Long Calls and Puts: Payoffs, Breakeven, and Time Decay
Summary
This beginner overview explains the mechanics of buying call and put options on stocks. It defines premiums, strike prices, expiration, and in-the-money, at-the-money, and out-of-the-money states, then shows how the breakeven for a long call is strike plus premium and for a long put is strike minus premium. Two numerical examples illustrate those calculations. It also compares long calls with owning shares and long puts with short selling, emphasizing that buyers can lose the premium paid while calls can gain as the underlying rises and puts can gain as it falls.
The guide notes that option prices depend on the underlying price, time to expiry, volatility, strike, interest rates, and dividends. It describes time decay and offers a checklist of beginner pitfalls, including overlooking breakeven, expiry, and the possibility of losing the full premium. These are introductory payoff explanations rather than a complete pricing or trading framework: they omit contract-specific details and do not quantify how Greeks or changing market conditions affect value. The examples are illustrative, not evidence of strategy performance.
Key ideas
- A long call gives the buyer upside exposure above the strike, with the premium paid at risk.
- A long put can gain from a falling underlying price, while the buyer's loss is limited to the premium.
- For a long call, breakeven at expiry is strike plus premium; for a long put, it is strike minus premium.
- Time decay can erode an option's value even when the underlying price is unchanged.
- Option prices also respond to volatility, time remaining, strike, interest rates, and dividends.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.