6.3.2 Tax File Numbers & Taxation Information


Access to taxation information is essential for the effective assessment, collection and enforcement of child support. The Registrar is permitted to use tax file numbers (TFNs) to obtain and exchange information with the ATO.

Act references

CSRC Act section 16, section 16B, section 16C

CSA Act section 150, section 150B, section 150D

Income Tax Assessment Act 1936 section 202(ga)

Taxation Administration Act 1953 section 8WA, section 8WB, section 355-65

Privacy Act 1988 section 13, section 17, section 18


The child support legislation specifically refers to taxation information. For example, child support assessments are based on taxable income as assessed by the ATO, and the Registrar can collect debts by intercepting a tax refund. DHS also uses taxation information more generally for purposes related to the assessment, collection and enforcement of child support.

Authority to use taxation information

The exchange of information between DHS and the ATO is permitted by the secrecy provisions of the child support and taxation legislation (CSRC Act sections 16(2A), 16(3)(ca) and 16(6), CSA Act sections 150(2A), 150(3)(ca) and 150(6)). In addition, the child support legislation specifically authorises the Registrar to:

  • request, but not compel, a person to provide a written statement of their TFN (CSRC Act section 16B, CSA Act section 150B),
  • require the ATO to provide information the ATO possesses about people, including TFNs (CSRC Act section 16C(1), CSA Act section 150D(1)),
  • use that information to identify a person to decide whether a person can apply for a child support assessment, make or amend a child support assessment and decide whether a terminating event has happened (CSA Act section 150D(2)), and
  • use that information to identify a person to register and collect child support payments (CSRC Act section 16C(2)).

One of the objects of the TFN system is to facilitate the administration of the child support legislation (Income Tax Assessment Act section 202(ga)).The ATO can disclose protected information about taxpayers to DHS where the information is necessary for the administration of the child support legislation (Taxation Administration Act section 355-65).

The Privacy (Tax File Number) Rule 2015

The Privacy Commissioner, in the Office of the Australian Information Commissioner (OAIC), issued the Privacy (Tax File Number) Rule 2015, which regulates the collection, storage, use, disclosure, security and disposal of TFN information of individuals. The TFN rule is legally binding and a breach of the rule is an interference with individual privacy under the Privacy Act. The TFN rule recognises that DHS uses TFNs for child support purposes and explain some of DHS's obligations when collecting and using them. More detailed information about privacy is available at the OAIC's website.

Last reviewed: 1 July 2016