Calculating Option Break-Even at Expiration: Worked Examples

The break-even price on an option at expiration is the underlying asset price at which the buyer recovers the premium paid and begins to profit. For calls and puts, the calculation is straightforward: strike price plus (or minus) the premium. Below are worked examples for each strategy.

The core principle

An option buyer pays cash upfront (the premium). At expiration, the option either has value or it does not. The break-even point is the underlying asset price at which the option’s intrinsic value exactly equals the premium paid. Any movement beyond break-even generates a profit.

For a seller, it is the reverse: they receive the premium. They are profitable as long as the underlying stays within a range. If the underlying moves beyond that range, the profit shrinks and disappears.

Long Call Example

You buy a call option on Apple stock:

• Strike price: $150
• Premium paid: $5 per share

At expiration, the break-even price is $155 ($150 + $5).

Here is what happens at different prices:

You need Apple to rise to at least $155 just to recover your $5 premium. If it only reaches $152, you lose money ($2 intrinsic value − $5 premium paid = −$3 loss).

Long Put Example

You buy a put option on Microsoft stock:

• Strike price: $300
• Premium paid: $8 per share

Break-even price: $292 ($300 − $8).

If Microsoft is below $292 at expiration, you are in profit:

The put gives you the right to sell at $300. If Microsoft is $292, you exercise, sell at $300, and pocket $8, which recovers your premium. Below $292, you gain. Above $300, the option is worthless and you lose the entire $8.

Short Call Example

You sell (write) a call option on Tesla stock:

• Strike price: $220
• Premium received: $7 per share

Break-even price: $227 ($220 + $7).

As the seller, you want the stock to stay below the strike. You keep the premium as profit. But if it rises too high, your profit disappears:

You receive $7 when you sell the call. If Tesla stays at $220 or below, you keep it. If it rises to $227, the buyer exercises and you are forced to sell at $220 (losing $7), offset by the $7 premium you received. Above $227, you lose money.

Short Put Example

You sell a put option on Nvidia:

• Strike price: $400
• Premium received: $12 per share

Break-even price: $388 ($400 − $12).

You pocket $12 upfront. If Nvidia stays at $400 or above, you keep the full amount. If it falls to $388, the buyer exercises, forcing you to buy at $400 (losing $12), but the premium covers it. Below $388, you lose money.

Why break-even matters

Break-even is your margin of safety. It tells you how much the underlying must move for your trade to pay off. For a long position, you need the underlying to move your way past break-even. For a short position, you are profitable as long as the underlying stays within a range around the strike.

Traders also use break-even to compare option strategies. A straddle (buying both a call and a put) has two break-even points: one above the strike, one below. A covered call (selling a call against stock you own) has a break-even based on your stock cost plus the premium paid, minus the premium you received from the call.

Time decay and break-even before expiration

The examples above show break-even at expiration, when the option has only intrinsic value left. Before expiration, an option has time value, and break-even shifts. An out-of-the-money call might have zero intrinsic value but still be worth something because there is time for the underlying to move. For practical trading, track both the at-expiration break-even and the current market value of the option.

Key takeaway

The break-even formula is simple enough to memorize:

• Long call: Strike + Premium
• Long put: Strike − Premium
• Short call: Strike + Premium
• Short put: Strike − Premium

The logic is always the same: a buyer needs the option to move in their direction far enough to cover what they paid. A seller needs the underlying to stay within a range to keep their profit. Once you know the break-even, you can instantly assess whether a trade is worth the risk.

See also