- An option is a contract with an underlying asset, strike price, expiration date, and premium.
- The buyer has a right; the seller takes on an obligation if assigned.
- Long-option loss is generally limited to the premium paid, while some short-option positions can create much larger losses or delivery obligations.
- Time decay, volatility, liquidity, contract multiplier, assignment, and transaction costs can matter as much as the directional view.
Rules, fees, tax treatment, plan features, market structure, and product terms can change. Use this framework as a starting point, then confirm current official documents and provider terms before acting.
Start with the contract
| Contract | Buyer right | Seller obligation if assigned |
|---|---|---|
| Call | Buy the underlying at the strike price | Deliver/sell according to the contract terms |
| Put | Sell the underlying at the strike price | Buy according to the contract terms |
Know the five contract terms
The stock, ETF, index, or other reference asset.
The contract price used for exercise.
The date or period after which the contract ends.
The option price paid by the buyer and received by the seller.
Direction alone is not enough
A call can lose money even if the underlying rises, and a put can lose money even if the underlying falls, depending on the magnitude and timing of the move, the premium paid, changes in implied volatility, and time remaining. Options add path and timing dimensions to the investment thesis.
Assignment creates real obligations
Short option positions can be assigned according to contract and exercise rules. Investors need to understand whether assignment would create a stock position, cash settlement, borrowing need, or other obligation. Never treat an option as only a price chart.
Options readiness checklist
Can you draw the maximum gain, loss, and breakeven logic?
What happens if the contract is exercised or assigned?
How does expiration change the thesis?
Check spread, open interest, size, and execution risk.