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What happens when a cash-secured put is assigned

When a cash-secured put is assigned, the cash your broker set aside is used to buy 100 shares at the strike. The put disappears, the shares appear, and you keep the premium. Your cost is the strike minus the premium. Here is what that looks like when the stock has kept falling.

Options guide · 7-minute read · Updated 2026-10-26

What assignment is

You sold a Put option. The buyer has the right to sell you 100 shares at the Strike price. When they use that right, you are assigned.

Your broker handles it. The cash set aside pays for the shares. The put position vanishes. 100 shares show up in your account, usually the next morning.

You don't get asked. You don't get to say no. That's the deal you made when you collected the premium. The general mechanics for any option are in our options assignment guide. This page is about the put seller's view.

When it happens

Almost always at expiry, if the put is in the money. The stock closes below the strike on expiry Friday, and over the weekend the shares are assigned.

Early assignment on a put is uncommon but possible on US stock options, since they can be exercised any day. It's more likely when the put is deep in the money with little time value left, or in a market panic. The rule of thumb: if your put is well below the strike and worth almost exactly the strike minus the stock price, early assignment is on the table.

What your account shows (an illustration, not a trade idea)

XYZ was $50 when you sold a 30-day $45 put for $1.00. You collected $100. The broker set aside $4,500.

At expiry XYZ closes at $41. Monday morning your account reads:

You started with $4,500. The premium made it $4,600. You now have $4,200. The trade is down $300 on the morning you're assigned: −$400 on the shares, +$100 of premium.

The broker may show the shares at a cost of $45.00. Your real cost is $44.00: the strike minus the premium. Write that down; it's the number the rest of the position is measured against. Some brokers adjust the cost basis for you, some don't. See cash-secured put break-even.

The week after: the stock keeps going

Here's the part most assignment pages skip. XYZ didn't stop at $41.

Nothing about the put protects you now. It's gone. You're a shareholder, and the shares are doing what falling stocks do. The $100 premium is a rounding error against a $700 hole.

This is why we say the strike is a promise, not a floor. The put was the first half of the wheel strategy. Whether the second half works depends on whether XYZ ever comes back, and nobody knows that.

Your three choices, with numbers

With XYZ at $37 and a $44 cost, you can:

Notice the covered call line. At $37, a call at your $44 cost pays nearly nothing. The calls that pay are below your cost, and each one you sell is a possible locked-in loss. That's the trap people walk into when they "wheel" a falling stock without a stop.

The answer isn't in the table. It's in the plan you wrote before you sold the put: a price where you'd sell the shares if assigned and they kept dropping. If you didn't write one, write it now, before Monday. Our exit rules page has a template.

Small things that catch people

• Fees. Some brokers charge an assignment fee. It's usually small, but it comes out of your cash.
• Settlement. The shares and the cash settle on a schedule. You can usually trade the shares right away, but check before you place a sell order.
• The premium isn't profit yet. It's part of your cost basis now. Count it as a gain only when the shares are sold.
• Tax. Assignment usually isn't a taxable event on its own; the premium adjusts your cost basis and tax comes when you sell the shares. Rules differ in the US and Canada, so check with a tax pro.
• Retirement accounts. In a Canadian TFSA or RRSP, whether you can sell puts at all depends on the broker. Where it's allowed, assignment works the same way: cash out, shares in.

Questions