Short answer: An option premium is the upfront price a buyer pays to the seller for the right, but not the obligation, to buy or sell an underlying asset. It is set by adding two parts: intrinsic value, the amount the option would be worth if used right now, and time value, the extra amount buyers pay for the chance of a favourable price move before expiry.
Last reviewed: 6 November 2026
At a glance
| Term | What it means | Effect on premium |
|---|---|---|
| Intrinsic value | Spot price minus strike price for a call; strike minus spot for a put; negative results are zero | Higher when the option is in the money |
| Time value | The premium left after subtracting intrinsic value; also called extrinsic value | Erodes as expiry approaches |
| Time to expiry | The time remaining before the option expires | Longer time generally means a higher premium |
| Volatility | The expected size of price swings in the underlying asset | Higher volatility raises the premium |
| Black-Scholes model | The most widely used option pricing model | Takes inputs such as underlying price, strike, time, interest rate and volatility |
What does the premium pay for?
An option gives its holder a right, not a duty. A call option lets the holder buy the underlying asset at a fixed strike price, which is the agreed price written into the contract. A put option lets the holder sell at that strike price.
The premium is paid to the seller at the time of purchase, whether or not the option is ever used. Because the buyer can walk away, the premium is the most the buyer can lose. The seller keeps the premium regardless, but takes on the obligation to perform if the buyer exercises.
How is intrinsic value calculated?
Intrinsic value is the part of the premium that reflects what the option is worth if exercised at the current market price. The spot price is the current market price of the underlying asset.
For a call option, intrinsic value equals the spot price minus the strike price. For a put option, it equals the strike price minus the spot price. If the result is negative, intrinsic value is treated as zero, because no buyer would exercise an option at a loss.
How is time value found?
Time value is what remains after intrinsic value is subtracted from the total premium. It is sometimes called extrinsic value, since it comes from factors outside the current gap between spot and strike.
Time value reflects the chance that the price moves in the buyer’s favour before expiry. The more chance there is, the more buyers pay for it.
Hypothetical example (figures invented for illustration only): Suppose a call option has a strike price of 950 rupees, the spot price is 1,000 rupees, and the premium is 80 rupees. Intrinsic value is 1,000 minus 950, which is 50 rupees. Time value is the remaining 80 minus 50, which is 30 rupees.
Why does time value shrink as expiry nears?
Time value erodes as the expiry date approaches, so premiums generally fall as time runs out. With fewer days left, there is less opportunity for the price to move favourably.
This decay is not steady. It tends to speed up as expiry comes closer, which is one reason option buyers can lose value even when the underlying asset’s price does not move against them. The catch is that a buyer who waits for a move can find the time value gone before it arrives.
How do time to expiry and volatility affect the premium?
Options with a longer time to expiry generally carry higher premiums, because the underlying asset has more time to move favourably. Two options with the same strike price can therefore have very different premiums if their expiry dates differ.
Expected volatility also matters. Higher expected volatility in the underlying asset raises the premium, because larger price swings increase the chance of profit for the buyer. The same logic applies to the seller, who is compensated for taking on more risk when swings are expected to be large.
Why do in-the-money options cost more?
In-the-money options carry intrinsic value and generally have higher premiums. An option is in the money when exercising it right now would produce a gain before the premium is counted.
Out-of-the-money options have no intrinsic value. Their premium relies mainly on time value and on expectations about future price movement. They are usually cheaper in rupee terms, but they need a larger price move to become profitable for the buyer.
Where do pricing models fit in?
The Black-Scholes model is the most widely used option pricing model. It takes inputs such as the underlying price, the strike price, the time to expiry, the interest rate and volatility, and produces a theoretical premium from them.
A model’s output is only as good as its inputs. Volatility is an estimate of future price swings, not a known figure, so two traders using the same model can arrive at different premiums. The model describes how these factors combine; it does not predict where the market price will go.
What are the main risks?
The premium is the buyer’s maximum at-risk cost, but it can be the entire amount invested. If the option expires out of the money, it can become worthless and the full premium is lost.
For sellers, the risk runs the other way. The premium they receive is capped, but their potential obligation to deliver or pay under the contract is not capped in the same way. Understanding both sides of the contract is part of reading any option price.
Frequently asked questions
Is the option premium the same as the option’s price?
Yes, in ordinary usage the premium is the price paid for the option. It is paid upfront to the seller for the right, but not the obligation, to buy or sell the underlying asset.
Why can an option premium fall even if the stock price stays the same?
Time value erodes as the expiry date approaches, so premiums generally fall as time runs out. The fall can happen even when the underlying price does not move.
Does a higher premium mean the option is more likely to pay off?
Not necessarily. A higher premium can reflect in-the-money status, longer time to expiry or higher expected volatility. Each of these raises the premium for different reasons, and none guarantees a gain.
What is the most a buyer can lose on an option?
The buyer’s maximum at-risk cost is the premium, because the buyer may choose not to exercise the option. Losses beyond the premium do not arise for the buyer.
Sources and last check
Facts in this article were checked against the sources below on 6 November 2026. Rules and figures can change; check the primary source before acting.
- groww.in (broker education)
- kotakneo.com (broker education)
- upstox.com (broker education)
- dhan.co (broker education)
- icicidirect.com (broker education)
This article is general information, not investment advice. MyFinanceBandhu is not a SEBI-registered investment adviser.