Trade at Close (TAC) is a ten minutes trading phase commencing immediately after the closing routine. The TAC session will occur at 5.06pm to 5.16pm on a regular trading day and from 12.06pm to 12.16pm if the market is trading for half a day.

Key highlights:

1. Orders are matched continuously only at the fixed equilibrium price (also known closing auction price) established from the preceding closing auction. 

2. TAC is available for a security on a trading day only if the closing auction for that security on that day resulted in a closing auction price; correspondingly, TAC will not be available for a security if there is no closing auction price on that day.

3. Unmatched limit orders from the closing routine will be carried forward to the TAC phase and will expire (with the exception of the long-dated orders) at the end of the TAC phase.

4. CAP value will appear under the CAP column in your Watchlist, Top Movers and Prices page. It will only be displayed during TAC session.

Your order will be rejected with the following message if you have entered an invalid price during TAC session.

Example 1
Order entered with a limit price not equal to closing auction price.
Rejection reason: "Premium doesn’t match fixed price"

Example 2
Order entered with a limit price when there is no closing auction price.
Rejection reason: "No fixed price available in fixed price matching session"