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Calculate a bullish call debit spread13 minute read
Bull call spread max profit, loss, and break-even
Calculate bull call spread maximum profit, maximum loss, expiration break-even, contract value, fees, and outcomes before and at expiration.
Prepared by Mark · Primary sources below
Direct answer
A bull call spread buys a lower-strike call K1 and sells a higher-strike call K2 with the same expiration, where K1 < K2. Let D be the net debit per share before costs. Maximum expiration loss is D. Maximum profit is K2 - K1 - D. The break-even stock price is K1 + D. Multiply per-share results by the contract multiplier and number of spreads, then include commissions and exercise or assignment charges.
Start with the actual net debit
Subtract premium received for the short call from premium paid for the long call. Use the filled combination price rather than adding stale last trades from separate legs.
The debit must use the same per-share basis as the strikes. A quoted debit of 1.80 normally represents 180 for one standard 100-share spread before fees.
The strike width caps the spread value
At or above K2 at expiration, both calls are in the money and their intrinsic values differ by exactly K2 - K1. The spread cannot become worth more than that width at expiration.
Maximum profit therefore equals width minus debit. If K1 is 100, K2 is 105, and D is 1.80, maximum profit is 3.20 per share, or 320 for one standard spread before costs.
The debit is the expiration loss floor
At or below K1, both calls expire without intrinsic value. The opening 1.80 debit is then the maximum loss, or 180 per standard spread before costs.
Between the strikes, expiration P&L rises one-for-one with stock price: stock price minus K1 minus D. Setting that expression to zero gives a break-even of 101.80.
Costs and quantity change account results
For N spreads with multiplier M, gross maximum profit is (K2 - K1 - D) × M × N and gross maximum loss is D × M × N. Subtract all entry and exit costs from profit and add them to loss.
A debit entered above the strike width would lock in an expiration loss before costs. Validate the order price and contract specifications rather than assuming every displayed combination is economically sensible.
Before expiration, the straight-line formula is incomplete
The formulas describe intrinsic-value P&L at expiration. Earlier, both calls retain time value and react differently to spot, implied volatility, skew, dividends, rates, and bid-ask spreads.
The position can show a loss above the expiration break-even or a gain below it. A short call can also be assigned early, especially around dividends, leaving short stock while the long call remains open.
Common questions
What is the bull call spread maximum-profit formula?
Subtract the per-share net debit from the distance between the higher short-call strike and lower long-call strike. Multiply that result by the contract multiplier and number of spreads, then subtract commissions and expected closing or settlement costs. Maximum profit occurs at or above the short strike at expiration.
Can a bull call spread lose more than the debit paid?
Its standard matched expiration payoff is limited to the opening debit, but account cash flows can exceed that simplified figure because of commissions, exercise charges, early assignment, temporary stock exposure, financing, or a mismatched quantity. Confirm both legs, multiplier, settlement style, and broker handling before relying on the label defined risk.
Why is break-even lower strike plus debit?
Between the two strikes at expiration, only the lower long call has intrinsic value. Its value is stock price minus K1. The spread recovers its original debit when that intrinsic value equals D, so stock price equals K1 + D. This is an expiration equation and does not predict the price needed to exit profitably earlier.
Does a wider bull call spread always offer a better return?
No. A wider spread raises the maximum possible terminal value but normally costs more and can expose more capital. Return also depends on where both strikes sit relative to spot, the probability and timing of the forecast, implied volatility, liquidity, and exit price. Compare maximum dollars, return on debit, break-even distance, and realistic scenarios together.
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