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Position structure
A cash-secured put combines a short put with cash reserved to buy the deliverable shares at the strike.
Lesson · Options Trading
Cash-Secured Puts
Sell puts while reserving cash for possible assignment, calculate the effective purchase price, maximum premium profit, required cash, and substantial downside exposure.
Synthetic educational examples
Core concepts
A short put with the purchase cash set aside: a premium now for agreeing to buy at the strike.
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Effective purchase price
Strike minus premium received estimates the expiration breakeven and net share basis if assigned.
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Limited reward, substantial risk
Maximum profit is the premium, while loss can be substantial if the stock falls far below the strike.
Interactive lesson
Set strike and premium, then drag the expiration price; the reserved cash, effective price and payoff follow.
The reserved cash supports purchase at the strike if assigned. Broker collateral treatment can differ.
Plan a cash-secured put
Only sell the put when assignment at the strike is financially and strategically acceptable.
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Confirm willingness to own shares
Assignment can require a full purchase at the strike even after a large decline.
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Reserve sufficient cash
Use the deliverable, strike, quantity, and broker requirements.
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Calculate effective basis
Subtract premium from strike and include fees in real planning.
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Plan assignment and exit
Define whether to close, roll, accept shares, or avoid expiration before entering.
Cash-secured-put mechanics
Score 0 / 0Choose the best answer.
Lesson rule
Change the inputs, calculate the result, and explain the risk before selecting a contract.
Common mistakes
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Treating premium as free incomePremium compensates for accepting downside and assignment risk.
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Choosing a strike solely for high premiumHigher premium often comes with greater probability and severity of assignment.
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Using cash needed elsewhereAssignment can consume the reserved capital during a market decline.
Completion standard
✓
Finish when you can state the cash a cash-secured put reserves, its effective purchase price, its maximum profit and its stock-to-zero loss, from strike and premium alone.
The drill asks for all four; the loss is bounded, and you should be able to say by what.
Model scope: Theoretical values use a simplified European Black–Scholes model with a fixed 4.5% annual rate and no dividend input, so a number here can be reproduced in any calculator that takes those inputs. Listed products, early exercise, dividends, spreads, fees, and market conditions can produce different prices and outcomes.