Small Business Term 'ABN' - What does this represent?

Small Business Australia



Australian Business Number (ABN) - An ABN is a unique 11 digit
identifying number that businesses use when dealing with other businesses.

For example, all types of businesses, including small business, generally
need to put your ABN on your invoices, or other documents relating to
sales that you make.  If you don't, other businesses may withhold 46.5%
from any payment to you.

You also need an ABN in certain dealings with the Tax Office and other
areas of Government.

Registering for an ABN is not compulsory, but you will need one to register
for the GST (goods and services tax).