Diagonal Spreads: Setup, Adjustments, and Real Examples

If you understand vertical spreads and calendar spreads individually, the diagonal spread is the natural next step. It combines elements of both — different strikes and different expirations — into a single position that gives you more flexibility than either one alone.

The most popular diagonal spread has a name you might already know: the Poor Man's Covered Call (PMCC). But diagonals come in several flavors, and understanding the full family opens up strategies for almost any market view.

What Is a Diagonal Spread?

A diagonal spread uses two options of the same type (both calls or both puts) with different strike prices AND different expiration dates.

• Buy a longer-dated option at one strike
• Sell a shorter-dated option at a different strike

That is what makes it "diagonal." On an options chain, the two legs sit at different rows (strikes) and different columns (expirations) — forming a diagonal line.

Compare that to:

• Vertical spread: Same expiration, different strikes
• Calendar spread: Same strike, different expirations
• Diagonal spread: Different strikes AND different expirations

The diagonal inherits characteristics from both parents. It has the time-decay differential of a calendar spread and the directional bias of a vertical spread.

The Call Diagonal (PMCC)

The most common diagonal spread is the call diagonal, better known as the Poor Man's Covered Call.

Here is how it works. Stock XYZ is trading at $100:

• Buy a deep ITM LEAPS call — the $80 strike expiring in 12 months — for $23.00
• Sell an OTM near-term call — the $105 strike expiring in 30 days — for $1.50

The LEAPS call acts as a stock substitute. It moves nearly dollar-for-dollar with the stock (high delta, usually 0.75-0.85) but costs a fraction of buying 100 shares. The short call generates income against it, just like a covered call generates income against stock.

Why use a PMCC instead of a traditional covered call?

Buying 100 shares of a $100 stock costs $10,000. The LEAPS call costs $2,300. That is 77% less capital for a similar income-generating position. For traders with smaller accounts or those who want to diversify across more positions, the capital efficiency is significant.

You can find LEAPS candidates and evaluate premium-selling conditions on Theta Command.

When to Use Diagonal Spreads

Diagonal spreads shine in several scenarios:

You want covered call economics with less capital. The PMCC gives you similar income potential to a covered call while tying up far less buying power. This is the most common use case.

You have a mild directional view plus a time view. A call diagonal is mildly bullish. A put diagonal is mildly bearish. In both cases, you also profit from the near-term option decaying faster than the long-term one.

You want to sell premium with a safety net. The long-dated option provides protection that a naked short option does not. Your risk is defined.

IV is moderate to low and you expect it to stay stable. Unlike calendar spreads (which benefit from IV expansion), diagonals are less sensitive to IV changes because the two legs are at different strikes. They tolerate a wider range of IV environments.

Setting Up a Call Diagonal (Step by Step)

1. Pick your stock. Look for liquid names with active options chains. Use the Lean Options screener to find candidates with strong scoring across all five pillars.

2. Buy the long leg. Choose a LEAPS call with at least 6-12 months to expiration. Target a delta of 0.75-0.85 — deep enough in the money to track the stock closely but not so deep that you overpay for intrinsic value. The 70-80 strike range on a $100 stock is typical.

3. Sell the short leg. Choose a near-term call with 25-40 days to expiration. Target a delta of 0.20-0.30 — out of the money enough that the stock has room to move without breaching your strike.

4. Check the cost basis. Your net debit is the LEAPS cost minus the short call premium. Make sure the debit is less than the width between your two strikes. If you buy the $80 call for $23.00 and sell the $105 call for $1.50, your debit is $21.50 and your strike width is $25. You have $3.50 of potential profit above your cost.

5. Size the position. Your max loss is the debit paid (if the stock drops to zero and both options expire worthless). Risk no more than 3-5% of your account.

Managing and Adjusting

The real power of diagonals is in the ongoing management. Unlike a single-trade strategy, a diagonal is designed to be managed over multiple cycles.

Rolling the Short Leg

This is the core management technique. When the short call approaches expiration:

• If OTM (ideal): Let it expire worthless or buy it back for pennies. Then sell a new short call at the same or different strike in the next monthly expiration. Collect more premium against your long leg.

• If near the money: Buy it back and sell a new call at a higher strike or further expiration. You may need to take a small loss on the roll but you preserve the long leg.

• If in the money: This requires the most attention. You can roll up and out (higher strike, further expiration) to avoid assignment. Or you can close the entire position if the stock has moved beyond your thesis.

When to Close

Close the entire diagonal when your LEAPS has less than 90 days to expiration (theta starts accelerating against your long leg), the stock has moved far from your thesis, or you have captured 30-50% of maximum potential profit. One safety rule: never sell the short leg at a strike below where you bought the long leg, or you convert the position into a bear call spread.

Risks

The stock crashes. Your LEAPS call can lose most of its value. The short call premium you collected provides a small cushion but will not save you from a 20% drop.

Early assignment on the short leg. If the short call goes in the money, the buyer may exercise. You would need to exercise your LEAPS to deliver shares, which collapses the trade. Monitor the short leg closely, especially near ex-dividend dates.

Theta catches up with your LEAPS. Once your long-dated option has less than 90 days left, it starts decaying rapidly. At that point, you are fighting theta on both sides. Either roll the LEAPS to a new expiration cycle or close the position.

The Bottom Line

Diagonal spreads — and the PMCC in particular — are one of the most capital-efficient income strategies available to retail traders. They let you participate in covered-call-style income generation without committing $10,000+ per position to buy shares.

The tradeoff is complexity. You need to actively manage the short leg, monitor your long leg's time value, and adjust when the stock moves. But for traders who enjoy active management and want to stretch their capital across more positions, diagonals are a powerful tool.

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For educational purposes only. Not investment advice. Options trading involves substantial risk and is not appropriate for all investors.