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How to add or update your ABN online

It’s simple to add or update your Australian Business Number in Online Banking.

Step by step guides

Sole traders

Check which app you have:

New Westpac App

  1. Tap Profile > Settings > Contact Details 
  2. Scroll down to Australian Business Number (ABN) 
  3. Tap Add ABN, type your ABN
  4. Tap Search then Confirm.


Classic Westpac App

  1. In the menu bar, tap Services & Security
  2. Under Profile Settings, select Update contact details
  3. Scroll down to Australian Business Number (ABN) 
  4. Type your ABN and tap Search
  5. Tap Confirm.

If we cannot verify your ABN, please call us on 132 142 or visit a Westpac branch.

Business Networks

You need to be an Administrator to update your company’s ABN

  1. Sign in to Online Banking from a desktop
  2. Go to Administration and select Business settings 
  3. In the Registered business details section, select Edit/Add in the ABN line 
  4. Check your company’s ABN
  5. Select Confirm.

We reference ASIC data to find your ABN. Your ABN needs to be updated with ASIC before you can add or edit your ABN in Online Banking. If you’ve already contacted ASIC and we still cannot verify your ABN online, please call us on 132 142 or visit a Westpac branch.

What other details can I update online?

What if you have more than one Approver for administration tasks?

If your business network only needs one Administrator to approve admin tasks, your ABN will now be active. If your Online Banking is set up for more than one approver, the additional Approvers will need to: 

  1. Sign in to Online Banking from a desktop 
  2. Click on the Approval button (near the Sign Out button)
  3. Select Administration to see the email address pending approval.

Will the ABN be applied to my online invoicing?

If you use our Biz Invoice online invoicing tool, the ABN you have added or edited is the one that will appear on the invoices linked to your account in Online Banking. It is important that you check and verify that the ABN you have provided is correct.