Option Premium

The premium is the price paid to buy an option contract.

Common confusion

Time decay eats the premium daily; sellers collect it but take the risk.

Why it matters

It is the cost and the most you can lose as a buyer.

A real-world scenario

A trader buys a 60-day call for $4. The stock moves exactly as hoped, rising steadily — but slowly. By day 45 the option is worth $3.80 even though the stock is up, because time decay has eaten more than the price gain added. By expiry the option must be in the money by enough to justify its remaining value. The scenario is why option buyers race a clock: the stock can be right and the trade still lose, because every day the premium bleeds.

Worked example

How investors use it

As a buyer, treat the premium as the maximum you can lose and size accordingly. As a seller, understand that the premium is the payment for accepting real, potentially large risk — it is not free money.

Key takeaway

The premium is the price of an option, built from intrinsic value plus time value, and it is the most you can lose as a buyer. Time decay burns the premium every day, accelerating near expiry, which is why most bought options expire worthless even when the stock moves the right way. Sellers collect the decay but take the real risk. Size the premium cost, not the notional exposure, and remember the clock is always running against you.

Definitions reviewed by the Investing Glossary editorial team.