Chapter 22: Selling Cash-Secured and Naked Puts
Core idea
Selling a put is selling someone else the right to force you to buy the underlying stock at the strike price. You collect cash (the premium) for taking on that obligation. If the stock stays above the strike, the put expires worthless and you keep the premium. If the stock falls through the strike, you buy the shares at the strike — typically below today’s market price.
Cash-secured vs. naked — same trade, different collateral
The two variants are mechanically identical. The difference is what backs the obligation:
- Cash-secured put — you hold enough cash in the account to actually buy the shares if assigned. Level 2 strategy. Safer because you’ve already pre-funded the worst-case purchase.
- Naked put — you back the obligation with margin rather than full cash. Level 4 strategy. Capital-efficient, but a sharp decline can trigger margin calls and forced liquidations.
The win-either-way framing
The cash-secured put is most powerful when sold on a stock you genuinely want to own at the strike price. Two outcomes, both acceptable:
- Stock stays above the strike → put expires worthless → you keep the premium as pure income.
- Stock falls to/below the strike → you buy the stock at your target price, with cost basis further reduced by the premium received.
That is what traders mean when they say the strategy lets you “get paid to wait.”
Why it matters
A disciplined entry technique
Most retail investors buy stocks reactively — chasing a name as it rises or buying a dip and hoping it doesn’t get worse. Selling a cash-secured put forces a commitment to a specific entry price and pays you to wait for it. You either get filled at your target (good) or get paid for the patience (also good).
Premium income with a real downside
The strategy is often advertised as “free money.” It is not. If you sell a put on a stock that craters, you are obligated to buy at the strike no matter how far the stock has fallen. The maximum loss is strike price minus premium received, times 100, per contract — and that loss is fully realized if the stock goes to zero. The defining risk is owning a stock you no longer want to own.
Why “stocks you want to own” is non-negotiable
The single best filter for this strategy is whether you would be happy buying 100 shares of the stock at the strike price today. If yes, sell the put. If no, walk away. Selling puts on stocks you don’t want exposes you to assignment without a fallback plan.
Key takeaways
Key takeaways
- Selling a put obligates you to buy the stock at the strike price if assigned; the premium is your payment for taking that obligation.
- Cash-secured = enough cash on hand to buy the shares. Naked = backed by margin only — higher capital efficiency, higher risk.
- Only sell puts on stocks you genuinely want to own at the strike — assignment is a feature, not a failure.
- Maximum profit is capped at the premium collected; maximum loss is strike minus premium (stock could fall to zero).
- Effective entry price if assigned = strike − premium received. This is the discount the strategy buys you.
- Use 30–45 day expirations and OTM strikes 5–15% below current price to balance income, probability of assignment, and capital tied up.
Mental model
Read it as: The flow has two acceptable terminal states. The upper branch (keep premium) generates income while you wait. The lower branch (assigned) acquires the stock at a discount to today’s price. Both terminate the trade favorably — provided you genuinely wanted the stock at the strike when you sold the put.
Practical application
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Pick a stock you would buy today. Fundamentals strong, valuation reasonable, no upcoming binary event you fear. This is the gating step — skip it and the rest doesn’t work.
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Choose a strike below current price. Common practice: 5–15% OTM, depending on volatility and how badly you want to be assigned. Lower strike = more discount, less premium, lower assignment probability.
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Choose a 30–45 day expiration. Shorter than that and the premium is too small; longer and theta decay is slow. Monthly expirations have the best liquidity.
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Reserve the cash. Strike × 100 must sit in the account (cash-secured) or as available margin (naked). Do not sell more contracts than you can afford to be assigned on.
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Manage the position. If the put has decayed to 20–50% of premium received, consider buying it back to close — locking in profit and freeing capital for the next trade.
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Accept assignment gracefully. If the put goes ITM and you’re assigned, you now own the shares at your target price. Consider selling covered calls against them (the “wheel” strategy).
Example
Getting paid to bid for a stock you want
Acme Industrial trades at $52. You want to own it but only at $48. Instead of placing a $48 limit buy order and waiting (free, but earns nothing), you sell a 35-day cash-secured put:
- Sell 1 Acme 48 put for $1.30 premium ($130 collected)
- Reserve $4,800 in cash for potential assignment
The three outcomes:
- Acme stays above $48 at expiration: Put expires worthless. You keep $130 — a 2.7% return on the reserved cash in 35 days, roughly 28% annualized. Sell another put next month.
- Acme drifts to $47: You are assigned 100 shares at $48. Effective cost basis: $48 − $1.30 = $46.70. You acquired the stock $5.30 below where it was trading when you started, with a market price ($47) above your effective entry.
- Acme craters to $35 on bad news: You are still assigned at $48. Net unrealized loss: ($35 − $46.70) × 100 = −$1,170. This is the strategy’s defining risk — you bought at $48 a stock now worth $35. Mitigated only by genuinely wanting to own Acme through the volatility.
The pattern: in two of three scenarios you win. In the third, you own a stock you wanted to own anyway — at a price you accepted in advance.
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