ABN Checker
Check whether an Australian Business Number has a valid format and check digits.
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How to do it
- 1Fill in the boxes
Type your numbers or pick the options you need.
- 2See the result
The answer updates right away as you change a value.
- 3Use it
Copy the result or note it down. Nothing is sent anywhere.
About this tool
Type an ABN with or without spaces. The tool applies the official check-digit rule: subtract 1 from the first digit, multiply each digit by its weight and test that the sum divides by 89. It checks the number format only, not whether the business exists. Use the ABN Lookup site to confirm a business.
Frequently asked questions
Does a valid result mean the business exists?
No. It only means the number is correctly formed. Confirm it on the ABN Lookup website.
How long is an ABN?
11 digits, usually written as 2, 3, 3 and 3 digits.