Arbitrage Funds - The Debt Alternative?

Arbitrage funds are equity-taxed mutual funds that exploit the price difference between the cash market and futures market to generate returns that behave like short-term debt instruments. For investors in the 30% tax bracket, they can deliver meaningfully higher post-tax returns than fixed deposits or short-duration debt funds - but only when used correctly.

If you directly want to skip to the good part - The Tax Advantage

What is an Arbitrage Fund?

An arbitrage fund is a type of mutual fund that seeks to benefit from price differences between the cash (spot) market and the futures market.

Here is a simplified example

• Stock (cash market): ₹1,000

• Futures (1-month): ₹1,010

• Locked-in spread = ₹10 (before costs)

When the futures contract expires, both legs converge to the same price. The fund books the spread as profit. Because both legs are matched, the fund carries almost no directional market risk. Whether the stock goes up, down, or sideways, the spread is already locked.

Where Arbitrage Fund Returns Actually Come From

Most investor-facing materials describe arbitrage returns as "low-risk returns from price differences." That's accurate but thin. Investors who understand the real economics position these funds far more credibly.

1. Cost of Carry / Interest Rates

Futures trade at a premium over spot price because buyers of leveraged positions pay a financing cost. Higher interest rates → higher spreads → better arbitrage returns

2. Liquidity & Demand for Leverage

When traders and investors want to take leveraged long positions in equities, they buy futures. Higher demand pushes futures premiums up, which creates better opportunities for arbitrage funds. Bull market phases with high retail participation tend to produce better arbitrage returns.

3. Short Term Market Volatility

Counterintuitively, volatility spikes can briefly widen spreads. Calm, directionless markets compress them.

Arbitrage fund returns are not "equity returns", nor are they guaranteed like FD returns. They track short-term interest rates more closely than anything else. 

Why Investors Use Arbitrage Funds as a Debt Alternative

1. Generating income for expenses (especially retirees)

The post-tax yield advantage over FDs is significant for high-bracket investors. More on this below.

2. Systematic Transfer Plans (STPs) into equity

Parking a lump sum in an arbitrage fund before systematically moving it into equity funds gives you near-debt stability while you deploy capital over 12-24 months.

3. Temporary allocation during market uncertainty

When an investor wants to reduce equity exposure but doesn't want to move to full debt, arbitrage funds offer a middle ground with a better tax profile.

The Tax Advantage: Where the Real Edge Lives

Because arbitrage funds maintain 65%+ equity exposure (even though that exposure is fully hedged), they are classified as equity funds. That classification carries equity fund taxation:

Feature	Arbitrage Funds	Debt Funds
Holding Period <1 Year	20%	Slab
Holding Period >1 Year	12.5% (above ₹1.25L gains)	Slab

For investors in the 30% tax slab, this creates a meaningful post-tax alpha

A Real Numbers Example

In this example, we cover the poast-tax outcomes for three popular debt investment avenues. We assume an initial investment of ₹50 lakhs.

	Arbitrage Fund with  SWP	Fixed Deposit	Debt Fund with SWP
Amount Invested	50,00,000	50,00,000	50,00,000
Return Expectations *	6.00%	6.75%	6.50%
Pre-Tax Returns	3,00,000	3,00,000	3,00,000
Tax rate**	12.50%	30%	30%
Post-Tax Return ***	2,62,245	2,36,250	2,27,500
Additional Return in Arbitrage Funds		25,995	34,745

*Return expectations for arbitrage funds based on 3 and 5 year returns of our top 3 ranked funds. We have adjusted this downwards to reflect the higher STT applicable as per the recent Union Budget.

For debt funds, return expectations are based 3 and 5 year returns of our top 3 ranked medium to long duration and corporate bond funds.

**Assumes no tax gain harvesting, no cess or surcharge. *** For SWP options, tax amount varies each year. We have ignored the time value of money benefit (since majority liability will be in later years).

The arbitrage fund delivers ~₹26k and ~₹35k more in post-tax income annually than Fixed Deposits and Debt Mutual Funds.

But this advantage only exists at higher tax slabs (>25%). Thus, arbitrage funds are favourable for investors who sit in the higher tax slabs, while Fixed Deposits may be favourable for investors in the lower tax slabs.

The SWP Advantage

Arbitrage Funds and Debt Mutual Funds offer the Systematic Withdrawal Plan (SWP) option, which defers taxation to later years.

With Fixed Deposits, interest gets taxed every year - the tax outgo is immediate and unavoidable. However, with mutual funds (through SWP), only the 'capital gain' portion of withdrawals is taxed. Thus, tax liability gets deferred and is concentrated in the later years over multiple years. For certain investors, this can significantly improve cash flow efficiency.

Further, pre-mature withdrawal in Fixed Deposits attracts penal charges of 0.5% to 1%, but for arbitrage funds, the exit load is ~0.25% (for withdrawal within 3-6 months).

Key Risks with Arbitrage Funds

1. Returns Are Variable, Not “Fixed”

Arbitrage fund returns fluctuate. A fund that returned 6.5% last year might return 4.8% next year if rate spreads compress. FD investors who move to arbitrage funds without understanding this sometimes feel misled.

2. Spread Compression Risk

Arbitrage funds earn from cash - futures spreads, which are linked to short-term interest rates and demand for leverage. Excess liquidity in system, low interest rates and reduced F&O demand can cause spreads to shrink and returns to fall – thereby breaking the ‘debt-like’ impression investors have.

3. Liquidity & Risk

Arbitrage relies on simultaneous execution in cash and futures markets, and tight bid-ask spreads. During times of low liquidity, slippages increase, impact costs become meaningful (specially for large AUM funds) and higher expense ratios can eat into investor returns.

When Should Investors Use Arbitrage Funds?

Ideal Use Cases:

• High tax bracket clients

• Parking money for medium term

• STP into equity

• Conservative investors who want to avoid duration/credit risk

Avoid When:

• You expected "Fixed" returns like an FD

• Investment horizon <180 days

Arbitrage funds sit in a unique space:

• Structurally equity 

• Behaviourally debt-like 

• Economically linked to short-term interest rates 

  
  

For the right investor profile and right horizon, they can be extremely effective.

Disclaimer

The information provided in this discussion is strictly for educational and informational purposes and does not constitute professional financial, investment, legal, or tax advice. Mutual fund investments are subject to market risks, including the potential loss of principal, and past performance is not a reliable indicator of future results. All specific fund names, historical events, or financial metrics mentioned are for illustrative purposes only and should not be construed as recommendations to buy or sell any security. You are strongly advised to consult with your advisor or a qualified financial planner to assess your specific risk profile, tax bracket, and financial goals before making any investment decisions.