A diagonal spread uses different expirations and different strikes. A common bullish diagonal buys a longer-dated call and sells a shorter-dated higher-strike call. It is part directional trade, part income trade.
Think of it as a covered call substitute using an option instead of stock as the long side.
Bullish diagonal risk sketch
The long-dated call anchors exposure while the short call caps near-term upside.
Example shown as a simplified same-expiration payoff shape.
Actual diagonal value changes with time and volatility.
When it fits
Use a diagonal when you want longer-term exposure but also want to sell short-term premium against it. It fits slow bullish or slow bearish views better than explosive move expectations.
Choosing the long option
The long option should have enough time and enough responsiveness to act like the anchor. Traders often choose an in-the-money long option so it behaves more like stock and less like a lottery ticket.
Managing the short option
The short option is the active leg. If the stock approaches the short strike, decide whether to buy it back, roll it, or close the full spread. Never forget that the short option can cap the exact move you wanted.
Execution playbook
Use this section to turn the setup into a broker-screen plan: selection, follow-up action, risk limits, and reasons to skip the trade.
Key execution ideas
- Diagonalizing a spread changes both strike and expiration.
- A diagonal bull spread can act like a stock substitute with income.
- Diagonal backspreads add movement exposure to a time-spread structure.
Before entering the order
- Choose a long option with enough time to be the anchor.
- Sell a shorter-dated option at the target or income strike.
- Check whether the short strike would cap the move you actually want.
Follow-up action
- Buy back or roll the short option when the stock approaches the short strike.
- Close the long option if the original directional thesis fails.
- Do not keep selling calls against a long option that no longer has enough delta.
Skip the trade when
- You expect an immediate explosive move.
- The long option has poor liquidity or too little time.
- The short premium is too small to justify capping the trade.
Options can lose money quickly. Treat every setup as a defined plan: entry, maximum loss, adjustment trigger, exit target, and a reason to skip the trade when pricing is not favorable.