The tax file number (TFN) is a unique identifier issued by the Australian Taxation Office to each taxpaying entity — an individual, company, superannuation fund, partnership, or trust.
| Type | datatype | |
| Is personal identifiable information (PII) ? | True | |
| Regular expression | \d{3}\s\d{3}\s\d{3} | |
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| Classification | Classification | identifier |
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