Glossary term
Cash-Secured Put
A cash-secured put is an options strategy in which an investor sells a put while setting aside enough cash to buy the underlying shares if assigned.
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What Is a Cash-Secured Put?
A cash-secured put is an options strategy in which an investor sells a put option and sets aside enough cash, Treasury bills, or equivalent collateral to buy the underlying shares if the option is assigned. It is a short put, but with the cash needed to meet the purchase obligation already reserved.
The strategy is often used by investors who are willing to own a stock at a lower effective price. The investor receives option premium upfront. If the stock stays above the strike price, the put may expire worthless and the investor keeps the premium. If the stock falls below the strike price, the investor may be assigned and must buy the shares at the strike price.
Key Takeaways
- A cash-secured put combines a short put with reserved cash to cover assignment.
- The strategy is usually neutral to moderately bullish and is often used as a stock acquisition strategy.
- Maximum profit is limited to the premium received.
- Downside can be substantial because the investor may have to buy a sharply falling stock.
- The effective purchase price is the strike price minus the premium received, before taxes and transaction costs.
How the Strategy Works
Suppose a stock trades at $52. An investor would be willing to own it at $50, so the investor sells one put with a $50 strike and receives $2 per share in premium. Because one standard equity option contract usually covers 100 shares, the investor sets aside enough cash to buy 100 shares at $50, or $5,000, while receiving $200 in premium.
If the stock is above $50 at expiration, the put may expire worthless. The investor keeps the premium and still has the cash. If the stock is below $50, assignment is likely. The investor buys 100 shares at $50, but the premium reduces the economic cost to $48 per share before costs and taxes.
Payoff Profile
Feature | Cash-secured put |
|---|---|
Position | Short put plus reserved cash |
Best outcome | Stock stays above strike, or assignment occurs at an acceptable long-term price |
Maximum gain | Premium received |
Breakeven at expiration | Strike price minus premium received |
Main risk | Stock falls far below the strike after or before assignment |
Formula
The basic breakeven is:
Breakeven = Strike Price - Premium Received
If the strike is $50 and the premium is $2, the breakeven is $48. Below that level, the position loses money at expiration. The cash collateral reduces financing risk, but it does not make the stock risk disappear.
Cash-Secured Put Versus Naked Put
A naked put and a cash-secured put have similar option exposure, but very different funding discipline. A naked put writer may not have cash reserved for assignment and may rely on margin capacity. A cash-secured put writer has intentionally set aside the purchase amount.
That distinction matters in a fast decline. The cash-secured investor can meet assignment without selling other assets under pressure. The naked put writer may face margin calls, forced liquidation, or a scramble for liquidity at the worst possible time.
When It Can Make Sense
A cash-secured put can fit an investor who already wants to buy a stock, has done the valuation work, and is comfortable owning it through volatility. The premium is compensation for taking on downside exposure and for potentially missing the stock if it rises instead.
The strategy is weaker when the investor is chasing premium in a business they do not want to own. A high option premium often reflects high volatility, event risk, leverage, or uncertainty. The larger premium can be tempting, but the loss profile still resembles buying the stock after a decline.
Risk and Assignment
The central risk is not assignment by itself. Assignment is expected and acceptable if the investor truly wants the stock at the effective price. The real risk is a bad business or overvalued stock falling far below the strike.
Early assignment can also happen, especially around dividends or corporate events. Investors need to understand the option's expiration, ex-dividend dates, liquidity, bid-ask spreads, and tax consequences. A cash-secured put is simpler than many multi-leg strategies, but it is still an options trade with real obligations.
The Useful Lesson
A cash-secured put is best understood as a disciplined way to offer to buy a stock at a chosen price while getting paid for making that offer. It is not free income. It is equity downside exposure with a premium cushion and a cash reserve.