An option premium is the price you pay to buy an options contract. It’s the total cost per share that a buyer pays to the seller (called the “writer”) in exchange for the right to buy or sell a stock at a specific price by a certain date. If you buy one standard options contract covering 100 shares and the premium is $3.00 per share, you pay $300 upfront. That money belongs to the seller immediately, whether you ever use the contract or not.
The Two Parts of Every Premium
Every option premium is made up of two components: intrinsic value and extrinsic value. Understanding this split tells you exactly what you’re paying for.
Intrinsic value is the real, built-in profit an option would have if you exercised it right now. For a call option (the right to buy), intrinsic value is the difference between the current stock price and the strike price, but only when the stock is trading above the strike. If a call option has a strike price of $20 and the stock is at $22, the intrinsic value is $2. For a put option (the right to sell), intrinsic value exists when the stock trades below the strike price. If the option has no built-in profit at the moment, its intrinsic value is zero.
Extrinsic value is everything else in the premium beyond intrinsic value. It reflects the possibility that the option could become more valuable before it expires. Using the example above, if that call option with $2 of intrinsic value is actually trading at $2.50, the extra $0.50 is extrinsic value. This portion is driven mainly by two things: how much time remains until expiration, and how volatile the underlying stock is expected to be. Traders often call extrinsic value “time value,” because it shrinks as expiration approaches.
Options that are “out of the money,” meaning they have no intrinsic value, are priced entirely on extrinsic value. A deep out-of-the-money option expiring in one trading day is typically worth close to $0, because there’s almost no time left for the stock to move enough to make the contract profitable.
What Drives the Premium Higher or Lower
Four main factors determine how much an option premium costs at any given moment.
Underlying Stock Price
As the stock price rises, call option premiums increase and put option premiums decrease. As the stock price falls, put premiums increase and call premiums decrease. This is the most intuitive factor: a call option becomes more valuable when the stock moves toward or past the strike price, because the right to buy at a fixed lower price is worth more.
Strike Price and Moneyness
Moneyness describes how far the current stock price is from the option’s strike price. The deeper an option is “in the money” (meaning it already has intrinsic value), the higher its premium. The further it is “out of the money,” the cheaper it becomes, because the stock needs a bigger move to make the contract worthwhile. An at-the-money option, where the stock price and strike price are roughly equal, sits in the middle and tends to have the most extrinsic value relative to its total premium.
Time to Expiration
More time until expiration means a higher premium. An option expiring in six months gives the stock more runway to move in your favor compared to one expiring next week, so buyers pay more for that extra time. As expiration approaches, this time component of the premium steadily erodes, a process called time decay (sometimes labeled “theta” on a trading platform). The rate of decay accelerates as the option nears its expiration date, particularly in the last 30 days. An option that loses $0.02 per day with three months left might lose $0.10 per day in its final week.
Implied Volatility
Implied volatility reflects how much the market expects the stock price to swing in the future. When implied volatility rises, perhaps ahead of an earnings report or during broader market turbulence, option premiums increase for both calls and puts. When volatility drops, premiums shrink. This is why you’ll sometimes see an option lose value even when the stock moves in your favor: if implied volatility fell at the same time, the decline in extrinsic value can offset the gain in intrinsic value.
Who Pays and Who Collects
The buyer pays the premium. The seller (writer) collects it. This exchange happens as soon as the trade executes, and the premium is nonrefundable. If you buy a call option for $3.00 per share and the stock never reaches your strike price, you lose that $300 per contract. The seller keeps it as profit.
This dynamic creates two fundamentally different risk profiles. Buyers have limited risk: the most they can lose is the premium they paid. Sellers, on the other hand, collect the premium upfront but take on the obligation to deliver shares (for a call) or buy shares (for a put) if the buyer exercises the contract. If a written option expires out of the money, meaning the stock price closed below the strike for a call or above it for a put, the writer keeps the entire premium with no further obligation. That outcome is the best-case scenario for the seller and the worst case for the buyer.
A Walk-Through Example
Say a stock is trading at $50 and you buy a call option with a $48 strike price expiring in 60 days. The premium is quoted at $4.00 per share, so you pay $400 for one contract (100 shares). Here’s how the premium breaks down:
- Intrinsic value: $2.00 (the stock at $50 minus the $48 strike price)
- Extrinsic value: $2.00 (the remaining premium, reflecting 60 days of time and current implied volatility)
If the stock stays at $50 and nothing else changes, that $2.00 of extrinsic value will gradually erode as expiration approaches. With 30 days left, the premium might be $3.00. With five days left, it might be $2.20, nearly all intrinsic value. If the stock drops to $47, the option has zero intrinsic value, and the premium might fall to $0.80 or less, depending on how much time and volatility remain.
On the other hand, if the stock jumps to $58, the intrinsic value alone is $10, and the total premium would be even higher if time and volatility add extrinsic value on top. You could sell the option at that point for a profit without ever exercising it, which is what most options traders do.
Why Premium Size Matters for Your Strategy
The premium you pay sets your breakeven point. For a call option, your breakeven at expiration is the strike price plus the premium. In the example above, that’s $48 + $4.00 = $52. The stock has to rise above $52 for you to profit at expiration. For a put option, the breakeven is the strike price minus the premium.
Cheaper premiums mean a lower upfront cost but usually reflect a lower probability that the option finishes in the money. Expensive premiums give you a higher-probability contract but require a larger move just to break even. Sellers think about this in reverse: higher premiums mean more income collected, but they come with greater risk because the option is more likely to be exercised against them.
When comparing options on the same stock, looking at the premium breakdown helps you understand what you’re actually paying for. If most of the premium is extrinsic value, you’re essentially betting on a future move and paying for time. If most is intrinsic value, you’re buying an option that already has real worth but costs more upfront. Neither is inherently better. The right choice depends on how much the stock needs to move, how quickly you expect it to happen, and how much capital you’re willing to put at risk.