I. Legal Basis - Why Margin is Mandatory, Not Discretionary

Derivatives are leveraged. To protect market integrity, the law makes margin a condition precedent to trading.

1. NSE F&O Regulation 3.10 - Margin Collection from Constituents

"The Trading Members must demand from its constituents the Margin Deposit which the member has to provide under these Trading Regulations... Trading Member shall buy and / or sell derivative contracts on behalf of constituents only on receipt of margin of minimum such percentage as the Relevant Authority may decide... Trading Member may collect higher margins from constituents, as he deems fit."

Interpretation settled by IndiaCorpLaw and SEBI:

• Minimum = mandatory (SPAN + Exposure prescribed by Clearing Corp). Cannot be waived.
• Higher = discretionary - broker can ask for more to cover volatility.
• Collection = before trade.

2. SEBI Circular CIR/DNPD/7/2011 dated 10 Aug 2011
From 1 Sep 2011, exchanges must levy penalty on Trading Members for short-collection / non-collection of margins in F&O and Currency Derivatives. Maximum 5% of shortfall. This made brokers strictly liable to collect.

3. RBI for OTC Derivatives
For non-cleared OTC derivatives, RBI Master Directions + A.P. (DIR Series) Circular No. 06 dated May 08, 2024 mandate two-way exchange of:

• Variation Margin (VM) - daily MTM
• Initial Margin (IM) - to cover potential future exposure

II. Types of Margins in Exchange-Traded Derivatives

In India, Clearing Corporations compute 6 margins intraday:

1. Initial Margin = SPAN Margin + Exposure Margin

• SPAN: Based on worst-case loss of portfolio over 1 day (covers 99% VaR). Computed by CME SPAN tool.
• Exposure: Additional buffer - 2% for Index Futures/Options, 2-3.5% for Stock.

2. Mark-to-Market / Variation Margin
Net loss of position at EOD. If you are long Nifty @ 26,000 and close is 25,800, you pay Rs 200 x lot size same day.

3. Extreme Loss Margin (ELM)
1% for index, 3.5% for stocks - to cover black swan gaps.

4. Additional / Special / Ad-hoc Margin
Imposed during elections, RBI policy, high volatility, expiry week.

5. Concentration Margin
If one client holds >5% of open interest in a stock.

6. Net Option Value + Premium Margin
For short options.

Total Margin Blocked = Initial + ELM + MTM + Additional

III. How Collection Works Today - Post-2020 SEBI Reform

This is critical after Karvy case:

1. Upfront Collection: No trade without margin in trading system. NSE/ BSE block order if margin insufficient.
2. Pledge-Repledge Mechanism: Client securities must be pledged via CDSL/NSDL "Pledge" to broker, who re-pledges to Clearing Member -> Clearing Corp. No off-market transfer to broker's pool account.
3. 50% Cash Rule: At least 50% of margin must be in cash or cash equivalents. Cash = INR, Bank Guarantee, FD (with lien to CC), G-Sec, T-Bills, Liquid Mutual Funds. Balance 50% can be non-cash (pledged shares with haircut).
4. Client-Level Segregation: Clearing Corps now verify margin at client level, not broker pool level. Brokers cannot use excess collateral of Client A to meet shortfall of Client B.
5. Early Pay-In (EPI) Benefit: If client delivers shares early via EPI block, Clearing Corp must recognise that EPI when calculating margins on subsequent eligible transactions.

IV. Case Laws - The Core of Margin Litigation

A. Indian Courts / Tribunals

1. Bonanza Portfolio Ltd. v. Roshanara Bhinder, Bombay High Court, 16 April 2015 - Leading authority
Fact: Broker squared off MCX commodity derivatives without additional margin demand.
Held: Bye-laws providing for margin are mandatory safeguard to mitigate loss. Broker must demand margin, client must fail to pay despite demand, only then can square off. Square-off without demand is illegal.

"makes it mandatory for the broker to square off the transactions immediately upon there being a shortfall which according to the broker had not been paid by the constituent inspite of demand"

2. Kritika Nagpal v. Geojit Financial Ltd., Delhi High Court
Held: Even if broker-client agreement gives "sole discretion to square off without reference or prior notice", such discretion cannot be exercised without due notice/intimation. Principle of audi alteram partem applies to drastic financial actions.

3. Suwarna Choudhary v. CD Equisearch Pvt Ltd, NSE Arbitration Appeal Bench, 2018-19
Fact: Client had Rs 1.23 lakh margin, bought 1 lot Maruti Suzuki and Canara Bank futures. Market fell sharply. Broker squared off same day without time to bring margin.
Held: NSE Appellate Bench held broker cannot square off without proper notice even if margins fall below required level due to sudden fall. Ordered broker to pay entire loss Rs 1.23 lakh + 9% interest. Now cited as "Client must get time for margin before broker squares off position".

4. 2016 (7) TMI 1354 - High Court - Arbitration Challenge u/s 34
Fact: Broker liquidated client's F&O position citing agreement, no proof of margin call demand produced.
Held: Regulation 3.10 imposes compulsory duty. Tribunal ignored mandatory market regulation and relied only on private agreement treating liquidation as discretionary - perverse. Award set aside for patent illegality. Establishes hierarchy: Exchange Regulation > Private Agreement.

5. SEBI v. Kishore R. Ajmera, (2016) INSC 165, Supreme Court
Court examined synchronized artificial trades where derivative settlement price was manipulated via aggressive cash market auction bids. Held that when derivative contracts settle against single call auction print, spoofing is fraud under SEBI Act. Used to justify why MTM settlement and ELM must be linked to genuine cash price.

6. Consortium Securities P. Ltd., SEBI Order
Enquiry Officer held violation of SEBI Circular 27 July 2000 which says margin shall not be less than 10% of open position. Broker argued 2005 circular made collection discretionary. SEBI held: minimum 10% is mandatory, discretion is only to collect more than that.

B. International - ISDA / Collateral

7. Lomas v JFB Firth Rixson EWCA Civ 419 (England)
On ISDA Master Agreement Section 2(a)(iii) - if you fail to post collateral (Event of Default), other party's obligation to post collateral is suspended but not extinguished. This is why margin calls under CSA are critical - failure freezes the contract.[2012]

8. Lehman Brothers International (Europe) Re Collateral
UK Supreme Court held collateral transferred under English CSA with title transfer is absolute transfer - client is unsecured creditor. This led to global reform - now Initial Margin must be segregated with third-party custodian and cannot be re-hypothecated. Reflected in RBI 2024 rules and ISDA 2016 VM CSA + 2018 IM CSA.

V. Summary Table for Arbitration / Court