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Why Is Theta Typically Negative for a Long Option?

Theta is typically negative for a long option position (buying a call or put) because time decay reduces the option's value over time. Since the option buyer wants the option's value to increase, the daily erosion of time value represents a loss for them, hence the negative Theta.

Why Is Theta Typically Negative for a Long Option Position?
What Role Does Theta Play in the Decay of an Option’s Extrinsic Value?
In Options Trading, How Does the Concept of “Time Decay” (Theta) Affect the Value of a Derivative?
How Does Theta Affect the Value of an Option as Expiration Approaches?