An option premium is the per-share price you pay to buy an options contract or collect when you sell one, and because each standard U.S. equity option covers 100 shares, a premium quoted at $3.50 means $350 in actual cash.1The Options Clearing Corporation. Equity Options – OCC For the buyer, that payment is nonrefundable and represents the absolute maximum that can be lost on the trade. For the seller, it is compensation for taking on an obligation that can cost far more than the premium itself.
Every quoted premium breaks into two pieces, and every change in that premium during the life of the contract traces back to a handful of measurable forces. Knowing which piece you are paying for, and which force is pushing the price around, is the difference between buying an option intentionally and buying one on hope.
Intrinsic Value and Extrinsic Value
Intrinsic value is what the option would be worth if you exercised it right now. A call with a $50 strike price while the stock trades at $55 has $5 of intrinsic value per share. A put with a $60 strike when the stock sits at $52 has $8. If the strike is worse than the current stock price, the option is “out of the money” and intrinsic value is zero.
Extrinsic value is everything else in the premium. If that $50 call trades at $7.50 while the stock is at $55, then $5 is intrinsic and the remaining $2.50 is extrinsic. That portion reflects the time left before expiration and the market’s forecast of how much the stock might move. An out-of-the-money option is 100% extrinsic value: you are paying entirely for possibility, with no built-in profit backing the price.
The split matters when you evaluate a trade. A premium that is mostly extrinsic requires a bigger stock move just to break even, and if $7.50 of a $7.50 premium is extrinsic, the entire amount evaporates if the stock does not move before expiration.
What Moves the Premium
Premiums shift throughout the life of a contract based on several forces. Traders track each one through a sensitivity metric known as a “Greek,” and the three that matter most to anyone pricing a trade are Delta, Theta, and Vega.
Stock Price Movement
Delta tells you how much the premium changes when the underlying stock moves $1. A call option with a Delta of 0.50 gains roughly $0.50 per share for each $1 the stock rises. Deep in-the-money calls have Deltas approaching 1.00, moving nearly dollar-for-dollar with the stock. Far out-of-the-money calls have Deltas close to zero and barely react to small moves.
Puts work in reverse. A put with a Delta of −0.40 gains $0.40 per share for each $1 the stock falls. Delta itself shifts as the stock price changes, which is why an option that barely moved all month can suddenly come alive once the stock crosses the strike.
Time Decay
Every day that passes erodes extrinsic value. Theta quantifies this daily drain. An option with a Theta of −0.05 loses about $0.05 per share each day, all else equal. The decay is not linear. It accelerates sharply in the final 30 days before expiration, which makes short-dated options especially punishing for buyers who need the stock to move quickly.
For sellers, Theta runs the other way. Each passing day transfers a small slice of premium from the buyer’s account toward the writer’s, even if the stock does nothing at all.
Implied Volatility
Implied volatility is the market’s collective forecast of how much a stock might swing before expiration. Higher implied volatility raises premiums for both calls and puts, because bigger potential moves make the contract more valuable to the buyer and riskier for the seller. This is why premiums often spike ahead of earnings announcements or FDA decisions. Uncertainty itself has a price.
Vega measures how sensitive the premium is to a one-percentage-point change in implied volatility. An option with a Vega of 0.15 gains roughly $0.15 per share if implied volatility rises from 30% to 31%. The practical trap: if you buy options when volatility is already elevated and the stock makes the move you expected while implied volatility falls at the same time, you can still lose money. Traders call this getting “vol crushed.”
Interest Rates
Rho measures sensitivity to interest rates. Rising rates push call premiums slightly higher and put premiums slightly lower. A call with a Rho of 0.45 would gain about $0.45 per share if interest rates jumped a full percentage point.2The Options Industry Council. Rho Rho matters most for long-dated options. For short-dated weekly contracts, interest rate changes barely register.
Who Pays the Premium and Who Collects It
Every option trade has a buyer (the holder) and a seller (the writer). The buyer pays the premium to gain the right to buy shares at the strike price with a call, or sell shares at the strike price with a put, without any obligation to follow through. If the trade does not work, the buyer walks away and the premium is the total loss.
The writer collects the premium in exchange for accepting an obligation. If the buyer exercises, the call writer must deliver shares at the strike price, and the put writer must purchase shares at the strike price, regardless of where the market sits.3FINRA.org. Investment Products A buyer’s loss is capped at the premium paid. A writer’s potential loss on an uncovered position can run far above what was collected.
Once the trade executes, the premium belongs to the writer permanently. The buyer cannot recover it, even if the option expires worthless the next day.
When the Cash Actually Moves
The Options Clearing Corporation acts as the central counterparty for every listed option trade, guaranteeing both sides fulfill their obligations.4The Options Clearing Corporation. Clearance and Settlement When you buy an option, the premium is debited from your brokerage account. When you sell one, it is credited. Since May 28, 2024, options premiums settle on a T+1 basis, so the cash moves one business day after the trade date.5The Options Industry Council. The Impact of T+1 on Options
Commissions reduce what sellers pocket and add to what buyers pay. Charles Schwab charges $0.65 per contract.6Charles Schwab. Pricing Interactive Brokers charges $0.25 to $0.65 depending on premium level and monthly volume.7Interactive Brokers LLC. Commissions Options Some brokers, including Robinhood and Webull, charge no per-contract fee, though exchange and regulatory fees still apply. Before you can trade options at any broker, you must receive a copy of the “Characteristics and Risks of Standardized Options” disclosure document, as required under SEC Rule 9b-1.8The Options Clearing Corporation. Characteristics and Risks of Standardized Options
What Happens to the Premium at Expiration
If your option is in the money by at least $0.01 per share at expiration, the OCC automatically exercises it through a process called “exercise by exception.”9The Options Industry Council. Options Exercise A call means you buy 100 shares at the strike. A put means you sell 100 shares. You can override the automatic process by giving your broker explicit instructions before the cutoff, but exercise is the default.
If the option expires out of the money, it becomes worthless. For the buyer, the premium paid is a complete loss. For the writer, this is the best-case outcome: the premium is fully earned with no further obligation.
How the Premium Is Taxed
How the IRS treats your premium depends on what happens to the contract, and the rules differ for buyers and sellers.
For buyers, selling the option before expiration produces a capital gain or loss equal to the difference between what you paid and what you received. If the option expires worthless, the premium becomes a capital loss, and the expiration date is treated as the sale date. If you exercise a call, the premium does not create a separate taxable event. It gets added to the cost basis of the shares you acquire. For exercised puts, the premium reduces your sale proceeds on the underlying shares.10Office of the Law Revision Counsel. 26 USC 1234 – Options to Buy or Sell
For writers, premiums collected are not taxed when received. If the option expires worthless, the premium becomes a short-term capital gain regardless of how long the contract was open. If the writer closes the position with a buyback, any gain or loss is also short-term.10Office of the Law Revision Counsel. 26 USC 1234 – Options to Buy or Sell
Non-equity options, including most index options, follow a separate regime under Section 1256. Gains and losses on these contracts are automatically split 60% long-term and 40% short-term, no matter how briefly you held the position.11Office of the Law Revision Counsel. 26 USC 1256 – Section 1256 Contracts Marked to Market That blended rate can produce a meaningful tax advantage for active index option traders.
The wash sale rule also reaches options. If you sell a stock at a loss and buy a call on the same stock within 30 days before or after the sale, the IRS disallows that loss. The statute specifically defines “stock or securities” to include contracts and options to acquire or sell stock.12Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities The disallowed loss is not gone. It gets added to the cost basis of the replacement position, but it can disrupt your tax planning if you are not tracking it.