Choose your route

This guide is for a TFN you already have. It does not cover first applications or tax obligations.

Choose a route to your existing TFN
Your situationStart here
ATO linkedUse the account steps below.
ATO not linkedFollow Other ways in the government TFN guide.
Cannot sign inUse myGov sign-in help for your access problem.

Find the number in your linked account

You need access to your existing myGov account with the ATO linked.

  1. Type my.gov.au into your browser to open the official service.
  2. Sign in and select Australian Taxation Office (ATO).
  3. Select Find my TFN to view your number.

If the linked-account route is unavailable

For alternatives to linked access, open Other ways on the government TFN page and follow its ATO link.

For a forgotten username or password, use the matching recovery option on the sign-in page. A locked account has a separate unlock process. Follow the official sign-in help rather than repeatedly guessing your details.

Keep your details out of messages and public posts

Use the official app or enter my.gov.au directly. Do not respond to doubtful unsolicited messages claiming to be from the ATO or myGov.

If a scammer may have accessed your linked ATO service, contact that service. Contact your bank if you shared bank or card details. The myGov scam guide explains account security and identity support.

Common questions

Should I apply again because I have forgotten my TFN?

No. Use the retrieval route for your existing number; the government guide says to apply only once.

What if I can sign in but cannot see the ATO?

These steps require the ATO to be linked. For other ways to find your number, follow the ATO link under Other ways on the official TFN page.

Official information