Cash-Secured Put: how the position works

Sell a put and hold enough cash to buy the shares if assigned. Either the option expires and you keep the premium, or you are assigned and buy the stock at a net cost below the strike. Both outcomes are acceptable if — and only if — you genuinely want to own the underlying at that price.

Market view: Neutral to bullish — income or acquisition
Opened for: Credit
Maximum profit: The premium received, kept in full at or above the strike at expiry.
Maximum loss: K − premium, if the underlying falls to zero.
Breakeven: K − premium received.

How it is built

Sell 1 put at strike K
Set aside K × 100 in cash per contract to cover assignment

All figures above are quoted per share and settle at expiry. A standard equity option covers 100 shares, so multiply by 100 for a single contract.

Before expiry: the Greeks

Long delta, short vega, positive theta. Its payoff is identical to a covered call at the same strike, so the two are the same trade in different clothes; the cash-secured put simply expresses it without owning the shares first.

When to use it

When you want to buy the underlying below the market and are content to be paid for waiting. Elevated implied volatility raises the premium, which is why this works best after a sell-off — the same conditions that make people want to sell are what make the put worth selling.

What goes wrong

The premium is a thin cushion. A 3% credit against a 30% fall leaves you holding a badly damaged position.
The cash is committed for the life of the option, so the return on capital is far lower than the return on premium suggests.
Selling puts on a stock you do not actually want exposes you to acquiring something you must then immediately sell at a loss.

A worked example

SPY at 580. Sell the 560 put, 30 days out, for 5.60. Set aside $56,000.

Premium received: $5.60 per share — $560
Cash secured: $56,000 per contract
Maximum profit: $560 (1.0% on the cash committed over 30 days)
Effective purchase price if assigned: $554.40 (560 − 5.60)
Loss if SPY falls to 500: $5,440 ((560 − 500 − 5.60) × 100)

Commissions, exchange fees, financing and the bid/ask spread are excluded. On a multi-leg position the spread is usually the largest of these.

Common questions

Is this safer than buying the stock outright?

Slightly, and only by the premium. Below the strike you carry essentially the same downside as the shares, less the credit; above it you forgo the upside entirely. It is a different distribution, not a smaller risk.

Related strategies

Educational only. This page explains how a structure behaves; it is not a recommendation to trade it. Options and futures carry substantial risk, and short and leveraged positions can lose more than the amount originally invested.