Option Spreads: Bull Call Spreads, Bear Put Spreads, and Vertical Spreads Explained

Debit Spreads vs Credit Spreads

Debit Spreads (Bull Call Spread, Bear Put Spread)

Debit spreads are purchased for a net cost (debit) and benefit from the underlying moving in your direction. A bull call spread: buy a lower-strike call, sell a higher-strike call, net debit. You pay less than buying the lower call alone but cap your upside at the higher strike. Maximum profit = strike width minus debit paid. Maximum loss = debit paid. A bear put spread: buy a higher-strike put, sell a lower-strike put, net debit. Same mechanics but for bearish direction. Debit spreads have positive theta? No — debit spreads actually suffer from time decay (negative theta) because you are net long options. However, the short option reduces the theta decay compared to a naked long option. Debit spreads are best when you have a directional view and want defined risk with lower cost than buying a naked option. Compare spreads to other strategies →

Credit Spreads (Bear Call Spread, Bull Put Spread)

Credit spreads are sold for a net credit and benefit from the underlying staying flat or moving in your favor. A bear call spread: sell a lower-strike call, buy a higher-strike call, net credit. You collect premium upfront and keep the full credit if the underlying is below the short strike at expiration. Maximum profit = credit received. Maximum loss = strike width minus credit received. A bull put spread: sell a higher-strike put, buy a lower-strike put, net credit. Same mechanics for bullish direction. Credit spreads have positive theta — you benefit from time decay as the options lose value each day. Credit spreads are the preferred strategy for income generation because they profit from both time decay and flat markets. Most professional traders prefer credit spreads over debit spreads because the probability of profit is typically higher (60% to 80%) and the time decay works in your favor. Learn covered calls, a type of credit spread →

Probability of Profit: Debit vs Credit Spreads

Credit spreads typically have a higher probability of profit than debit spreads because you are selling options that are out-of-the-money. A bull put spread with the short put at 20 delta has approximately an 80% probability of profit. A bull call spread (debit) with the long call at 30 delta has approximately a 30% probability of profit. The trade-off is that credit spreads have smaller maximum profits relative to maximum losses (typically risk $2 to make $1), while debit spreads have larger maximum profits relative to maximum losses (potential to make $3 for every $1 risked). Credit spreads win frequently but lose bigger when wrong. Debit spreads lose frequently but win bigger when right. Neither is inherently better — the choice depends on your trading style, win rate, and risk tolerance. Most income-focused traders prefer credit spreads for consistent returns, while event-driven traders prefer debit spreads for asymmetric upside. Understand probability in options trading →

How to Select Spread Strikes and Widths

Strike selection for vertical spreads depends on your outlook and risk tolerance. Wider spreads (e.g., $10 width instead of $5) increase both maximum profit and maximum loss proportionally. A $5-wide bull call spread with $2 cost has max profit of $3 (150% return). A $10-wide spread with $4 cost has max profit of $6 (150% return — same percentage return but larger dollar amounts). For debit spreads, look for a cost that is 30% to 50% of the spread width (the breakeven is 30% to 50% through the spread). For credit spreads, look for a credit that is 25% to 40% of the spread width (you profit if the underlying stays within that range). The sweet spot for most traders is $5 to $10 wide spreads on liquid underlyings like SPY, QQQ, AAPL, and MSFT. Wider than $10 and the capital at risk becomes significant. Narrower than $2.50 and commissions eat into profits. Always use limit orders for spreads to ensure you get the desired net debit or credit. Use Greeks to fine-tune your spread entries →

What is the maximum loss on a vertical spread?

For debit spreads, maximum loss is the net debit paid. If you pay $2.00 for a $5-wide bull call spread, the most you can lose is $2.00 per share ($200 per contract). This occurs if the underlying is below the long strike at expiration. For credit spreads, maximum loss is the width of the spread minus the credit received. If you collect $1.50 for a $5-wide bear call spread, maximum loss is $5.00 - $1.50 = $3.50 per share ($350 per contract). This occurs if the underlying is above the short strike at expiration. The defined-risk nature of vertical spreads is their primary advantage. You know exactly how much you can lose before entering the trade, which allows precise position sizing and risk management. Compare this to naked options, where a call buyer's loss is capped at the premium but the return profile is more leveraged, or option sellers who face undefined risk. Vertical spreads sit in the middle — defined risk, defined reward, and lower capital requirements than naked options.

When should I close a vertical spread early?

Closing vertical spreads early is often more profitable than holding to expiration. For credit spreads, the general rule is to close when you have captured 50% to 75% of the maximum profit. For example, if you collected $1.50 on a bear call spread, close the spread for $0.40 to $0.75 when the underlying moves in your favor. This frees up capital and eliminates the risk of a late reversal destroying weeks of accumulated time decay. For debit spreads, close when the spread has achieved 75% to 100% of its maximum value. If your bull call spread has a maximum value of $5.00 and is currently worth $4.00, close and take the profit. The final dollars of profit carry disproportionate risk because gamma risk spikes in the final week. Many traders avoid holding spreads through expiration week entirely due to pin risk — the risk that the underlying closes exactly at a strike price, creating uncertainty about assignment. Close by 3:30 PM on expiration day at the latest. Set spread management rules →

How are spreads taxed differently than naked options?

Vertical spreads are taxed as Section 1256 contracts if on broad-based indexes (SPX, NDX, RUT) or as standard options on individual equities. Index spreads (on SPX, NDX, RUT) receive the 60/40 tax treatment: 60% of gains are taxed as long-term capital gains and 40% as short-term, regardless of holding period. This is a significant advantage for active traders because the effective tax rate is lower than short-term rates. Equity option spreads (on AAPL, SPY, QQQ) do not qualify for 60/40 treatment unless held for more than one year. SPY and QQQ options are classified as equity options, not index options, even though they track indices. If you want the 60/40 tax benefit, trade options on the index itself (SPX instead of SPY, NDX instead of QQQ). Index options also have cash settlement, eliminating assignment risk. The trade-off is that index options typically have wider bid-ask spreads than their ETF counterparts. Consult a tax professional for your specific situation. Learn about capital gains tax treatment →

Can I adjust a spread if it moves against me?

Yes, you have several adjustment options if a spread moves against you. Rolling the spread to a different strike or expiration is the most common. If your bull call spread with strikes at $100/$105 is threatened because the stock dropped to $95, you can roll the entire spread down to $90/$95 — closing the $100/$105 spread (buy back the short $105 call, sell the long $100 call) and opening the $90/$95 spread. This requires additional capital but gives the stock more room to recover. Another adjustment is adding a second spread on the opposite side to convert the position into an iron condor. If your bull put spread at $100/$95 is threatened, you can add a bear call spread above the market to collect additional credit and create a range-bound trade. The most important rule: do not adjust a spread more than once or twice. If the underlying continues to move against you, close the trade and accept the defined loss. Repeated adjustments turn a defined-risk spread into an undefined-risk nightmare. Find a broker with good spread management tools →

Related Resources