I always thought the JWs were an internation organization but it appears they don't consider themselves to be that.
This was in a letter found on google was written by WT Loyd Vice President of the WTBS Australia, it was a submission to be treated as a Charity.
Issues Regarding Definitions Used in Australia Compared to Other Countries
The Society is not an international organization having branches in other countries.
However, Jehovah’s Witnesses are worldwide, and a different not-for-profit organization
is registered in each country. The structures of these corporations vary according to the
laws applying in each country. In some countries, such as the United States of America
and New Zealand, donors to our religious organizations are exempt from gift duty and
may claim tax deductions for donations made to the church.
Anyway, they were given charity status but not charity deductible status, which means people donating the the Australian org do not get a tax deduction.
The WBTS Australia has registered as a Public Company ABN 42 002 861 225 ACN 002 861 225. Their financial reports are available through ASIC for a fee and their 2005 report is on the internet.
I wasn't able to make a screen copy to attach it here.