Australia Tax File Number

Catalogue reference for the Microsoft Purview built-in Australia Tax File Number sensitive information type, which detects an Australian tax file number (eight or nine digits passing the TFN checksum) corroborated by tax keywords. Microsoft recommends high confidence (85) for the built-in entity. This YAML-only record lets a package recipe include the Microsoft entity explicitly; it does not reproduce Microsoft's built-in regular expressions, keyword dictionaries, checksums or XML.

Type

keyword_list

Confidence

medium

Confidence justification

Medium confidence for this YAML-only record: its keyword logic finds references to the built-in entity name with Microsoft Purview context, not populated values. Microsoft's own recommended confidence for the entity is 85. The record does not claim to reproduce Microsoft's proprietary detection logic.

Jurisdictions

au

Regulations

Anti-Money Laundering and Counter-Terrorism Financing Act 2006 (Cth), Information Privacy Act 2009 (Qld), NDB Scheme (Cth), Privacy Act 1988 (Cth)

Frameworks

ISO 27001, ISO 27701, PCI-DSS, SOC 2

Data categories

pii, financial, government-id

Scope

specific

Risk rating

5

Should match

• Australia Tax File Number built-in SIT — Microsoft built-in entity name
• Australian Tax File Number catalogue reference — Name variant used for registry discovery
• DLP policy inventory - Microsoft Purview Rule: Builtin-au-tax-file-number Condition: Australia Tax File Number (built-in entity e29bc95f-ff70-4a37-aa01-04d17360a4c5), high confidence, instance count 1 or more Action: notify sender — DLP rule inventory row naming the built-in entity with Microsoft Purview context

Should not match

• Tax file number: 123 456 782 — Populated value or sibling reference without the built-in entity name
• TFN declaration form guidance — Populated value or sibling reference without the built-in entity name
• Australian Taxation Identifier catalogue entry — Populated value or sibling reference without the built-in entity name

Known false positives

• Documentation and policy inventories can mention the Microsoft built-in entity by name. Mitigation: Treat this YAML-only record as catalogue discovery; enable the Microsoft entity for value detection.
• The custom SIT au-taxation-identifier detects the same data; deploying both doubles matches on the same content. Mitigation: Pick one per package. The custom SIT is the default; include this built-in only by an explicit recipe decision.

References

• Australia Tax File Number entity definition - Microsoft Learn
• Sensitive information type entity definitions - Microsoft Learn