Call assignment against put assignment
Assignment on a short call means your 100 shares are sold at the strike and cash arrives. Assignment on a short put means 100 shares are bought at the strike and cash leaves. Same word, opposite directions. Confusing them is how people end up owning something they did not plan to pay for.
Every other page in this series assumes you have this straight. This one exists to make sure of it.
The call side
You own 100 shares of UBER and you are short the October 17 $72.50 call. It finishes in the money and you are assigned.
- Out of your account: 100 shares of UBER.
- Into your account: $7,250 in cash, which is the strike times 100.
- Already yours: the $153 credit, from the day you sold the call.
- What you own afterwards: cash. No stock, no option, no obligation.
You sold something you had. The position closes itself and there is nothing left to manage. This is the benign direction, and it is why covered calls are the strategy people start with.
The put side
You are short the PFE June 19 $25 put, sold for $0.55 with $2,500 set aside. It finishes in the money and you are assigned.
- Out of your account: $2,500 in cash.
- Into your account: 100 shares of PFE, at a cost basis of $25.
- Already yours: the $55 credit, from the day you sold the put.
- What you own afterwards: a stock position, with all the risk a stock position has.
You bought something you did not have. The position does not close, it converts, and now you have a holding to manage on Monday morning.
Side by side
| Short call, assigned | Short put, assigned | |
|---|---|---|
| Shares | 100 sold | 100 bought |
| Cash | +$7,250 | -$2,500 |
| Position after | flat | long 100 shares |
| Premium | keep $153 | keep $55 |
| Effective price | sold at $74.03 | bought at $24.45 |
| What can still go wrong | nothing | everything the stock does next |
That last row is the entire difference. Call assignment ends your exposure. Put assignment starts it.
What it does to your buying power
On a cash-secured put the answer is boring, which is the point. The $2,500 was already frozen against the obligation, so assignment swaps frozen cash for stock and your buying power barely moves. That is the whole argument for securing it.
On a put sold against margin, the answer is not boring. The broker was holding a fraction of the strike, and now wants the position collateralised as a stock holding. If the shares gapped down on the way to assignment, the requirement lands at the same moment the position is worth least. That is what a margin call on an option seller usually is: not a bad trade, a correctly sized trade held with the wrong funding. The margin comparison covers the arithmetic.
Where the confusion comes from
People talk about "assignment risk" as one thing, and phrases like "getting assigned on your position" hide the direction. So does the wheel, which runs both assignments in sequence and blurs them together for anybody learning the strategy from a forum post.
The fix is a habit. Every time you sell an option, say out loud what assignment does to you, in shares and in dollars. Short call on shares you own: sell 100 at the strike, cash in. Short put: buy 100 at the strike, cash out. Ten seconds, and it survives the two years until you actually need it.
Both, in order
Run the wheel and you get the put assignment first, which buys the shares, then covered calls on those shares, and eventually the call assignment, which sells them. One full cycle is exactly that: cash to stock to cash, with premium collected at both ends.
Knowing which end you are standing at is the difference between a plan and a surprise.
OptionsKing scores every candidate strike on a deterministic 0 to 100 scale, blends that score with the return on the capital the trade ties up, and shows you the highest-ranked handful. There is no minimum score. How it works covers what the ranking does and does not tell you.
Questions people actually ask
Does assignment on a covered call mean I buy or sell the shares?
Sell. Your 100 shares are delivered at the strike price and the cash lands in your account. You keep the premium as well, and the position is then closed.
What happens when a cash-secured put is assigned?
You buy 100 shares at the strike, paid for with the cash you had secured against the obligation. You keep the premium, so your effective purchase price is the strike less the credit per share.
Which assignment is riskier?
The put, because it leaves you holding stock. A call assignment ends the position and hands you cash. A put assignment converts the trade into a share position that can keep losing money after the option is gone.
Can I be assigned on both legs at once?
Not on a single covered call or a single cash-secured put, which have one short leg each. On the wheel the two assignments happen in sequence rather than together: the put buys the shares, and a later call sells them.
Sources
Rules and thresholds above were checked against these documents on August 4, 2026. Exchange and broker rules change. Confirm anything you are about to act on with your own broker.
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Do the math on your own trade
Every price in this article is an illustrative worked example, not a quote. Read Assignment and expiration for the rest of the series, and the disclaimer before you act on any of it. Selling options carries real risk of loss, and the loss can be far larger than the premium you collected.