Australian Business Number (ABN) Validator
Validate Australian ABN
Enter an Australian Business Number to verify its validity.
Other Australian Identifiers
About this Validator
This tool validates Australian Business Numbers (ABN) according to the official format and validation rules established by the Australian Business Register (ABR).
The validator checks if a given ABN follows the correct structure and verifies the checksum digits using the official ATO algorithm.
This validation only confirms if an ABN follows the correct format. It does not verify if the number is actually registered with the Australian Business Register.
What is an Australian ABN?
The ABN is a unique 11-digit identifier issued by the Australian Business Register (ABR) and operated by the Australian Taxation Office (ATO). Introduced on 1 July 2000, it's essential for business operations in Australia.
ABN eligibility includes: • Carrying on an enterprise in Australia • Making supplies connected with Australia • Being a registered company under the Corporations Act 2001
An ABN is required for: • Tax invoices and related documents • GST registration • Business transactions • Government tender participation
If you need to generate an ABN for testing purposes, here is an Australian ABN Generator