Arbitrage funds explained: Are they right for short-term corporate investments?

Most businesses parking surplus cash stick to the obvious choices: liquid funds, overnight funds, maybe a fixed deposit. Arbitrage funds rarely make that shortlist, mostly because they sound more complicated than they actually are. Once you understand the mechanics, though, they're worth knowing about specifically for one reason: the tax treatment can meaningfully change the post-tax return on surplus held for a year or more.

What are arbitrage funds?

Arbitrage funds are a category of hybrid mutual fund that generate returns by simultaneously buying a stock in the cash market and selling the same stock in the futures market at a higher price. The fund locks in that price difference, known as the spread, regardless of which direction the stock actually moves. Because the fund holds equal and opposite positions in both markets, the profit in one position offsets any loss in the other, which is what keeps volatility low despite the fund technically investing in equities.

How arbitrage funds actually generate returns

The mechanism is simpler than it sounds. A stock rarely trades at the same price in the cash market and the futures market at any given moment; there's almost always a small spread between the two. Arbitrage funds are built to capture that spread systematically, across many stocks, rather than betting on where any individual stock is headed. The positions are held until the futures contract expires, at which point the cash and futures prices converge, and the fund locks in the difference as profit.

This is why arbitrage funds tend to hold up reasonably well in volatile markets. Since the return comes from the spread itself rather than the direction of the underlying stock, a choppy or uncertain market can actually create more arbitrage opportunities, not fewer.

How safe are arbitrage funds compared to debt funds?

Arbitrage funds carry lower volatility than typical equity funds, since price movements in the underlying stock don't directly affect the locked-in spread. That said, they aren't structurally identical to a liquid or overnight fund. Returns can vary a bit more quarter to quarter depending on how much arbitrage opportunity exists in the market at a given time, and execution risk, the two legs of a trade not closing at exactly the intended prices, is a real, if generally small, factor.

We've covered how debt-oriented options like liquid and overnight funds compare on risk and liquidity here: Best low-risk options to invest idle cash in 2026

The tax advantage: Why arbitrage funds get a second look

This is the part that actually differentiates arbitrage funds from other short-term instruments. Because arbitrage funds maintain at least 65% exposure to equities and equity derivatives, they qualify for equity-oriented taxation rather than debt fund taxation, even though their risk and return profile behaves much closer to a debt instrument.

As per current rules, short-term capital gains on arbitrage funds held under one year are taxed at 20%, while long-term capital gains on units held over one year are taxed at 12.5% on gains above ₹1.25 lakh per financial year, with no indexation benefit. Compare that to debt fund taxation, where all gains since April 2023 are taxed at the investor's applicable slab rate regardless of holding period, and the gap becomes clear for businesses in higher tax brackets holding surplus for a year or more.

Mutual fund investments are subject to market risk. Please read scheme-related documents carefully before investing. Past performance is not indicative of future returns.

Arbitrage funds vs. Liquid funds vs. Corporate bond funds

When arbitrage funds make sense for corporate cash

Arbitrage funds fit best for surplus a business is genuinely comfortable holding for a year or longer, where the equity-style tax treatment has time to actually matter. Businesses in higher tax brackets tend to benefit the most, since the gap between equity-oriented and slab-rate taxation widens as the tax bracket increases. This isn't the cash instrument you might need back in a few weeks; that's still a job for liquid or overnight funds. 

We've laid out how these different instruments fit together in a broader deployment plan here: How to deploy idle cash without compromising liquidity

When arbitrage funds aren't the right fit

If your surplus has a short or uncertain time horizon, arbitrage funds aren't the right tool. Redeeming before the one-year mark pushes gains into short-term capital gains territory at 20%, which erodes much of the tax advantage that makes arbitrage funds attractive in the first place. They're also not ideal during periods of low market volatility, since fewer arbitrage opportunities generally mean thinner spreads and more modest returns.

How to choose an arbitrage fund

A few things worth checking before selecting one:

• Consistency of returns across market cycles, rather than just a strong recent quarter.

• Expense ratio, since arbitrage fund returns are already modest, costs matter more here than in higher-return categories.

• Fund size and liquidity, larger funds generally have more capacity to execute arbitrage trades efficiently across a broad set of stocks.

• AMC track record specifically in hybrid and arbitrage categories, rather than a fund house where this is a minor part of their overall book.

Keeping this in context, not as a standalone decision

Arbitrage funds work best as one piece of a broader cash strategy, not a replacement for liquid or overnight funds covering your shorter-term needs. The right approach usually means splitting surplus by time horizon and tax bracket considerations together, rather than picking a single instrument for all of it.

If figuring out where arbitrage funds fit into your specific cash position isn't something your team has bandwidth to work through, KodoNorth is built to handle it.

FAQs

1. Are arbitrage funds risk-free? 

No. While they carry lower volatility than typical equity funds due to the offsetting cash-futures positions, they aren't risk-free; execution risk and periods of thin arbitrage opportunity can affect returns.

2. How long should I hold an arbitrage fund to get the tax benefit? 

At least one year. Redeeming before that shifts gains into short-term capital gains taxed at 20%, rather than the more favorable long-term rate.

3. Are arbitrage fund returns better than liquid funds? 

It depends on the holding period and tax bracket. Pre-tax returns are often comparable, but the post-tax outcome can favor arbitrage funds for longer holding periods in higher tax brackets.

4. Can a business redeem an arbitrage fund early if it needs the cash unexpectedly? 

Yes, arbitrage funds are open-ended and can generally be redeemed at any time, but doing so before one year means losing the long-term capital gains tax benefit.

5. Do arbitrage funds work well in a stable, low-volatility market? 

Not as well. Arbitrage opportunities tend to shrink when markets are calm, which can mean thinner spreads and more modest returns during those periods.