Reading time: 4 minutes

Looking for your tax file number?

Call the Australian Tax Office on 13 28 61 or visit the ATO website.

This website cannot assist you with finding your tax file number. Do not call our team as we are unable to help.

A Tax File Number (TFN) is a nine-digit number issued to you as a personal reference number for tax and superannuation. It is a unique number. You will also use your TFN if you are receiving government benefits, lodging an online tax return and applying for an Australian Business Number (ABN). For example, you will need it when filing a tax return. Once you have a tax file number, you have it for life no matter what changes happen in your life. So how do you keep track of it and find it when it has become lost?

Where Should I Look for My TFN?

How Do I Find my TFN?

If you are at home, in your office, or another place of work, the first place you can look is an income tax notice of assessment from the Australian Tax Office (ATO). You will find your TFN on the top right-hand corner of the assessment. Other documents that should display your TFN include payslips and superannuation statements.  However, these are not always readily available. If you do not have a TFN, you will need to fill out a tax file number application.

To find your tax file number, call the ATO on 13 28 61 or visit the ATO website.

Employment Essentials Factsheet

As an employer, understand your essential employment obligations with this free LegalVision factsheet.

Download Now

Finding Your TFN Online

In 2013, the government introduced myGov, a one-stop shop for many key government services including the ATO, Centrelink, Australian JobSearch, Medicare and My Health Record. If you run a business, you can also connect your ABN to your MyGov account, to access online government services for business. Importantly, you can view your TFN through your myGov account, so once you are registered, you will have this information at your fingertips no matter where you are.

I Have Lost My TFN

If you simply cannot remember your TFN, you can follow the tips on this page to help you find it again so you can continue using it. You can search in physical documents, look for it on myGov or simply call the ATO or visit their website to achieve this However, if you believe your TFN has been lost, stolen or accessed by an unauthorised third party, you should phone the ATO’s Client identity support centre to help you. By calling 1800 467 033, you can access advice, further information and implementation of security measures.

Key Takeaways

Your TFN is an important number, and you will need it when filing a tax return. If it falls into the wrong hands, it can be used by other individuals for identity fraud. This is why you should never keep it on a piece of paper in your wallet or save it on your mobile phone. Even sending it via text message or writing it on an online form is not 100% secure. The safest way to provide your TFN to an employer is by completing a TFN declaration form.

Note: We cannot assist you with finding your tax file number – contact the Australian Tax Office.

To find your tax file number, call the ATO on 13 28 61.

This website cannot assist you with finding your tax file number. Do not call our team as we are unable to help.

Can I find my TFN online?

Yes, if you have a myGov account and have connected your account with the Australian Tax Office, you can locate your TFN online. Your TFN will be located inside the My Profile > Personal Details menu.

How do I find my TFN from the ATO?

When you lodge your tax return, the Australian Tax Office will issue you with a Taxation Notice of Assessment. On this form, you will find your Tax File Number. Your TFN may also be located on your ATO Payment Summary.

Where can I find my TFN if I do not have a myGov account?

You can find out what your TFN is by calling the Australian Tax Office on 13 28 61 during business hours or contacting your accountant if you have one.

Why do I need a TFN?

While a TFN is not compulsory, you need one to avoid paying more tax than necessary. A TFN also assists you with lodging tax returns. Without a TFN, tax will be deducted from your income at the maximum rate.


New Kid on the Blockchain: Understanding the Proposed Laws for Crypto, NFT and Blockchain Projects

Wednesday 25 May | 10:00 - 10:45am

If you operate in the crypto space, ensure you understand the Federal Government’s proposed licensing and regulation changes. Register today for our free webinar.
Register Now

How to Expand Your Business Into a Franchise

Thursday 26 May | 11:00 - 11:45am

Drive rapid growth in your business by turning it into a franchise. To learn how, join our free webinar. Register today.
Register Now

Day in Court: What Happens When Your Business Goes to Court

Thursday 2 June | 11:00 - 11:45am

If your business is going to court, then you need to understand the process. Our free webinar will explain.
Register Now

How to Manage a Construction Dispute

Thursday 9 June | 11:00 - 11:45am

Protect your construction firm from disputes. To understand how, join our free webinar.
Register Now

Startup Financing: Venture Debt 101

Thursday 23 June | 11:00 - 11:45am

Learn how venture debt can help take your startup to the next level. Register for our free webinar today.
Register Now

About LegalVision: LegalVision is a commercial law firm that provides businesses with affordable and ongoing legal assistance through our industry-first membership.

By becoming a member, you'll have an experienced legal team ready to answer your questions, draft and review your contracts, and resolve your disputes. All the legal assistance your business needs, for a low monthly fee.

Learn more about our membership

Our Awards

  • 2020 Innovation Award 2020 Excellence in Technology & Innovation Finalist – Australasian Law Awards
  • 2020 Employer of Choice Award 2020 Employer of Choice Winner – Australasian Lawyer
  • 2020 Financial Times Award 2021 Fastest Growing Law Firm - Financial Times APAC 500
  • 2020 AFR Fast 100 List - Australian Financial Review
  • 2021 Law Firm of the Year Award 2021 Law Firm of the Year - Australasian Law Awards
  • 2019 Most Innovative Firm - Australasian Lawyer