Arbitrage Fund vs Liquid Fund: Why the Equity Tax Status of Arbitrage Funds Beats Liquid for HNIs

Treasury managers parking surplus cash for 12 to 18 months at India's largest family offices have been steadily rotating from liquid funds to arbitrage funds since the Finance Act 2023 took indexation away from debt-oriented mutual funds. The rationale is purely arithmetic: an investor in the 30% slab earning 6.5% gross from a liquid fund retains roughly 4.4% post-tax, while the same gross yield from an arbitrage fund, held for at least 12 months, retains around 5.7% after the 12.5% long-term capital gains rate in Section 112A of the Income-tax Act 1961. The gap, when annualised across a Rs 5 crore corpus, is Rs 6.5 lakh per year, and that is before surcharge effects.

This piece compares the two structures category-by-category, drawing on AMFI's category-level disclosures and the post-Budget 2024 capital gains regime that took effect from 23 July 2024. We avoid statements about specific fund returns; we use only AMFI-published category benchmarks and the rates published by the CBDT and SEBI.

Side-by-Side Comparison

Arbitrage funds and liquid funds occupy adjacent slots on the SEBI scheme-categorisation circular dated 6 October 2017, but they are built on fundamentally different engines. A liquid fund (Category B-I under SEBI's Master Circular for Mutual Funds, May 2024) invests only in money-market and debt instruments with residual maturity up to 91 days. An arbitrage fund (Category C-I) invests at least 65% of net assets in equity, but neutralises directional market risk by simultaneously selling stock futures against each long cash position, locking in the cash-futures basis as the return.

The cash-futures basis tracks the implied repo rate in India's stock-futures market and historically averages 50 to 150 basis points over the prevailing call rate. With the RBI repo rate at 6.50% (unchanged through April 2025), arbitrage funds and liquid funds have produced similar gross yields in the 6 to 7% band over the past 12 months, per AMFI category data updated monthly. The differentiator is not pre-tax return; it is tax status.

The key cell in that grid is the third row. The Finance Act 2023 inserted Section 50AA, which redefined a specified mutual fund so that any scheme investing more than 65% of total proceeds in debt or money-market instruments, bought on or after 1 April 2023, is taxed at slab rates regardless of holding period. Liquid funds fall squarely in this bucket. Arbitrage funds do not, because their 65%-plus equity exposure preserves their equity-oriented status under clause (a) of the Explanation to Section 112A.

Tax Treatment

The arithmetic is unambiguous once you put it in a tax workbook. Take an investor in the highest new-regime slab, with Rs 24 lakh-plus taxable income, taxed at 30% under Section 115BAC for FY 2025-26, with 4% health-and-education cess applied. Surcharge in the new regime is capped at 25% under the amended Finance Act 2023 schedule, so the marginal cost of slab-taxed income at the Rs 5 crore-plus level is 30% x 1.25 x 1.04 = 39.0%.

Now run the same math on arbitrage LTCG. Section 112A applies a flat 12.5% (post the Budget 2024 Memorandum issued by CBDT on 23 July 2024) to gains over Rs 1.25 lakh per financial year, with surcharge capped at 15% on Section 112A income under Finance Act 2022. So the marginal cost of arbitrage LTCG at the highest income level is 12.5% x 1.15 x 1.04 = 14.95%.

A few subtleties are worth flagging. First, the Rs 1.25 lakh LTCG exemption is per assessee, per financial year, aggregated across all Section 112A gains; an investor already harvesting equity LTCG from listed shares cannot double-dip. Second, STCG on arbitrage funds was raised from 15% to 20% by Budget 2024 with effect from 23 July 2024, narrowing the short-term advantage but leaving the long-term gap intact. Third, dividend distributions from either fund are now taxed at slab in the unitholder's hands under Section 56(2)(x) following the abolition of DDT in Budget 2020, so the comparison is cleanest when both funds are held in growth option.

Investors below the Rs 12 lakh income threshold should also note Section 87A. The rebate under FY 2025-26 is Rs 60,000 in the new regime, but it does not apply to special-rate income such as Section 112A LTCG (Finance Act 2023, proviso to Section 87A). So a small investor cannot zero out arbitrage LTCG above the Rs 1.25 lakh exemption using the rebate; they will pay the 12.5% flat rate on the excess.

Yield, Liquidity, and Real-World Drag

A pre-tax yield comparison from AMFI category performance disclosures for the year ending March 2025 puts liquid funds at roughly 7.04% category median and arbitrage funds at 6.38%, a 66 basis-point pre-tax gap. That gap evaporates the moment you apply the 30% slab to the liquid fund. Net of expense ratio (typical 0.20% to 0.34% direct plan in either category) and 4% cess, the post-tax yield for a 30% slab investor with a 13-month horizon works out roughly as follows:

The arbitrage fund clears liquid by 54 basis points in net terms despite starting 66 basis points behind. On a Rs 5 crore deployment that is Rs 2.7 lakh additional after-tax income per annum, a meaningful number for a parking strategy that takes no equity beta.

Three operational drags deserve mention. The arbitrage exit load typically applies for 30 days versus 7 days for liquid funds, so very-short-term cash should not migrate. Settlement is T+1 in both, but liquid funds offer instant-redemption windows up to Rs 50,000 per day per scheme under SEBI's circular dated 24 September 2017. Finally, arbitrage spreads compress in low-volatility periods; the 90-day rolling spread on Nifty futures dropped to about 41 basis points annualised in February 2025 per NSE settlement data, before recovering to roughly 92 basis points by April. Returns are not riskless; they are a function of the implied funding rate available to arbitrageurs.

Who Should Pick Which

The decision matrix collapses to three variables: investor's marginal tax rate, holding-period certainty, and liquidity tolerance. We have built the SIP Calculator and Lumpsum Calculator to run scenarios with the FY26 capital gains rates baked in; both let you toggle between equity and debt taxation to see the wedge for your numbers.

Pick an arbitrage fund if your marginal rate is 20% or above, you can commit to a 12-month minimum hold, and you are parking Rs 25 lakh or more. The 7.80 to 24.05 percentage-point tax wedge in the table above is durable until the law changes, and the only operational risk is a few months of tight basis when volatility collapses. Family-office treasurers and salaried professionals with bonus parking horizons of 12 to 18 months are the natural users, alongside the analysis we ran in our companion piece on FD vs debt mutual fund post-tax for FY 2025-26.

Pick a liquid fund if your horizon is below three months, your marginal rate is in the 5% to 10% band (where the wedge is sub-3 ppt and not worth the operational complexity), or you need same-day redemption above Rs 50,000. Corporate treasurers managing payroll buffers, GST output cycles, or short-term margin money fall in this category; the slab tax is a feature, not a bug, because the holding window does not justify locking in for 12 months.

Investors below the Rs 4 lakh new-regime threshold (income fully zeroed by Section 87A in the new regime up to Rs 12 lakh) face a flatter trade-off, because their slab is 0% and arbitrage LTCG would still be 12.5% on amounts over Rs 1.25 lakh. Here the liquid fund wins on simplicity and same-day redemption; the LTCG wedge becomes negative for very small investors with no slab tax to escape.

NRI investors should layer in TDS. Liquid fund redemption gains attract TDS at 30% under Section 195 (post Finance Act 2023 slab-tax amendment for specified mutual funds). Arbitrage funds attract 20% TDS on STCG under Section 111A and 12.5% on LTCG above Rs 1.25 lakh under Section 112A. The 17.5 percentage-point TDS wedge is even sharper than the resident wedge. Note that India retains taxing rights on Indian-source capital gains at the domestic 12.5% rate under most DTAAs; treaty relief for resident NRIs is generally a credit-method offset against home-country tax, not an exemption.

For investors evaluating arbitrage as a parking option versus a direct equity allocation, the ELSS Calculator is a useful reality check. ELSS shares the same Section 112A tax treatment but adds Section 80C deduction in the old regime, while taking on full equity beta. Arbitrage gives you the tax shell without the volatility, but at a yield closer to debt than equity.

FAQ

Are arbitrage funds risk-free like liquid funds?

No. Arbitrage funds carry basis risk; the cash-futures spread can compress sharply in low-volatility regimes, dragging monthly returns near zero. They also carry small overnight risk on unhedged equity if a futures position cannot roll cleanly at expiry, and counterparty risk via clearing-corporation margins. Liquid funds carry credit risk on underlying papers; the SEBI circular of 20 October 2019 requires liquid funds to invest only in instruments rated A1+ or sovereign, so credit risk is small but non-zero. Both are mark-to-market and can show negative one-day NAV moves in stress events.

What is the minimum holding period to get equity tax treatment on arbitrage funds?

The fund itself must maintain over 65% equity allocation on average to qualify as equity-oriented under Section 112A; this is a fund-level test the AMC ensures. The investor's own holding period determines whether the gain is short-term (12 months or less, STCG at 20% under Section 111A) or long-term (more than 12 months, LTCG at 12.5% over Rs 1.25 lakh under Section 112A). For a Rs 5 crore corpus aiming to extract the full LTCG exemption, the investor must hold for at least 12 months and 1 day.

Did Budget 2024 change anything for liquid funds?

Indirectly. The STCG rate under Section 111A rose from 15% to 20%, and LTCG under Section 112A rose from 10% to 12.5% with the exemption rising from Rs 1 lakh to Rs 1.25 lakh, both effective 23 July 2024. Liquid funds were already slab-taxed under Section 50AA from 1 April 2023, so Budget 2024 did not directly touch their treatment. The relative wedge versus arbitrage actually widened slightly because arbitrage STCG at 20% is still well below the 30% slab applicable to liquid funds.

Can I claim Section 87A rebate on arbitrage LTCG?

No. Finance Act 2023 inserted a proviso to Section 87A clarifying that the rebate does not apply to income chargeable under Section 112A (or other special-rate provisions). So even if your total income is below Rs 12 lakh and you would otherwise benefit from the Rs 60,000 new-regime rebate, arbitrage LTCG above the Rs 1.25 lakh exemption is taxed at 12.5% in full.

How does the comparison change for grandfathered units bought before 1 April 2023?

Liquid fund units bought on or before 31 March 2023 retained the old indexation regime (LTCG over 36 months at 20% with indexation). Finance Act 2023 and the subsequent Budget 2024 indexation withdrawal apply only to units acquired from 1 April 2023 onwards. Pre-April-2023 holdings past the 36-month mark still carry that legacy advantage, which the new rules cannot retrospectively undo.

Do arbitrage funds qualify for Section 54F or 54EC reinvestment exemption?

Yes for 54F, no for 54EC. Section 54F covers reinvestment of long-term capital gains from any long-term asset other than a residential house into a residential house, and arbitrage units held over 12 months qualify as the source asset. Section 54EC, however, applies only to LTCG from land or building reinvested into NHAI/REC/IRFC bonds; mutual fund units are outside its scope. The cap on 54EC bonds is Rs 50 lakh per financial year per assessee, unchanged.

What is the practical cap on arbitrage fund AUM I should park?

There is no statutory cap, but liquidity is finite. Industry AUM in arbitrage stood at roughly Rs 2.27 lakh crore at end-March 2025 per AMFI data, and basis spreads have stayed workable. An individual position up to Rs 100 crore in any single scheme is well below per-fund liquidity thresholds; beyond that, split across two or three AMCs.