Most helpful replyATO Certified Response
Author: BlakeATO(Community Support)Community Support ATO Certified Response17 Mar 2021
Hi @kazzamattaz
If you register for GST online, it will take effect immediately. It can take up to 48 hours to show on the ABN lookup, but your GST is active from the moment you register.
You can register through Online services for business or through your registered agent.
You can see how to register using online services for business under profile on our website.