What happens when a put is assigned

What assignment means

When you sell a put, you give the buyer the right to sell you 100 shares at the strike price. If they use that right, you are assigned: the shares land in your account and the strike times 100 leaves it. For a cash-secured put that cash was already set aside, so assignment changes what you hold rather than how much you have.

Your result on an assigned put is the premium you collected minus the gap between the strike and the share price. If the stock closed a little under the strike, the premium can still cover the gap and the trade is a small win even though you now own shares.

When it happens, and early assignment

Most assignment happens at expiry. If the put finishes in the money, the broker exercises it automatically and the seller is assigned over the weekend or the next morning.

American-style options can be exercised any day, so early assignment is possible. It is uncommon because a buyer who exercises early throws away the time value still in the option. It becomes more likely when the put is deep in the money and has little time value left, or near an ex-dividend date on the underlying. If your short put is far in the money with days to go, assume you can be assigned at any time and plan for it.

How often it happened in our replays

At a 25-delta strike sold 30 to 45 days out, our multi-year replays across a range of ETFs saw assignment on roughly 20% to 37% of trades held to expiry. That is the honest shape of the trade, not a quirk of one ticker.

Assignment is not the same as a loss. In one stretch of our paper book, 10 of the 11 assigned trades were still net winners because the stock closed just below the strike and the premium covered the gap. The trades that hurt are the ones where the stock gaps far through the strike.

Your choices before and after

Before expiry you can buy the put back, which ends the obligation at whatever the option costs that day, or roll it to a later date (see the guide on rolling). Buying back a threatened put is expensive: in our records a defensive buyback cost roughly three times the premium originally collected, so one of them can erase several winning trades.

After assignment you can hold the shares and sell covered calls against them, which is the second half of the wheel, or sell the shares and accept the loss. In our replays, closing at half the premium when possible took care of much of the tail: most puts that would eventually have been assigned were closed at a profit first.

What to take from it

Only sell a put on shares you are willing to own at that strike, sized so that owning them would not hurt the account. Assignment is a normal outcome of the trade, and the risk that matters is not assignment itself but the size of the gap when it comes.