Premium (Options)

What it is

The premium is the price of an option — the upfront amount the buyer pays the seller (writer) to acquire the right (to buy via a call, or sell via a put) at the strike price. It's quoted per unit, so the total you pay is premium × lot size. For the buyer, the premium is the maximum possible loss; for the seller, it's the maximum possible profit (which they keep if the option expires worthless).

What drives it

An option's premium has two parts. Intrinsic value is how much the option is already in-the-money (e.g. a call's strike below the current price). Time value is everything else — the chance the option moves further into profit before expiry. Premium is driven mainly by: how far in/out of the money the strike is, time to expiry (more time = more premium), and implied volatility (higher expected swings = fatter premiums). The "Greeks" — delta, theta, vega — measure how the premium reacts to these factors.

In India

On NSE Nifty and Bank Nifty options, premiums fluctuate constantly through the session. They decay as expiry nears (time decay, or theta), which is why far-out-of-the-money options near expiry are cheap — and usually expire worthless. Premiums also spike when India VIX jumps around events like budgets and election results.

Common mistakes

Beginners buy cheap, far-out-of-the-money options because the premium is small, not realising the odds are heavily against them and theta erodes the premium daily even if their direction is right but slow. They also ignore implied volatility — buying options when IV is high means overpaying, and a volatility drop can crush the premium even if the price moves their way. Understand what you're paying for: a premium is the cost of *time and probability*, not a lottery ticket.