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Australian Business Register (ABR)

ABN registration for government
The Australian Business Register (ABR)'s Application for ABN registration for government organisations should be used by government organisations to apply for an ABN. Online registration is not available for government organisations.
Registration
If you’re in business you should get an Australian business number (ABN). You may also need to register for certain tax obligations and entitlements. We use registration to manage the tax and superannuation systems fairly for all businesses and their employees.
Update your details
If you change your address or authorised contact person, you must update your ABN details within 28 days. You can update your details quickly online using the ABR or the Business Portal.