Call vs Put Options: What They Are and When to Use Each

By Stephen Manning · @StephenCFU on X · 2025-06-25 · 11 min read

Call vs put options in plain English: a call is the right to buy, a put the right to sell. When to buy or sell each, with worked examples and the risks.

A call option gives you the right to buy 100 shares of a stock at a set price (the strike) on or before a set date (the expiration), and a put option gives you the right to sell them. Buy a call when you expect the stock to rise and a put when you expect it to fall or want protection. Sell covered calls on shares you own, or cash-secured puts on shares you want, when you would rather collect the premium than pay it.

What Are Calls and Puts in Trading?

An option is a contract on a stock or ETF, normally covering 100 shares. The buyer pays a price called the premium for the right, but not the obligation, to trade those shares at the strike price by the expiration date. The seller collects the premium and takes on the obligation: a call seller must sell the shares at the strike if assigned, and a put seller must buy them.

• Call: the right to buy. It gains value as the stock rises.
• Put: the right to sell. It gains value as the stock falls.
• Premium: quoted per share, so a $2.00 premium costs $200 for one contract.

Because one contract controls 100 shares for a fraction of their price, options give you leverage. That cuts both ways: a modest move in your favor can make the option worth far more than you paid, and a stock that goes nowhere can take all of it. If you are brand new, our guide to options trading for beginners in 2026 covers the basics before a first trade.

What Is a Call Option?

A call option gives the holder the right to buy shares at the strike price on or before expiration. Traders buy calls when they expect the stock to rise, and the most they can lose is the premium paid. Shareholders can also sell calls against shares they already own to collect premium. That is the covered call strategy, suited to flat or gently rising markets.

Beginner Example: Buying a Call

Imagine you buy a $50 call on XYZ, expiring in one month, for a $2 premium per share ($200 for one contract covering 100 shares). Your breakeven at expiration is $52: the strike plus the premium. If XYZ is at $60 at expiration, the call is worth $10 a share ($1,000). You can sell the contract for that value, or exercise it to buy 100 shares at $50 while they trade at $60. Either way, ($60 − $50) × 100 = $1,000, less the $200 premium, is an $800 net profit. If XYZ finishes at or below $50, the call expires worthless and you lose the $200 premium, your maximum risk. Anywhere between $50 and $52, you lose part of it.

A call that finishes $0.01 or more in the money is usually exercised automatically, and buying 100 shares at $50 takes $5,000 in the account. Know what happens when an option expires in the money before you hold one into the close.

Practical Steps to Trade Calls

1. Have a reason and a time frame: Choose a stock you expect to rise and know roughly when you expect the move. The call has to be worth more than you paid before it expires, not someday.
2. Read the options chain: Compare strikes, expiration dates and premiums. Favor contracts with high open interest and a tight bid-ask spread so you can get in and out at a fair price.
3. Paper trade first: Practice with simulated trades to see how price moves, volatility changes (vega) and time decay (theta) change the value of a call.
4. Size the trade: The premium is your maximum loss, so keep it to 1 to 2% of the account. Our guide to sizing your option trades shows the math.
5. Set your exit before you enter: Decide your profit target, and the point where you sell to cut the loss, before the trade goes on.

Common Mistakes When Buying Calls

• Buying far out-of-the-money calls because they are cheap, when they rarely finish in the money
• Underestimating time decay (theta), which accelerates as expiration approaches
• Ignoring implied volatility: premiums swell before earnings and other big events, then often deflate right after, so a call can lose value even when the stock moves your way

Selling Covered Calls on Shares You Own

If you own at least 100 shares, you can sell one call against them and collect the premium. Say you own 100 shares of XYZ at $52 and sell a $55 call for $1.50 ($150). If XYZ finishes below $55, the call expires worthless: you keep the $150 and the shares. If XYZ finishes above $55, your shares are sold at $55. You keep the $3 a share gain up to the strike plus the $150, but give up anything above $55. If XYZ falls, the call does not protect you: the $150 cushions only the first $1.50 of the drop, so a covered call carries nearly all the downside of owning the stock.

Bigger positions work the same way, one call per 100 shares. Say Mark, a long-term investor, holds 500 shares: he would sell five calls. If the stock surges past the strike, all 500 shares are called away and the gain above the strike goes to the buyer, which is why the strike should be a price you would be happy to sell at.

When the stock runs through your strike before expiration, you can let the shares go, buy the call back, or roll it once to a later date. Our rule at CFU is one roll and done, or none: if a rolled call is threatened again, close the trade rather than roll a second time. Our guide to managing a stock above your covered call strike walks through each choice. To see one call for a stock you already own, the free CFU Covered Call Scanner shows the strike, expiry and premium at the bid.

What Is a Put Option?

A put option gives the holder the right to sell shares at the strike price on or before expiration. Buying a put lets you profit from a falling stock or insure shares you own against a drop, and the most you can lose is the premium. Selling a put is the other side: you collect the premium and agree to buy 100 shares at the strike if assigned. With the cash set aside, that is a cash-secured put, a way to be paid while you wait to buy a stock you want. It is not defined risk: if the stock collapses you still buy at the strike, so the worst case is the strike less the premium, times 100.

Beginner Example: Buying a Put

Suppose you buy a $50 put on XYZ for $3 per share ($300 for one contract). Your breakeven at expiration is $47: the strike minus the premium. If XYZ is at $40 at expiration, the put is worth $10 a share ($1,000). Most traders simply sell the put at that point. Exercising it sells 100 shares at $50, which works if you own them and otherwise opens a short stock position. Either way, the $1,000 less the $300 premium is a $700 net profit. If XYZ stays at or above $50 at expiration, the put expires worthless and you lose the $300 premium, your defined risk.

Protecting Shares You Own with Puts

1. Review your portfolio: Identify holdings exposed to a near-term drop, such as an earnings report, sector trouble or a big macro event.
2. Buy protective puts: One put per 100 shares sets a floor at the strike for as long as the put is open.
3. Weigh the cost: The premium is the price of the insurance. Closer strikes and longer dates cost more, so decide how much protection is worth paying for over your time frame.
4. Manage the hedge: As the stock falls, the put gains value. Decide in advance whether you will sell the put to take that gain, hold it to expiration, or buy new protection when it runs out.

Example: Hedging a Position Before a Big Event

Say Susan owns 100 shares of TechX at $100 heading into a Federal Reserve announcement. She buys one $95 put for $4 ($400). If TechX falls to $87, her shares lose $1,300, but the put is worth at least $8 a share ($800), so her net loss is no more than $900, instead of $1,300. That $900 is also her worst case while the put is open: $5 a share down to the strike plus the $400 premium. If TechX rallies instead, the put expires worthless and the $400 was the cost of the insurance.

Bear Put Spreads: Cheaper Downside

A bear put spread cuts the cost of a put by selling a lower-strike put against it. For example, buy a $50 put and sell a $45 put with the same expiration for a net $2.00 ($200). The $200 is your maximum loss, your maximum gain is the $5 width minus the $2 cost ($300), and your breakeven at expiration is $48. It suits an expected moderate drop: you give up any gain below $45 in exchange for a cheaper position with both outcomes defined. When implied volatility is high and single puts are expensive, a spread is also a cheaper way to buy protection.

When to Use Call Options

Calls fit when you expect a rise, or when you own shares and would be willing to sell them at a higher price.

• A move with a catalyst and a deadline: Earnings, a product launch or an analyst upgrade can lift a stock, but premiums are usually inflated going in, so the move has to beat what the premium already prices in.
• Leverage with a capped loss: You control 100 shares for a fraction of their cost and can lose no more than the premium, though losing all of it is common when the move comes late.
• Premium on shares you own: Sell a covered call in a flat or slowly rising market, at a strike where you would be content to sell.

When to Use Put Options

Puts fit when you expect a fall, want insurance on shares you own, or want to be paid while you wait for a lower entry price.

• Expecting a decline: Buy a put, or a bear put spread for a moderate drop, and only with money you can afford to lose in full if the drop comes late.
• Protecting a holding: Buy one protective put per 100 shares before an event that could hurt the stock, and treat the premium as an insurance cost.
• Buying a stock you want for less: Sell a cash-secured put at a strike you would happily pay. If assigned, your cost is the strike minus the premium; if not, you keep the premium. Our guide to getting paid to buy stocks at a discount covers it step by step, and the free CFU Cash-Secured Put Scanner shows what the put side looks like on a ticker you want to own.

Call or Put? How to Choose

Start with your outlook, then decide whether you want to pay premium (buy) or collect it (sell).

At Cash Flow University, every trade alert is posted in real time with the risk stated, and every closed trade goes into our audited record, so you can see the trades, the reasoning behind them and the results before you risk your own money.

Calls and Puts FAQ

When should you buy a call or a put?

Buy a call when you expect the stock to rise by more than the premium before expiration, and buy a put when you expect it to fall by more than the premium or want to protect shares you own. Timing matters as much as direction, because the move has to happen before the option expires.

Is it better to buy or sell options?

Neither is better in every case. Buyers pay the premium, can lose no more than that, and need a big enough move soon enough to beat time decay. Sellers collect the premium and profit if the stock stays on the right side of their breakeven (the strike adjusted by the premium), but they take on an obligation: a covered call or cash-secured put carries most of the downside of owning the stock, which is why sellers size small and often use spreads to define the risk.

What happens to a call or put at expiration?

An option that finishes out of the money expires worthless: the buyer loses the premium and the seller keeps it. An option that finishes $0.01 or more in the money is usually exercised automatically, so a long call buys 100 shares at the strike and a long put sells 100 shares at the strike, while the seller on the other side is assigned. Many traders close before the final bell to avoid that, and our guide to what happens when an option expires covers the details.

Filed under: Options Basics, Covered Calls

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