It's your client’s responsibility to maintain their Australian business number (ABN) details.
They must update their details within 28 days of becoming aware of changes.
The fastest way to update your client's details is online using an AUSkey. You must be recorded against their ABN, which can be done via the tax agent portal.
All changes made to the ABN online will take effect immediately.
Note: The ABR Dashboard provides current information about ABR availability.
The following can't be updated:
Name changes made by the ATO and ASIC will update the ABR.
If you're unable to update your client's details using the above link, contact us or lodge a form by mail.