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Assignment mistakes beginners make, and a calmer way to handle Monday

Assignment itself is just the trade finishing: a put buys you shares, a call sells them. The losses usually come from what people do next. Not having the cash, panicking at Monday's open, and selling at the low are the big three.

Options guide · 9-minute read · Updated 2026-10-27

The short answer

Assignment is not a mistake. It's one of the outcomes you agreed to when you sold the option. For a put, you buy 100 shares at the strike. For a covered call, you sell them.

The expensive mistakes happen around it:

1. Not having the cash to pay for a put assignment, so the broker lends it to you on margin.
2. Panicking on Monday after a Friday assignment, and acting at the open.
3. Selling the shares at the low, locking in the worst price of the move.

They usually come as a chain. The worked example shows how.

The worked example (an illustration, not a trade idea)

You have $2,000 in a margin account. A made-up stock, XYZ, trades at $33. You sell a $30 put for $0.70 and collect $70.

A cash-secured version would need $3,000. Your margin account lets you sell it anyway. That's mistake one: the put is bigger than your cash.

On expiration Friday, XYZ closes at $27. You're assigned. You buy 100 shares at $30.

Over the weekend, you open your app:

A negative cash number and a stock below your price. You don't sleep well.

Monday, XYZ opens at $26. Afraid of a margin call, you sell all 100 shares in the first minutes. The spread is wide and you fill at $25.50. That's mistakes two and three.

Three weeks later, XYZ drifts back to $29. You're not in it.

Two paths, compared

Now replay the same trade with a plan. You had $3,000 in cash, so the put was fully cash-secured. After assignment, you'd set an exit: sell the shares if XYZ closes below $24. On Monday, you sell a 30-day $30 covered call for $0.60.

Look at both columns. If XYZ recovers, the plan does much better. If XYZ keeps falling, the plan loses more, −$470, because the planned exit sat lower than the panic sale.

So the lesson isn't "never sell." It's that the plan, not the panic, should decide. The panic seller picked the price that felt worst, in the minutes when spreads are often widest. The planned seller picked a level in advance, on a calm day, and stuck to it.

The mistakes, one by one

Not having the cash. Size every put as if it will be assigned. Strike × 100 should be cash you have, unless you've chosen margin on purpose and sized for it. See roll or take assignment for the questions to ask before expiry.

Not checking whether you were assigned. Assignment notices often arrive overnight or by the next morning. Check your positions after every expiration Friday. A surprise on Tuesday is worse than one on Saturday.

Panicking Monday. The first minutes after the open often have wide spreads and big swings. Unless your plan says to exit at the open, wait for things to settle and read your notes first.

Selling at the low. A stock that just fell through your strike is often at its most emotional price. If your reason to own it still holds, the wheel strategy has a next step: sell a covered call at or above your cost.

Selling a call below your cost right away. It pays more, but if the stock bounces, your shares are called away at a locked loss.

Forgetting the premium. Your cost per share is the strike minus the premium: $29.30 here, not $30. Get that number right before deciding anything.

Ignoring the call side. Covered calls can be assigned early, especially the day before an Ex-dividend date. If that would upset you, plan for it.

A calm Monday routine

1. Check your account Saturday. Note what was assigned and your cash.
2. Write your cost basis. Strike minus premium.
3. Read your plan. What did you decide to do if assigned? Follow that.
4. If cash is negative, call or message your broker to understand any deadline. Don't guess.
5. Wait out the first minutes after the open, unless the plan says otherwise.
6. Then act on the plan: sell a covered call above your cost, hold, or exit at the planned level.

If you expect to be close to the strike on expiration day, closing for a few cents first can avoid the surprise entirely. See letting an option expire worthless. If the put is already in the money, managing a short put in the money lays out the choices before Friday.

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