If you're operating a registered company in Australia there are a number of rules, and that is one of them. Click for a link to a checklist of the other rules.
If you aren't up to speed on the rules you need to follow if you're operating a registered company, then there's a handy checklist you can download from ASIC.
For example, did you know a post office box can't be used as the registered office or "principal place of business"?
What do you have to tell ASIC? Do you have to register a business name? The checksheet gives some basic answers to some of these questions.