Bear Put Spread options strategy

What is a bear put spread?

A bear put spread is a vertical spread built by buying a put at a higher strike and selling a put at a lower strike, both with the same expiration. The higher-strike put costs more than the lower-strike put, so the position opens for a net debit, and that debit is the maximum loss. The short put lowers the cost of the trade but also sets a floor on how much the position can gain: profit stops growing once the underlying falls to the lower strike.

It is also called a debit put spread or long put vertical. The strategy expresses a moderately bearish view with a fixed, known risk and reward.

When to use it and the market view

Consider a bear put spread when you expect the underlying to decline by a measured amount rather than collapse. If a stock near $210 looks likely to drift toward $200, buying a put alone pays for downside potential below $200 that you may not expect. Selling the 200 put gives up that extra potential and uses the premium to reduce cost and move breakeven closer to the current price.

The spread also works as a defined-risk hedge. A portfolio holder who wants protection against a moderate pullback can buy a put spread for less than an outright put, accepting that protection stops below the lower strike. Because it has less net volatility exposure than a single long put, it is less sensitive to high implied volatility going in and to a volatility drop after an event.

Payoff, formulas, and a 200 strike example

Let K2 be the higher (long) put strike, K1 the lower (short) put strike, S the expiration price, and D the net debit.

Profit = max(K2 − S, 0) − max(K1 − S, 0) − D

Breakeven = K2 − D · Maximum profit = (K2 − K1) − D · Maximum loss = D

Suppose you buy the 210 put for $8 and sell the 200 put for $4, a net debit of $4 per share ($400 per contract). At expiration:

• S = 215: both puts expire worthless. Profit = −$4, the maximum loss.
• S = 206: the long put is worth 4. Profit = 4 − 0 − 4 = $0, the breakeven.
• S = 203: profit = 7 − 0 − 4 = +$3 per share ($300 per contract).
• S = 195: profit = 15 − 5 − 4 = +$6 per share ($600 per contract), the maximum.

Below 200, the short put gains intrinsic value dollar for dollar with the long put, so the payoff line goes flat. The trade risks $400 to make up to $600.

Maximum profit, loss, and breakeven

Measure	Formula	210/200 spread, $4 debit
Maximum profit	(K2 − K1) − debit	$6 per share ($600 per contract) at or below 200
Maximum loss	Net debit	$4 per share ($400 per contract) at or above 210
Breakeven at expiration	K2 − debit	$206

Before expiration, the spread typically trades below its maximum value even if the underlying is below 200, because the short put retains some time value.

Greeks and implied volatility impact

The spread carries negative delta, smaller than a lone long put because the short put offsets part of it. Its gamma is positive near the long strike and negative near the short strike. Theta generally hurts when the underlying is near or above the long strike and can help when it has fallen toward or below the short strike, where the short put's time value decays in your favor.

Net vega is modest because one option is bought and one is sold. When the spread is out of the money, rising implied volatility slightly helps; when it is deep in the money, rising IV slightly hurts. Put skew often makes lower-strike puts relatively expensive, which can improve the credit received for the short leg and lower the net cost of the spread.

Risks to manage

If the underlying does not fall, or falls too slowly, the spread can lose the full debit. An in-the-money short put may be assigned early, leaving you with long shares that your long put still protects, though margin and capital requirements may change. Two legs mean two bid-ask spreads, so use limit orders and check liquidity. Prices finishing near the short strike at expiration create pin risk, which many traders avoid by closing the spread in the final days.