What is Assignment in Options? A Simple Guide

Assignment is the process by which an option seller is required to fulfil the contract when the buyer exercises. The seller of a call must deliver, and the seller of a put must buy, at the strike price. Assignment is the obligation side of options.

When you sell an option, you take on an obligation. Assignment is the moment that obligation becomes real. Every option seller needs to understand it.

Knowing how and when assignment happens helps you avoid surprises at expiry. Below, we break it down with plain examples and a clear payoff where it helps. You can trade and manage options on Stockk.

Key Takeaways

• Assignment is when a seller must fulfil the contract.
• It happens when the buyer exercises the option.
• A call seller delivers; a put seller buys.
• For European options, it happens at expiry.
• Sellers can avoid it by closing before expiry.

When does assignment happen?

For European-style options, which most Indian index and stock options are, assignment occurs at expiry if the option is in the money. The seller cannot choose; they are assigned automatically when the buyer's right is exercised. In-the-money options at expiry are exercised by the exchange on the buyer's behalf.

Say you sold one lot of a ₹1,200 stock call with a lot size of 500 shares, collecting a premium of ₹30 per share, or ₹15,000 in total. At expiry the stock closes at ₹1,260, so the call is ₹60 in the money and you are assigned. You must deliver 500 shares at ₹1,200 and receive ₹6,00,000, while those shares are worth ₹6,30,000. The ₹30,000 shortfall is offset by the ₹15,000 premium already collected, leaving a net loss of ₹15,000.

Why does assignment matter to sellers?

Assignment turns a seller's obligation into a real transaction. For stock options, this can mean delivering or receiving shares and needing full funds or stock. Sellers who do not want delivery must close positions before expiry.

Buyer vs seller at expiry

How to avoid unwanted assignment

The simplest way is to close your short option before expiry if it is in the money. This removes the obligation entirely. Traders who intend to take or give delivery should arrange full funds or shares in advance, since assignment carries real settlement consequences.

For hands-on futures and options, Stockk is built for Indian traders and backed by Indira Securities. A demat account is free, and there is plenty more in the Knowledge Center.

Futures and Options are leveraged products and carry a high risk of loss that can be more than the money you put in. This article is only for learning and is not a recommendation to trade in derivatives.

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