Do sole traders need an ABN?

Find out when a sole trader may need an ABN and what the ATO says about business registrations.

Summary

A sole trader may need an Australian business number, commonly called an ABN, when carrying on a business or enterprise. The ATO provides registration guidance covering ABNs, business names, and other tax registrations.

What this means

An ABN helps identify your business when dealing with other businesses, government agencies, and tax systems. For many sole traders, applying for an ABN is one of the first setup steps.

However, having an ABN does not automatically mean you are registered for GST, PAYG withholding, or other tax roles. Those registrations depend on your circumstances.

Typical actions

  • Check whether your activity is a business or a hobby.
  • Apply for an ABN if required.
  • Check whether you also need GST, PAYG withholding, or other tax registrations.
  • Keep your ABN details up to date.
  • Avoid applying for an ABN if your activity is not actually a business.

Official ATO sources

Last checked: 20 June 2026

Business or company registrations
Explains business registration obligations, including ABN-related setup.

Australian business number — ABN
Provides ATO information about ABNs and registration forms.

Working as an independent contractor
Explains contractor arrangements and notes that independent contractors generally need an ABN and may need other business tax registrations.

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Important notice: Tax Clarity is an independent information tool. This page provides general information based on official sources. It does not provide tax, legal, financial, or accounting advice. Tax rules can change, and how they apply depends on your circumstances. For advice about your situation, speak with a registered tax agent or qualified professional.

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