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Expiration Dates: How Time Affects an Option
An option's value depends on where the stock sits versus the strike at expiration, and time value erodes faster the closer that date gets.
Every option has an expiration date — after that, the contract is simply gone, whether or not you used it.
What happens when the clock runs out
Every option stops existing on its expiration date. What happens at that moment depends only on where the stock sits relative to the strike. If it's above the strike (for a call) or below it (for a put), the option has value and is typically exercised automatically. Otherwise, it expires worthless — no shares change hands, and your only loss is the premium you already paid.
This is also why an option can be "right" about direction and still lose money: a call that needed the stock at $65 by Friday gets no credit for reaching $65 the following Monday. The date is as real a variable as the price.
Worked example
You hold an XYZ $60 call expiring Friday. Here's how three possible closing prices play out:
| XYZ closing price | Strike relationship | What happens |
|---|---|---|
| $65 | $5 above strike | Has value; typically auto-exercised or sold before the close |
| $60 | Exactly at strike | Right at the line — brokers generally don't auto-exercise |
| $55 | Below strike | Expires worthless; no action needed |
Time value shrinks — and shrinks faster near the end
An option's time value doesn't decay evenly. It erodes slowly at first and accelerates sharply in the final weeks. A 60-day option and a 6-day option on the same stock and strike aren't losing time value at the same daily rate — the 6-day option is bleeding it much faster. This effect has a name, theta, and gets its own lesson later.
Choosing an expiration is a real trade-off: longer-dated options cost more but give a move more room to develop; shorter-dated options cost less but leave less time for a slow move to pay off.
Key takeaway: Time is never neutral for an option holder — every day that passes without the stock moving in your favor works against you, even on days the price doesn't move at all.
With strike, premium, and expiration covered, the next module moves into reading a live options chain — starting with what "in the money" actually means.
This lesson is educational content explaining standard options mechanics, not personalized investment or trading advice.
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