A bull put spread is a bullish options strategy that collects a premium upfront while using a second put to cap the position’s downside. It can profit when the underlying price rises, moves sideways, or falls modestly. The trade does not require a rally, but it does require the price to hold above the spread’s break-even level at expiration.
Also called a put credit spread, it belongs to the vertical options spread family. Its appeal is straightforward: known potential profit and a calculable maximum loss. The catch is that collecting cash is not the same as earning it, and expiration can create obligations that the payoff diagram does not manage for you.
How a Bull Put Spread Is Structured
A bull put spread combines two puts on the same underlying, with the same expiration date and equal contract quantities:
- Sell to open a put at the higher strike price.
- Buy to open a put at the lower strike price.
The higher strike put normally commands a larger premium than the lower strike put. Selling the first and buying the second therefore produces a net credit. Both legs must have matching contract terms and deliverables for the intended protection to work.
The short put creates an obligation to buy the underlying at its strike if assigned. The long put provides the right to sell at the lower strike. For standard, unadjusted U.S. equity options, one contract generally represents 100 shares, so a quoted premium of $1.50 represents $150 per contract. The SEC’s options investor bulletin covers these rights, obligations and premium conventions.
Buying the lower strike put reduces the credit compared with selling the higher strike put alone. In return, it offsets further downside below the lower strike while the protection remains effective. This trade-off between premium received and downside protection is central to Cboe’s discussion of credit vertical put spreads.
Bull Put Spread Example
Assume a hypothetical stock trades at $105. You expect it to remain above $100 through the chosen expiration and open one spread:
- Sell one $100 put for $2.40 per share, receiving $240.
- Buy one $95 put for $0.90 per share, paying $90.
The net opening credit is $150, or $1.50 per share. The difference between the strikes is $5, giving the spread a $500 strike width per standard contract pair.
These prices are illustrative, not current market quotes. All calculations below exclude commissions, exchange fees, financing charges and taxes. They also assume both legs remain properly matched and that any exercise or assignment is handled as intended.
Maximum Profit, Maximum Loss and Break-Even
The standard expiration formulas are:
- Maximum profit: net credit × contract multiplier × number of spreads.
- Maximum loss: (strike width − net credit) × contract multiplier × number of spreads.
- Break-even price: short put strike − net credit per share.
For the $100/$95 spread, maximum profit is $150, maximum loss is $350, and break-even is $98.50. The Options Industry Council’s bull put spread strategy reference sets out these expiration relationships.
The $150 credit is already included in the $350 maximum loss. Do not subtract it again. Equally, the credit is not extra profit on top of the maximum gain: it is the maximum gain.
What Happens at Expiration?
The spread has three payoff regions. Above the short strike, it earns its full credit. Between the strikes, profit falls dollar for dollar as the stock declines. Below the long strike, the two puts offset further changes in intrinsic value, leaving the maximum theoretical loss.
| Stock price at expiration | Short $100 put intrinsic value | Long $95 put intrinsic value | Net profit or loss per spread |
|---|---|---|---|
| $110 | $0 | $0 | +$150 |
| $100 | $0 | $0 | +$150 |
| $99 | $100 | $0 | +$50 |
| $98.50 | $150 | $0 | $0 |
| $97 | $300 | $0 | −$150 |
| $95 | $500 | $0 | −$350 |
| $90 | $1,000 | $500 | −$350 |
At $99, the short put has $100 of intrinsic value per contract. Subtracting that from the $150 opening credit leaves a $50 theoretical profit. The stock has fallen from $105, yet the spread remains profitable.
At $90, the short put has $1,000 of intrinsic value and the long put has $500. The $500 difference, less the $150 credit, produces the $350 loss.
The table values the options at expiration; it does not promise that an account will finish without shares. A stock price at or near a strike can produce exercise uncertainty, discussed below.
Choosing Strikes and Position Size
Start with the dollar amount you can afford to lose, not the credit you would like to collect. In this example, five spreads collect $750 but expose the position to a $1,750 theoretical maximum loss before costs. A small credit on the order ticket can conceal a much larger commitment.
The short strike expresses the price level you expect the underlying to hold. Placing it farther below the current price provides more room for a decline, but typically produces a smaller credit when comparing otherwise similar spreads. That extra distance is a buffer, not a guarantee.
The long strike determines where further downside becomes offset. Moving it farther away changes both the premium and the amount at risk. A hypothetical $10 wide spread collecting $2 has an $800 maximum loss, compared with $350 for the $5 wide spread collecting $1.50. The extra $50 credit comes with $450 more potential loss.
Compare the credit, width and maximum loss together. The relationship between strike width and options spread risk matters more than whether the premium looks generous in isolation.
Also test the trade against an adverse outcome. One $350 maximum loss would consume more than two $150 maximum gains. A strategy can win frequently and still lose money if its losing trades outweigh its winners. No win rate, assumed or advertised, removes that arithmetic.
Why the Position Changes Value Before Expiration
The expiration break-even is not a reliable trigger for judging profit or loss earlier in the trade. Before expiration, both puts can retain time value, and their prices respond to the underlying price, implied volatility and time remaining. The Options Industry Council’s explanation of options Greeks treats these sensitivities as estimates, not guaranteed price changes.
A bull put spread generally benefits from a rising underlying price. For an out-of-the-money spread, passing time often helps by reducing the cost of buying back the position. But “time is on your side” needs a qualification: the exposure changes as the stock moves relative to both strikes.
Volatility changes affect both options, so part of the effect can cancel. Do not assume every put credit spread always benefits from falling volatility or always has positive time decay. Check the combined position rather than the short put alone.
Suppose the stock remains above $98.50 with several weeks left. The spread could still cost more than $1.50 to close, producing an unrealized loss despite the stock being above expiration break-even. Conversely, a favorable move might allow an early profit without waiting for either option to expire.
Early Assignment and Expiration Risks
The Short Put Can Be Assigned Separately
An American-style short put can be assigned before expiration. Assignment on the example’s $100 put requires purchasing 100 shares for $10,000. That purchase amount is not automatically a $10,000 loss, but it is a cash or financing obligation much larger than the spread’s $350 theoretical risk.
The long $95 put does not automatically exercise simply because the short put was assigned. Action may be needed to manage the shares and remaining option. FINRA’s guidance on assignment in multi-leg options positions addresses these separate obligations and the potential capital or margin consequences.
Before entering, check how your brokerage handles assignment, exercise instructions and account shortfalls. A defined payoff does not mean every account can comfortably carry the resulting stock position.
The Protective Put Can Expire Before the Stock Risk Ends
Expiration deserves attention when the stock finishes between the strikes. If the stock ends at $99, the short $100 put may be assigned while the $95 put expires worthless. You can then hold 100 shares without the protective put.
If those shares subsequently fall to $90, the loss on that continuing position can exceed the original spread’s maximum theoretical loss. The spread’s protection has ended; the stock exposure has not.
Prices near the short strike also create uncertainty about whether assignment will occur, including when prices move after regular trading closes. This is expiration and pin risk in options spreads. Closing both legs before expiration removes those obligations once the closing trade has filled, although the exit price and costs still matter.
Opening and Closing the Spread
Where supported, enter both legs as a spread order with a net credit limit. This sets the minimum combined credit you will accept, rather than relying on two separate fills. Exchange facilities such as Cboe’s complex order book and auction support execution of eligible multi-leg orders.
A limit order does not guarantee execution. Check the bid and ask prices on both options and the quoted market for the combination. A midpoint shown on screen is a reference price, not a promise that someone will trade there.
To close, buy back the higher strike short put and sell the lower strike long put. If the example spread opens for $1.50 and closes for a $0.45 debit, profit is $105 before costs. If it closes for $2.80, the loss is $130.
Set an exit plan before opening: an acceptable profit, a tolerable loss, and a decision point before expiration. Those levels need not be universal percentages. They should reflect the position size, remaining reward and your ability to manage assignment.
Rolling closes the existing spread and opens another. It does not erase the first trade’s result, even when the combined transaction receives another credit. Compare closing versus rolling an options spread using the new exposure and total cash flows, not just the latest premium received.
When a Bull Put Spread Fits the Outlook
A bull put spread fits a view that the underlying will hold above a chosen level through expiration, with acceptance of capped profit and downside risk. It is less suited to a trader who wants unrestricted participation in a large rally: the example earns no more at $130 than at $110.
The decision rests on whether the available credit adequately compensates for the possible loss, execution costs and assignment obligations. Size the position around the loss you can carry, keep both legs intact unless deliberately changing the trade, and decide how to exit before expiration makes that decision more urgent.