How to Check My ABN: A Simple Guide for Businesses and Sole Traders

If you run a business or operate as a sole trader in Australia, having an active Australian Business Number (ABN) is essential for tax purposes, invoicing, and business transactions. Whether you need to check if your ABN is active, verify a supplier’s ABN, or retrieve your details, here’s how you can do it quickly and easily.

Why You Should Check Your ABN

Before we dive into how to check an ABN, here’s why it’s important:

✅ Ensure your ABN is active – An inactive ABN can impact your business operations.
✅ Verify suppliers or contractors – Avoid issues with invalid ABNs on invoices.
✅ Keep your details updated – Make sure your business name and address are correct.

How to Check an ABN Online

The quickest way to check an ABN is through the Australian Business Register (ABR). Follow these steps:

1️⃣ Go to the ABN Lookup Website

2️⃣ Enter the ABN or Business Name

  • Type the ABN number (if you have it) or search by business name.

3️⃣ Check the Status

  • The results will show if the ABN is active, cancelled, or inactive.
  • You’ll also see business details like GST registration status and entity type.

What If My ABN Is Inactive or Cancelled?

If your ABN appears as inactive or cancelled, you may need to:

  • Reapply for an ABN if your business is still operating.
  • Update your details if there has been an error.
  • Contact the ATO for further assistance.

Still Can’t Find Your ABN?

If you’ve tried the ABN Lookup tool and still can’t find your ABN, try these options:

  • Check Your Business Registration Documents – Your ABN might be listed on official business documents.
  • Look in Your Tax Records – Previous tax returns, BAS statements, or ATO correspondence may contain your ABN.
  • Check Your MyGov or ATO Online Account – If your ABN is linked to your MyGov account, you can find it there.
  • Contact the ATO for Assistance – If you still can’t locate your ABN, reach out to the Australian Taxation Office (ATO).

ATO Contact Details:

Business Enquiries: 13 28 66 (8:00 AM – 6:00 PM, Monday to Friday)
Website: www.ato.gov.au
Online Enquiries: Log in to MyGov and access your ATO account.