Spread width is one of the most overlooked decisions in credit spread trading. Too narrow and your credits are tiny after commissions. Too wide and a single loss can wipe out weeks of gains. Here's how to get it right.

What Spread Width Means

The width is the distance between your short and long strikes. If you sell the $185 put and buy the $180 put, you have a $5-wide spread.

Width determines three things:

  • Max loss = Width - Credit
  • Credit received = Generally larger with wider spreads
  • Credit as a percentage of width = Usually worse with wider spreads

    • Comparing Different Widths

    Let's look at AAPL at $195 with a 30 DTE bull put spread. Short strike at $185 (roughly 25-delta) with different widths:

    | Width | Long Strike | Credit | Max Loss | Credit % of Width | Contracts per $5K Risk | $2.50$182.50$0.55$19522%25 $5.00$180.00$1.30$37026%13 $10.00$175.00$2.20$78022%6 | $15.00 | $170.00 | $2.80 | $1,220 | 19% | 4 |

    Notice the $5-wide spread has the best credit-to-width ratio at 26%. This is common — $5 widths tend to offer the most efficient pricing on most stocks.

    Guidelines by Account Size

    Small accounts ($5K-$15K): Stick with $1-$2.50 widths. Your max loss per contract stays low ($50-$200), allowing you to trade 1-3 contracts without overconcentrating.

    Medium accounts ($15K-$50K): $5 widths are the sweet spot. Max loss around $300-$400 per contract, and you can comfortably trade 2-5 contracts.

    Larger accounts ($50K+): $5-$10 widths work well. Wider spreads mean fewer total contracts to manage and lower commission costs relative to credit received.

    Why $5 Widths Are Popular

    There's a reason most credit spread education defaults to $5-wide spreads:

  • Adequate credit. You typically collect $1.00-$2.00 per spread, enough to overcome commissions.
  • Manageable max loss. $300-$400 per contract is easy to size across most accounts.
  • Good fill quality. The long option at $5 away usually has decent liquidity.
  • Reasonable risk/reward. Collecting 25-33% of width is achievable at 20-30 delta.

    • When to Go Narrow ($1-$2.50)

    Small accounts that can't afford a $350+ loss per contract.

    High-priced stocks where even $5 is relatively narrow. A $5-wide spread on AMZN at $190 is proportionally narrow (2.6% of stock price). On a $50 stock, $5 is 10% — that's already quite wide.

    Testing new strategies. Keep risk tiny while you learn.

    Drawback: Commissions eat a larger percentage of your credit. If you collect $0.50 and pay $1.30 in commissions to open and close, that's 26% of your profit gone.

    When to Go Wide ($10-$20)

    Large accounts that want fewer positions to monitor.

    High IV environments where wider spreads still collect premium efficiently.

    Weekly income strategies on SPY or QQQ where you want meaningful credits.

    Drawback: A single max loss hurts more. One $780 loss requires 6 winning trades at $130 each to recover (with $5-wide spreads, one $370 loss requires only 3 wins at $130).

    The Width and Probability Connection

    Here's something not intuitive: wider spreads have slightly higher probability of profit for the same short strike.

    Why? Because the credit is larger, so your breakeven is further from the stock price. A $5-wide spread collecting $1.30 has a breakeven $1.30 below the short strike. A $10-wide collecting $2.20 has a breakeven $2.20 below.

    But the max loss is also much worse, so the expected value is similar.

    My Recommendation

    Start with $5-wide spreads on stocks in the $100-$300 range. This gives you a good balance of credit, risk, and liquidity. Adjust from there based on your specific account size and which stocks you trade.

    Track your results across different widths in OptionsPilot to see if narrower or wider spreads perform better in your actual trading. Theory says they should converge — your data might tell a different story.