The total amount of funds that you can use to trade for a particular day is known as available margin. 

The definition of used margin, on the other hand, involves different trading scenarios. Here are the key ones. 

  • The amount that’s blocked for your unexecuted open orders.
  • The net funds used for your executed equity intraday, F&O intraday/positional trading and delivery orders. 
  • The amount will be shown in the used margin whenever you sell your shares or have open F&O positions.

The used margin will be credited to the available margin, once you square off your positions.