Peak Margin
SEBI's framework that captures the highest margin a client uses at any point in the trading day, closing the loophole of unlimited broker-granted intraday leverage.
Definition
Peak margin refers to the maximum margin utilised by a client at any intraday snapshot during the trading session, as defined and enforced by SEBI through circulars phased in from December 2020 and fully effective from September 2021. Under the framework, exchanges take at least four random intraday snapshots (in addition to the end-of-day position) and report the highest margin obligation observed across all of them. Brokers must ensure clients have sufficient collateral to cover this peak obligation; if they do not, the shortfall is penalised through a margin penalty levied by the exchange on the broker, which the broker passes on to the client. The rule effectively binds the initial margin requirement to actual positions held at any point in the day, not just at market close.
Why it matters
Before peak margin rules, many Indian brokers offered 5x–20x intraday leverage on F&O positions by simply requiring clients to square off before 3:20 PM. A trader with Rs 50,000 of collateral could briefly control positions requiring Rs 5,00,000 of margin because end-of-day reporting would never catch the exceedingly intraday exposure. SEBI's peak margin framework closed this gap: since any intraday snapshot can be the one reported to the exchange, brokers can no longer safely extend uncapped intraday credit. For retail traders this means the available margin for intraday F&O trades is now directly tied to the cash and approved collateral held in the account. It raised the effective capital needed for high-frequency intraday futures and options writing strategies, but it also eliminated the systemic risk of billions of rupees of unhedged intraday exposure sitting off the exchange's radar.
How it works
The exchange's risk management system selects intraday snapshot times randomly (to prevent gaming). At each snapshot, the required margin for every open position — computed using the latest SPAN parameters — is compared against the client's available collateral. The highest margin obligation observed across all snapshots in the day is the peak margin. End-of-day positions are also included. A shortfall at any snapshot triggers a short-margin penalty: 0.5% per day of the shortfall amount for shortfalls up to 1 day, rising to 1% for persistent breaches, collected by the exchange from the broker.
Example
Say a trader has Rs 1,00,000 in their F&O account. At 10:30 AM they buy two lots of Nifty futures (hypothetically requiring Rs 1,80,000 of margin), intending to close before 3:20 PM. If the exchange snapshot falls at 10:45 AM and captures the open position, the broker is penalised for the Rs 80,000 shortfall even though the trade is squared off by 2 PM. Under peak margin rules the trader can only hold positions whose peak margin requirement fits within their available collateral at all times during the session.
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