Many people still do not know about their MSIC in GST submission. MSIC is Malaysia Standard Industry Classifications. This is similar to "Kod Perniagaan" in your corporation tax form.
GST Registrants require to specify their industry code upon their GST Registration. This code keeps in the profile of your GST Registration. You may find it by browsing your account details.
For the TAP online submission, GST user requires to fill in the blank of the MSIC code.
Please find the online serach engine on MSIC here. You can download the entire copy if you wish.