When applying for an ABN, you will be asked the question on the screenshot below.
You can check the box YES on the basis that by registering with www.mable.com.au and building a profile, you have:
1) “Advertised your business” and
2) “Registered with an Organisation” to provide services
If you say no, you will be sent to the following screen:
Information that further explains the ruling on your entitlement to have an ABN, taken from the Australian Taxation Office Website
In particular clause(s) 120 to 148 deal with “When is an enterprise being carried on?”NOTE: Should you have any concerns about lodging an ABN, we recommend you contact the Australian Business Register or your Tax Agent