Diagonal Spread

Options Spreads Advanced Singapore STI DBS OCBC UOB SINGTEL KEPPEL CAPLAND

Directional - Bullish (Call Diagonal) or Bearish (Put Diagonal)

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Quick Reference

Strategy Type Debit Spread (Directional + Time Decay Play)
Market Outlook Directional - Bullish (Call Diagonal) or Bearish (Put Diagonal)
Risk Profile Limited to net debit paid (typically)
Reward Profile Limited - Maximum when price reaches short strike at front month expiration
Time Horizon Front month: 20-45 DTE; Back month: 45-90 DTE
Iv Environment Low to moderate IV preferred; benefits from IV increase on back month
Breakeven Complex - depends on back month value at front month expiration

Payoff Profile

The diagonal spread creates an asymmetric payoff curve, with maximum profit when the underlying reaches the short strike at front month expiration. The curve is skewed in the direction of the trade bias. • At short strike when front month expires • Far away from both strikes (depends on direction) • Range around the short strike • Call diagonal = bullish; Put diagonal = bearish

Singapore Market Details

Primary Instruments STI Index Options, DBS Options, OCBC Options, UOB Options
Mas Compliance MAS regulated; retail trading permitted with licensed broker; defined risk strategy
Contract Size S$5 per point for STI; 1,000 shares for equities; 100 shares for ETFs
Trading Hours 9:00 AM - 5:00 PM SGT (Pre-Open 8:30 AM - 9:00 AM)
Expiry Options Monthly expiries available; diagonal spreads require different expiration months
Settlement T+2 for shares; T+1 for SGX derivatives
Tax Treatment No capital gains tax for individuals in Singapore
Stamp Duty 0.2% on share purchases (buyer and seller each); options exempt
Cdp Account Central Depository (CDP) account required for share ownership; not needed for options

Frequently Asked Questions

Should I use a call diagonal or put diagonal?

Use call diagonal when moderately bullish - expecting price to rise toward your target. Use put diagonal when moderately bearish - expecting price to fall toward your target. Match the diagonal type to your directional view.

What happens if price moves past my short strike?

If price exceeds your short strike significantly, your profit may be capped or start declining. Options: (1) Close entire position to capture profit, (2) Roll short option to higher/lower strike to continue participating, (3) Close short option only and hold long option.

Why does the back month option cost more than what I receive for the front month?

The back month option has more time value because it has longer until expiration. You're paying for that extra time value. The diagonal spread profits by having the front month decay faster than the back month, recovering your initial cost and more.

Can I lose more than the debit I paid?

For a standard diagonal spread, your maximum loss is typically the net debit paid. However, if price moves far enough beyond your short strike and you hold to back month expiration, losses can be larger. Active management prevents this scenario.

How is a diagonal spread different from a PMCC?

A PMCC (Poor Man's Covered Call) IS a specific type of call diagonal. The PMCC uses a very long-dated (LEAPS), deep ITM call as the long leg, typically with 70-80 delta. Regular call diagonals might use closer-dated and/or ATM long calls. PMCC specifically tries to simulate covered call writing.

When should I roll the short option vs close the entire position?

Roll when: Price is at or near short strike, thesis unchanged, and rolling provides credit or minimal cost. Close when: Thesis has changed, position is significantly profitable or at loss threshold, or you don't want to extend the trade. Key question: Would you enter this diagonal fresh?

How do I handle a diagonal spread through front month expiration?

You have three choices before expiration: (1) Close entire position - most common, safest approach, (2) Roll short option to next month - if you want to continue, (3) Let short expire, keep long - if short is worthless and you want the long position. Never hold through expiration without a plan.

What's the ideal delta for the long option in a diagonal?

For standard diagonals: 0.50-0.70 delta (ATM to slightly ITM) provides balanced exposure. For PMCC: 0.70-0.85 delta (deep ITM) mimics stock ownership. Lower delta (0.35-0.50) is cheaper but less directional. Choose based on how much directional exposure you want and budget.

How does earnings affect my diagonal spread?

Critical consideration: If earnings falls BETWEEN your expirations, IV dynamics become unpredictable. If front month expires BEFORE earnings and back month includes earnings, you may benefit from IV expansion. If front month includes earnings, beware of IV crush and large moves.

My diagonal is profitable. Should I take profits or try for more?

At 25-50% of max profit, seriously consider closing. Diagonals rarely achieve theoretical max profit. Factors favoring taking profits: significant profit achieved, approaching front month expiration, IV has expanded, or thesis confidence declining. Remember: a profit in hand is real.

How do I optimize diagonal entries using term structure analysis?

Analyze: (1) Term structure slope - steeper contango favors diagonals, (2) Compare front vs back month IV - you want to sell elevated front IV or buy cheap back IV, (3) Monitor for term structure shifts during the trade, (4) Consider events that might distort term structure. Enter when multiple factors align favorably.

When should I use a double diagonal vs a single diagonal?

Double diagonal (call diagonal + put diagonal) when: expecting range-bound but uncertain of direction, want wider profit zone, comfortable managing multiple legs. Single diagonal when: have clear directional view, want simpler management, capital constraints. Double diagonals have more moving parts but offer flexibility.

How do I hedge the delta risk in a diagonal spread?

Options: (1) Trade the underlying to neutralize delta, (2) Add another option position to offset delta, (3) Adjust short strike selection to modify delta exposure, (4) Use a second diagonal on the opposite side (creating double diagonal). For most retail traders, simply adjusting position size or accepting the delta exposure is more practical than active hedging.

What's the optimal strike width for diagonal spreads?

Depends on expected move magnitude: 3-5% expected move = narrow width (50-75 points), 5-8% expected move = medium width (75-125 points), 8%+ expected move = wide width (125-200 points). Wider widths offer higher max profit but require larger moves. Match width to your price target and conviction level.

How do I manage a diagonal when IV term structure inverts?

Inversion hurts diagonals - front month IV higher than back means you're selling cheap and buying expensive (relatively). Options: (1) Close if loss is acceptable, (2) Hold if you believe inversion is temporary, (3) Convert to vertical spread by rolling to same expiration (locks in current value), (4) Add positions that benefit from inversion. Prevention: check term structure before entry.

Related Strategies

Calendar Spread
Vertical Spread
PMCC (Poor Man's Covered Call)

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