What is Margin?
Margin is the deposit brokers require to hold leveraged positions. It can rise sharply into expiry or on gap moves against you.
Formula
Example: Buying $20,000 of Stock on 50% Margin Your Cash: $10,000 Broker Loan: $10,000 Total Position: $20,000 If stock rises 20%: Position Value: $24,000 Your Equity: $14,000 (40% return on your $10,000) If stock falls 20%: Position Value: $16,000 Your Equity: $6,000 (40% loss on your $10,000)
Indian market context (NSE)
Reference levels: Nifty 50 at 24,300, Reliance Industries at ₹1,300, Bank Nifty futures at 55,000 (lot size 30). Examples below show how Margin shows up on Indian index, equity, and futures books — update to live quotes in your journal.
Nifty 50 perspective
Margin on Nifty (24,300): define rupee risk per trade before the 9:15 open; index gaps on global cues can skip planned margin levels — use exchange-supported stop types and size for gap beyond stop.
Reliance Industries perspective
Margin for Reliance (₹1,300): stock circuits and 20% band limits can trap positions past your planned exit; keep margin outside circuit freeze zones where possible.
Bank Nifty futures perspective
Margin on Bank Nifty (55,000): span margin changes intraday — a valid margin at entry may be too large after a margin hike; recheck buying power before adding lots.
| Margin topic | Journal habit |
|---|---|
| Peak utilisation | Screenshot weekly |
| Expiry week | Reduce size rule |
| Short options | Max loss ₹ written pre-trade |
How to validate
- Validate Margin separately for index weeklies vs stock options.
- Stress-test with expiry-week and event-week subsets (RBI, budget, results).
- Confirm margin and tail-loss scenarios are logged for short premium books.
- Discard readings polluted by untagged discretionary adjustments.
How to track in TradeLyser
- Tag every leg: structure, DTE, moneyness, and whether Margin was a primary driver.
- Log planned max loss ₹ on entry for short premium strategies.
- Weekly: list open short ITM/ATM legs before expiry with a written roll/close rule.
- Separate F&O account tags from cash equity for Margin statistics.
Best practices
- Size Margin trades with margin headroom for gaps and assignment.
- Prefer defined-risk structures when learning a new options concept.
- Roll or close based on written DTE rules, not convenience.
- Keep weekly index and monthly stock books in separate tags.
Common pitfalls
- Short premium without defined max loss while Margin risk builds.
- Holding illiquid stock options into expiry without a plan.
- Blending index and stock gamma exposure in one tag.
- Ignoring margin spikes on gap opens.
How to use this in TradeLyser
Record margin % used on options entries. Flag trades opened above personal utilisation cap.
Related terms
A futures contract obligates parties to transact the underlying at settlement per NSE rules, with daily mark-to-market and margin.
Leverage means controlling larger notional than cash posted. F&O margin is a form of leverage with gap and margin-call risk.
Mark to market (MTM) is the daily revaluation of open derivatives positions against the exchange settlement or closing price, with profits credited and losses debited to your ledger. On NSE F&O, MTM runs on open futures and options positions so capital reflects current risk, not just entry price.
Position sizing translates account risk into quantity. With a ₹2,000 risk cap and ₹40 stop per share, size is 50 shares — before lot multiples on F&O.
Risk per trade is the planned loss at your stop — not the notional value of the position. A ₹10 lakh notional trade might risk only ₹3,000.
SPAN (Standard Portfolio Analysis of Risk) margin is the minimum margin NSE clearing requires to hold a derivatives portfolio, computed from scenario-based risk across price and volatility moves. It replaces fixed-percentage margin with a portfolio-aware number that can shrink when you hedge and expand when exposure concentrates.
FAQ
What does 50% margin mean?
50% margin means you can borrow 50% of the purchase price from your broker. To buy $10,000 worth of stock, you need $5,000 of your own money and borrow $5,000. This gives you 2:1 leverage—your gains and losses are doubled.
How much margin can I get?
Standard margin for stocks is 50% initial (Reg T). Day traders with pattern day trader status get 4:1 intraday buying power. Futures and forex offer higher margin, sometimes 20:1 or more. More margin means more risk.
What happens if I lose money on margin?
You owe the broker the borrowed amount regardless of your losses. If your position drops, you may get a margin call requiring additional funds. If you can't deposit more, the broker will force-sell your positions to cover the loan.
Is trading on margin a good idea?
Margin amplifies both gains and losses. It can boost returns if you're right but accelerate account destruction if you're wrong. Most retail traders should use minimal margin. Only experienced traders with proven strategies should consider margin.
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