What Is Option Writing?
Option writing refers to selling an options contract to another party in exchange for collecting the option premium upfront. The option writer has an obligation: if the buyer exercises the option, the writer must fulfill the contract. Option writing is also called "option selling" and the seller is called the option writer.
How Option Writing Works
When you write a call option, you receive the premium immediately. If the underlying stock stays below the strike price by expiry, the option expires worthless, and you keep the full premium as profit. If the stock rises above the strike, the buyer exercises the option, and you must deliver shares or pay the difference.
- Call writing: Profit if stock price stays below the strike price at expiry.
- Put writing: Profit if stock price stays above the strike price at expiry.
- Maximum profit: Limited to the premium collected.
- Maximum loss: Theoretically unlimited for naked call writing; substantial for put writing.
Margin Requirements for Option Writing in India
SEBI requires option writers to maintain significant margin deposits because of their obligation. Margin for writing options is typically much larger than for buying options. For Nifty option writing, SPAN margin plus exposure margin can amount to Rs 80,000 to Rs 1,50,000 per lot depending on volatility. SEBI mandated collection of peak margin from option sellers, making it capital-intensive.
Why Traders Write Options
Option writing has a statistical advantage: studies show that a large percentage of options expire worthless, benefiting sellers. In Indian markets, writing OTM weekly Nifty or Banknifty options is a popular strategy. Sellers earn consistent small premiums by betting that the market will not move beyond their strike prices.
Risks of Option Writing
While premium collection is attractive, option writing carries tail risk: infrequent but potentially devastating losses. A sudden 5% Nifty move on an event day can result in a naked option writer losing 10x or more of the premium collected. Option writers must maintain strict stop-loss discipline and use hedged strategies like spreads to limit risk.
Key Takeaway
Option writing is a strategy that earns regular income through premium collection, favored by experienced traders who understand that most options expire worthless. However, the risks are asymmetric, and margin requirements in Indian markets are significant. Beginners should start with hedged writing strategies like credit spreads rather than naked option writing. Use the Lemonn app to track option premiums, margin requirements, and Greek values to trade responsibly in Indian F&O markets.
