Cash-Secured Puts Explained: How They Work and the Risks
By Sean Wade · 7 min read ·
Quick answer
A cash-secured put (CSP) is when you sell a put option and set aside enough cash to buy 100 shares per contract at the strike price. You collect a premium up front. If the stock stays above the strike at expiration, you keep the premium; if it falls below, you may be assigned and buy the shares at the strike.
The "Stocks BnB" way to think about it
Sean describes cash-secured puts like renting out a house you haven't bought yet — without tenants, property taxes or utilities. Your cash is the property. Someone pays you "rent" (the premium) for the right to sell you shares at a price you already agreed you'd be happy to pay.
The analogy has limits: unlike rent, the premium is your maximum gain on the trade, and the "house" can lose value while you're committed to buying it.
How a cash-secured put works
- Pick a stock you would be comfortable owning.
- Choose a strike price (the price you'd buy at) and an expiration date.
- Sell one put contract and collect the premium. One contract usually covers 100 shares.
- Keep strike × 100 in cash in your account for each contract — that's what makes it "cash-secured."
Worked example
Say stock XYZ trades at $52. You sell one 30-day put with a $50 strike for a $1.00 premium. You receive $100 (1.00 × 100) and set aside $5,000 in cash.
If XYZ closes above $50 at expiration, the option expires worthless and you keep the $100 — about a 2% return on the cash secured over 30 days, before fees.
If XYZ closes at $45, you'll likely be assigned and buy 100 shares at $50. Your effective cost is $49 per share ($50 strike − $1 premium), so you'd be showing a $400 unrealized loss versus the $45 market price.
What are the risks?
- Downside risk is similar to owning the stock: if it drops sharply, you still have to buy at the strike.
- Upside is capped at the premium — if the stock rallies, you don't participate.
- Cash is tied up until expiration or until you close the position.
- Early assignment can happen, especially near ex-dividend dates or when the option is deep in the money.
- Options require approval from your broker and carry risks described in the OCC's Characteristics and Risks of Standardized Options.
What happens after assignment?
Many investors who are assigned then sell covered calls against the shares they now own — a cycle often called "the wheel." It can generate ongoing premium, but it does not remove the risk of the underlying stock falling further.
Choosing strike and timeframe
Lower strikes (further below the current price) pay less premium but are less likely to be assigned. Shorter expirations decay faster but need more frequent management. The most important rule: only sell puts on companies you'd genuinely want to own at that strike.
This article is for educational purposes only and is not financial advice. Investing and options trading involve risk, including loss of principal. Do your own research and consider speaking with a licensed professional. See our disclaimer.