Overview
A tax file number (TFN) is a unique nine-digit number we issue to individuals and organisations to help us administer tax and other Australian Government systems.
We only issue one TFN to you during your lifetime, even if you change your circumstances.
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If you change your name or address, you should tell us so we can update your details.
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How to find your TFN
If you already have a TFN but you don't know where it is, you may have documents that contain it, such as a notice of assessment or a payment summary from your employer. Alternatively, if you use a registered tax agent, they can tell you your TFN.
Applying for a TFN
If you've never been issued with a TFN, you can apply for one. You'll receive your TFN no more than 28 days after we receive your completed application.
Changing your name or address
You can contact us by phone, mail or in person to change our records of your name and address, your contact details and to add or update your nominated representative.
Using your TFN and keeping it safe
There are a number of situations where you will be asked to provide your TFN, such as when you start work or change jobs, apply for income assistance or join a superannuation fund. You should keep it secure and only disclose it to certain individuals or organisations for tax-related purposes.
TFNs for school students
Most secondary school students are able to get a TFN through the secondary schools TFN program. This is an easier way to apply because you don't have to provide us with any documents to prove your identity - the school identifies you.
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If you operate a partnership, trust or company and want to know how to apply for a TFN, refer to Tax basics for small business or visit the Australian business register website at www.abr.gov.au to apply for an Australian business number (ABN) and TFN.
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Last Modified: Tuesday, 26 February 2013