Put Diagonal Spread Options Strategy Guide
By OptionClaws, VirWare LLC · Updated 2026-08-23
A put diagonal spread buys a put with more time and a higher strike, and sells a put with less time and a lower strike, for a net debit. The long put provides bearish exposure for months; the short put, resold each cycle, lowers the cost. The position pays best if the stock drifts down to the short strike by the front expiration and loses if the stock rallies and both puts decay. It is the bearish counterpart of the poor man's covered call, and a way to hold longer-dated downside exposure while collecting premium against it.
Key takeaways
- Buy a longer-dated put at a higher strike and sell a shorter-dated put at a lower strike
- A bearish debit trade: best result is the stock at the short strike at the front expiration
- Max loss is the net debit; keep the strike width greater than the debit
- The mirror image of the poor man's covered call, built for a decline
When it makes sense
- You expect a gradual decline over weeks to months, rather than a crash
- You want bearish exposure with a defined loss and income from near-term puts against it
- Front-month put implied volatility is elevated relative to the back month
- You want a position that can be rolled month after month as the decline plays out
How it works
Buy one put 60 to 120 days out at or near the money (or in the money for a higher-delta, stock-like hedge) and sell one put 20 to 45 days out at a lower strike. The net debit is the maximum loss. At the front expiration, if the stock is at the short strike the short put expires worthless and the long put is in the money with time value left, the best case. If the stock rallies, both puts lose value and the spread shrinks toward zero. If the stock crashes through the short strike, both puts go deep in the money and the spread converges toward the strike width, which is still a gain as long as the width exceeds the debit, but a smaller one than at the peak. Keep width greater than debit.
Risk and reward
Maximum loss: the net debit, on a rally that leaves both puts worthless. Maximum profit at the front expiration: roughly the width minus the debit plus the long put's remaining time value, with the stock at the short strike. A crash does not hurt, it simply caps the gain near the width minus the debit rather than letting it reach the peak. Compared with a put debit spread in a single expiration, the diagonal costs a little more for the extra time on the long leg, gains the ability to resell the short put, and keeps the long put alive after the first cycle.
Greeks and volatility
Net delta is negative, roughly the long put's delta minus the short put's. Theta is positive when the short put decays faster than the long, which it does while the stock is above the short strike. Vega is positive net, long the back month, and since put implied volatility rises on declines, a moderate sell-off helps through both price and volatility. Gamma is negative near the short strike into the front expiration.
Managing the trade
At the front expiration, if the short put expires worthless sell another one at the next strike and date you like; if the stock is near the short strike, close it or roll it down and out. Early assignment on the short put is possible once it is deep in the money with little time value; you would be long 100 shares against the long put at a higher strike, a hedged position you can unwind by exercising the long put. Close or roll the long put with 30 to 45 days left, before its decay steepens. An earnings date between the expirations belongs to the long put only.
Worked example
Stock at $100. Buy the 90-day $100 put for $5.20 and sell the 30-day $92 put for $1.10, a net debit of $4.10 ($410). The $8 width exceeds the debit. At the front expiration with the stock at $92, the short put expires worthless and the long put is worth about $10.20 ($8.00 intrinsic plus time value): the spread sells for $1,020, a $610 profit. With the stock at $106 the long put is worth about $1.80, a $230 loss. With the stock at $80, both puts are deep in the money and the spread is worth close to $8.00 plus a little time value, roughly a $400 gain rather than the peak.
What to screen for
Screen put diagonals by net debit, the width-versus-debit rule, the front-minus-back implied volatility gap, the short put's distance below the stock in ATRs, and return on the debit per cycle. Exclude earnings inside the short put's window if you do not want the event, and check back-month liquidity at the long strike.
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Frequently asked questions
- Is a put diagonal spread bullish or bearish?
- Bearish. It profits from a decline to the short strike by the front expiration and loses if the stock rallies. It is not a substitute for a put credit spread, which is a bullish trade.
- What is the maximum loss on a put diagonal?
- The net debit, reached if the stock rallies enough that both puts expire worthless. The loss shrinks by any premium collected from reselling the short put.
- What happens if the stock crashes?
- Both puts go deep in the money and the spread converges toward the strike width. As long as the width exceeds the debit that is still a profit, just smaller than the peak at the short strike.
- Put diagonal or bear put spread?
- The bear put spread is a single-expiration trade with a fixed payoff. The diagonal costs slightly more, lets you resell the short put each cycle, and keeps the long put alive after the first expiration, which suits a slower decline.
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Last updated 2026-08-23. Educational content, not investment advice. Options involve substantial risk and are not suitable for every investor. See our Terms of Service.