Strike Prices & Expiration Dates
How Options Work
Key Takeaways
- The strike price determines your risk/reward. Further OTM means cheaper premium but lower probability.
- Expiration defines how long your trade has to work. 30-45 DTE is the sweet spot for selling.
- Weekly options decay faster; monthly options give more time and are more liquid.
TL;DR
Strike price is the predetermined price at which your option can be exercised. Expiration date is the deadline. For sellers, 30-45 days to expiration hits the optimal balance of premium collected vs. time risk.
Strike Price Basics
The strike price is the price at which you can buy (call) or sell (put) the underlying stock. It's the most important decision in any options trade because it determines your:
- Premium: Higher probability strikes (closer to the money) pay more premium
- Probability of profit: Further OTM strikes win more often but pay less
- Risk/reward: Closer strikes mean more premium but a higher chance of assignment
ITM, ATM, and OTM
In the Money (ITM): The option has intrinsic value right now.
- Call: stock is above the strike ($55 call when stock is $60)
- Put: stock is below the strike ($50 put when stock is $45)
At the Money (ATM): Strike is at or very near the current stock price.
Out of the Money (OTM): No intrinsic value.
- Call: stock is below the strike ($55 call when stock is $50)
- Put: stock is above the strike ($50 put when stock is $55)
Most income sellers target OTM strikes. You collect premium and the stock has to move against you before you're at risk.
Powered byStanalystChoosing a Strike for Selling
When selling options (CSPs or covered calls), use delta as your guide:
0.10-0.15 delta: Very conservative. ~85-90% win rate, but low premium.
0.20-0.30 delta: The sweet spot. ~70-80% win rate with meaningful premium. Most popular for the wheel strategy.
0.30-0.40 delta: Aggressive. Higher premium but ~60-70% win rate and more frequent assignment.
Your broker's options chain shows delta for every strike. Start at 0.20-0.30 delta and adjust based on your conviction.
Expiration Date Basics
The expiration date is the deadline for your options contract. After this date, the option ceases to exist.
Common expirations:
- Weekly (7 days): Fast decay but little room for error
- Monthly (30-45 days): Ideal for sellers, balances premium vs. risk
- Quarterly (60-90 days): More premium, but slower decay and longer exposure
- LEAPS (1-2 years): Long-term, mostly used by buyers
The 30-45 DTE Sweet Spot
Research from tastytrade and other options firms consistently shows that 30-45 days to expiration (DTE) is optimal for premium sellers. Here's why:
- Theta decay accelerates meaningfully in this window
- Premium is still substantial (unlike weeklies where most decay already happened)
- You have time to adjust if the trade goes against you
- Gamma risk is manageable (unlike the final week)
Sell at 30-45 DTE, close at 50% profit (typically around 15-25 days in). Repeat.
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