquid BeES (NSE symbol LIQUIDBEES) lays out the limits. It puts 95% to 100% of assets in tri-party repo on government securities or T-bills, or in repo and reverse repo, and up to 5% in other money market instruments, including cash and cash equivalents. It also says it will only buy instruments with a maturity of up to 91 days.

The same document lists the index’s constituent as on September 30, 2025 as TREPS, with a 100% weight. No stocks, no corporate bonds, and nothing long-dated that swings when interest rates move. The scheme itself is labelled as carrying relatively low interest rate risk and relatively low credit risk.

How the Nifty 1D Rate Index earns its return

The index arithmetic is simple enough to do on a phone calculator. Going by the methodology in the NSE Indices factsheet:

• It takes the annualised weighted average TREPS rate that CCIL (Clearing Corporation of India) publishes at the end of the day.
• It divides that annual rate by 365 to get a daily rate.
• It adds that day’s interest to the previous index value.
• It uses TREPS with T+0 settlement.
• If the next day is a working day, it uses the one-day rate. If the next day is a holiday or a Saturday, it uses the rate for “n” days, where n is the number of days until the next working day.

The index started on a base date of January 3, 2011 with a base value of 1,000, and it is calculated once, at the end of each day.

Worked example: one ordinary day, one Friday

These numbers are hypothetical, picked only to show the mechanics. Say the index is at 1,000 and the overnight TREPS rate is 6.00% a year.

• Daily interest = 1,000 × 6 ÷ 36,500 = 0.1644 (rounded).
• Next working day’s index = 1,000.1644.
• On a Friday the money is out until Monday, so the three-day rate is used: 1,000 × 6 × 3 ÷ 36,500 = 0.4932. The index moves to 1,000.4932 for the weekend in one step.

That is the whole engine. There is no price risk in the usual sense, because the “price” of an overnight loan barely changes. What changes is the overnight rate itself, which moves with money market conditions.

A liquid ETF is not trying to beat anything. It is trying to earn the overnight rate on your spare cash, minus its costs, and to let you get out on any trading day.

What the index has actually returned

The NSE Indices factsheet dated September 30, 2026 reports these index returns. The one-year figure is an absolute return; the five-year and since-inception figures are compound annual growth rates:

• One year: 5.24%
• Five years: 5.76% a year
• Since inception: 6.27% a year

Keep in mind that these are index numbers. An ETF tracking the index earns them minus its expenses, and it will also drift slightly from the index because of cash drag and timing. The Liquid BeES document calls this tracking error, which it defines as the annualised standard deviation of the gap between the scheme’s daily NAV returns and the index’s daily returns. Nothing guarantees a fund will hit the index return; every scheme document says so.

Two designs: daily dividend versus growth

Here is where liquid ETFs differ from each other, and it matters for how your holding looks in the demat statement.

The daily-IDCW design (Liquid BeES)

Liquid BeES has a face value of ₹1,000 per unit. Its scheme document says the fund will try to declare an IDCW (income distribution cum capital withdrawal, the new name for dividend) every day, so that the NAV stays at that ₹1,000 face value. It only declares an IDCW when the NAV is above face value, and that IDCW is compulsorily reinvested. The fund adds that the IDCW accrues on Saturdays and Sundays too.

So the unit price hardly moves. What moves is the number of units you hold. The income shows up as extra units.

The growth design

Some newer liquid ETFs skip the dividend completely. The HDFC NIFTY 1D Rate Liquid ETF – Growth document says that scheme offers only a growth option. It tracks the same index and invests in TREPS, but the interest stays inside the fund and the NAV climbs slowly day after day. The face value is also ₹1,000, and your unit count stays fixed.

Which one is better? Neither, really. The growth version keeps the demat statement tidy and avoids a fractional-unit clean-up. The IDCW version keeps the price near a round number. The two pay you in different forms, income units versus a rising NAV, so ask a tax adviser how each would be treated for you before you pick.

The fractional-unit problem

This is the bit that catches people out with Liquid BeES. Nippon India’s note on redeeming fractional units explains that the daily reinvestment produces fractional units, credited to your demat account periodically, up to three decimal places. NSE’s minimum trading lot for the ETF is one unit, so those fractions cannot be sold on the exchange.

Worked example: 100 units for a month

Again, hypothetical numbers. Say you hold 100 units, and the fund earns 5.5% a year after expenses.

• Day one income on ₹1,00,000 = 1,00,000 × 5.5 ÷ 36,500 ≈ ₹15.07, which comes back as about 0.015 units.
• Repeat that for 30 days, with each day’s new units also earning, and you end up with roughly 100.453 units.

You can sell the 100 whole units on NSE any trading day. The 0.453 is stuck unless you use the redemption route.

How to get the fractions out

Nippon India’s note gives two paths:

• Transfer the fractional units to the fund’s CDSL demat account using an off-market delivery instruction slip (intra-depository if your account is with a CDSL participant, inter-depository if it is with NSDL). The fund redeems the fraction and pays the money to the bank account registered with your depository participant.
• Redeem through NSE’s Mutual Fund Service System or BSE’s StAR MF platform.

One detail worth getting right. Only the fraction is redeemed under this facility. The fund’s own example: if you send 1.568 units, it redeems 0.568 and sends the one whole unit back to your account. Before you fill the slip, check the exact account details on the current Nippon document instead of copying them from a forum post.

With the dividend design, the price stays put and your unit count grows. The money is there, but part of it piles up in fractions the exchange won’t let you sell.

Buying and selling on the exchange

For most of us, a liquid ETF is bought and sold exactly like a share, through a broker during market hours. The Liquid BeES document says the units trade on NSE in round lots of one unit, at prices that may be close to, but are not the same as, the NAV. Two practical points follow from that.

First, you pay the market price, not the NAV. If the screen shows a price a little above ₹1,000, that small premium is a cost to you. A limit order, set near the latest NAV, keeps you from overpaying.

Second, liquidity comes from market makers. The HDFC document, for instance, says that fund has appointed at least two market makers to offer buy and sell quotes. Direct dealing with the fund is mainly for market makers and large investors, and only in creation-unit size. For big investors the Nippon document sets the direct-transaction threshold above ₹25 crore.

There is a safety valve for smaller holders. Under the Liquid BeES document, investors other than market makers and large investors can go straight to the fund for redemptions of up to ₹25 crore, without exit load, if any of these happens:

• The closing price is more than 1% below the day-end NAV for 7 trading days in a row.
• No quotes are available on the exchange for 3 trading days in a row.
• The total bid size on the exchange is less than half the creation unit size each day, averaged over 7 consecutive trading days.

What it costs

The Liquid BeES document lists a maximum total expense ratio of up to 1.00% under Regulation 52(6)(b) of the SEBI mutual fund rules. That is a ceiling, not what the fund necessarily charges today; the actual expense ratio is disclosed separately on the fund house’s website. With an index earning around 5% to 6% a year in recent years, every tenth of a percent of cost is a real slice of your return, so check the current TER before buying and compare a couple of schemes.

Add your broker’s charges and the exchange and statutory levies on each trade. For a parking product earning a single-digit yearly rate, frequent in-and-out trades can quietly eat most of what you earn over a few days.

Worked example: parking sale proceeds for a month

Hypothetical case. You sell shares and have ₹2,00,000 you expect to redeploy in about a month. You buy 200 units at roughly ₹1,000.

• At an assumed 5.5% a year net of fund expenses, daily income is about 2,00,000 × 5.5 ÷ 36,500 ≈ ₹30.14.
• Over 30 days that is roughly ₹904 before compounding, a little more with it.
• From that, knock off the buy and sell brokerage, any price premium you paid over NAV, and the statutory charges.

The lesson is the arithmetic. On ₹2 lakh for one month, the gain is in the hundreds of rupees, not thousands. Worth doing if costs are low and the cash would otherwise sit for weeks. Barely worth it for two or three days.

Where liquid ETFs fit, and where they don’t

They make sense for:

• Cash between trades that you want inside the demat account rather than in the bank.
• Short waits, from a few days to a few months, where you care more about getting out quickly than about yield.

They are a poor fit for:

• Long-term savings. Over five years the index compounded at 5.76% a year, which is a cash-like return.
• Emergency funds you may need on a market holiday, since exchange units can only be sold when the market is open.
• Anyone who wants to beat inflation by a wide margin. That is not what this product is built for.

If you are building a broader parking strategy, our explainers on the gold ETF in India and the silver ETF in India show how the same ETF structure works with a very different, far more volatile underlying asset. And if you use holdings as collateral for trading, read our piece on margin pledge on NSE to see how pledging works in general, then check your broker’s list of what it accepts.

A short checklist before you buy

• Is it a daily-IDCW scheme or growth only? Decide whether you mind fractional units.
• What is the current expense ratio, not just the ceiling?
• How wide is the bid-ask spread right now, and how far is the price from the latest NAV?
• How long will the cash really sit? If it’s two days, the costs may wipe out the gain.
• Have you read the scheme information document? It’s long, but the first few pages answer most of the questions above.

A liquid ETF won’t make anyone rich, and that is fine. It is plumbing. Done well, it turns dead cash into a small, steady trickle while you wait for the trade you actually care about.

Disclaimer: This article is for education only and is not investment advice or a recommendation to buy or sell any security or scheme. Worked examples use hypothetical figures. Mutual fund investments are subject to market risks; read all scheme-related documents carefully and consult a SEBI-registered adviser before investing.