How to Calculate Profit Targets on Debit Spreads (40%–50% Rule)
Using this $140/$150 call debit spread trade as an example:
Step 1: Understand Your Entry and Spread Width
Let's say you entered the trade for a net debit of $8.25, and the spread width is $10 (150 strike – 140 strike).
Step 2: Calculate Max Profit
For a debit spread, max profit is calculated as:
Spread Width – Net Debit Paid
So in this case: $10.00 – $8.25 = $1.75 max profit
This means the most you can make per contract is $1.75 ($175) if the trade expires fully in the money.
Step 3: Calculate Your 40% and 50% Profit Targets:
Now you take a percentage of that max profit:
40% of $1.75 = $0.70
50% of $1.75 = $0.88
Step 4: Add Profit to Your Entry Price
Entry = $8.25
40% target: $8.25 + $0.70 = $8.95
50% target: $8.25 + $0.88 = $9.13
Final GTC (Good Till Cancelled) Limit Orders:
Sell at $8.95 for 40% profit
Sell at $9.13 for 50% profit
This is how you systematically take profits without needing to hold until expiration. You are capturing a portion of the available profit and freeing up your capital to move into the next trade, which is key to maintaining consistency and compounding over time.