Call Option Basics: Break-Even, Maximum Loss, and Payoff at Expiration
October 29, 2026
A call option gives the buyer the right, but not the obligation, to buy 100 shares at a fixed strike price on or before the expiration date. The buyer pays a premium up front. If the stock rises above the strike by more than the premium, the option makes a profit; otherwise, the buyer's loss is limited to the premium paid.
Example: a stock trades at $100. You buy a call with a strike of $105 for a premium of $3 per share. One contract covers 100 shares, so you pay $300. Break-even at expiration = strike + premium = $105 + $3 = $108.
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Profit per share = max(stock price − strike, 0) − premium. At $95 or $105, the option expires worthless (the call is out of the money or at the money), and the loss is the whole $3 per share, $300 per contract. At $108, the profit is zero. At $115: $10 − $3 = $7 per share, $700 per contract, a 233% return on the $300 premium. At $125: $20 − $3 = $17, or $1,700, a 567% return. The upside is unlimited in theory, while the maximum loss is the premium. Compare with buying 100 shares at $100 ($10,000): the stock gains $1,500 at $115, a 15% return, but loses $1,000 at $90, whereas the option loses only $300.
| Stock price at expiration | Profit per share | Profit per contract | Return on $300 premium |
|---|---|---|---|
| $95 | -$3 | -$300 | -100% |
| $105 | -$3 | -$300 | -100% |
| $108 | $0 | $0 | 0% |
| $115 | +$7 | +$700 | +233% |
| $125 | +$17 | +$1,700 | +567% |
Time Decay and Probability
An option's price includes time value, which decays as expiration nears, accelerating in the last weeks. The stock has to move enough and soon enough. In this example, the stock must rise 8% to reach break-even, and options expire worthless a large share of the time. Implied volatility also matters: when volatility drops, option prices fall even if the stock price stays still. Before buying, check the probability of reaching the break-even price, which options calculators estimate from implied volatility.
Put Options Mirror the Idea
A put gives the right to sell at the strike. A $95 put costing $2.50 has a break-even of $95 − $2.50 = $92.50 and a maximum loss of $250, with profit increasing as the stock falls. Puts are used to speculate on declines or to insure a stock position. Covered calls (selling calls against shares you own) earn the premium but cap your upside.
Risk Warning
Options are leveraged and complex; many buyers lose their entire premium. Selling uncovered options can lead to losses greater than the amount invested. In the US, brokers require approval levels and a risk disclosure. This article is an educational illustration, not investment advice.
Frequently Asked Questions
What is the break-even price for a long call?
Strike price plus the premium paid.
What is the most I can lose buying a call?
The premium paid.
How many shares does one contract cover?
Usually 100.
What is time decay?
The loss of an option's time value as expiration approaches.
Are options suitable for everyone?
No. They are complex and risky.