A cash-secured put is an income strategy where you sell a put option and hold enough cash to buy 100 shares at the strike price if the option is exercised. You collect a premium upfront. If the stock stays above your strike at expiration, the option expires worthless and you keep the premium. If the stock falls below your strike, you are obligated to buy shares at that price, which you may have intended to do anyway.

That structure makes the cash-secured put one of the most practical strategies for traders who want to generate income on a stock they would be willing to own. The premium collected acts as a partial cushion against losses, reducing the effective cost of acquiring shares below the current market price. The tradeoff is that your upside is capped at the premium received if the stock runs higher and you were never assigned.

Before selling a cash-secured put, run the exact numbers for your strike and premium. A cash-secured put calculator shows your max profit, breakeven price, and return on capital in seconds so you can evaluate the trade before placing it.

What Is a Cash-Secured Put?

A cash-secured put is a short put position backed by reserved cash. You sell a put option, giving the buyer the right to sell 100 shares to you at the strike price. In exchange, you collect a premium. The “cash-secured” part means you have set aside enough capital in your account to cover the full cost of purchasing those 100 shares if you are assigned.

Brokers typically require you to reserve the full assignment value, calculated as the strike price multiplied by 100. That cash reserve is why this strategy is approved for most standard brokerage accounts. It is considered lower risk than a naked put because the cash to cover assignment is already there.

The cash-secured put is closely related to the short put in mechanics. The primary difference is the account treatment: a cash-secured put explicitly ties up cash equal to the assignment value, while a margin account may allow a short put without dedicating that full reserve.

Cash-Secured Put Payoff: Max Profit, Max Loss, and Breakeven

The three numbers that define a cash-secured put trade are your maximum profit, maximum loss, and breakeven price. Knowing these before you sell helps you decide whether the premium justifies the risk at a given strike.

Maximum Profit

Your maximum profit is the premium you collected when selling the put, multiplied by 100 for one contract. This is the best case: the stock closes at or above your strike at expiration, the put expires worthless, and you keep the entire premium. The trade is finished and your reserved cash is released.

Maximum Loss

The maximum loss occurs if the stock falls to zero. In that case, you are assigned shares worth nothing, but you paid the full strike price for them. Maximum loss is therefore the strike price minus the premium collected, multiplied by 100. In practice, a stock falling to zero is an extreme scenario, but understanding the theoretical maximum helps size positions appropriately.

Breakeven Price

Your breakeven is the strike price minus the premium received per share. If the stock closes exactly at breakeven at expiration, you are assigned shares at a net cost equal to the current market price, and you have neither profited nor lost. At any price above breakeven, the strategy shows a net profit when accounting for the premium collected.

Cash-Secured Put Example

Suppose a stock is trading at $52. You sell one cash-secured put with a $50 strike expiring in 30 days and collect a $1.50 premium per share, or $150 for one contract. You reserve $5,000 in cash to cover a potential assignment.

• Maximum profit: $150 (if the stock stays above $50 at expiration)
• Breakeven price: $50.00 minus $1.50 = $48.50 per share
• Maximum loss: ($50.00 minus $1.50) x 100 = $4,850 (if the stock goes to zero)
• Return on capital (30 days): $150 / $5,000 = 3.0%

If the stock closes above $50 at expiration, you keep $150 and your $5,000 cash is freed. If it closes at $48, you are assigned 100 shares at $50 each. Your net cost per share is $48.50 after the premium, which is below where the stock was trading when you sold the put. You now own the shares and can hold them or sell covered calls against the position.

When to Use a Cash-Secured Put

The cash-secured put works best in two situations. First, when you want to generate premium income on a stock you have a neutral to mildly bullish outlook on and are willing to own at a lower price. Second, when you want to enter a long stock position at a discount to the current price, using the sold put as a limit order with a built-in rebate.

The strategy is less effective when volatility is low, because lower implied volatility means lower premiums. It is also a poor fit for stocks you would not want to own, since assignment is always possible. Selecting the strike and expiration to match your actual entry target makes the strategy work as intended.

Traders who want to limit downside further can pair a short put with a long put at a lower strike, creating a bull put spread. The spread reduces the premium collected but caps the maximum loss at a defined amount.

Cash-Secured Put vs. Covered Call

The cash-secured put and the covered call are synthetically equivalent positions with different starting points. Both strategies collect premium and profit when the underlying stays within a range, and both carry similar risk profiles in terms of P&L shape.

The practical difference is that a covered call requires you to already own the shares. You sell a call against your existing position to collect income and cap your upside. A cash-secured put, by contrast, does not require you to own shares upfront. You collect premium while waiting for a potential entry point at a lower price.

Some traders use the two together as a wheel strategy: sell cash-secured puts until assigned, then sell covered calls against the assigned shares until called away, then return to selling puts. For a detailed comparison of the two strategies, see covered call vs. cash-secured put.

How to Use the Cash-Secured Put Calculator

To model a cash-secured put trade, enter the following inputs into the cash-secured put calculator:

• Strike price: the strike of the put you are selling
• Premium received: the credit you collect per share
• Number of contracts: how many puts you are selling (each covers 100 shares)

The calculator instantly returns your max profit, breakeven price, max loss, and return on capital reserved. Use these outputs to compare different strikes and expirations, or to check whether the premium available at your target strike justifies the assignment risk.

Common Mistakes to Avoid

Selling puts on stocks you would not want to own is a common mistake. Assignment is always possible, and if it happens on a stock you have no conviction in, you are left holding a position you did not want. Only sell cash-secured puts on stocks or ETFs you are comfortable holding at the strike price.

Selecting a strike purely for the highest premium without accounting for the breakeven is another error. A higher premium comes from a higher strike or higher implied volatility, but it also means a higher breakeven if assigned. Always check the breakeven before selling to confirm it aligns with your entry target.

Finally, ignoring earnings dates can create unexpected risk. Implied volatility often spikes before earnings, inflating premiums. But the stock can move sharply in either direction after the announcement. If you are selling puts to collect income rather than to play earnings, check the expiration date against any upcoming earnings release before entering the trade.