options strategy
Long Call Spread
A bullish debit spread that reduces cost by selling a higher-strike call against a long call.
Max profit
Spread width − debit paid
Max loss
Debit paid
Breakeven(s)
Long call strike + debit paid
What is a long call spread?
A long call spread (also called a bull call spread or call debit spread) involves buying a call at a lower strike and selling a call at a higher strike, both at the same expiry. You pay a net debit.
The short call reduces the cost of the long call and limits your maximum profit to the spread width. It's a lower-cost alternative to buying a call outright, with defined risk.
When to use it
Use a long call spread when you are moderately bullish on an underlying but don't want to pay full price for a single call. It's particularly useful when implied volatility is elevated — you're buying and selling premium, so IV has a partially offsetting effect.
It's also preferable to a naked long call when you have a specific price target in mind, rather than expecting an unlimited move.
Construction
1. Buy a call at the lower strike (your directional bet — the strike you want the stock to reach)
2. Sell a call at the higher strike, same expiry (your income leg — this caps your gains at the upper strike)
The debit paid is your maximum loss. Choose the strikes so the spread width reflects your price target.
Profit, loss, and breakeven
Max profit: spread width minus the debit paid. Achieved if the underlying closes at or above the short call strike at expiry.
Max loss: the debit paid. Achieved if the underlying closes at or below the long call strike at expiry (both calls expire worthless).
Breakeven: long call strike plus the debit paid.
Key risks
If the underlying stays flat or falls, you lose the full debit paid. Time decay works against the spread near expiry if the stock is between your strikes.
Your gains are capped at the spread width. If the stock surges well past the short strike, you don't participate — which is the trade-off for reducing cost.
Implied volatility changes have a partially offsetting effect since you own and sell options, but the net impact depends on the relative deltas and vegas of both legs.
Model it yourself
Open the Vega Lab dashboard, enter a ticker, and load a live option chain to build a long call spread with real strikes and premiums. The payoff chart and heatmap update in real time as you adjust each leg.
Open dashboard →