The bull call spread (sometimes called a "long vertical call" or "debit call spread") is the workhorse of disciplined bullish options trading. You give up unlimited upside for a 30-50% reduction in entry cost — a trade that has positive expectancy whenever IV is elevated.
The structure
Buy one call at strike A (typically slightly OTM)
Sell one call at higher strike B (further OTM), same expiration
You pay net debit. Max loss = debit. Max profit = (B − A) − debit. Profitable if the underlying expires above your breakeven (A + debit).
When to use it instead of a long call
The decision rule is brutally simple:
IV rank < 30 → long call. Options are cheap; pay for unlimited upside.
IV rank 30-50 → either works. Choose based on your target — if your target is right at the short strike, the spread is more efficient.
IV rank > 50 → bull call spread. The short leg you sell offsets a meaningful chunk of the elevated premium you'd otherwise overpay on a naked long.
Strike selection by delta
Professional convention:
Long leg: 0.40-0.45 delta — close enough to ATM that you're not burning theta on dead premium, but slightly OTM for leverage.
Short leg: 0.20-0.25 delta — far enough out that you keep upside until you're well in profit.
OptionsDeck's contract picker selects these automatically when the AI Strategist proposes a bull call spread — it scans the live chain and snaps to the listed contracts with the tightest spread and highest open interest at the target deltas.
Reading the regime first
Before opening any bullish vertical, check three things on OptionsDeck:
Spot vs gamma flip — bullish trades have higher hit rate when spot is above the flip
Recent unusual flow — buyer-initiated call sweeps confirm direction
Distance to nearest call wall — your target should be at or below that wall, not through it
Trade the template
Open the Strategy Builder, click "Bull Call Spread (5-wide)", and the strikes auto-set. Or ask the AI Strategist for a bullish trade on your ticker — it'll often propose a bull call spread when IV is elevated.
Frequently asked questions
Bull call spread vs long call — which is better?
Long call: unlimited upside, but expensive in elevated IV. Bull call spread: capped upside, but ~30-50% cheaper. In IV rank below 30 → favor long call. Above 50 → favor the spread.
What strikes to pick?
Long leg ~0.40-0.45 delta (slightly OTM but close to ATM). Short leg ~0.20-0.25 delta. Width depends on your conviction — narrower = cheaper but smaller reward; wider = larger reward but pricier.
When do I take profit?
When the spread reaches 70-80% of max value. Don't wait for full convergence to width — gamma risk near expiration can reverse you quickly.
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