Bull Put Spread Strategy: Defined-Risk Premium Collection

You are bullish or neutral on a stock trading at $100. You want to collect premium from selling puts but you do not want to tie up $10,000 in cash (as a cash-secured put requires). You also do not want unlimited downside risk if the stock crashes.

A bull put spread solves this problem. You sell a put at one strike and buy a protective put below it. You keep the net credit, profit from time decay, and your risk is capped at the difference between the two strikes minus the credit received. You use a fraction of the capital and define your risk from entry.

This is the stepping stone between cash-secured puts and outright selling — a way to collect premium with defined risk and capital efficiency.

What Is a Bull Put Spread?

A bull put spread (also called a put credit spread) has two legs:

1. Sell a put at a higher strike (e.g., $95) — collect premium
2. Buy a put at a lower strike (e.g., $90) — pay premium to define risk

You keep the net credit. At expiration, three outcomes are possible:

Stock above the higher strike ($95): Both puts expire worthless. You keep the full credit. This is max profit.

Stock between the two strikes ($90-$95): The short put is ITM, the long put is OTM. You exercise your right to the put spread and keep a reduced profit (stock price − lower strike).

Stock below the lower strike ($90): Both puts are ITM. Your loss is capped at the width of the strikes minus the credit received. This is your max loss, known from entry.

Mechanics: Sell the $95 put for $2.00, buy the $90 put for $0.50. Net credit = $1.50. Max profit = $150. Max loss = (width of $5) − $1.50 credit = $3.50, or $350 per contract.

Real example: Intel (INTC) is trading at $30. You are bullish or neutral. You sell the $28 put for $1.20 and buy the $25 put for $0.40. Net credit = $0.80, or $80. Max loss = ($28 − $25 = $3 width) − $0.80 credit = $2.20, or $220. You risk $220 to make $80. Return on risk = 36% if the stock stays above $28.

Why Bull Put Spreads Work: Capital Efficiency + Defined Risk

Two forces make bull put spreads attractive for premium collectors:

1. Defined Risk from Day One

Unlike a cash-secured put (which has undefined max loss if the stock crashes below zero), a bull put spread caps your loss at the strike width minus credit. You know the worst-case loss before entry. There is no surprise.

2. Capital Efficiency

A cash-secured put on a $100 stock requires $10,000 in buying power (to cover 100 shares at the strike). A bull put spread with a $5 width requires only $500 in margin ($5 × 100). You deploy the same premium-collecting edge with 5% of the capital.

This frees up capital for other trades or hedges.

3. Stepping Stone to More Aggressive Strategies

Bull put spreads let new premium sellers practice risk management on a smaller capital base. As you prove profitability, you can graduate to cash-secured puts or naked short puts with more capital.

The Payoff Structure

Let's walk through a bull put spread in detail.

Setup:

• Stock: Costco (COST), trading at $900
• Outlook: Neutral to mildly bullish. No catalyst for a sharp decline in the next 45 days.
• Trade: Sell the $870 put, buy the $850 put, both expiring in 45 days
  • Sell $870 put for $2.50 = collect $250
  • Buy $850 put for $0.80 = pay $80
  • Net credit: $1.70, or $170
  • Max profit: $170
  • Max loss: ($870 − $850 = $20 width) − $1.70 credit = $18.30, or $1,830
  • Risk-to-reward ratio: $1,830 risk to make $170 profit = 10.7:1

At expiration (45 days later):

COST at $875 (up 0.56%, profitable for you): The $870 put is worth $0 (OTM by $5). The $850 put is worth $0 (OTM by $25). Both expire worthless. You keep the full $170 credit. P&L: +$170 (100% return on the $170 credit).

COST at $860 (slightly down, partial loss): The $870 put is ITM, worth $10. The $850 put is OTM, worth $0. Your spread is worth $10, which you owe. Loss: $10 (intrinsic value) − $1.70 credit = $8.30, or $830. P&L: −$830.

COST at $850 (max loss zone): The $870 put is ITM, worth $20. The $850 put is worth $0 (ATM, likely still has minimal extrinsic). Your spread width is $20. Loss: $20 − $1.70 credit = $18.30, or $1,830. P&L: −$1,830 (max loss).

COST at $820 (sharp decline): The $870 put is ITM, worth $50. The $850 put is ITM, worth $30. Your spread is worth $50 − $30 = $20 (the width). Loss: $20 − $1.70 credit = $18.30, or $1,830. This is still max loss; the long put protects you from further losses.

ASCII Payoff Diagram

Bull Put Spread Profit/Loss at Expiration
(Sell $870 Put for $2.50, Buy $850 Put for $0.80, Net: $1.70 credit)

  +$170 ┤  ─────────────────────────  Max profit: $170
        │                         ╲
     $0 ┼─────────────────────────╲─  Breakeven: $868.30
        │                         ╲
  -$500 ┤                         ╲
        │                          ╲
 -$1830 ┴────────────────────────────  Max loss: $1,830
       $820  $850  $870  $900  $920  $950
              Stock Price at Expiration

Bull Put Spread vs Cash-Secured Put: The Capital Efficiency Table

Factor	CSP (Sell $870 Put)	Bull Put Spread ($870/$850)
Margin Required	$87,000 (to cover 100 shares)	$2,000 (width × 100)
Credit Collected	$2.50 ($250)	$1.70 ($170)
Return on Margin	0.29% (monthly)	8.5% (monthly)
Max Loss	Undefined; stock could go to $0, you lose $85,000	Capped at $18.30 ($1,830)
Risk Management	No defined stop; you own stock if assigned	Defined risk from entry

Key insight: The bull put spread uses 2.3% of the margin for 68% of the credit. You sacrifice some premium ($80) to gain capital efficiency (96% less margin) and defined risk. For traders with smaller accounts, this is a huge win.

Setup Mechanics

Step 1: Choose Your Strikes

Strike selection controls your probability, your credit, and your max risk.

Width Selection (Strike Separation):

Most bull put spreads are 5 or 10 wide (e.g., sell $95, buy $90 = 5-wide).

• 5-wide spread: Max loss is $500. Lower absolute risk. Lower credit ratio.
• 10-wide spread: Max loss is $1,000. Higher absolute risk. Higher credit collected per dollar of width.

Choose based on your risk tolerance and account size. A beginner should use 5-wide spreads ($500 max risk). An experienced trader can use 10-wide ($1,000 max risk).

Strike Placement (Probability):

Where you place the short strike determines your probability of profit (POP).

• 0.30 delta short strike (70% POP): Sell the $90 put on a $100 stock. Higher probability the stock stays above $90. Smaller credit.
• 0.50 delta short strike (50% POP): Sell the $100 put (ATM). Even odds. Medium credit.
• 0.70 delta short strike (30% POP): Sell the $110 put (ITM). Lower probability but larger credit.

Recommendation: Most traders sell the 0.20-0.35 delta put (70-80% POP). It balances credit size with probability.

Step 2: Choose Your Expiration

Time to expiration controls theta decay and gamma risk.

21-30 DTE (Near-term):

• Theta decays rapidly (positive for you).
• Gamma is high (small stock moves create big P&L swings).
• Good for: directional conviction with a specific near-term catalyst.
• Risk: if the stock moves against you sharply, you are forced to take losses faster.

30-45 DTE (Mid-term, ideal):

• Theta decay is moderate but consistent.
• Gamma is moderate; you have some buffer against sharp moves.
• Good for: the sweet spot for most bull put spreads.
• Risk: minimal if you position size correctly.

45-60 DTE (Extended):

• Theta decay slows; you are paying more time value upfront for less daily profit.
• Gamma is low; position is more stable.
• Good for: lower-conviction trades where you want stability.
• Risk: opportunity cost; your capital is tied up longer for less premium per month.

Recommendation: Trade 30-45 DTE expirations. This is where premium decay works in your favor without creating excessive gamma risk.

Step 3: Calculate Your Credit, Max Profit, and Max Loss

Example:

• Stock: JPMorgan Chase (JPM), trading at $200
• Short put: $190 strike, expiring 35 days out, sell for $1.50
• Long put: $185 strike, expiring 35 days out, buy for $0.40
• Net credit: $1.10 ($110 per contract)
• Width: $190 − $185 = $5
• Max loss: ($5 width − $1.10 credit) × 100 = $3.90 × 100 = $390
• Max profit: $110
• Risk-to-reward: $390 risk : $110 profit (3.5:1)
• Return on risk: $110 / $390 = 28% if max profit

Greeks Profile for Bull Put Spreads

Delta (Directional Exposure)

A bull put spread is net short delta (negative delta). You are short a put (negative delta) and long a put (negative delta, but smaller in magnitude).

• Short $190 put: delta ~−0.35 (net short delta from this leg)
• Long $185 put: delta ~+0.15 (net positive delta, offsetting some short delta)
• Net delta: −0.20 (slightly bearish; you profit if stock stays flat or rises)

Why it matters: Negative net delta means you want the stock to stay put or rise. A drop hurts. This is why bull put spreads are best used when you are neutral to bullish.

Theta (Time Decay)

For a bull put spread, theta is positive. Every day that passes, your short put loses value faster than your long put, and you profit.

• Short $190 put: theta ~+$0.12/day (you profit from time decay)
• Long $185 put: theta ~−$0.04/day (you lose time decay)
• Net theta: +$0.08/day (profit of ~$8 per day, or ~$280 per month)

Why it matters: Positive theta is the engine of bull put spread profitability. You profit from the passage of time if the stock stays above your short strike. Do nothing, and theta works for you.

Vega (Volatility Sensitivity)

For a bull put spread, vega is slightly negative. Rising implied volatility helps your position slightly; falling IV hurts.

• Short $190 put: vega ~−$0.15 (lower IV hurts the short put you owe)
• Long $185 put: vega ~+$0.08 (lower IV helps the long put)
• Net vega: −$0.07 (slight negative; IV contraction slightly hurts)

Why it matters: The bad news: IV crush (which often happens post-earnings) hurts your spread slightly. The good news: IV expansion (which happens during panic) helps. Your vega risk is small because the long put hedges some of it.

Gamma (Acceleration of Delta)

For a bull put spread, gamma is slightly negative. As the stock drops closer to your short strike, your delta becomes more negative (faster losses).

• Short $190 put: gamma ~+0.01 (positive; delta accelerates)
• Long $185 put: gamma ~−0.005 (negative; offsets some acceleration)
• Net gamma: +0.005 (slightly positive; delta accelerates in your favor if stock rises)

Why it matters: Slightly positive net gamma means if the stock rises, you gain faster. If it falls, you lose faster. This is small risk if you position size correctly and close at max loss.

When to Use Bull Put Spreads

Primary Use Cases

1. You are neutral to mildly bullish on a stock and want to collect premium without undefined risk.

2. Implied volatility is elevated (IV Rank > 40). Higher IV means fatter premiums. Selling into high IV is ideal.

3. You have limited capital or want to maximize return-on-capital. Bull put spreads use 2-5% of the margin a CSP would require.

4. You want defined risk. You know your max loss before entry. No surprises.

5. You want theta exposure. You profit from the passage of time without needing the stock to move.

Do NOT use bull put spreads when:

• You expect the stock to drop sharply. This trade needs the stock to stay flat or rise.
• IV Rank is at all-time lows (< 20). Premiums are thin; effort is not worth the reward.
• You have a strong bearish conviction. Use bear call spreads or long puts instead.
• The stock is in a strong downtrend. You are fighting momentum.

Real-World Example

Setup:

Adobe (ADBE) is trading at $620. The stock has been consolidating for two weeks; you expect it to stay range-bound for the next 30 days. IV Rank is at 55 (elevated, good for selling). You decide to sell a bull put spread.

Decision:

• Sell the $600 put, 30 DTE, for $2.40 = $240
• Buy the $590 put, 30 DTE, for $0.70 = $70
• Net credit: $1.70 = $170 per contract
• Max loss: ($10 width − $1.70 credit) × 100 = $830
• Break-even price: $600 − $1.70 = $598.30

Scenario 1: ADBE stays at $620 through expiration

The $600 put expires worthless. The $590 put expires worthless. You keep the full $170 credit. P&L: +$170 (100% return in 30 days, 1,200% annualized).

Scenario 2: ADBE drops to $605 by expiration

The $600 put is OTM by $5; worth $0. The $590 put is way OTM; worth $0. You keep the full $170 credit. P&L: +$170. The drop did not materialize, but your spread is still profitable because you sold the right strike.

Scenario 3: ADBE drops to $598.30 (breakeven)

The $600 put is ITM by $1.70; worth $1.70. The $590 put is OTM; worth $0. Your loss on the short put is $1.70, which exactly equals your credit. P&L: $0. You break even.

Scenario 4: ADBE crashes to $580

The $600 put is ITM, worth $20. The $590 put is ITM, worth $10. Your spread is worth $20 − $10 = $10 (the width). Loss: $10 − $1.70 credit = $8.30 per share, or $830. P&L: −$830 (max loss). Your long $590 put protects you from further losses.

This example shows the bull put spread in action: you profit from theta and volatility contraction if the stock stays flat. You take a defined loss if it drops sharply. Your win rate is high (stock needs to stay above $598.30).

Risks and Gotchas

1. Early Assignment (Rare but Possible)

Your short put is deep ITM and the stock pays a dividend before your expiration. You could be assigned early, forced to buy 100 shares at your strike price. Your long put protects you (you sell the shares at the lower strike), but you lose the time value.

Mitigation: Check dividend dates before opening the spread. If a dividend is coming within days, avoid the position.

2. Undefined Max Loss If You Sell Without a Protective Put

If you sell a naked short put (no long put to buy), your max loss is undefined (stock could go to zero, you'd own 100 shares at your strike price and lose everything). This is a common mistake. Always buy the protective put.

Mitigation: Never sell a put without buying a lower-strike put to define risk. A spread protects you; a naked put does not.

3. Whipsaw Near Expiration

You sell the $600 put when ADBE is at $620. With 3 days to expiration, ADBE drops to $598, and your $600 put is deep ITM. You panic and close the spread for a $500 loss. The next day, ADBE bounces back to $615, and your spread would have been max profit.

Mitigation: Set your max loss point before entry. If the stock hits it, close the position without emotion. Do not hold and hope.

4. Gamma Risk if You Don't Close Early

With 1 day to expiration, your $600 put has very high gamma. If ADBE drops from $602 to $598 overnight, your position goes from +$150 to −$830 instantly. The gamma acceleration is brutal.

Mitigation: Close bull put spreads 7-10 days before expiration if they are profitable. Let someone else deal with gamma risk.

5. Low Credit for the Width

You sell a 10-wide bull put spread for only $1.00 of credit. Your max profit is $100, but your max risk is $900. Return-on-risk is only 11%. Not worth the effort.

Mitigation: Only trade spreads where the credit is at least 15-20% of the width. Sell 5-wide for $1.00+ credit, or 10-wide for $2.00+ credit.

Pros and Cons

Pro	Con
Defined risk from entry; max loss is known	Max profit is capped (credit collected)
Capital efficient; uses 2-5% of CSP margin	Requires managing max-loss discipline
Profits from theta decay	Loses if stock drops sharply
Works in neutral to bullish markets	Profits are small relative to risk
High probability of profit (60-70%) if strikes chosen well	Requires selling when IV is adequate
Vega hedged (long put offsets some of short put vega)	Gamma risk if held too close to expiration

How to Find Bull Put Spread Candidates

1. Screening for High IV

Use our Daily Signals to find stocks with:

• IV Rank > 40 (elevated, good for selling)
• No earnings or FDA events in the next 45 days
• Stable or slightly bullish technical setup

2. Strike Selection Checklist

For each candidate:

• Sell the 0.20-0.35 delta put (70-80% probability it stays OTM)
• Buy the put 5 strikes (for a 5-wide) below the short strike
• Verify credit is at least 15-20% of the width
• Check bid-ask spread on both legs; combined spread should be < 3% of net credit

3. Liquidity Verification

Confirm:

• Open interest > 100 contracts on both strikes
• Average daily volume > 50 contracts per expiration
• Tight bid-ask spreads (< $0.05 on puts trading at or above $0.50)

4. Position Sizing

Risk no more than 2% of your account on a single spread:

• Max loss ÷ account size = % risk per trade
• If your account is $10,000 and max loss is $500, you are risking 5% per spread (too much)
• Reduce to 1-2% by selling fewer contracts or tighter spreads

Close vs Hold at Max Loss

The discipline decision: Once your spread hits your max loss (the width), do you close immediately or hold for expiration (hoping the stock rebounds)?

Close: Lock in the loss, free up capital for new opportunities. Most pros do this.

Hold: Save bid-ask friction on the close, but risk gamma whipsaws and emotional pain.

Recommendation: Close at max loss or 7-10 days before expiration, whichever comes first. Defined risk means you execute your plan, not hope.

The Bottom Line

Bull put spreads are the middle ground between selling premium safely and maximizing return-on-capital. They are defined-risk, theta-positive, and capital-efficient. The catch is your max profit is capped, and you need the stock to stay flat or rise.

Success with bull put spreads comes from:

1. Selling high IV. Wait for IV Rank > 40. Thin premiums are not worth the effort.
2. Strike selection. Sell 0.20-0.35 delta; buy 5 strikes below to define risk.
3. Position sizing. Risk no more than 2% of your account per spread.
4. Early close discipline. Close at max profit or max loss; do not hold to the last day hoping.

Done right, bull put spreads are a reliable, repeatable way to harvest premium with known risk.

---

Start Using This Strategy

Find stocks poised for consolidation with elevated IV and optimal bull put spread setups.

• Find stocks favored for bull put spreads
• See today's bull put spread ideas
• Read the methodology

---

This is analysis, not advice. We help you understand the landscape — you make your own decisions.