Educational only, not tax, legal, or financial advice. Rules vary by broker and situation — verify specifics with your broker or a professional.
Early exercise is when the holder of an American-style option uses their right to buy (call) or sell (put) before expiration. It’s usually not worthwhile — but in specific cases it is, which drives early assignment.
Why it’s usually not worth it
Exercising early throws away any remaining time value — you’d capture only the intrinsic value, when selling the option would capture intrinsic plus extrinsic. So for most buyers, selling the option is better than exercising it. That’s why the vast majority of options are closed by trading, not exercise.
When it does make sense
The classic case: a call holder exercises early to capture a dividend when the dividend exceeds the remaining time value (dividend risk for the seller). Also, deep-ITM options with negligible time value are sometimes exercised. European-style options (like SPX/XSP) can’t be exercised early at all — only at expiration (American vs European).
Early exercise usually wastes time value — selling beats exercising. The main exception is grabbing a dividend, which is why calls get exercised around ex-dates.
What it means for a scalper
You’ll almost never exercise early — scalpers sell the option to close. Early exercise mainly matters as the mechanism behind early assignment (a seller’s risk). SPY is American-style so it’s theoretically exercisable early; in practice you just sell before the bell.
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