Bull Put
Spread

What is a bull put spread?

A bull put spread is a two-leg options strategy built by selling one put option at a higher strike price and simultaneously buying another put at a lower strike in the same expiry. Because the premium collected on the short put exceeds the premium paid for the long put, you receive a net credit at entry. That credit is your maximum profit, and you earn it in full as long as the underlying closes above the short put strike at expiry.

Unlike a debit strategy such as a bull call spread, the bull put spread pays you to wait. Time decay and a neutral-to-bullish market are both your allies. The long put at the lower strike limits the downside — so even though you are a net seller of options, the trade remains defined-risk from the moment you enter.

Key takeaways

• A bull put spread is a moderately bullish to neutral credit spread — you profit when the underlying holds above the short put strike.
• Maximum profit is the net credit received — earned when both puts expire worthless above the short strike.
• Maximum loss is capped at the spread width minus the net credit — far less than selling a naked put.
• Time decay (theta) works in your favour — the position gains value as expiry approaches if the market stays above the short strike.
• No large upside move is needed — flat or rising markets both produce the maximum profit.

How it works

Sell 1 higher-strike put (the short leg) and buy 1 lower-strike put (the long leg) on the same underlying and expiry. The net credit received is the difference between the two premiums. If the underlying stays above the short strike at expiry, both puts expire worthless and you keep the entire credit. If the underlying falls between the two strikes, you retain part of the credit. Below the long put strike, the loss is fixed — the two legs offset each other and the net loss cannot exceed the spread width minus the credit.

On NSE, the bull put spread is one of the most popular income trades on NIFTY and Bank Nifty weekly expiries. Sellers choose short put strikes out of the money to give themselves a buffer, while the bought put provides a floor against a sharp fall. Implied volatility contracting after the trade is entered also helps — lower IV means the short put loses value faster than the long put, widening the profit.

The numbers that matter

Worked NIFTY example

Suppose NIFTY is near 22,500 and you expect it to stay flat or rise into weekly expiry. You sell the 22,400 put at ₹90 and buy the 22,200 put at ₹35. Net credit = ₹90 − ₹35 = ₹55. With a lot size of 75, you collect ₹55 × 75 = ₹4,125 upfront (illustrative figures):

• Breakeven: 22,400 − 55 = 22,345.
• Max profit: ₹4,125, earned if NIFTY expires at or above 22,400.
• Max loss: (22,400 − 22,200 − 55) × 75 = ₹145 × 75 = ₹10,875, if NIFTY expires at or below 22,200.

NIFTY at expiry	Short 22,400 put	Long 22,200 put	Net P&L (1 lot)
22,000	−₹400 loss	+₹200 gain	−₹10,875 (max loss)
22,200 (low strike)	−₹200 loss	Worthless	−₹10,875 (max loss)
22,345 (breakeven)	−₹55 loss	Worthless	₹0
22,400 (high strike)	Worthless	Worthless	+₹4,125 (max profit)
22,700	Worthless	Worthless	+₹4,125 (max profit)

When to use it

• You are neutral to moderately bullish and expect the underlying to hold above a support level into expiry.
• Implied volatility is elevated — you collect richer premiums and benefit from any subsequent IV contraction.
• You want to generate income from time decay without needing the market to move in your favour.
• You want a defined-risk alternative to selling a naked put, which carries far greater downside exposure and margin requirement.

Risks to respect

• Limited profit: unlike a long call, there is no benefit from a large bullish move beyond the short strike — you earn the same credit whether NIFTY rises 100 or 1,000 points.
• Full spread loss if market crashes: a sharp gap-down past the long put strike results in maximum loss — the credit received does not offset the full spread width.
• Margin requirement: despite the defined risk, NSE may block margin against the short put leg; verify with your broker before entry.
• Breakeven erosion by IV rise: if implied volatility spikes after entry, the short put inflates faster than the long put and the mark-to-market loss increases even if the underlying has not moved.

Bull put spread vs bull call spread

Both strategies are moderately bullish and defined-risk, but the entry cash flow is opposite. The bull call spread costs a debit — you pay to enter and need the underlying to rise above the breakeven. The bull put spread receives a credit — time works for you and even a flat market produces the maximum profit. When you are bullish but unsure how far the market will move, the credit spread's neutral-to-bullish range is a structural advantage over the debit spread's need for a directional move.

Bull put spread vs cash-secured put

A cash-secured put sells a single put and requires full collateral to cover potential assignment. The bull put spread uses less capital and caps the downside, making it the more capital-efficient choice when you want to express a bullish view through put selling but cannot or will not lock up large amounts of margin. The trade-off is a lower premium collected, because the long put offsets part of the short put's income.

Frequently asked questions

Is a bull put spread bullish or bearish?

Moderately bullish to neutral. It profits as long as the underlying stays above the short put strike at expiry, allowing you to keep the net credit received.

What is the maximum profit on a bull put spread?

The maximum profit is the net credit received at entry — the premium of the short put minus the premium paid for the long put — multiplied by the lot size. It is earned when both puts expire worthless above the short strike.

What is the maximum loss on a bull put spread?

The maximum loss equals the spread width minus the net credit, multiplied by the lot size. It occurs when the underlying closes at or below the long (lower) put strike at expiry.

How does a bull put spread differ from a bull call spread?

A bull put spread is a credit strategy that pays you at entry and profits from time decay and a neutral-to-rising market. A bull call spread is a debit strategy that requires the market to rally past the breakeven. Both are defined-risk, but the credit spread is more forgiving of a flat market.

The bottom line

The bull put spread is one of the most efficient income strategies available on NSE: you collect premium upfront, cap your downside with the long put, and let time decay do the work as long as the market holds above the short strike. It is the ideal trade for traders who have a neutral-to-bullish view, want defined risk, and prefer getting paid to wait rather than paying to participate.

Related strategies & terms

• Bull Call Spread — debit alternative for a more decisively bullish view.
• Bear Put Spread — the bearish mirror: buy higher put, sell lower put for a debit.
• Iron Condor — combine a bull put spread with a bear call spread for a range-bound income trade.
• Put Option · Defined Risk · Breakeven · Theta