If we are not eligible to register with SST but previously is GST resgitered, can my tax invoice format still as per previous format?
Yes you can but just use the wording “Invoice” will do.
How about the GST ID? still need to show in the invoice? or just cancelled it out?
You can cancel or strike it out and replace it with a rubber stamp with your SST Registration Number.
Focus on info & knowledge on GST - See guide