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What is the difference between bull call and bull put spreads?
A bull call spread buys the lower-strike call and sells the higher-strike call for a net debit. A bull put spread buys the lower-strike put and sells the higher-strike put for a net credit. Both have a bullish expiration profit profile, and at matching strikes and expiration they produce the same profit profile after financing. The meaningful differences are entry cash flow, execution price, and exercise or assignment mechanics.
A debit or credit describes the opening cash flow. The option types, strikes, expiration and execution price determine the position’s profit. Put-call parity connects the matched structures after financing, so compare the full position with a matching alternative.
Bull call spread vs bull put spread example
XYZ trades at $102. Use the same expiration and $95/$100 strikes. Buy the call spread for a $4 debit or sell the put spread for a $1 credit. The strike width is $5. In this zero-carry example, both positions have the same expiration profit:
- Below $95, each loses $4 per share, or $400 for one standard contract pair.
- At $97, each loses $2 per share, or $200 per pair.
- At $99, each breaks even.
- At or above $100, each earns $1 per share, or $100 per pair.
The stock can finish flat at $102 and both positions earn their maximum profit, because $102 already sits above the $100 upper strike. Debit and credit change how the cash moves at entry; the payoff is the same $100.
Maximum loss and buying power
The call spread’s maximum loss is the $400 debit. The put spread’s $500 strike width less its $100 credit also equals a $400 maximum loss. Both earn up to $100 in the matched example.
Use the executable package price to calculate the actual position, and size from the buying power the broker shows for the complete position under the account’s margin rules. In the matched example that is $400 either way.
Position Greeks and time decay
Net delta, gamma, theta and vega come from the combined option legs. Theta changes with the stock’s position relative to the strikes and the options’ remaining time value. Read the net position Greek at the price and date in the plan. At $102, above the $100 upper strike, both spreads collect theta.
Match strikes and expiration before comparing volatility exposure. Comparing unrelated strikes changes the trade as well as the cash flow.
How to choose between bull call and bull put spreads
Price both packages at the same moment and take the one with the smaller maximum loss: the call spread’s debit against the strike width less the put spread’s credit. In the example both come to $4, so the tie goes to the tighter bid-ask spread and the lower buying-power requirement. The options profit calculator compares entry cost, breakeven, maximum profit, maximum loss and target-date value for both structures.
Exercise and assignment mechanics remain distinct. Each vertical has a short option. Assignment depends on that contract’s strike, moneyness, time value, dividends and exercise terms. A short call delivers a stock-sale obligation; a short put delivers a stock-purchase obligation. Manage the legs and resulting stock position together.
Bottom line
A bull call spread and a bull put spread at matching strikes and expiration are two ways to build the same bullish payoff after financing: one pays a debit and the other collects a credit. Take the one with the smaller maximum loss at the live quotes, then break a tie on liquidity, buying power and assignment mechanics.
Common questions
Bull Call Spread vs Bull Put Spread: FAQ
- Are a bull call spread and a bull put spread both bullish?
- Yes. Both reach maximum expiration value above the higher strike. With matching strikes and expiration, a bull call spread and a bull put spread express the same bullish payoff. Paying a debit or collecting a credit changes the entry cash flow, not the underlying market view.
- Which spread makes money if the stock stays flat?
- Both do when the stock already sits above the short strike. If XYZ stays at $102, a 95/100 call spread bought for $4 finishes with a $1 profit per share. A matching 95/100 put spread sold for $1 also finishes with a $1 profit per share, before costs and financing.
- Do both spreads have the same maximum profit and loss geometry?
- Yes, matched bullish verticals have equivalent expiration profit geometry after financing. For a $5-wide 95/100 spread, a $4 call debit and a $1 put credit each produce a $1 maximum profit, a $4 maximum loss, and a $99 breakeven per share in the zero-carry example.
- Which spread ties up more capital?
- In the $5-wide matched example, both tie up $400. The call spread costs a $400 debit, and the put spread’s $500 width less its $100 credit also leaves $400 of maximum loss. For your account, size from the buying-power requirement the broker shows under its margin rules.
- How does time decay differ between the two?
- Matched call and put verticals decay almost identically, because put-call parity ties them together. Both pay theta with the stock near the lower strike and collect it near the upper strike, whichever way the cash flowed at entry; financing accounts for the small gap.
- Do both carry early assignment risk?
- Yes, when the options are American style. Both contain a short option. Assignment of the short call delivers stock; assignment of the short put requires buying stock. The long option supplies the paired contractual right. Traders manage the spread and any resulting stock position as a complete package.