A unique identifying number assigned to a taxpayer by tax authorities.
 all his workers had produced tax file numbers and bank account details
 Example sentencesExamples
-  Recent changes mean you may only obtain a tax file number from one of 16 regional tax offices.
 -  It will make it harder for his mates to hire people who don't have a visa, workers compensation or a tax file number.
 -  You will be required to submit an Australian Tax Office declaration form providing your Tax File Number.
 -  They must somehow get from the airport to housing, pay rent, feed themselves, and apply for a tax file number.
 -  Registration at the town hall will enable the participant to obtain a tax file number.
 -  The government is also now asking universities to request tax file numbers for students in the loan programs.
 -  Applicants needed to supply their tax file number and old statements.
 -  The Tax Office issued about half a million new tax file numbers.
 -  He needed to be persistent when obtaining a tax file number and applying for a residence card.
 -  All taxpayers have to have a tax file number.