The one-sentence version
A cash-secured put is a paid promise to buy 100 shares of a stock at a price you choose, if it falls there by a set date — with the cash to honor it already set aside.
The mechanics
Pick a stock you'd genuinely like to own. Pick a strike below today's price — a price where you'd be happy buying. Sell one put at that strike; collect the premium instantly; keep strike × 100 in cash as collateral. If the stock stays above the strike through expiration, the put expires worthless and the premium was pure income — often repeated month after month. If the stock closes below the strike, you're assigned: you buy 100 shares at the strike, but your true cost is lower — strike minus every dollar of premium collected.
Why serious investors like it
Compare it to a limit order to buy at $47 when the stock's at $50. The limit order pays you nothing while you wait. A $47 put pays you cash for the same commitment. If the stock never dips, the limit-order investor got nothing; you got paid. If it does dip, you both bought at $47 — except your net cost is $47 minus the premium.
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The honest risks
The stock can fall far below your strike — you're committed at $47 even if it's trading at $40, a real loss cushioned only slightly by premium. That's why put sellers say: only sell puts on stocks you actually want to own, at prices you'd genuinely pay. The strategy fails when people chase fat premiums on volatile stocks they'd never hold — premium is the market's payment for risk, and huge premium means huge risk. The other cost is opportunity: your collateral sits reserved while it could be invested elsewhere.
The numbers
Stock at $50; you sell a 35-day put at the $47 strike for $0.90 ($90 on $4,700 collateral). Expires worthless: 1.91% on collateral in 35 days — about 20% annualized. Assigned: you own shares with a $46.10 effective basis — an 7.8% discount to where the stock traded when you started. Model any setup in the Options Income Calculator, including assignment scenarios.
Screening like a pro
Disciplined put sellers filter hard: liquid large-caps (tight bid-ask spreads, real open interest), moderate volatility rather than lottery tickets, strikes near or below recent support, and no earnings report inside the option window — binary events are not what this strategy is paid to hold. Annualized yield on collateral is the comparison metric across candidates; many income sellers won't take a trade under low-double-digit annualized.
FAQ
What happens to my premium if I'm assigned?
It's yours regardless — assignment just means you also buy the shares; the premium lowers your effective cost.
Is assignment bad?
For wheel traders it's the plan, not the failure — you wanted the stock at that price; now you own it cheaper and can sell covered calls. See our complete wheel-strategy guide.
Can I get out early?
Yes, buy the put back anytime; many sellers close at 50–60% of max profit.
What does "cash-secured" protect me from?
Yourself — the naked version of this trade uses margin and can force liquidations. Full collateral means assignment is an inconvenience, never a catastrophe.
Related tools
Premium, ROC, and annualized return on any covered call or CSP.
Interactive payoff diagrams for every basic strategy.
Turn your own assumptions into a full-year income projection.
A risk-% rule turned into an exact share count.
More like this in our Options hub. New to the mechanics? Start with Covered Calls Explained or the plain-English tour of How to Read an Options Chain.
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