Intraday Trading Rules in India: SEBI Margins, Square-Off, and Broker Policies

Understanding intraday trading rules in India is not optional — it is the difference between surviving your first year and blowing up your capital in weeks. SEBI has progressively tightened margin norms, brokers have layered their own risk management on top, and the penalties for ignorance are measured in real rupees debited from your account. Yet most retail traders enter the market without reading a single circular.

This guide breaks down every rule that directly affects your intraday P&L: peak margin requirements, product types, auto square-off mechanics, and the tax treatment that eats into whatever you manage to keep. No theory — just the exact numbers and timelines you need to trade on NSE and BSE without nasty surprises.

How SEBI Defines Intraday Trading and Why It Matters

SEBI does not use the term "intraday trading" in its circulars. What it regulates is margin collection and position squaring within a single trading session. When you buy 500 shares of TATAPOWER at 9:15 AM and sell them by 3:15 PM, your broker classifies that as an intraday (MIS or equivalent) order. The trade settles at the end of the day with no delivery obligation.

The critical distinction is between delivery-based trades (CNC) and intraday speculative trades (MIS/BO/CO). SEBI's margin framework treats them differently. For delivery, you pay the full trade value upfront under the peak margin rules. For intraday, brokers historically offered 10x–20x leverage — but SEBI's phased margin norms from 2020–2021 have permanently changed that equation.

Why does this matter? Because if you opened a trading account in 2018 and stopped reading circulars, you are operating on assumptions that no longer hold. The leverage you had is gone. The margin calls are stricter. And the penalties brokers face for non-compliance get passed directly to you.

SEBI Intraday Trading Margin Rules: The Peak Margin Framework

The single most impactful regulation for intraday traders came via SEBI circular SEBI/HO/MRD/DP/CIR/P/2020/127 dated July 20, 2020, which introduced the peak margin reporting mechanism. Here is exactly what changed:

• Before September 2021: Brokers could offer intraday leverage by collecting only a fraction of the margin upfront and topping it up if the position moved against you. A ₹1,00,000 account could take positions worth ₹10,00,000 or more.
• From September 1, 2021 (final phase): Brokers must collect 100% of the applicable margin upfront — including SPAN + Exposure margin for F&O and VAR + ELM for equity. Peak margins are checked 4 times a day by the clearing corporations (NSE Clearing, BSE's ICCL).
• Penalty for shortfall: If the margin collected from you falls short of the peak margin at any snapshot, the broker faces a penalty of 1% per day (annualized) for shortfalls up to ₹1 lakh, and 5% per day for amounts beyond that. Brokers pass this cost to you.

What This Means in Practice

Take a stock like HDFCBANK trading at ₹1,600. The VAR margin might be around 12% and ELM (Extreme Loss Margin) another 3.5%. So the total margin required to carry an intraday position of 500 shares (notional value ₹8,00,000) would be approximately:

₹8,00,000 × 15.5% = ₹1,24,000

Before the peak margin rule, a broker might have let you take this position with ₹40,000–₹50,000. Now, you need the full ₹1,24,000 in your account before you place the order. The SEBI intraday trading margin rules and auto square-off time policies work together — if your margin dips below the required level at any of the four daily snapshots, you face either a penalty or forced liquidation.

For NIFTY futures, the SPAN margin alone runs around ₹1,00,000–₹1,20,000 per lot (lot size: 25). Add exposure margin, and you're looking at ₹1,40,000–₹1,60,000 per lot for intraday. BANKNIFTY (lot size: 15) typically requires ₹1,10,000–₹1,50,000 per lot depending on volatility. These figures fluctuate daily based on the clearing corporation's risk calculations.

Key takeaway: The era of high intraday leverage on regulated brokers is over. Anyone offering you 10x or 20x on equity intraday is either violating SEBI norms or using creative product structures that carry hidden risks.

Auto Square-Off: Timelines, Triggers, and Broker-Specific Policies

SEBI does not mandate a specific auto square-off time. What SEBI mandates is that margins must be maintained and that brokers have robust risk management systems. The auto square-off mechanism is a broker-level risk management tool — and the timelines vary significantly.

Time-Based Auto Square-Off

Here are actual auto square-off times from major brokers as of recent policy updates:

• Zerodha: Equity MIS orders squared off between 3:15 PM and 3:20 PM. F&O MIS orders squared off between 3:15 PM and 3:20 PM.
• Groww: Intraday positions squared off starting 3:15 PM.
• Angel One: Auto square-off for MIS positions begins at 3:15 PM.
• Upstox: MIS positions squared off starting 3:15 PM (equity), F&O at 3:15 PM.
• ICICI Direct: Intraday positions squared off around 3:15 PM for equity.

Critical detail: Most brokers charge an auto square-off penalty — typically ₹20–₹50 per order. Zerodha charges ₹50 + GST per order if the RMS system squares you off. Over 200 trading days, letting auto square-off handle your exits could cost you ₹10,000–₹15,000 annually in penalties alone. Always close positions manually.

Margin-Based Auto Square-Off

This is more dangerous because it can happen at any time during market hours. If your MTM (mark-to-market) loss erodes your available margin below the broker's threshold, the RMS system will liquidate your position — partially or fully — without warning.

For example, if you take a BANKNIFTY weekly options position with ₹30,000 margin and your unrealized loss hits ₹25,000, your available margin drops to ₹5,000. The broker's system will typically trigger a square-off when available margin hits 0 or a predefined buffer (often 50% of the required margin). You don't get a phone call. You get an SMS after the position is already closed — often at the worst possible price due to market orders.

Expiry Day Rules

On weekly expiry days (Thursday for NIFTY and BANKNIFTY, other days for FINNIFTY/MIDCPNIFTY), brokers tighten margins further. Zerodha, for instance, increases margin requirements on expiry-day options positions and may square off ITM options before 3:00 PM to avoid physical settlement complications in stock options. SEBI mandated physical settlement for all stock F&O from October 2019, making expiry-day management significantly more complex.

Product Types: MIS, CO, BO, and What SEBI Actually Allows

Understanding product types is essential to navigating intraday trading rules in India, because each product type determines your margin requirement, leverage, and risk exposure.

MIS (Margin Intraday Square-off): The standard intraday product. You get slightly reduced margins compared to NRML (overnight) positions. Must be squared off before the broker's cutoff time. Available for equity, F&O, and commodity segments.

CO (Cover Order): An intraday order with a compulsory stop-loss. Because the maximum loss is capped by the stop-loss, brokers offered higher leverage. However, after SEBI's peak margin norms, the additional leverage advantage has shrunk significantly. Some brokers (like Zerodha) discontinued CO for options.

BO (Bracket Order): Similar to CO but with both a stop-loss and a target. Includes a trailing stop-loss feature on some platforms. Bracket orders have been discontinued by several brokers (Zerodha stopped BOs in 2019) due to system-level complexities during volatile sessions.

NRML (Normal): For carrying positions overnight. Full SPAN + Exposure margin required. Not intraday by definition, but relevant because converting an MIS position to NRML (if your broker allows it) requires you to have the full margin available before 3:15 PM.

SEBI's position: SEBI does not formally approve or regulate product types like MIS or CO. These are broker-level constructs. SEBI only regulates the underlying margin obligation. If a broker's product type results in under-margining at peak margin snapshots, the broker faces penalties — and those penalties flow to you.

Tax Rules for Intraday Trades: STT, CTT, and Income Tax Classification

The tax treatment of intraday trades is a critical component of intraday trading rules in India, and it differs fundamentally from delivery-based investing.

STT (Securities Transaction Tax)

• Equity intraday: STT is 0.025% on the sell side only. If you buy and sell ₹5,00,000 worth of RELIANCE intraday, your STT is ₹125 (0.025% of ₹5,00,000). Compare this with delivery trades where STT is 0.1% on both buy and sell sides.
• Futures: STT is 0.0125% on the sell side.
• Options: STT is 0.0625% on the sell side (on premium). On exercise, STT is 0.125% on the settlement price — which is why exercising deep ITM options on expiry can result in disproportionately high STT.

Income Tax Classification

Intraday equity profits are classified as speculative business income under Section 43(5) of the Income Tax Act. F&O profits (including intraday F&O) are classified as non-speculative business income.

This distinction has real consequences:

• Speculative losses (intraday equity) can only be set off against speculative profits. They cannot be set off against F&O income, salary, or other heads. Carry-forward period: 4 years.
• Non-speculative losses (F&O) can be set off against any income head except salary. Carry-forward period: 8 years.
• If your total turnover exceeds ₹10 crore (₹2 crore for non-audit cases where profit is less than 6% of turnover or if the total income exceeds the basic exemption limit), tax audit under Section 44AB is mandatory.

Turnover Calculation

For intraday equity, turnover = absolute sum of all profit and loss per trade. For futures, turnover = absolute sum of settlement profits and losses. For options, turnover = absolute premium received + absolute profit/loss on squared-off positions. This is per ICAI Guidance Note and commonly accepted practice, though interpretation varies.

Example: If you made ₹50,000 profit on 100 trades and ₹40,000 loss on 80 trades, your intraday equity turnover is ₹90,000 — not ₹50,000 or ₹10,000. Misunderstanding this leads to incorrect audit applicability assessment.

Common Violations and Penalties Retail Traders Face

Most retail traders unknowingly violate margin norms. Here are the most common scenarios:

• Pledged margin misunderstanding: You pledge mutual fund units worth ₹2,00,000 and receive ₹1,60,000 collateral margin (after haircut). You use this for intraday F&O. But you have no cash in your account. SEBI requires at least 50% of the total margin to be in cash or cash-equivalent (FDs, T-bills). If ₹1,40,000 margin is required, at least ₹70,000 must be cash. Violation of this results in a penalty charged by the broker.

• Position conversion failures: You take an MIS position on TATAMOTORS, the trade moves against you, and you decide to convert to NRML to hold overnight. But your account doesn't have the full NRML margin. The broker rejects the conversion and squares off your position at 3:15 PM — at whatever price the market offers.

• Multiple broker penalty stacking: Some traders split positions across Zerodha, Angel One, and Groww to "get more leverage." Each broker independently checks margins. If any account is under-margined during peak margin snapshots, each broker gets penalized independently. This doesn't give you extra leverage — it multiplies your penalty risk.

What to Actually Do: A Practical Checklist for Intraday Traders

Before you place your first order:

• Confirm your broker's auto square-off time and penalty charges. Check the broker's support page — these policies change without notice.
• Ensure you have at least 20% more margin than the minimum required. This buffer absorbs intraday MTM fluctuations and prevents RMS-triggered square-offs.
• Maintain the 50% cash component if you're using pledged collateral. Set up a liquid fund or overnight fund for this purpose.

During the trading session:

• Set your own stop-loss. Never rely on auto square-off as your exit strategy — it executes at market price during the most volatile part of the session (3:15–3:20 PM).
• Monitor the margin utilization tab on your trading terminal. If utilization crosses 80%, reduce position size immediately.
• On expiry days (especially BANKNIFTY Thursday expiry), reduce position sizes by 30–40%. Bid-ask spreads widen, and brokers increase margin requirements.

After market close:

• Check your contract notes for STT charges, brokerage, and any penalty debits.
• Maintain a trade journal that tracks gross profit, all charges (brokerage, STT, GST, exchange charges, SEBI turnover fees), and net profit. Most traders who think they're profitable intraday are actually losing money after costs.
• Calculate your running turnover to monitor tax audit applicability.

For F&O traders specifically:

• Understand that selling options naked requires significantly higher margins (SPAN + Exposure + additional margins during high-VIX periods). During the March 2020 crash, margins on NIFTY options spiked 3x overnight. Your position can be squared off even before market opens if the margin requirement jumps based on updated SPAN files.
• Weekly options decay fastest on expiry day — but that's also when SEBI and broker-level margin rules are most restrictive. The theoretical edge and the practical execution don't always align.

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Navigating SEBI intraday trading margin rules and auto square-off time policies requires more than reading one article — it requires daily awareness of margin changes, volatility shifts, and broker policy updates. Platforms like MarketNetra are built to surface this kind of actionable intelligence — combining real-time market data with AI-driven analysis so you spend less time decoding circulars and more time making informed trading decisions. The rules won't get simpler, but your preparation can get sharper.