Calendar Spread

What will happen to my calendar spread on expiry day?

If you hold a calendar spread that includes an expiring contract, you will lose the margin benefit on the expiry day and must maintain a full margin for the remaining contract.

Example: You have a Nifty February Call option(expiring today) and Nifty March Put Option position → So on the day of expiry for both the February and March contracts you will require a full margin to hold both the positions.