Ratio Diagonal Spread
A diagonal spread with unequal contracts — different strikes AND different expirations with a ratio twist. Combines directional and time decay elements.
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What is a Ratio Diagonal Spread?
A ratio diagonal spread combines two key modifications to a basic spread: different expirations (diagonal) and unequal contracts (ratio). You buy one longer-term option at one strike and sell multiple shorter-term options at a different strike. It is a diagonal spread with an extra short option.
The trade profits from two forces: time decay on the short-term options and directional movement toward the short strike. The extra short option boosts the income but introduces additional risk if the stock moves too far past the short strike.
Think of it as a poor man's covered call (or put) with an extra short option. More income, more risk, same core concept.
How to Set It Up
- Buy 1 longer-term option at strike A (back month)
- Sell 2 shorter-term options at strike B (front month)
- Different strikes, different expirations
- For bullish: Buy a back-month call at a lower strike, sell 2 front-month calls at a higher strike.
- For bearish: Buy a back-month put at a higher strike, sell 2 front-month puts at a lower strike.
- Ratio: Commonly 1:2.
- Front-month expiration: 20-45 days.
- Back-month expiration: 60-120 days.
- Net cost: Depends on strikes and ratio. Often a debit on the long side, partially offset by the extra short premium.
The position combines directional delta from the diagonal structure with extra income (and risk) from the ratio.
When to Use This Strategy
Use a ratio diagonal spread when:
- You have a mild directional bias and want to profit from time decay simultaneously
- You want more income than a standard diagonal offers
- Front-month IV is elevated relative to back-month IV
- You are comfortable managing naked option risk
- You have a specific target price for the front-month expiration
This is an advanced strategy that requires experience with both diagonals and ratios. The interaction between time decay, directional movement, and the extra naked option creates a complex P&L curve.
Example Trade (Bullish Version)
Stock XYZ is trading at $100. You expect it to drift toward $105 over the next month.
- Buy 1 XYZ $95 call (90 days out) for $8.00 (deep ITM, acts like stock)
- Sell 2 XYZ $105 calls (30 days out) for $2.00 each ($4.00 total)
- Net debit: $8.00 - $4.00 = $4.00 ($400 total)
At front-month expiration, if XYZ is at $105: Both short $105 calls expire worthless. The long $95 call (60 days remaining) is worth approximately $12-13. Total value: $1,200 - $400 = $800+ profit. Excellent.
If XYZ stays at $100: Both short calls expire worthless. Long call worth approximately $8-9. Net: $850 - $400 = $450 profit. The extra short call added free premium.
If XYZ rallies to $115: Short calls cost $10 each ($2,000). Long call worth approximately $21 ($2,100). Net: $2,100 - $2,000 - $400 = -$300 loss. The ratio hurt you.
If XYZ drops to $90: Short calls worthless. Long call worth approximately $2-3. Net: $250 - $400 = -$150 loss. Manageable.
Risk and Reward
- Max profit: Varies based on where the stock is at front-month expiration and the remaining value of the back-month option. Best case is stock at the short strike.
- Max loss: On the upside (for call version), the extra naked short call creates potentially significant losses. On the downside, the loss is limited to the net debit.
- Breakeven: Complex and changes over time as the back-month option's value fluctuates.
The curved P&L diagram makes this hard to quantify with simple formulas. Use an options calculator for precise numbers.
Tips and Common Mistakes
- The back-month option is your anchor. Make sure it is deep enough ITM (or has enough delta) to offset the front-month shorts if the stock moves.
- Close the shorts at front-month expiration. If the stock is near the short strike, close the shorts and keep the back-month long. Then sell new shorts for the next cycle.
- Do not let the ratio get too aggressive. 1:2 is the sweet spot. 1:3 creates too much naked risk.
- IV differential matters. The trade works best when front-month IV is higher than back-month. This makes your short options "overpriced."
- Manage actively. This is not a set-and-forget trade. Check the position daily and adjust if the stock moves significantly.
Related Strategies
- Call Diagonal Spread — the standard 1:1 diagonal
- Ratio Calendar — same strike with unequal contracts
- Poor Man's Covered Call — the base concept (LEAPS + short call)
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