Strike Selection — OTM, ITM, and ATM Decoded
How to choose the right strike price for any options strategy
Understanding Moneyness
Every option exists in one of three states relative to the current stock price. This relationship — called moneyness — fundamentally determines the option’s risk profile, cost, and probability of profit.
In-the-Money (ITM): The option has intrinsic value. For calls, the strike is below the stock price. For puts, the strike is above the stock price. Example: Stock at $100, the $90 call is $10 ITM.
At-the-Money (ATM): The strike price equals (or is nearest to) the current stock price. ATM options have the highest time value and the most balanced risk profile.
Out-of-the-Money (OTM): The option has zero intrinsic value. For calls, the strike is above the stock price. For puts, the strike is below. Example: Stock at $100, the $110 call is $10 OTM.
Probability of Profit by Strike
The further out-of-the-money you go, the cheaper the option but the lower your probability of profit. This is the fundamental tradeoff in strike selection.
| Strike Type | Delta | Approx. Prob ITM | Cost | Leverage |
|---|---|---|---|---|
| Deep ITM | 0.80-0.95 | 80-95% | High | Low |
| Slightly ITM | 0.55-0.70 | 55-70% | Moderate-High | Moderate |
| ATM | 0.45-0.55 | 45-55% | Moderate | Moderate-High |
| Slightly OTM | 0.30-0.45 | 30-45% | Low-Moderate | High |
| Far OTM | 0.05-0.20 | 5-20% | Very Low | Very High |
The relationship between cost and probability is not linear — it follows a curve driven by implied volatility. In high-IV environments, OTM options are relatively more expensive because the market is pricing in a higher chance of large moves.
Delta-Based Strike Selection
Professional traders often select strikes by delta rather than by distance from the stock price. This normalizes strike selection across different stocks and volatility environments.
Directional bets (high conviction): 0.60-0.70 delta. Good balance of cost and responsiveness.
Moderate conviction plays: 0.40-0.50 delta (ATM). Maximum time value, balanced risk.
Lottery tickets / hedges: 0.10-0.20 delta. Cheap but low probability. Good for tail risk protection.
Covered calls: 0.25-0.35 delta (OTM). High enough to generate income, far enough to keep shares.
Cash-secured puts: 0.25-0.35 delta. Gets you in at a discount if assigned.
Strike Selection by Strategy
Vertical Spreads
For bull call spreads, buy the ATM or slightly ITM call and sell an OTM call 1-2 strikes higher. The width between strikes determines your max profit and max loss. Wider spreads offer more profit potential but cost more and have lower probability. Narrower spreads are cheaper with higher probability but capped upside.
Iron Condors
Sell the short strikes at 0.15-0.25 delta (1 standard deviation out). This gives roughly 70-85% probability that both shorts expire worthless. The long wings go 1-2 strikes further out to define risk. In high-IV environments, you can go further OTM and still collect meaningful premium.
Covered Calls
Sell calls at a strike where you would be comfortable selling your shares. For income-focused strategies, the 0.25-0.30 delta strike (1 standard deviation OTM) offers the best balance between premium collected and probability of keeping shares. In low-IV environments, consider going closer to ATM to collect meaningful premium.
Buying far OTM options because they are cheap. A $0.20 option that expires worthless 90% of the time is not a bargain — it is a donation to the options market maker. The expected value of far OTM long options is almost always negative after transaction costs.
IV Impact on Strike Choice
Implied volatility changes which strikes make sense. In high-IV environments, OTM options are expensive relative to their probability — favor selling premium (iron condors, credit spreads). In low-IV environments, options are cheap — favor buying premium (long calls, long puts, debit spreads) or going closer to ATM.
IV Rank above 50: Sell OTM options. Go wider on iron condors. The inflated premium pays for the risk.
IV Rank below 30: Buy ATM or slightly ITM options. Debit spreads. Time is cheap, so buy it.
Pre-earnings: IV is inflated. If directional, use spreads to offset vega risk. If neutral, sell strangles or iron condors to capture the post-earnings IV crush.
Key Takeaways
- ITM options are expensive but high probability; OTM options are cheap but low probability
- Select strikes by delta, not dollar distance, to normalize across stocks
- 0.60-0.70 delta for directional conviction, 0.25-0.35 delta for premium selling
- Far OTM long options almost always have negative expected value
- High IV favors selling OTM premium; low IV favors buying ATM options
- Iron condor short strikes at 0.15-0.25 delta give 70-85% win probability
- Always consider the risk-reward ratio of your chosen strike, not just the cost