Short calendar
Buy the near call and sell the later one: profit from a large move before the near expiry.
Big move2 legsCredit
Illustrative: underlying at 100, strikes every 2.5, front expiry 45 days, later legs 75 days, implied volatility 25%, model prices. One lot = 100 shares.
Key figures
| Opens for | a credit of $120 |
|---|---|
| Max profit | +$120 |
| Max loss | −$184 |
| Break-evens | 95.51 and 105.79 |
| Position delta today | −1 share |
| Outlook | Big move |
The legs
| Action | Quantity | Option | Model price |
|---|---|---|---|
| Buy | 1 | 100 call, 45 days | 3.77 |
| Sell | 1 | 100 call, 75 days | 4.97 |
How it works
Buy the near call and sell the later one: profit from a large move before the near expiry. Time spreads use options with different expiry dates. The near option loses value faster, and the payoff is read at the near (front) expiry while the later option still has time left.
When it fits
It suits a view that the underlying moves a long way, in either direction or the direction the structure leans to, before expiry.
What can go wrong
The most it can lose at expiry in this example is −$184. Short options can be assigned early, and a sharp fall with implied volatility rising can hurt more than the expiry line suggests, which is what the crash band shows. Because a later option is still open at the front expiry, the result there depends on implied volatility at that time, not only on the price.
Building it in Trident
In the Strategy Lab, choose short calendar and the days to expiry. Trident applies these strike rules to your live chain, prices each leg and draws the trade on the risk graph, where you can drag the days to expiry, change implied volatility or switch on the crash band. When it looks right, send it to order management; nothing reaches your broker until you send it.
Frequently asked questions
What is a short calendar?
Buy the near call and sell the later one: profit from a large move before the near expiry.
What is the maximum loss on a short calendar?
In this illustrative example it is −$184 for one lot at expiry.
Where does a short calendar break even?
With the underlying at 100 in this illustrative example, the break-even at expiry is 95.51 and 105.79.
Can I build a short calendar in Trident?
Yes. Pick it in the Strategy Lab and Trident chooses the strikes from your live chain, prices the legs and draws it on the risk graph.
Illustrative example with model prices, not a recommendation. Options carry risk of loss. See the risk disclosure.