A Tax File Number is a nine-digit number — often written in groups of three, like 123 456 789. Older TFNs may have eight digits. There is no TFN card or certificate: the ATO sends you a letter with your number.
Where your TFN appears
| Document | Where to look |
|---|---|
| The ATO letter | The letter you received when your TFN was issued. |
| Notice of assessment | Near your personal details at the top of the notice. |
| ATO online services (via myGov) | Under your personal details. See how to find your TFN on myGov. |
| Super statements | Sometimes shown in your account details. |
| Payslips | Usually not shown, or shown partly masked. |
Is it the same for visa holders?
Yes. International students, working holiday makers and temporary residents get exactly the same nine-digit format as Australian citizens. The number stays yours for life, even if you leave Australia and return years later.
TFN vs ABN format
| TFN | ABN | |
|---|---|---|
| Digits | 9 (sometimes 8) | 11 |
| Identifies | You, personally | A business or enterprise |
| Public? | No — keep it private | Yes — it appears on invoices and in ABN Lookup |
How to keep it safe
- Only share it with your employer, bank, super fund, the ATO or a registered tax agent.
- Don't send it by text, social media or unencrypted email.
- Don't keep a photo of your TFN letter on your phone without protection.
- If you think it's been misused, contact the ATO immediately.
Lost it? Read where to find your TFN. Don't have one yet? See how to apply for a TFN.