Arbitrage Funds vs Liquid Funds for Parking Short-Term Cash

The default advice for parking cash you will need in 3 to 12 months is a liquid fund. It is safe, it redeems fast, and it beats a savings account. Almost nobody stops to ask whether it is the best post-tax option, because “liquid fund” has become a reflex.

For a 30% bracket investor, the reflex is wrong. An arbitrage fund earns roughly the same gross return as a liquid fund but is taxed as an equity fund, and that single accounting fact is worth about 0.7% to 2% extra per year after tax. Nobody markets this because there is no product being sold - it is just a tax quirk sitting in plain sight.

But it is not a free lunch, and it does not win for everyone. The edge depends entirely on your tax bracket and how long you actually hold. Let me show the numbers.

The naive rule of thumb, and where it breaks

The rule of thumb: “Short-term cash goes in a liquid fund.” This is fine advice for a beginner and fine for most people in the 5% or nil bracket. It breaks the moment you are in the 30% slab and holding for a few months or more, because it ignores that liquid fund gains are taxed at your slab rate while arbitrage fund gains are taxed under equity rules.

The two funds are near-identical on the asset side. Both hold very short-dated, low-risk positions and both target returns a little above a savings account. The difference is entirely in how the tax department classifies them.

The gross yields are representative for mid-2026 after the RBI’s rate-cut cycle softened money-market rates; both categories move together. The entire argument below is about the tax column, not the return column.

How arbitrage funds actually earn

Worth a sentence, because “equity fund that behaves like cash” sounds like a contradiction. An arbitrage fund buys a stock in the cash market and simultaneously sells its futures contract at a higher price. That spread is locked in regardless of where the stock goes, so there is no directional equity risk. When the futures contract expires, the spread is captured. The fund does this across dozens of stocks and rolls the positions monthly.

Because 65%+ of the portfolio sits in equity (the cash legs of these hedged pairs), SEBI classifies the fund as equity for taxation. That is the whole trick: an equity-taxed instrument with a near-cash risk profile.

The catch is that the spread depends on market activity. In calm, low-volatility months the cash-futures spread narrows and arbitrage returns dip below liquid funds. Over a full year they roughly match, but month to month arbitrage is lumpier.

The worked example: Rs 10 lakh for 9 months, 30% bracket

Assume Rs 10,00,000 parked for 9 months at a 7% annualised gross return in both funds. Over 9 months that is 7% x 9/12 = 5.25%, so a gross gain of Rs 52,500 in each.

Since 9 months is under 12 months, arbitrage gains are taxed as short-term capital gains (STCG) at 20%. Cess of 4% makes that 20.8%. Liquid fund gains are added to income and taxed at the 30% slab, which with cess is 31.2%.

Liquid fund (slab 30%)
  Gross gain        Rs 52,500
  Tax at 31.2%      Rs 16,380
  Net gain          Rs 36,120
  Post-tax return   3.612% over 9 months  = 4.82% annualised

Arbitrage fund (STCG 20%)
  Gross gain        Rs 52,500
  Tax at 20.8%      Rs 10,920
  Net gain          Rs 41,580
  Post-tax return   4.158% over 9 months  = 5.54% annualised

Same gross return, same risk profile, and arbitrage keeps Rs 5,460 more on a Rs 10 lakh, 9-month parking. That is a 0.72% higher annualised post-tax return purely from tax classification, before you have done anything clever.

Now hold it past 12 months

If you can stretch the horizon to 12 months or more, arbitrage stops being merely better and becomes lopsided. Long-term capital gains on equity are taxed at 12.5%, and the first Rs 1.25 lakh of equity LTCG each financial year is exempt.

Take Rs 10,00,000 held for exactly one year at 7%: gross gain Rs 70,000.

Liquid fund (slab 30%)
  Gross gain        Rs 70,000
  Tax at 31.2%      Rs 21,840
  Net gain          Rs 48,160    = 4.82% post-tax

Arbitrage fund (LTCG 12.5%)
  Gross gain        Rs 70,000
  Less exemption    Rs 1,25,000  (covers the entire gain)
  Taxable LTCG      Rs 0
  Tax               Rs 0
  Net gain          Rs 70,000    = 7.00% post-tax

If this is your only equity LTCG for the year, the Rs 70,000 gain fits entirely inside the Rs 1.25 lakh exemption and you pay zero tax. Post-tax return of 7% versus 4.82% - a 2.18% annualised gap on identical gross returns. Even without the exemption, at 12.5% you would net 6.09%, still far ahead.

One caveat: that Rs 1.25 lakh exemption is shared across all your equity gains for the year - direct stocks, equity mutual funds, and arbitrage combined. If you are already using it up elsewhere, the arbitrage LTCG is taxed at 12.5% from the first rupee, which is still less than half the slab rate.

The edge is bracket-dependent - do not blindly follow it

This is where most write-ups stop, and it is exactly where the advice can mislead. The arbitrage edge comes from equity taxation being lower than your slab. If your slab is low, equity taxation can actually be higher. Here is the same 9-month, sub-12-month scenario across brackets:

Read this carefully:

• Nil or 5% bracket: A liquid fund taxed at your slab is cheaper than 20.8% STCG. Do not chase arbitrage here for short holds. The reflex advice is correct for you.
• 20% bracket: Under the new regime this covers a wide income band. Short-term it is a wash (20.8% either way), so pick on convenience and yield. Arbitrage only pulls ahead if you cross the 12-month line into LTCG.
• 30% bracket: Arbitrage wins at every horizon, and wins big past 12 months.

So the honest version of the rule is: the arbitrage advantage is a 30% bracket tool for sub-year money, and a tool for everyone who can hold past 12 months. Below that, the liquid fund reflex is not wrong.

Exit timing and the small print

Return and tax are only two of the three variables. The third is when you can get out cleanly.

Liquid funds carry a graded exit load only for the first 7 days (0.0070% on day 1 tapering to 0.0045% by day 6, zero from day 7). After a week there is no penalty. Many offer instant redemption up to Rs 50,000 the same day, and the rest settles T+1. This is genuinely the more liquid instrument, which matters if the money might be pulled at short notice.

Arbitrage funds typically levy a 0.25% exit load if you redeem within 15 to 30 days, and settle T+2. That load exists precisely to discourage the very short holds where arbitrage does not fit. If there is a real chance you need the cash inside a month, the exit load can wipe out the tax edge - a 0.25% hit on a short hold is large relative to the gain earned.

There is also the return-lumpiness risk. In a flat, low-volatility stretch the arbitrage spread narrows and the fund can underperform a liquid fund for that period. Over 3 to 12 months this usually evens out, but arbitrage is not the place for money you might need in an exact bad week.

Putting it together: which for which money

For very short buffers and true emergency cash, the liquid fund’s faster settlement and near-zero exit load win regardless of bracket - the tax saving on a few weeks of interest is trivial and not worth the exit-load risk.

A quick note on the old debt-fund play

Before April 2023, debt mutual funds held over 3 years got LTCG with indexation, which made them the smart parking choice for high-bracket investors. That is gone - debt funds, including liquid funds, are now taxed at slab rate for all holding periods. The clever-tax role that debt funds used to play has been inherited by arbitrage funds, which is the main reason they deserve a fresh look in 2026. If your mental model still says “park in an ultra-short debt fund for the tax break,” it is out of date.

Bottom line

For short-term cash, match the instrument to your bracket and horizon, not to habit. If you are in the 30% slab, use an arbitrage fund for anything you will hold beyond a month - it earns the same gross as a liquid fund and hands you roughly 0.7% more per year after tax under 12 months, and up to about 2% more if you cross the 12-month line and use the Rs 1.25 lakh equity LTCG exemption. If you are in the 20% bracket, it is a coin toss under a year and worth it only past 12 months. If you are in the nil or 5% bracket, stick with the liquid fund - equity taxation actually costs you more. And keep genuine emergency money in a liquid fund regardless, for the faster exit. Check the current exit load and recent low-volatility performance of any arbitrage fund before you switch a large sum.

Figures here are illustrative, use representative mid-2026 yields and current tax rules, and are not investment advice. Confirm the numbers for your own bracket and the specific fund before acting.