What Is Option Premium?
Option premium is the price that the buyer of an options contract pays to the seller (writer) for the rights conveyed by the option. For a call option, the premium is paid to gain the right to buy the underlying asset at the strike price. For a put option, the premium gives the right to sell at the strike price. Premium is determined by market supply and demand and several quantitative factors collectively known as the options "Greeks." The premium represents the maximum loss for the option buyer and the maximum profit for the seller.
Components of Option Premium
- Intrinsic value: The immediate profit if the option were exercised right now. For an ITM call: Spot - Strike. For an OTM option: zero (no intrinsic value).
- Time value (extrinsic value): The additional premium above intrinsic value reflecting the probability that the option becomes more profitable before expiry. This decays to zero at expiry (theta decay).
Total Premium = Intrinsic Value + Time Value
Factors That Determine Option Premium
| Factor | Effect on Premium |
|---|---|
| Distance from strike (moneyness) | ITM options have higher premium than OTM |
| Time to expiry | More time = higher premium (more time value) |
| Implied volatility (IV) | Higher volatility = higher premium for both calls and puts |
| Interest rates | Minor effect; higher rates slightly increase call, decrease put premium |
| Dividends | Expected dividends reduce call premium, increase put premium |
Theta Decay: The Silent Premium Killer
Theta measures how much an option's premium decreases every day, holding all other factors constant. Theta accelerates as expiry approaches: an option with 30 days to expiry loses premium slowly initially, but in the last week before expiry, theta decay dramatically accelerates. For weekly Nifty options expiring on Thursday, options bought on Monday lose time value rapidly. This is why most options buyers lose money: they fight against theta decay every day.
Premium and Implied Volatility (IV)
When market uncertainty is high (pre-budget, pre-RBI policy announcement, earnings season), implied volatility spikes and options premiums inflate. After the event, IV crashes ("IV crush"), and option buyers who bought before the event may see premium collapse even if their directional view was correct. Understanding IV is critical for options trading success.
Key Takeaway
Option premium is the cost of the rights conveyed by the option; it consists of intrinsic and time value. Time value decays daily (theta), which works against option buyers but benefits option sellers. Understanding what drives premium helps traders make better entry decisions and evaluate risk-reward before placing options trades. Use the Lemonn app to track options chain premiums and volatility data for Indian markets.
