What is an Australian ABN?

The ABN (Australian Business Number) is an 11-digit identifier issued by the Australian Business Register (ABR) to all entities carrying on a business in Australia. It is required to register for GST and to issue tax invoices.

How is the ABN check digit calculated?

Subtract 1 from the leftmost digit, then multiply all 11 digits by the weights 10, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19. Sum the results. The ABN is valid if the total is divisible by 89.

ABN Generator — Australian Business Number Generator (Free)

GenTools/ABN Generator

Country Tools:

Australian ABN Generator

Australia

Generate valid-format Australian Business Numbers (ABN) with correct check digits for testing. ABN is an 11-digit number used to identify businesses in Australia.

Generator

Format

Quantity

64 229 108 024

24 540 061 833

29 962 094 282

28 821 735 436

68 953 644 483

Validate ABN

ABN Check Algorithm

Length: 11 digits

Weights: 10, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19

Step 1: Subtract 1 from first digit

Step 2: Multiply each digit by its weight

Step 3: Sum must be divisible by 89

ABN vs ACN

ABN: 11 digits - for all business entities

ACN: 9 digits - for companies only

Companies derive their ABN from ACN

⚠️ Testing Only

These are randomly generated numbers for testing purposes only. Fraudulent use of ABN is a criminal offence.

What is This Tool?

An Australian ABN generator creates fictional 11-digit Australian Business Numbers with valid check digits. ABNs are issued by the Australian Business Register (ABR) and are required for GST registration, invoicing, and business-to-business transactions.

ABN validation: subtract 1 from the first digit, multiply each digit by weights (10,1,3,5,7,9,11,13,15,17,19), sum the products, and verify divisibility by 89. This generator produces numbers passing this check for realistic testing.

Common Use Cases

Invoice Software Testing

Test ABN validation on Australian tax invoices, GST calculations, and business-to-business billing.

ABR Lookup Integration

Validate ABN lookup API integrations and business verification features with format-correct test ABNs.

Government Procurement

Test AusTender and government procurement systems that require ABN for contractor registration.

Accounting Software

Validate MYOB, Xero, and QuickBooks integrations for Australian GST-registered businesses.

Frequently Asked Questions

Are generated ABNs registered businesses?

No. ABNs pass check digit validation but are not registered with the ABR.

What is the ABN format?

11 digits, typically displayed as XX XXX XXX XXX. The first two digits are derived from a check algorithm.

What is the difference between ABN and ACN?

ABN (11 digits) identifies businesses for tax. ACN (9 digits) identifies companies registered with ASIC. ABNs are often derived from ACNs.