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Double Diagonal

A put diagonal and call diagonal combined to profit from time decay and range-bound price action.

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What is a Double Diagonal?

A double diagonal adds a put diagonal (for downside) to a call diagonal (for upside), creating a four-leg strategy that profits when the stock stays within a defined range while also benefiting from time decay and implied volatility differences across expirations. You sell both a near-term OTM call and a near-term OTM put, while buying longer-dated OTM calls and puts as protection on both sides. The structure resembles an iron condor — collect premium from both sides, profit if the stock stays in range — but with the key difference that the protective long options are further in time, not just further in strike. This means the long legs retain more value during adverse moves, providing better protection than a standard iron condor's wings while still generating income from the short options.

When to use it

Use a double diagonal in moderate-to-high IV environments when you expect the stock to remain range-bound for the near-term expiration while believing the longer-term outlook retains enough uncertainty to make the back-month options worthwhile. The double diagonal is particularly attractive when the implied volatility term structure is steep — when near-term IV is significantly higher than longer-dated IV. In this scenario, the short near-term options generate premium that is disproportionately high relative to the cost of the back-month protection. Like an iron condor, it is best applied to indices or highly liquid ETFs with mean-reverting tendencies.

Structure

Sell 1 near-term OTM call and sell 1 near-term OTM put (the income-generating legs), then buy 1 longer-dated OTM call at a higher strike and 1 longer-dated OTM put at a lower strike (the protection legs). The short options typically expire in 30–45 days while the long options expire 60–90+ days later. The net position is a debit if the long options cost more than the short options generate, or possibly a credit in steep term-structure environments.

Key Metrics

Max Profit
Variable — the maximum profit occurs when the stock is near either short strike at the front-month expiration, with the back-month options retaining significant time value. The profit is higher than a comparable iron condor in adverse scenarios because the long options hold more value, but the precise maximum depends on back-month implied volatility at the time of the short expiration.
Max Loss
Limited by the long options, but the maximum loss scenario is larger than in a standard iron condor where both wings are in the same expiration. If the stock gaps far beyond both long option strikes, the position can approach the full debit paid. In most real-world scenarios, the back-month options retain enough value to limit the loss to a manageable amount relative to the credit collected.
Breakeven
Two breakevens define the range where the trade is profitable at the front-month expiration. These cannot be precisely calculated at entry because the back-month options' residual value depends on future IV. The profitable range is typically wider than a comparable iron condor because the back-month long options retain more value when the stock is near the short strikes.
Greeks Profile
Theta is positive — the short near-term options decay faster than the back-month long options, generating net time decay income. Delta is near zero for a symmetric setup centered on the current stock price, but shifts if the stock moves. Vega is net positive because the back-month long options have higher vega than the short near-term options — a rise in the back-month IV increases the position's value. This positive vega is a key distinction from the iron condor's negative vega profile. Gamma is negative, meaning sharp moves in either direction hurt the position near expiration.

Tips & Best Practices

  • 1Monitor both the short and long legs as the front-month approaches expiration — roll the short legs before expiration to avoid gamma risk in the final week.
  • 2The long legs provide meaningfully better protection than standard condor wings during large adverse moves — this is the primary advantage over an iron condor.
  • 3Use when the IV term structure is steep: buy cheap back-month protection while selling expensive front-month premium.
  • 4Close or roll the double diagonal when either short option is breached — do not hold through expiration with an at-the-money short option.
  • 5After the front-month short options expire, evaluate the remaining back-month long options independently — they may still have value worth capturing or converting into a new position.
  • 6Double diagonals work well on indices (SPY, QQQ) where the term structure is more predictable and mean reversion tendencies are well-established.
  • 7Track the net vega carefully — unlike an iron condor that wants IV to fall, the double diagonal can tolerate (and even benefit from) a moderate IV increase in the back month.
  • 8The strategy requires active management and an understanding of options term structure — it is more complex than an iron condor and should be learned after mastering simpler spreads.

See it in action

Model a Double Diagonal with a real ticker. See the P&L chart, heatmap, and exact breakevens.

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