ABN Generator

Generate Australian Business Numbers (ABN) with valid checksum

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About Australian Business Numbers (ABN)

An Australian Business Number (ABN) is an 11-digit identifier issued by the Australian Taxation Office (ATO). This generator creates valid ABN format numbers with proper checksum validation for testing and educational purposes.

The last nine digits are the identifier itself and the first two are a checksum prefix, worked out so that a weighted sum of all eleven digits divides evenly by 89. That is why an ABN cannot simply be eleven random digits: a form, an accounting package or an import script will reject it. Everything this tool produces satisfies the checksum, so it exercises your validation code the way a real number would.

Already have a number and want to know whether it is well formed? Use the ABN validator, which also reads the ACN out of a company ABN. For the nine digit company number on its own, see the ACN generator.

Disclaimer

Important: Generated numbers are NOT real Australian Business Numbers issued by the ATO and have NO legal validity. They are for testing and educational purposes only.

Prohibited Uses: You must NOT use generated ABNs for:

  • Actual business registration or official business activities
  • Tax filing or tax-related purposes
  • Identity verification or authentication
  • Any fraudulent or illegal activity

Legal Consequences: Misuse of generated ABNs may result in:

  • Criminal prosecution under A New Tax System (Australian Business Number) Act 1999 and Criminal Code Act 1995
  • Investigation by the Australian Taxation Office (ATO)
  • Civil liability, fines, and/or imprisonment

Your Responsibility: By using this tool, you acknowledge that you understand these risks and agree to use it only for legitimate testing purposes. You are solely responsible for any misuse of generated numbers.