Diagonal Spread

What Is a Diagonal Spread?

A diagonal spread uses options with different strike prices and different expiration dates. This makes it a hybrid: it has directional exposure like a vertical spread and time decay mechanics like a calendar spread.

The typical structure: buy a longer-dated option further in-the-money, sell a shorter-dated option closer to at-the-money. The long leg acts as an anchor while the short leg generates income from theta decay. After the short leg expires, sell a new short option against the long leg and repeat.

Example structure (stock at $100, bullish view):

• Buy the 6-month $95 call for $9.00
• Sell the 30-day $105 call for $1.50
• Net debit: $7.50 ($750 per contract)
• Short leg expires, then sell another near-term call against the long leg
• Repeat until the long leg approaches expiration or the position is closed

Why It Matters for Options Traders

Diagonal spreads offer flexibility. Unlike a vertical spread with a fixed outcome at expiration, diagonals create a repeating structure: sell, expire, sell again. Each short leg sold reduces the cost basis of the long leg, potentially generating profit even if the underlying doesn’t move much.

The Poor Man’s Covered Call is the best-known diagonal variant. Instead of owning 100 shares, substitute a deep in-the-money LEAPS call. This dramatically reduces capital requirements while maintaining most of the income and directional exposure.

Diagonals also position well around events. Buy a longer-dated option with a strike near your price target, then sell shorter-dated options against it while waiting for your thesis to play out. The structure absorbs some of the time cost of being right on direction but wrong on timing.

Key Characteristics

• Structure: Long far-term option, short near-term option at different strikes
• Directional bias: Built into strike selection — typically bullish (call diagonal) or bearish (put diagonal)
• Theta: Net positive from short near-term leg; long leg decays more slowly
• Vega: Net long — benefits from IV increases, especially in the far-term leg
• Repeatability: Short leg can be re-sold after expiration, reducing long leg cost basis over time
• Capital efficiency: Deep ITM LEAPS provides leverage compared to stock ownership
• Key risk: Sharp move against position can cause short leg to exceed long leg’s intrinsic value, limiting adjustment options