Cash-Secured Put
A cash-secured put is an options strategy in which an investor sells a put option while holding enough cash in their account to cover the full cost of purchasing 100 shares at the strike price if the put is assigned.
The cash-secured put (CSP) is one of the most popular income-generating strategies among equity options traders. By selling a put option and reserving the cash to buy the shares if assigned, the investor effectively gets paid a premium to agree to purchase a stock at a price they find acceptable. If the stock stays above the strike through expiration, the put expires worthless and the investor keeps the premium. If the stock falls below the strike and the put is assigned, the investor acquires 100 shares at the strike price, with their effective cost basis reduced by the premium received.
For example, suppose a stock trades at $75 and an investor would be happy to own it at $70. They sell a $70-strike put expiring in 30 days for $1.50 per share ($150 per contract) and hold $7,000 in cash. Two outcomes follow. If the stock stays above $70 at expiration, the put expires worthless and they keep the $150 — a 2.1% return on the $7,000 reserved in 30 days. If the stock falls to $65 and the put is assigned, they acquire 100 shares at $70, but their effective cost basis is $68.50 ($70 strike minus $1.50 premium received) — they own the stock at $1.50 below the strike they were willing to pay.
The cash-secured put is mechanically similar to a covered call. Both strategies collect premium and profit from sideways to mildly bullish stock movement. The difference is timing and entry point: covered calls are written on shares already owned, while CSPs are entered before owning shares — effectively agreeing to buy at the strike.
CSPs work best on stocks the investor genuinely wants to own at the strike price. Selling a put purely for income on a stock that would be painful to own at the strike is a common error — assignment is not a failure of the strategy, it is a deliberate possible outcome that should be planned for.
Risk management for CSPs mirrors covered calls: choose strikes at meaningful support levels with high enough premium to justify the potential obligation, define a maximum loss threshold, and have a plan for the shares if assigned — either selling covered calls to reduce the effective cost further or holding for the intended long-term investment thesis.
CSP as Entry Strategy: The cash-secured put is an efficient mechanism for establishing a stock position at a below-market price. Rather than placing a limit buy order and hoping the stock pulls back to a target price, the CSP seller gets paid to wait. If the stock never retreats to the target, the premium collected is a consolation return on the reserved cash. If the stock does decline to the target, assignment delivers shares at the desired cost basis minus the premium — improving the entry point compared to the limit order that would simply buy at the target without any income. Active investors use this approach systematically on watchlist stocks, cycling through monthly expirations to collect premiums while patiently waiting for favorable entry points.
CSP vs Covered Call: The cash-secured put and the covered call are mathematical equivalents at the same strike and expiration — a principle called put-call parity. Both strategies benefit from the stock closing at or above the strike at expiration; both are damaged by a sharp decline in the underlying stock. The practical difference lies in the investor's current position: the CSP seller does not yet own shares and may never own them if the stock stays above the strike; the covered call writer already holds shares and caps their upside at the strike. Investors who are comfortable owning shares at a specific price often prefer to cycle between the two strategies: sell a CSP to enter the position, sell a covered call once assigned to generate income on the shares, and continue rolling calls until called away — then return to the CSP to re-establish the position at a new target.