Understanding Delta for Strike Selection
Delta tells you roughly how likely an option is to expire in the money. A -0.25 delta put has about a 25% chance of being assigned. Here's how different delta levels play out:
| Put Delta | Assignment Probability | Typical Premium | Best For |
Most experienced wheel traders settle on 20-25 delta as the sweet spot. You get assigned about once every 4-5 cycles, which keeps the income flowing without constant assignment headaches.
Selecting Put Strikes: The Process
Step 1: Check the current stock price and implied volatility. AMD is at $135 with 40% IV.
Step 2: Look at the option chain for your target expiration (30-45 DTE). Find the put strikes with deltas near -0.20 to -0.25.
Step 3: Identify support levels. Is there a technical support level that aligns with a 20-25 delta put? If AMD has support at $125 and the $125 put has a delta of -0.22, that's a natural choice. You have both statistical probability AND a price floor working for you.
Step 4: Calculate the premium as a percentage of capital at risk.
$125 put paying $3.40 premium:
If the return meets your target (usually 1.5-3% monthly for mid-volatility stocks), the strike is a go.
Selecting Call Strikes After Assignment
Call strike selection follows different rules because you already own shares. The non-negotiable rule: never sell a call below your adjusted cost basis unless you've already collected enough premium to cover the difference.
Example:
Sell the $127 call (30 DTE) for $3.80. If called away:
If you sell the $120 call instead (below cost basis), you'd be called away at $120 and lock in a $1.60/share loss offset partially by premium. Not ideal.
The Support/Resistance Framework
Beyond delta, technical analysis adds edge:
For puts: Sell at or just above a major support level. If the stock has bounced off $120 three times in the past year, selling a $120 put gives you a natural floor. Even if assigned, you're buying at a level where the stock has historically attracted buyers.
For calls: Sell at or near resistance levels. If the stock stalls at $140 repeatedly, selling $140 calls captures premium while the stock is likely to be capped there anyway.
Adjusting Strikes for Market Conditions
Don't use the same delta in every environment:
High VIX (above 25): Drop to 10-15 delta puts. Premium is rich enough that far OTM strikes still generate good income, and you're less likely to get assigned during volatile periods.
Low VIX (below 16): You might need to sell 25-30 delta puts to generate worthwhile premium. Accept the higher assignment probability or wait for volatility to pick up.
Earnings approaching: Move puts further out of the money or avoid the stock entirely until after the announcement.
Common Strike Selection Mistakes
Chasing premium. The highest-premium strike isn't the best strike. That $130 put paying $7.00 might have a 40% assignment probability, which means you'll be holding shares more often than not.
Ignoring the bid-ask spread. A put that shows $2.50 mid-price but has a $2.20 bid means you're actually getting $2.20. On cheap stocks with wide spreads, this friction erodes returns significantly.
Not adjusting for IV changes. Selling 30 delta puts when IV is at its 52-week high is very different from selling 30 delta puts when IV is at its low. OptionsPilot's strike finder accounts for IV rank so you're always calibrated to current conditions.