Call vs Put Options: What's the Difference?

Key takeaways

• A call option gives the right to buy the underlying asset; a put option gives the right to sell it, both at the strike price on or before expiration.
• The option buyer's maximum loss, for either type of contract, is limited to the premium paid.
• Writing (selling) an option earns premium income up front but carries assignment risk.
• Time decay (theta) steadily reduces an option's value as expiration approaches.
• Implied volatility directly affects the size of the premium.
• Call and put positions can receive different US tax treatment, depending on how the position is closed. 

What are call and put options?

A call option is a contract that gives the holder the right, but not the obligation, to buy an underlying asset at a fixed strike price on or before expiration; a put option gives the same right to sell.

Both are derivative contracts: their value is derived from the price of an underlying security, most often a stock, an exchange-traded fund, or an index. A standard listed options contract covers 100 shares of the underlying stock, so the price quoted for a single option is generally multiplied by 100 to reach the total premium.

Exercise style also matters. American-style options, the most common type on individual US stocks, can be exercised on any trading day up to and including the expiration date. European-style options, common on many index products, can only be exercised on the expiration date itself.

Before an account can trade options, brokers generally require a documented approval process similar to the one set out by FINRA, designed to confirm that a trader understands the mechanics and risk involved. An "opening transaction" establishes a new position, either by buying or writing (selling) an option; a "closing transaction" ends that position, whether through exercise, expiration, or an offsetting trade in the market.

A contract's moneyness describes the relationship between the underlying asset's current price and the strike price, and this relationship flips between calls and puts:

Source: Theocc

How do call options work?

The buyer of a call option pays a premium for the right to purchase the underlying asset at the strike price, and profits once the underlying rises above the strike price plus the premium paid, before expiration.

At expiration, a call buyer's position falls into one of three outcomes:

1. Underlying above breakeven (strike + premium): the option can be exercised or the contract sold for a profit.
2. Underlying above the strike price but below breakeven: exercising reduces the loss, though the position remains below breakeven overall.
3. Underlying at or below the strike price: the option expires worthless, and the buyer's loss is capped at the premium paid. The premium is the buyer's maximum possible loss on the position.

Call option example

Stock ABC trades at $50. A trader buys one call option contract with a $50 strike price and a $3 premium per share. Since one contract covers 100 shares, the total premium paid is $300 ($3 x 100 shares).

• Breakeven point: $50 strike + $3 premium = $53 per share.
• If ABC rises to $60 before expiration, the intrinsic value is $10 per share ($60 − $50), producing a profit of $7 per share ($10 − $3 premium), or $700 in total ($7 x 100 shares).
• If ABC stays at or below $50 through expiration, the option expires worthless, and the trader's loss is the full $300 premium paid, no more.

Covered vs Naked calls

Writing (selling) a call option works in the opposite direction: the writer collects the premium up front but takes on the obligation to deliver the underlying asset if the buyer exercises. A covered call is written against shares the writer already owns, which caps the potential loss to the difference between the stock's purchase price and the strike price. A naked call is written without owning the underlying asset, and since a stock's price has no fixed ceiling, the writer's potential loss is theoretically unlimited.

How do put options work?

The buyer of a put option pays a premium for the right to sell the underlying asset at the strike price, and profits once the underlying falls below the strike price minus the premium paid, before expiration.

At expiration, a put buyer's position falls into one of three outcomes:

1. Underlying below breakeven (strike − premium): the option can be exercised or the contract sold for a profit.
2. Underlying below the strike price but above breakeven: exercising reduces the loss without reaching profit.
3. Underlying at or above the strike price: the option expires worthless, and the buyer's loss is capped at the premium paid.

Because a put option gains value as the underlying falls, an investor who already holds a stock can buy a put as a protective hedge: if the share price drops, gains on the put option can offset losses on the stock position.

Put option example

Stock XYZ trades at $80. A trader buys one put option contract with a $75 strike price and a $4 premium per share, for a total premium of $400 ($4 x 100 shares).

• Breakeven point: $75 strike − $4 premium = $71 per share.
• If XYZ falls to $65 before expiration, the intrinsic value is $10 per share ($75 − $65), producing a profit of $6 per share ($10 − $4 premium), or $600 in total.
• If XYZ stays at or above $75 through expiration, the option expires worthless, and the trader's loss is the full $400 premium paid.

Call vs Put options: What's the difference?

The core difference is direction: a call is a right to buy, reflecting a bullish view on the underlying, while a put is a right to sell, reflecting a bearish view. Everything else about the two contracts, including how profit is calculated and where the breakeven point sits, follows from this single distinction. The table below lines up both contract types side by side.

Source: Theocc

Direction

A call is bought or written on the expectation that a stock will rise; a put is bought or written on the expectation that it will fall. This is the single variable that determines which contract fits a given trade.

Market conditions

Calls tend to gain value in a rising, or bullish, market, while puts tend to gain value in a falling, or bearish, market. Rising implied volatility increases the premium of both contract types, since it raises the probability, priced in by the market, that the underlying moves far enough to become profitable before expiration.

Risk and reward

For a buyer of either contract, the risk is defined and limited to the premium paid, while the reward differs: a call buyer's gain has no theoretical ceiling, since a stock's price can keep rising, while a put buyer's gain is capped once the underlying reaches $0. For a writer, the position is reversed: the reward is capped at the premium collected, while the risk on an uncovered call can be unlimited.

Breakeven

A call's breakeven point is the strike price plus the premium paid; the underlying needs to clear that level for the buyer to turn a profit. A put's breakeven point is the strike price minus the premium paid; the underlying needs to fall below that level instead.

Buying vs Writing (Selling) options

Every options contract has two sides, and each one carries a different obligation. The buyer pays a premium for a right; the writer collects that premium in exchange for an obligation to perform if the buyer exercises.

The Option Buyer

The buyer's risk is defined and known in advance: it is capped at the premium paid, no matter how far the underlying moves against the position. In exchange for that limited downside, the buyer has no obligation to exercise, and can simply let the contract expire if the trade does not work out, or sell the contract itself before expiration to recover part of the premium.

The Option Writer

The writer's risk profile is the reverse, and in the case of uncovered positions, undefined: the writer collects the premium immediately, but is obligated to buy or sell the underlying at the strike price if the buyer chooses to exercise, a scenario known as assignment. A covered position, where the writer already holds an offsetting stake in the underlying, limits this risk to a known range. An uncovered, or naked, position leaves the writer exposed to a move in the underlying with no matching offset, which is why brokers apply stricter approval requirements to naked option writing.

When should you use a call vs a put?

The choice between a call and a put comes down to three decision points: the trader's market outlook, their risk tolerance, and what they are trying to achieve with the position.

By market outlook

A bullish outlook, where the underlying is expected to rise, typically points to buying a call or writing a covered call for income. A bearish outlook, where the underlying is expected to fall, typically points to buying a put, either to speculate on the decline or to hedge an existing long position.

By risk tolerance

Buying either a call or a put keeps risk defined at the premium paid, which suits a trader who wants a known maximum loss. Writing options, particularly uncovered positions, shifts the risk profile toward the writer and requires a higher risk tolerance, since a naked call in particular carries theoretically unlimited exposure.

Selling a put vs Buying a call

Both a cash-secured put sale and a long call reflect a bullish view, but they behave differently. Selling a put earns premium immediately and can still profit if the underlying stays flat or rises only modestly, though the seller takes on the obligation to buy the stock at the strike price if it is assigned. Buying a call needs a stronger move in the underlying to become profitable, since it must clear the breakeven point, but the position's loss is capped at the premium paid rather than tied to the full strike price. As with any leveraged instrument, the specific numbers depend on the strike, premium and time to expiration chosen for a given trade, and should be worked through case by case rather than assumed.

Applications: Hedging, speculation and income

Hedging: a protective put, bought against a stock already held, offsets losses if the price falls; the key risk is that the premium paid reduces overall returns if the hedge turns out not to be needed.

Bullish speculation: buying a call lets a trader benefit from a price rise with a defined maximum loss; the key risk is losing the entire premium if the underlying does not move as expected before expiration.

Bearish speculation: buying a put lets a trader benefit from a price decline with a defined maximum loss; the key risk is the same total-premium loss if the underlying does not fall in time.

Key risks of options trading for new traders

Options carry a distinct set of risks beyond those of holding a stock outright. The five most common are set out below.

• Time decay (theta): an option loses extrinsic value every day that passes, all else being equal, which works against a buyer holding a position and in favour of a writer.
• Implied volatility (IV) crush: a sharp drop in implied volatility, common right after events such as earnings releases, can reduce an option's premium even when the underlying moves in the expected direction.
• Total premium loss: a buyer who holds to expiration with the underlying on the wrong side of the strike price loses the entire premium paid.
• Liquidity risk: contracts with wide bid-ask spreads or low open interest can be difficult to close at a fair price, which adds a hidden cost to entering and exiting a position.
• Assignment risk: a writer of an option, particularly one that is in the money, can be assigned at any time in the case of American-style contracts, forcing an unplanned trade in the underlying.

These risks can be reduced, though not eliminated, in three main ways:

1. Size positions deliberately: limiting the premium committed to any single trade keeps a total-loss outcome manageable.
2. Favour liquid contracts: options on actively traded underlyings, with tight bid-ask spreads, are easier to close before expiration if a position needs to change.
3. Track time to expiration: since time decay accelerates as expiration nears, monitoring the calendar helps a trader decide when to close, roll, or let a position run.

Options Clearing Corporation (OCC)

The Options Clearing Corporation, the clearing house that guarantees the performance of every listed US options contract, frames the buyer-writer relationship as the starting point for understanding options risk: an option holder looks to the OCC system, rather than to any individual counterparty, for performance of the contract, while every option writer takes on a matching obligation within that same system. Its investor disclosure document, which US brokers are required to provide before an account can trade listed options, sets out this defined-risk-for-buyers, obligation-for-writers structure in detail.

How are call and put options taxed?

The following six scenarios summarise how US retail investors are generally taxed on equity options; a tax professional should be consulted for guidance specific to an individual's situation.

1. Selling a long option before expiration generally produces a short-term or long-term capital gain or loss, depending on the holding period.
2. Letting a long option expire worthless produces a capital loss equal to the premium paid.
3. Exercising a call option adds the premium paid to the cost basis of the shares acquired.
4. Exercising a put option reduces the sale proceeds of the shares sold by the premium paid.
5. Premium collected from writing an option that later expires or is bought back is generally treated as a short-term capital gain.

Certain index options and other Section 1256 contracts receive an automatic 60/40 long-term/short-term split regardless of how long the position was held (IRC Section 1256; IRS Form 6781 instructions and Publication 550, 2025 edition).

Final thoughts: Choosing between calls and puts

The choice between a call and a put ultimately comes back to direction, purpose, and risk tolerance: what the underlying is expected to do, why the position is being opened, and how much loss is acceptable if the view turns out to be wrong. Before committing real capital, it can help to practise the mechanics with a free demo account and review further trading education resources, so the numbers in this article become familiar in a live, but risk-free, setting.

Those new to options can also review Libertex's trading education materials before opening a live position.