Has your business changed address, structure, contact details, or ownership? If so, it’s important to update your ABN to ensure your information is accurate on the Australian Business Register (ABR). This is a legal requirement and helps government agencies and clients interact with you effectively.

In this guide, we’ll show you how to update your ABN online, what changes require notification, and how to stay compliant with ATO and ASIC requirements.

What Is an ABN?

An Australian Business Number (ABN) is a unique 11-digit identifier issued by the ATO to all registered businesses. It appears on invoices, tax documents, and government communications. Keeping your ABN details current helps ensure you’re receiving the correct information and that your business is operating lawfully.

When Should You Update Your ABN?

You must update your ABN within 28 days of any change to your business details. Common reasons include:

  • Change of business address
  • Change of contact details (phone/email)
  • Change in business activities or structure
  • Change of authorised contacts or public officer
  • Business no longer operating (ABN cancellation)

Keeping your ABN up to date also ensures you’re eligible for certain tax concessions, government grants, or stimulus payments.

How to Update ABN Details

You can update your ABN information online through the Australian Business Register (ABR) website at abr.gov.au. Here’s how:

  1. Visit the ABR website
  2. Log in using your myGovID and link your business using Relationship Authorisation Manager (RAM)
  3. Select the relevant ABN and update your business details
  4. Submit changes and receive confirmation

Note: If you don’t have access to your ABN, you may need to contact the ATO or your registered tax agent.

Can a Tax Agent Update Your ABN?

Yes. If you use a registered BAS or tax agent (like Taxopia), they can update your ABN details on your behalf. This is especially helpful for more complex changes—such as changes in business structure or deregistration.

ABN Changes vs ASIC Updates

It’s important to understand that ABN updates go through the ABR, but some business changes must also be reported to ASIC—especially if you’re a registered company.

  • ABN updates: Change of address, contact, business activity
  • ASIC updates: Company director details, shareholder changes, registered office

If you’re operating a company, you must keep both your ABN and ASIC records accurate.

Explore Taxopia’s company services for help managing ASIC compliance.

What If You No Longer Need an ABN?

If your business has closed or you’re no longer trading, you must cancel your ABN. You can do this online via the ABR. Failing to cancel an inactive ABN could lead to unnecessary correspondence or compliance actions.

Be sure to finalise any outstanding tax obligations before cancellation.

Other Business Registration Updates

Updating your ABN doesn’t automatically update your business name registration. If your business name or entity changes, you may also need to update records with ASIC.

Need to register or update your business name? Click here to register or renew a business name.

Final Thoughts: Keep Your ABN Accurate

Keeping your ABN details up to date is a small but critical part of business compliance in Australia. It ensures you’re accessible to clients and government agencies, helps avoid penalties, and keeps your operations running smoothly.

Need assistance? Taxopia offers expert support for ABN registration, GST, ASIC updates, and more. Get in touch today to keep your business on track.