When buying a business, you can transfer a Business Name to your ABN yourself. To transfer/register a Business Name Online you need to visit the Government website, ASIC Connect. Have your ABN, Credit Card, and ASIC Transfer Number ready (the Seller should have provided you with the ASIC Transfer Number as part of Settlement).
Log into your existing ASIC Connect account (this is different to your Auskey Account). If you don’t already have an ASIC Connect account, go ahead and create one by clicking on [Sign up]. It’s free.
Once you’re logged into your ASIC Connect Account click on the tab [Licences & Registrations]. From the drop-down menu select [Business Name Registration]
Tick the check boxes shown and click [Get Started].
Select the ABN option that is applicable to yourself from the list provided and continue to follow the prompts from screen to screen.