Generate a test Australia Tax File Number
An Australian Tax File Number (TFN) is nine digits validated by a weighted modulo-11 checksum. These test values are synthetic but checksum-valid.
Synthetic · not collision-guaranteed Validate a number →
271 342 175
Synthetic TFN with a valid checksum. Not a real issued number.
Format specification
| Identifier | Tax File Number (TFN) |
|---|---|
| Country | 🇦🇺 Australia |
| Format | 000 000 000 |
| Length | 9 characters |
| Checksum | Weighted MOD 11 |
| Example | 123 302 035 |
| Safe strategy | Synthetic |
| Data quality | Verified against sources |
Validation regex
Matches the canonical value — strip separators and uppercase first: value.replace(/[^A-Za-z0-9]/g, '').toUpperCase()
^\d{9}$ References
Common questions
Will these pass my validation?
Yes — they are well-formed Tax File Number values (000 000 000) and pass standard format checks, including the Weighted MOD 11 checksum.
Could one belong to a real person?
These are synthetic values. They are format-valid but not drawn from a guaranteed reserved range, so use them only for testing.
Can I generate many at once?
Increase the count, or use the free API and CSV/JSON export for large datasets.
For software testing only. These numbers are synthetic and must never be used
for real-world identification, applications, or to impersonate anyone.