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Early assignment vs assignment at expiry: when each one happens

Most short options that get assigned are assigned at expiry, when they end in the money. Early assignment can happen any day before that, but it usually follows a clear pattern: little time value left, and often a dividend.

Comparison · 6-minute read · Updated 2026-10-26

The short answer

Assignment at expiry happens after the last trading day. If your short option ends in the money, it is usually exercised on its own. You buy or sell the shares at the strike.

Early assignment happens before expiry. US stock options are American-style, so the holder can exercise any day. Most holders don't, because exercising early throws away the option's time value. See Early assignment.

So expiry assignment is the normal case. Early assignment is the exception, and it has warning signs.

Side by side

Why early assignment is rare

An option's price has two parts. The part that's in the money is intrinsic value. The rest is time value, the Extrinsic value.

If a holder exercises early, they get only the intrinsic value. The time value is gone. Selling the option in the market would have paid them both. So for most holders, early exercise is a bad deal, and they don't do it.

Early exercise starts to make sense only when the time value is close to zero. That happens when the option is deep in the money, near expiry, or both.

When early assignment does happen

The dividend case for covered calls

Here is the most common early assignment for wheel sellers.

The holder of a call does not get the dividend. The owner of the shares does. If the dividend is larger than the call's remaining time value, the holder may exercise the day before the Ex-dividend date to own the shares and collect it.

That means your shares get called away early, and you miss the dividend.

The deep put case

A short put that is deep in the money, with little time value left, can also be assigned early. The holder may want their cash now instead of waiting. This is less common than the dividend case, but it happens, most often in the last week.

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

Two made-up trades on XYZ.

Covered call. You own 100 shares bought at $48 and sell a $50 call for $1.00. XYZ rises to $56. The call is worth about $6.10, so only $0.10 is time value. A $0.80 dividend goes ex tomorrow. The holder exercises tonight.

Short put. You sell a $45 put for $1.00. XYZ falls to $40, and stays there into expiry Friday. You're assigned at expiry.

Notice the last row. Early assignment on a put changes when you own the shares, not what you lose. You agreed to buy at $45 either way.

Does early assignment hurt you?

Usually less than it feels. When you're assigned, you get exactly what you promised: shares sold at the strike, or shares bought at the strike. Your profit or loss is locked at that point.

What you lose is choice. You can no longer roll, close, or wait. On a covered call before a dividend, you also lose the dividend.

In the wheel strategy, assignment is a planned step. Early assignment just moves that step forward.

How to lower the chance of early assignment

• Check the ex-dividend date before selling calls. Compare the dividend with the call's time value.
• Close or roll deep in-the-money options before the last few days, if you don't want the shares to move.
• Keep enough cash for a put assignment at any time, not just at expiry.
• Read your broker's notices. Most brokers send an assignment notice by the next morning.

Canadian sellers in a TFSA or RRSP face the same rules on US-listed options; check that your broker allows the strategy in that account.

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