Understand Theta and Time Decay
Theta is the option Greek associated with the effect of time on an option's value. This course explains why option value can change even when the underlying asset barely moves, and why expiration creates an important difference between long and short option positions.
Start This Course →
Learn How Time Works for Buyers and Sellers
You will compare positive and negative Theta and see how the same passage of time can help one side of an option contract while working against the other. The course connects these ideas directly to the long-call, short-call, long-put and short-put positions learned in Levels 1–4.
- Understand what Theta measures.
- See why option premium tends to decay as expiration approaches.
- Compare Theta from the buyer's and seller's perspective.
- Interpret positive and negative Theta.
- Connect time decay to T+0 and practical position behavior.
Use Theta in Practical Trading Decisions
The original course extends the concept into income-generation approaches such as covered calls and cash-secured puts and introduces how time decay appears in more advanced structures. You will also begin to see the relationship between Theta and the other Greeks.
Prepare for Vega, Delta and Advanced Greeks
Level 5 is the first dedicated Greeks course in the sequence. Once you understand how time affects option value, you are better prepared to study volatility through Vega and directional sensitivity through Delta.
Course requirements
- Completion of Levels 1–4 is strongly recommended.
- Know the basic long call, short call, long put and short put positions.
- Basic familiarity with option premium, strike and expiration.
Intended audience
- Beginner options traders ready to learn the Greeks.
- Option buyers who want to understand the cost of time.
- Option sellers who want to understand why time decay may benefit premium-selling positions.
