Diagonal Spread (Options): Combining Time and Price Into One Trade
A diagonal spread is an options strategy that combines a calendar spread and a vertical spread by buying and selling options on the same underlying with both different strike prices and different expiry dates, allowing a trader to profit from time decay and a directional move at the same time.
Not financial advice. All figures for educational reference only. Data as at October 2026.
Last updated: October 2026
Key Takeaways
- A diagonal spread uses two options of the same type (both calls or both puts) with different strikes AND different expiries — unlike a vertical spread (same expiry, different strikes) or a calendar spread (same strike, different expiries).
- A common version sells a near-dated option and buys a longer-dated option at a different (often further out-of-the-money) strike, collecting time decay on the short leg while retaining longer-term directional exposure on the long leg.
- Diagonal spreads are flexible: by choosing how far apart the strikes and expiries are, a trader can lean the position more toward a directional bet or more toward a time-decay (theta) bet.
- Risk is generally limited to the net premium paid, though the position’s value can still fluctuate meaningfully before the near-dated leg expires.
- Because it involves two different expiries, a diagonal spread requires active management — the trader typically must decide whether to close, roll, or let the near-term leg expire and adjust the position.
What Is Diagonal Spread (Options)?
A diagonal spread sits between two simpler strategies: the calendar spread (same strike, two expiries) and the vertical spread (same expiry, two strikes). By varying both the strike and the expiry, a diagonal spread lets a trader express a view that combines a price target with a time horizon — for example, “I expect this stock to grind higher over the next two months, and I want to collect some income along the way by selling shorter-dated calls against a longer-dated call I own.”
A classic long diagonal call spread involves buying a longer-dated call at a strike closer to the current price (giving more intrinsic/time value and a higher probability of being in the money), and selling a shorter-dated call at a higher strike (collecting premium that decays faster due to its nearer expiry). As the short-dated leg approaches its expiry, the trader can let it expire, buy it back, or roll it out to a new expiry, repeating the process — a technique sometimes called a “poor man’s covered call” when the long leg is a deep in-the-money, far-dated call used as a stock substitute.
Diagonal spreads are more complex than single-leg or same-expiry multi-leg strategies because the two legs decay at different rates and respond differently to changes in implied volatility — a nuance known as “volatility skew” across expiries. This makes diagonal spreads a strategy generally suited to traders who already understand basic vertical spreads and calendar spreads.
How Does It Work in Singapore?
Diagonal spreads are almost always built on US-listed underlyings by Singapore retail traders, both because of SGX’s thin options liquidity and because the strategy depends on having multiple expiry dates with reasonable open interest at various strikes — a depth of market that is far more common on liquid US names and index ETFs than on SGX-listed stocks.
Brokers popular with Singapore investors for this kind of multi-leg, multi-expiry trading include Interactive Brokers, Tiger Brokers, and moomoo, all of which support the combo order tickets needed to enter a diagonal spread as a single transaction rather than two separate legs (which would expose the trader to execution risk on each leg individually). Since the position typically needs to be actively managed as the near-dated leg approaches expiry, Singapore-based traders running this strategy on US options should also be mindful of US market hours (typically 9:30pm–4am SGT, depending on daylight saving), since key management decisions often need to happen close to the near-leg’s expiry.
| Strategy | Strikes | Expiries |
|---|---|---|
| Vertical spread | Different | Same |
| Calendar spread | Same | Different |
| Diagonal spread | Different | Different |
Source: Standard options strategy classification.
Diagonal Spread (Options) Example
A Singapore trader is moderately bullish on a US stock trading at USD 100 and wants to collect some income while waiting for a longer-term move. They set up a long diagonal call spread:
Buy 1 call, strike USD 95, expiring in 3 months, for USD 9.00 (more time value, closer to the money).
Sell 1 call, strike USD 105, expiring in 1 month, for USD 2.00 (less time value, further out of the money).
Net cost: USD 9.00 − USD 2.00 = USD 7.00 per share, or USD 700 per contract. At SGD/USD 1.34, that is roughly SGD 938.
If, after one month, the stock is trading at USD 102, the short call (strike USD 105) expires worthless, and the trader keeps the full USD 200 premium collected. The long call (strike USD 95, 2 months remaining) is now worth more than when purchased, since the stock has moved in the trader’s favour and time has passed. The trader can then choose to sell another near-dated call against the long position, repeating the income-generating cycle, or close the whole position for a profit if satisfied with the gain so far.
Advantages
Combines income generation with a directional view. Selling the near-dated leg collects premium that can offset the cost of the longer-dated leg, while the longer-dated leg still benefits from a favourable price move.
Lower capital outlay than buying a long-dated call outright. The premium collected from the short-dated leg partially funds the purchase of the long-dated leg, reducing net cost compared to holding the long call alone.
Flexible and repeatable. After the near-dated leg expires or is closed, a trader can sell another short-dated option against the remaining long position, similar to running a covered call repeatedly, without owning the full underlying.
Benefits from faster time decay on the short leg. Because the short leg has less time to expiry, it loses time value faster than the long leg, which structurally favours the position if the underlying doesn’t move sharply against it.
Risks and Limitations
More complex to manage than single-expiry strategies. The two legs decay and respond to volatility changes differently, requiring the trader to actively monitor and potentially adjust the position as the near-dated leg approaches expiry.
Early assignment risk on the short leg. If the short-dated call goes deep in-the-money, particularly near a dividend date on a US stock, the counterparty may exercise it early, forcing the trader to either deliver shares they don’t own or close the position unexpectedly.
Volatility skew risk. Diagonal spreads are sensitive to how implied volatility differs between the two expiry dates; an unfavourable shift in this relationship can reduce the position’s value even if the underlying price doesn’t move much.
Can still lose the full net premium. If the underlying falls sharply and stays well below both strikes, both legs can lose most of their value, and the position can approach a full loss of the net premium paid.
Requires ongoing decisions. Unlike a buy-and-forget options trade, a diagonal spread typically needs the trader to decide, at each near-leg expiry, whether to roll, close, or let the position run — a discipline that not all investors are suited to.
The Bottom Line
For Singapore investors ready to move beyond single-leg options, a diagonal spread offers a way to blend a directional view with ongoing income generation, but it demands more active management than simpler strategies and should be approached only after mastering vertical and calendar spreads first.