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What is the difference between a debit spread and a credit spread?

A debit spread costs a premium up front and caps the gain to limit the risk; a credit spread pays you up front, with a limited profit and limited risk 1. Time passing works against the holder of a debit spread and for the seller of a credit spread 1, while the stock sits near where it started; once the stock is past the strikes, that can reverse 2.

Two spreads on a $50 stock, 30 days, 30% implied volatility (made-up numbers): the $50/$55 call spread (a debit), which needs a rise, and the $48/$45 put spread (a credit), which needs the stock not to fall below $48. Move where the stock ends at expiry.

Source: the StrikePath engine, pricing with the Black–Scholes formula 2 at 4.3% interest a year; a simulated example, not market prices. For learning; not advice.

In numbers

By the formula the call spread costs $1.47 a share: it can make $3.53 and lose $1.47 3. The put spread pays $0.61: it can make that and lose $2.39 4. The first breaks even at $51.47, the second at $47.39 2.

Paid now or paid later

With the debit spread you pay at the start and hope to collect more later; with the credit spread you collect at the start and hope to keep it. Both are limited at both ends: in each, an option bought caps the loss on the one sold 3 4.

What this shows, and what it doesn't

The results at expiry, a share, before fees and the bid-ask spreads. Options sold in either spread can be exercised against you before expiry 5.

Go further

What is a bull call spread? →The debit spread here.What is a bull put spread? →The credit spread here.
Sources (5), checked 20 October 2026 and 27 October 2026
  1. The Options Industry Council, “August Webinar Key Takeaways: Options Trading Strategies - Debit and Credit Spreads” (September 2025). Read it (read 27 October 2026)
  2. Fischer Black and Myron Scholes, “The Pricing of Options and Corporate Liabilities”, Journal of Political Economy 81(3), 637–654, 1973. Read it (read 20 October 2026)
  3. Fidelity, “Bull call spread” (Options Strategy Guide). Read it (read 27 October 2026)
  4. Fidelity, “Options strategy: The bull put spread” (Viewpoints, 25 January 2025). Read it (read 27 October 2026)
  5. FINRA, “Trading Options: Understanding Assignment” (14 December 2020). Read it (read 27 October 2026)

Now try it on a scenario of your own

Pick where a simulated stock might be, and by when: drag one dot and see, side by side, what buying shares, one option, or a pair of options (a call or put spread) would each do. Free, no sign-up.

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