OTM Distance From the Current Price
How Do I Select Strike Distances for Out-of-the-Money Options?
Selecting the distance of an out-of-the-money (OTM) strike from the current stock price is one of the most consequential decisions in options trading, as it directly determines the probability of profit, the credit or debit paid, and the maximum risk-reward ratio of a position. A call strike 5% above the current price has a much higher probability of staying out-of-the-money than a call strike 1% above, but it also collects less premium. An experienced trader understands the relationship between strike distance, implied volatility, and days-to-expiration, and uses this knowledge to align position probability with their confidence level and risk tolerance. Strike selection also interacts with position sizing; a trader comfortable with only a 30% probability of profit should use a wider OTM distance, while a trader confident in their directional view can select a closer OTM strike.
Quick definition: Out-of-the-money strike distance is the percentage difference between the strike price and the current stock price, affecting probability of profit, premium collection, and maximum loss risk.
Key Takeaways
- OTM strike distance is typically measured as a percentage move from the current price (1%, 2%, 3%, etc.) or as delta (0.30, 0.20, 0.10, etc.).
- A wider OTM distance (5–10% above current price) has a higher probability of profit but collects less premium and has lower maximum loss risk.
- A tighter OTM distance (1–3% above current price) collects more premium and has higher maximum profit potential but lower probability of staying OTM.
- The relationship between strike distance and implied volatility is inverse; high-IV environments allow for tighter strikes while maintaining similar probabilities.
- Professional traders use the "probability of profit" concept, selecting strikes to achieve specific target probabilities (e.g., 65% for income trades, 40% for directional bets).
Understanding Strike Distance as a Percentage
Strike distance is most simply understood as the percentage move required for the option to cross the strike price. If a stock trades at $100 and a trader sells a call at the $102 strike, the distance is 2%. If the trader sells a call at the $105 strike, the distance is 5%. Each percentage point of distance represents a different probability of the stock reaching that price by expiration.
With 30 days to expiration, a stock with 25% annualized volatility moves an average of roughly 1.4% per day. Over 30 days, the expected move is about 2.5% (standard deviation), with a 68% probability of staying within one standard deviation and a 95% probability of staying within two standard deviations. A trader selling a call at 2.5% OTM (one standard deviation) faces approximately a 32% probability of the call being assigned at expiration (or a 68% probability of staying OTM). A trader selling a call at 5% OTM (two standard deviations) faces approximately a 5% probability of assignment (or a 95% probability of staying OTM).
Strike Distance and Delta Relationship
Professional traders typically select strikes based on delta rather than percentage distance, as delta directly reflects the probability the option finishes in-the-money. A call with 0.30 delta has approximately a 30% probability of finishing in-the-money and a 70% probability of staying OTM. A call with 0.20 delta has a 20% probability of finishing in-the-money.
The relationship between delta and percentage distance varies based on implied volatility and days-to-expiration. In a high-IV environment, a given percentage distance corresponds to a lower delta (and thus lower probability) than in a low-IV environment. For example, a 3% OTM call might have 0.25 delta in a 20% IV environment but only 0.15 delta in a 50% IV environment. This is why professional traders use delta as their primary selection criterion; it automatically accounts for volatility and time, whereas percentage distance does not.
Premium Collection and Strike Distance Trade-Off
A trader who sells call spreads must decide on the OTM distance based on the premium they want to collect and the probability of profit they are willing to accept. Selling a call at 1% OTM collects more premium (perhaps $1.50 per spread) but faces only a 50% probability of staying OTM, meaning the trade is, in expected-value terms, a coin flip. Selling a call at 5% OTM collects less premium (perhaps $0.50 per spread) but faces a 90%+ probability of staying OTM, making it a safer trade in terms of probability.
A concrete example: Suppose a trader sells 10 call spreads on a $100 stock, 35 days out. The call is 3% OTM (the $103 strike). With 30% IV, this call has approximately 0.25 delta, implying a 25% probability of finishing in-the-money. The trader collects $1.20 per spread, or $1,200 total. The maximum profit is $1,200 (if the stock stays below $103). The maximum loss is the width of the spread minus the credit collected. If it is a 5-wide spread, the max loss is $5.00 - $1.20 = $3.80 per spread, or $3,800 total. The risk-reward ratio is $3,800 risk to make $1,200 profit, or 3.2:1. In probability terms, the trader needs to win 76% of the time (3.8 / 5.0) to break even. With a 75% probability of the call staying OTM, this trade is slightly favorable.
Strike Distance for Different Strategies
Different options strategies require different OTM distance selections. Covered calls and cash-secured puts are often sold at tighter OTM distances (1–3%) because the trader is comfortable being assigned; the goal is to earn consistent premium rather than to avoid assignment entirely. Naked calls sold for income are typically 5–10% OTM because the gamma and directional risk are highest for naked short positions. Call spreads sold for income typically fall in the 3–5% OTM range, providing a middle ground of premium collection and probability.
Directional trades (buying call spreads to bet on upside) typically use tighter OTM distances (1–3%) because the trader is making a directional bet and wants maximum leverage. A trader who is bullish might buy a $105 call and sell a $110 call (using 5% and 10% OTM strikes, respectively), creating a defined-risk position that profits from an upside move. The trader accepts low probability of making maximum profit (the stock must stay between $105 and $110) in exchange for high leverage if the move occurs.
Adjusting Strike Distance for Implied Volatility
The relationship between IV and optimal strike distance is inverse. In high-IV environments, OTM options are expensive relative to their probability of finishing in-the-money, so a trader should sell further OTM (accepting lower premium but reducing probability of assignment). In low-IV environments, OTM options are cheap relative to their probability, so a trader should sell closer to the money (collecting more premium and accepting higher probability of assignment).
An example: In March 2024, the VIX (implied volatility) was trading at 35%, well above the normal level of 15–20%. A call 3% OTM on a broad stock had 0.30 delta even though it was 3% away, because the high IV made the probability distribution wide. A trader selling these calls was getting paid substantial premium for relatively high probability (30%) of assignment. In contrast, in June 2024, with the VIX at 12%, the same 3% OTM call had 0.15 delta, meaning the probability of assignment was only 15%. A trader would need to sell 2% OTM calls to collect a similar premium, accepting a 25% assignment probability instead.
Using Probability of Profit Targets
Professional traders often select strikes with a specific target probability of profit. For income strategies (selling premium), the typical target is 65–75% probability of profit, which corresponds to selling calls at approximately the 0.25–0.35 delta. For directional trades (buying premium), the probability of profit might be intentionally lower, perhaps 40–50%, because the trader is betting on a larger move and is willing to accept a lower probability in exchange for higher payoff if the bet is correct.
A tactical example: A trader running a covered call strategy targets 65% probability of profit. With a stock at $100 and 30 days to expiration, the trader uses a delta calculator or their broker's platform and selects the call with approximately 0.35 delta. If 30% IV, this might be the $104 call (4% OTM). The trader sells this call and knows, statistically, that there is a 65% chance the call will stay OTM and be profitable. Over a year, executing this strategy 12 times, the trader expects to be profitable 7–8 times and assigned/lose 4–5 times. The cumulative premium collected over the 12 cycles should exceed the assignment losses by a meaningful margin.
Strike Distance and Time Decay Interaction
Strike distance and DTE interact in complex ways. A 3% OTM strike with 60 days to expiration has a much lower probability of assignment than the same 3% OTM strike with 5 days to expiration, because the stock has more time to move 3%. Similarly, a 3% OTM strike with 60 days to expiration in a 50% IV environment has a higher probability of assignment than in a 15% IV environment. Sophisticated traders account for all three factors (strike distance, DTE, IV) when selecting strikes, using a delta as the unifying metric that captures all three.
Strike selection framework
Real-World Examples
In February 2024, a technology stock traded at $180, with 35 DTE and 35% IV. A trader wanted to run a covered call strategy. The trader identified the call with approximately 0.30 delta, which was the $185 strike (2.8% OTM). The trader sold 10 covered calls at $185 for $3.20 per contract, collecting $3,200. Statistically, with 0.30 delta, the probability of assignment was 30%, and the probability of staying OTM was 70%. Over the next 35 days, the stock rallied to $187 and the call was assigned, requiring the trader to sell the shares at $185. The stock's advance meant the trader could have made an additional $200 profit if not assigned ($187 - $185 * 100). However, the $3,200 collected in premium more than offset this opportunity cost, and the trade was successful. Over 12 such covered calls executed throughout the year, the trader expected a high success rate.
Another illustrative case: A retail trader was bullish on a consumer discretionary stock trading at $90 and wanted a directional bet with defined risk. With 30 days to expiration and 28% IV, the trader bought a call spread: long the $92 call (2.2% OTM) and short the $95 call (5.6% OTM). The spread cost $1.50. The trader's maximum profit was the width of the spread ($3.00) minus the debit paid ($1.50), or $1.50. The stock needed to rise above $92 by expiration to make any profit and above $95 to make maximum profit. The probability of the stock finishing between $92 and $95 was perhaps 25%, which seemed low, but the trader was comfortable with a 25% probability of maximum profit ($1.50, a 100% return on the $1.50 debit). The trader was intentionally accepting a low probability of maximum profit in exchange for a high payoff ratio.
Common Mistakes
Choosing too tight a strike distance due to greed: A trader sells call spreads at 1% OTM to maximize premium collected. The strategy has only a 50–55% probability of success, more of a gambling bet than a business. Statistically, this trade loses money over time. The mistake is focusing on the premium collected rather than the probability of profit.
Choosing too wide a strike distance due to fear: A trader is afraid of assignment and sells calls at 8% OTM. The premium collected ($0.30 per spread) is so small that, even after accounting for transaction costs and spreads, the trade has very low return on risk. The trader would be better served collecting more premium and accepting higher probability of assignment.
Misunderstanding the relationship between delta and probability: A trader confuses delta with the probability of a move to the strike. A 0.30 delta call has a 30% probability of finishing in-the-money, not a 30% probability of the stock moving to that strike price. The stock might move to the strike and back out, or never reach it. Delta is the probability of finishing in-the-money at expiration, which is the relevant metric.
Ignoring the current IV regime when selecting strikes: A trader habitually sells calls at 4% OTM without checking current IV. In a high-IV market, the 4% OTM call might have 0.40 delta (40% probability of assignment), not the 0.20 delta (20% probability) the trader expects. Conversely, in a low-IV market, the 4% OTM call might have 0.10 delta, leaving the trader disappointed by the low premium despite the wide distance.
Adjusting strikes reactively instead of proactively: A trader sells calls at the wrong distance because they did not pre-calculate their target probability. Instead, the trader notices that the first trade did not work out and then adjusts. The better approach is to decide on a target probability (e.g., 70% for income strategies) before entering the trade and select the strike that matches that probability.
FAQ
What delta should I target for a consistent income strategy?
For a consistent income strategy (selling premium), target a delta of 0.25–0.35. This corresponds to a 25–35% probability of the option finishing in-the-money and a 65–75% probability of staying OTM. Over many cycles, this provides a reasonable balance of premium collection and win rate.
Is a 50% probability of profit ever acceptable?
Yes, but only if the payoff ratio (maximum profit divided by maximum loss) justifies it. A trade with 50% probability of profit and a 1.5:1 payoff ratio (making $1.50 for every $1 risked) has an expected value of (0.5 * $1.50) - (0.5 * $1.00) = $0.25 per trade, which is positive and profitable. However, most 50% probability trades do not have favorable payoff ratios, so they are best avoided.
Should I adjust my strike distance based on the stock's sector?
Sector-wide IV varies, but on a stock-by-stock basis, implied volatility (which determines delta for a given percentage distance) is what matters. If you are selecting strikes based on delta (the professional approach) rather than percentage distance, you are automatically accounting for sector differences.
How do I know if my strike selection is good?
After closing a position, compare your actual probability (did the option finish in-the-money or not) to your expected probability (the delta at the time of entry). Over many trades, your actual outcomes should closely match your expected probabilities. If your actual probability of assignment is much higher than expected, you are selecting strikes too close to the money. If it is much lower, you are too wide.
Can I use the same strike distance for all my positions?
Using the same percentage distance (e.g., always 3% OTM) will result in very different probabilities depending on current IV and DTE. Using the same delta (e.g., always 0.30 delta) will result in similar probabilities regardless of IV and DTE. Delta is the better approach because it automatically adjusts for market conditions.
What happens to my strike distance selection in earnings season?
Earnings announcements elevate IV, which lowers the delta for a given percentage distance. If you normally sell 4% OTM calls with 0.20 delta, earnings-season 4% OTM calls might have 0.15 delta instead. You should adjust to a 3% OTM strike to maintain your target 0.20 delta. Alternatively, you can simply use delta as your selection criterion and not worry about percentage distance.
Related Concepts
- Volatility and DTE
- The Gamma Curve Over Time
- The Theta Decay Curve
- DTE Selection Around Earnings
- Delta Selection Guide
- What Are the Greeks?
Summary
Selecting the optimal OTM strike distance is a fundamental skill that directly impacts the probability of profit and the premium collected in options strategies. Strike distance is best understood through the lens of delta and probability of profit, rather than simple percentage distance, because delta automatically accounts for implied volatility and days-to-expiration. Income strategies typically target 0.25–0.35 delta (65–75% probability of profit), while directional trades might accept 0.15–0.20 delta (50–60% probability) in exchange for better payoff ratios. The relationship between strike distance and implied volatility is inverse; high-IV environments allow tighter OTM distances while maintaining similar probabilities. Professional traders select strikes proactively based on a target probability, rather than reactively adjusting based on premium collected. Consistent application of probability-based strike selection, combined with proper position sizing, forms the foundation of profitable options trading.