Intermediate · 7 min read

Margin and charges in Indian markets

Why sellers need margin, why costs matter more than most beginners expect, and where to check current rates.

Margin

Option buyers pay the full premium and need no margin. Option sellers must keep margin with the broker as a safety deposit, because their possible loss is much larger than the premium. Margin is based on how risky the position is (the exchange's span and exposure calculation), so it changes with the market. Hedged structures such as spreads and condors get lower margin than naked short options because their loss is capped.

• Intraday and overnight positions can have different margin requirements.
• Margin rises when volatility rises, even if you do nothing.
• Paper accounts here use estimates; your broker's calculator gives the real figure.

Transaction costs

Every trade carries costs: brokerage, the Securities Transaction Tax (STT) on certain sides, exchange transaction charges, SEBI turnover fees, stamp duty on the buy side, and GST on brokerage and some fees. Rates are set by the government, the exchange and your broker, and change from time to time, so check current rates with your broker.

• Costs are paid on every order, win or lose, so frequent trading and multi-leg strategies (which place several orders to enter and exit) add up.
• SEBI's own studies of individual derivatives traders found that costs took a large extra bite out of losses and a meaningful share of profits (see the last lesson).

Example: a four-leg iron condor places 4 orders to enter and 4 to exit. If each order costs ₹30 in charges, that is about ₹240 on a trade whose total profit potential might be only a few thousand rupees.

Caution. Always compare a strategy's maximum profit with its round-trip charges. A small edge can disappear after costs.