Options selling is usually described as selling a contract. What you actually sell is a promise: to buy or sell the underlying stock or index at a fixed price if the buyer asks. The premium is your fee for that promise, and you collect it upfront.
Your profit is capped at that fee; your loss is not. On NSE, the promise is enforced automatically at expiry.
What Is Options Selling?
Options selling, also called option writing, means opening a position by selling an option you do not hold. The buyer pays you a premium for a right, and you take on the matching obligation.
If you sell a call, you must sell the underlying at the strike price (the fixed price in the contract) when the buyer exercises. If you sell a put, you must buy at that price. If the buyer's side is new to you, start with call and put options.
Selling an option you already bought is "sell to close", a plain exit; only "sell to open" creates an obligation.
Also Read: To understand how calls and puts differ in terms of rights and obligations, read our guide to the Difference Between Call and Put Options.
How Option Selling in Stock Market Works
The premium is credited to your account, and your broker blocks margin: money held as security against losses. Exchange margin has two parts: SPAN (Standard Portfolio Analysis of Risk) margin, and exposure margin on top of it.
The amount is large because the contract is large. Under SEBI's October 2024 framework, index derivative contracts are sized at ₹15 lakh to ₹20 lakh. Margin also moves with volatility, so check the live figure on the margin calculator first.
Going Deeper: What Happens at Expiry
NSE options are European-style, so the buyer cannot exercise early. At the close on expiry day, every in-the-money option (one worth exercising) is exercised automatically and assigned at random to sellers of that contract.
Settlement differs: index options settle in cash. Stock options have been physically settled since the October 2019 expiry, so a sold stock call can end in share delivery. Since November 2024, short index options also attract an extra 2% extreme loss margin on their expiry day.
Types of Options Selling
The two basic types express opposite views. You sell a call when you expect the price to stay below the strike, and a put when you expect it to stay above. Alone, a sold call is a short call. A sold put alone is a short put.
Type | Setup | Your view | Maximum profit | Maximum loss |
Naked call | Sell a call only | Neutral to bearish | Premium | Unlimited |
Naked put | Sell a put only | Neutral to bullish | Premium | Strike minus premium |
Covered call | Sell a call on shares you own | Neutral to mildly bullish | Premium plus gain up to strike | Fall in shares, less premium |
Credit spread | Sell one option, buy a further one | Mildly directional | Net premium | Strike gap minus net premium |
A covered call caps your upside but does not protect the shares from a fall. A bull put spread, selling a put and buying a lower-strike put, is a common way to cap the loss.
Options Selling Examples
Both examples are illustrative, not live contracts.
Example 1: Selling a Call on a Stock
A stock trades at ₹1,000. You sell the ₹1,050 call at ₹20 on one lot (fixed contract quantity) of 1,500 shares, collecting ₹30,000, with breakeven at ₹1,070.
Below ₹1,050 at expiry, the call lapses and you keep the premium. At ₹1,150, you lose ₹80 per share, or ₹1,20,000 before costs, and must deliver 1,500 shares at ₹1,050. Each further ₹10 rise costs ₹15,000 more.
Example 2: Selling a Put on an Index, With Costs
An index stands at 25,000. You sell the 24,500 put at ₹100 on a lot of 65, collecting ₹6,500, with breakeven at 24,400. If the index closes at 24,000, you lose ₹26,000, settled in cash. On expiry day, the extra 2% margin on this lot is about ₹31,850.
Costs reduce the premium: at Indiabulls Securities, brokerage is 2.5% or ₹11 per executed order, whichever is lower, across NSE (CM, FO, CD), BSE (CM, FO) and MCX.
As on August 2026, Securities Transaction Tax (STT) is 0.15% of the premium under the Finance Act, 2026, about ₹10 here. Add ₹11 brokerage, the NSE transaction charge of ₹2.31 and 18% GST, per the Indiabulls Securities tariff, and you keep about ₹6,474 if the put expires worthless. Trivial once, ₹26 adds up across many trades.
When Options Selling Goes Wrong
Selling's payoff is lopsided: one large loss can erase many premiums, and it usually comes from:
• A gap move past your strike before you can exit
• Higher expiry-day margin as the trade turns against you
• A stock option settling in shares you must fund
• Charges on frequent trades eroding small gains
SEBI's study of FY25 to FY26, published in August 2026, found 87.7% of individual equity derivatives traders made net losses in FY26, about ₹91,685 crore in total. Before costs, 82.1% were loss-making, and options accounted for about 92% of losses. For stop-loss and sizing methods, see how to manage risk in option trading.
Is Options Selling Right for You?
Options selling suits traders who size each trade for the loss, not the premium. Before your first trade, ask three questions:
1. Can you fund the worst case, including expiry-day margin and a share delivery?
2. Have you priced brokerage, STT and charges into your breakeven?
3. Do you have a plan to exit before expiry day?
If any answer is no, start smaller or use a spread. Then check margin on the Margin Calculator and compare strike premiums on Option Chain before you trade.
Once you understand the risks and margin requirements, explore F&O Trading with IndiaBulls Securities to learn more about the available trading offering.
