1. Why Margin Exists

A derivative is a leveraged promise. To ensure neither party defaults when market moves, regulators mandate collateral.

Two global regimes:

a) Exchange Traded Derivatives (NSE, BSE, MCX): Cleared by CCP (NCL, ICCL). Margins are collected upfront by broker and deposited to clearing corp.

b) Non-Centrally Cleared Derivatives (OTC) - BIS/IOSCO Framework:
All covered entities must exchange, on a bilateral basis, the full amount of variation margin with zero threshold on a regular basis, and initial margin with threshold not to exceed €50 million. Initial margin safeguards from potential fluctuations during close-out and replacement in case of default, variation margin safeguards from current market value exposure.

2. Types of Margin Obligations in India

1. Initial Margin / SPAN Margin:
Minimum to enter position. In India calculated by SPAN (Standard Portfolio Analysis of Risk) - worst loss portfolio can suffer in a day. Mandatory to collect before trade.

2. Exposure / Additional Margin:
Over and above SPAN to cover extreme moves. For index, typically 3-5%.

3. Mark-to-Market (MTM) / Variation Margin:
Daily settlement of profit/loss. If Nifty falls 200 points, short seller makes money, long loses - loser must pay VM same day. Variation margin is deemed to "settle outstanding exposure".

4. Two-Way Margining:
For uncleared OTC, both parties must post IM and VM, unlike old one-way CSA where only client posted.

5. Other SEBI Margins:

• Concentration margin, Delivery margin in expiry week
• Pledge/re-pledge margin: Since Feb 2020 SEBI circular, margin must be by way of pledge created in depository system, not by moving shares to broker pool account.

3. Who Owes What - Legal Obligations

Broker's Obligation:

• Collect upfront margin before executing derivative order - mandatory as per SEBI circular dated Aug 10, 2011 on short-collection/non-collection.
• Report client-wise margin to exchange. In a 2019 adjudication, SEBI penalized brokers for not uploading obligation compulsory for each client wise.
• Issue proper margin call and give reasonable time before liquidation.

Client's Obligation:

• Maintain margin. If fails, broker is entitled to liquidate. Failure to pay margin clause: failure may give rise to default action including closing out of all or some open positions.
• In US law, if you fail to timely meet the call by depositing cash, brokerage firm is required to sell your securities at the market, even without notice.

4. Detailed Case Laws

A. Collection is Mandatory - Indian Trinity

1. Bonanza Portfolio Ltd. v. Mrs. Roshanara Bhinder - Bombay High Court, 16 April 2015
Leading case. Broker squared off client's derivative positions claiming margin shortfall without issuing formal demand.
Held: Broker cannot square off open derivative positions without demanding additional margin. Further, the Bombay HC ruled client must get time for margin before broker squares off. Lawyer for complainant argued: even after intimation, if client fails to pay additional margin next day, then broker can sell, otherwise not.

2. Whether Collection of Margin on Derivative Trades is Mandatory? - Indiacorplaw analysis of same
Court held his right to square off only arises after proper demand. This has been followed in multiple arbitrations.

3. Bonanza Commodities v. Bhinder - MCX Bye-Laws
Reinforced principle that unauthorized transactions without proper margin calls are invalidatable and brokers cannot claim against constituents. The petitioner failed to issue adequate margin calls as mandated by MCX bye-laws before closing Bhinder's positions, which is a critical procedural lapse.

B. Broker's Right to Liquidate - When Valid

4. Ed&f Man Commodity Advisers Ltd v. Fluxo-Cane Overseas Ltd - UK High Court
High Court ruled in favor of MCA, affirming its contractual right to issue margin calls and to liquidate FCO's trading positions upon failure to meet margin requirements. Judgment detailed how margin calls were properly issued and that non-compliance justified liquidation.

5. Hirsch - Quebec Court of Appeal / Richardson Wealth
Plaintiffs alleged broker exercised rights abusively when it liquidated margin accounts after failure to satisfy nearly $8m call due to technical glitch that magnified margin available. Court upheld broker's strict enforcement: Mind Your Margins - Appellate Courts Uphold Securities Brokers' Rights To Strictly Enforce Margin Agreements. Principle: broker to enforce, strictly and instantly, a margin requirement which the rules of his exchange entitle him to enforce does not give customer a cause of action.

C. Shared Liability for Delay

6. Chinese Futures Company Case - Jewelry Company
Professional market participant promised but failed to deposit additional margin, held 30% responsible for contributory negligence. Court held forced liquidation is a mandatory obligation for futures companies, not merely discretionary right. Companies cannot delay duty.

D. SEBI Penalty Regime

7. SMC Global Securities Ltd Vs SEBI - SAT
SEBI circular dated Aug 10, 2011 deals with short-collection/non-collection of client margins - Derivative Segment. Stock exchanges empowered to penalize brokers. SAT held ultimate power rests with SEBI except... confirms penalty framework.

8. DJS Stock and Shares Ltd Vs DCIT - ITAT Mumbai
Broker paid penalty for shortfall in margin money levied by SEBI. Question: Is it deductible under Section 37(1) as business expense or disallowed as penalty for infraction of law?
Held: penalty related to shortfall in margin money is not for infraction of law, cannot be considered as penalty for violation. Hence deductible. Important: SEBI margin penalty is compensatory/regulatory, not penal for illegality.

9. Uks Oils Pvt Ltd vs SEBI - 5 May 2016
Client failed to meet margin/MTM obligation. WTM of SEBI not justified in passing ex-parte order without considering impossibility. Shows SEBI must consider proportionality.

10. MCX Negative Crude Settlement 2020 - Bombay HC
Court held settlement linked to NYMEX, SEBI circular only recognised negative pricing was market reality and introduced revised margin framework. Implication: Margin obligations can be revised overnight in extraordinary volatility.

5. Practical Checklist to Avoid Litigation

For Brokers:

• Collect upfront margin, report client-wise, maintain proof of margin call (SMS, email, terminal log). MCX/NSE by-laws require time-stamped call.
• Cannot liquidate same day without notice - give T+1 day as per 2015 ruling.

For Clients / Corporates:

• If you don't meet call, broker's liquidation is protected. You cannot sue for notional loss of what would have happened if position continued.
• If broker liquidates without call, you can claim entire loss as invalid trade under Bonanza ratio.
• For OTC uncleared derivatives under RBI: Exchange both IM and VM daily, zero threshold, minimum transfer amount €500k. Documentation under ISDA CSA.