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How Does Theta (Time Decay) Affect an Option’s Value?

Theta is the measure of an option's time decay, representing the amount by which an option's price is expected to decrease each day as it approaches expiration. As time passes, the probability of the option becoming profitable diminishes.

This decay accelerates significantly in the final weeks before expiration, negatively affecting the option buyer.

How Does Theta Affect the Value of an Option as Expiration Approaches?
How Does the “Time Decay” (Theta) Affect the Value of an Option?
How Does Time Decay Affect an In-the-Money Call Option?
Does the Risk of Early Assignment Increase or Decrease as the Option Approaches Expiration?