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How to sell a cash-secured put, order by order

Selling a cash-secured put takes one order. You pick a put, choose "sell to open", set a limit price, and your broker sets aside the cash to buy 100 shares. Here is each line of that ticket.

Options guide · 6-minute read · Updated 2026-10-26

What the order does

You are selling a Put option. The buyer pays you a premium. You agree to buy 100 shares at the Strike price if they choose to sell them to you.

"Cash-secured" means the cash to buy those shares sits in your account, locked, until the put is closed or expires. The broker does the locking. You just need to have the cash.

This is the first half of the wheel strategy. If puts are new to you, read cash-secured put explained first.

Step 1: open the chain and find the put

Open the Options chain for the stock. Pick an expiry about 30 to 45 days away. Switch to the puts side.

Look at strikes below today's price. Note three things for the strike you like:

• Bid: what buyers pay right now.
• Ask: what sellers want.
• Open interest: how many contracts already exist. Low numbers mean a hard-to-trade option.

Our chain guide shows where each column lives.

Step 2: fill in the ticket

Every broker's ticket has the same parts, with different names. Here is what each one should say.

"Sell to open" is the line people get wrong. "Sell to close" is for selling an option you already own. If you don't own one, the broker should refuse it or warn you.

Step 3: read the confirmation before you click

The review screen shows the cash the broker will lock. Check it against your own math: strike × 100.

A worked example (an illustration, not a trade idea). XYZ trades at $50. You sell one 30-day $45 put. Bid $0.95, ask $1.05. You set a limit at $1.00.

• Premium if filled: $1.00 × 100 = $100, into your account today.
• Cash set aside: $45 × 100 = $4,500.
• Break-even on the shares if assigned: $45 − $1.00 = $44.

If the review screen shows a smaller number than $4,500, you may be in a margin account and the broker is lending you part of it. That is a different trade. See how much cash a cash-secured put really needs.

Here is what the $100 is buying you, outcome by outcome:

The premium is the most you can make. The share loss is not capped until zero.

Step 4: after the fill

Three things to check once the order fills:

1. Positions shows "−1" next to the put. The minus sign means you are short it.
2. Cash available dropped by about $4,500. The money is still yours, just locked.
3. The premium landed, minus any per-contract fee.

Then write the trade down: the stock, the strike, the premium, the expiry, and the price you'd sell the shares at if you're assigned and the stock keeps falling. That last line is the one most people skip, and it's the one that decides how the trade ends.

What to do if it doesn't fill

Options fill at a price someone else accepts. If your limit sits a few cents above the bid, it may fill in minutes or not at all.

Lower the limit by a cent or two, not all the way to the bid. If it still won't fill, the option may be too thinly traded. A wide gap between bid and ask is the warning sign. Pick a more liquid strike or a more liquid stock.

Never switch to a market order to force the fill. On a quiet option, a market sell can fill well below the bid you saw.

Questions