Bear Put Spread: Defined-Risk Bearish Options Strategy

A bear put spread buys a put at one strike and sells a put at a lower strike, in the same expiry. It is the bearish mirror of a bull call spread: a capped loss, a capped gain, and a cheaper position than buying a put outright.

The structure

Leg	Action	Strike	Effect
1	Buy 1 put (PE)	Higher	Gives you the downside exposure
2	Sell 1 put (PE)	Lower, same expiry	Pays for part of leg 1, caps the gain

Note the direction: for puts, the higher strike is the more valuable one, so the bought leg sits above the sold leg. This is the mirror of a call spread and the ordering trips people up regularly.

The arithmetic

Let D be the net debit paid and W the width between the strikes.

Quantity	Formula
Max loss	D — the debit paid
Max profit	W − D
Breakeven	Higher strike − D
Profit reached when	Index at or below the lower strike at expiry
Loss reached when	Index at or above the higher strike at expiry

A worked example

Illustrative figures, not current prices.

The index is at 24,000. You buy the 24,000 put for 85 and sell the 23,800 put for 32. Net debit is 53, width is 200.

Index at expiry	Long put worth	Short put worth	Result
24,200 or above	0	0	−53 — maximum loss
24,000	0	0	−53
23,947	53	0	0 — breakeven
23,900	100	0	+47
23,800	200	0	+147 — maximum profit
23,400	600	−400	+147 — capped

As with the call version, the final row shows the cap doing its work. A 600-point fall produces the same result as a 200-point fall, because everything below the sold strike belongs to the put you sold.

Why not just buy the put?

	Plain long put	Bear put spread
Cost	Higher	Lower
Max loss	The premium paid	The debit paid
Max profit	Large — down to zero in theory	Capped at W − D
Breakeven	Strike − premium	Higher strike − debit, which is nearer
Theta exposure	Full	Reduced
Vega exposure	Long	Reduced

There is one asymmetry worth knowing against the call version. Implied volatility typically rises when markets fall, which helps a long put through vega. A bear put spread reduces that benefit along with the rest of the vega exposure.

The one real difference from a call spread

In other words, the spread costs you some of the volatility tailwind that makes long puts attractive in a sharp sell-off. Skew and the behaviour of IV in falling markets covers why that tailwind exists.

Choosing the strikes

The same two decisions as a call spread, in the other direction.

The bought strike decides how far the index must fall before the position works. At the money costs most and starts working soonest.

The width decides the maximum profit. Place the sold strike at or slightly above the level you genuinely expect the index to reach — capping below a level you do not expect to see costs nothing real.

When a bear put spread fits

You expect a decline of roughly known size. Capping at your expected level is free in practice.
You want a defined cost. The debit is the entire risk, known at entry.
You want a nearer breakeven than a plain put offers.
You want downside exposure without the margin a short call position requires.

When it fits badly

You expect a sharp, large fall. The cap and the reduced vega both work against you in exactly that scenario.
Liquidity at the lower strike is thin. Two legs means two spreads crossed each way.
You want protection rather than a position. Hedging an existing holding is a different problem with different answers.

Automating it

Create two legs

Buy one put and sell one put, same expiry, with the sold strike below the bought one.

Set strike rules, not numbers

An at-the-money rule for the bought leg and a fixed offset below for the sold leg keeps the width consistent.

Set entry and exit times

An exit before the close keeps it intraday.

Set the square-off-all-legs rule

A spread missing its bought leg is a naked short put, which is the case worth protecting against.

Decide on a stop loss

The loss is capped at the debit already. A stop loss exits sooner at the cost of closing positions that might have recovered.

Testing it

How often did the index finish at or below the sold strike, reaching maximum profit?
How often did it finish above the bought strike, costing the full debit?
Does the sample contain a genuine sell-off, not just drifting markets?
Is the result carried by one or two large moves, or spread across many trades?
After costs on four legs per round trip, is expectancy still positive?

The third item is the one to insist on. Bearish strategies tested only in rising or flat markets produce a uniformly poor result that says nothing about whether the structure works when it is supposed to. Choosing a test period covers what a representative sample looks like.

The short version

Buy a put, sell a lower one, same expiry — net debit
The bought leg is always the one closer to the money
Max loss is the debit; max profit is the width minus the debit
Breakeven is the bought strike minus the debit
The spread reduces the volatility tailwind a plain long put enjoys in a sell-off
A spread missing its bought leg is a naked short put — set the square-off rule

For a bullish view, the bull call spread works identically with calls.

Frequently asked questions

Buying a put at one strike and selling a put at a lower strike in the same expiry. It is a bearish position with a capped loss and a capped gain.

The higher strike. For puts the higher strike is the more valuable one, so the bought leg sits above the sold leg — the mirror of a call spread.

The net debit paid to open the position, known exactly at entry.

The bought strike minus the net debit.

A plain put keeps more of the downside and benefits more from rising volatility in a sell-off, but costs more and has a further breakeven. The spread trades some of that for a cheaper position.

Partly. Implied volatility typically rises when markets fall, which helps a long put through vega. The sold leg offsets some of that benefit along with the rest of the vega exposure.

You are holding a naked short put with substantial downside exposure, which is the serious assembly failure for this structure. The square-off-all-legs rule is what prevents it persisting.

Hedging an existing holding is a different problem with different answers. A bear put spread is a position taken for its own sake, with a capped payoff that may not match the exposure you are trying to offset.

Place the sold strike at or slightly above the level you genuinely expect the index to reach. Capping below a level you do not expect to see costs nothing real and makes the position cheaper.

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