A TFN is a number issued by the Australian Taxation Office to individuals, partnerships, trusts or companies. Each taxpayer has unique TFN which must be declared when you:

• loge a tax return,
• apply for certain income assistance or support payments,
• make or receive payments under Prescribed or Reportable Payment System,
• start or change jobs,
• have savings accounts or investments that earn income, or
• study at a tertiary institution under the HECS Scheme.