What Is TFN Australia and Why You Need One

Summary

A Tax File Number (TFN) is a unique 9-digit number issued by the Australian Taxation Office (ATO) that identifies you for tax and superannuation purposes — you keep the same TFN for life, regardless of whether you change jobs, move states, change your name or leave and return to Australia; it is used by your employer to calculate the right amount of tax to withhold, by your bank to report interest to the ATO and by your superannuation fund to receive your contributions correctly

Without a TFN, your employer must withhold tax from your wages at the highest marginal rate of 47% — significantly more than most workers would normally pay; applying for a TFN as soon as you arrive and have an Australian address is one of the most important first financial steps for any new migrant; the application is free, takes approximately 20 minutes online and the TFN arrives by post within 28 days

A TFN is confidential — share it only with your employer, super fund, bank and the ATO — never give your TFN to recruiters, landlords, social media contacts or in response to unsolicited requests; misuse of a TFN is a serious offence under Australian law; if you believe your TFN has been compromised, contact the ATO immediately

If you have just arrived in Australia and started the process of setting up your financial life — bank account, employment, superannuation — you will encounter the TFN at every step. It is the foundation of the Australian tax system for individuals, and getting one early makes everything else easier.

What is a TFN? What is TFN Australia?

A Tax File Number is a unique 9-digit identifier issued by the Australian Taxation Office. It is used to:

Track your tax obligations — all income you earn in Australia is reported to the ATO against your TFN
Enable correct PAYG withholding — your employer uses your TFN to apply the right tax rate to your wages
Receive superannuation contributions — your employer pays super into your fund using your TFN; without it, your fund holds contributions in a low-interest account until you provide one
Lodge tax returns — your TFN is required to file an Australian tax return through myGov
Bank account interest reporting — your bank reports interest earned to the ATO against your TFN; without a TFN provided to your bank, interest is withheld at the highest rate

Your TFN is yours for life. It does not change if you move states, change jobs, get married, change your name or leave and return to Australia. There is only ever one TFN per person — the ATO does not issue new ones if you lose it (they help you find your existing one).

Why do you need a TFN?

Avoid 47% tax withholding

This is the most urgent reason. Under Australian tax law, if you do not provide a TFN to your employer, they are legally required to withhold tax from your wages at the highest marginal tax rate — currently 47% (including the Medicare levy). For most workers, the actual rate they should be paying is significantly lower — 19%, 32.5% or 34.5% depending on their income.

Overpaid tax is refunded when you lodge your tax return — but this means waiting until after 30 June to receive money that should have been in your pocket throughout the year.

Apply for your TFN as soon as you have an Australian address — even before you start your first job if possible.

Set up superannuation

Your employer must pay the Superannuation Guarantee (11.5% of your wages in 2025-26) into a superannuation fund of your choice. To link your super fund to your employer and receive contributions correctly, your fund needs your TFN. Without it, your contributions may be held as unclaimed money or taxed at a higher rate.

Access myGov and ATO online services

myGov is the Australian Government’s online portal for tax returns, Medicare, Centrelink and other services. Your TFN is required to create an ATO account within myGov — giving you access to your income statement, tax return lodgment, HECS-HELP balance and superannuation details.

Bank accounts

When you open an Australian bank account, the bank will ask for your TFN. You are not legally required to provide it — but if you do not, the bank will withhold tax from any interest earned at the highest rate (47%) and report this to the ATO. Providing your TFN ensures interest is taxed at your correct marginal rate.

How to apply for a TFN in Australia

Applying for a TFN is free and straightforward. The process differs slightly depending on your visa status.

For migrants and temporary visitors with a work rights visa

If you hold a valid Australian work rights visa — including permanent resident visas, student visas with work conditions, working holiday visas, skilled worker visas and most other temporary visas with work rights — you can apply online through the ATO’s Individual Auto-Registration (IAR) system.

Requirements:

Must already be in Australia (the application uses your Australian address)
Must hold a valid work rights visa linked to your passport
Your device must be set to an Australian time zone when submitting

Apply at: ato.gov.au (search “TFN application for foreign passport holders and permanent migrants”)

Time: Approximately 20 minutes

Cost: Free

What you need:

Australian passport or foreign passport (number and details)
Your Australian residential address and postal address
Your visa details (the ATO verifies these with the Department of Home Affairs)
Contact details (email and phone)

After you apply:

Save your ATO receipt ID — this is not your TFN, but it proves you have applied; you can show it to your employer while waiting for your TFN to arrive
Your TFN is sent by post to the Australian address you provided — allow up to 28 days
Do not lodge another application during the 28-day waiting period

For New Zealand citizens

New Zealand citizens are automatically granted Australian work rights on arrival in Australia — they do not need to apply for a separate work visa. This means NZ citizens can apply for a TFN using the online IAR system as soon as they arrive and have an Australian address.

For Australian citizens and permanent residents born in Australia

Apply online at ato.gov.au using the standard Australian resident TFN application, or in person at a participating Australia Post outlet (free, no appointment needed) or a Services Australia service centre.

Where to find your TFN once issued

Your TFN is sent in a letter from the ATO to the postal address you provided. Once received:

Store it somewhere secure — a password manager, a locked file or a secure document storage service
Do not photograph it and store it in cloud services that are not secured
If you lose your TFN, log into myGov (ATO linked services) to find it, or call the ATO on 13 28 61

Your TFN can also be found on:

ATO correspondence (tax return notices, income statements)
Your myGov account (under ATO linked services)
PAYG payment summaries from previous employers
Your superannuation fund statements

Who to give your TFN to

Your TFN is confidential personal information. Only certain organisations have a legal right to request it:

Give your TFN to:

Your employer — on the TFN declaration form when you start work
Your superannuation fund — when you set up your super account or change funds
Your bank — when opening or updating an account
The ATO — in tax returns, correspondence and myGov
Centrelink (Services Australia) — if claiming government payments
Study Assist / HECS-HELP — if taking out a student loan

Do not give your TFN to:

Recruiters or labour hire agencies (they do not need it — only your actual employer does)
Landlords or real estate agents
Anyone requesting it unsolicited by phone, email or social media
Websites or services not listed above

What happens if your TFN is misused: TFN misuse is a serious offence under the Privacy Act 1988. If you believe your TFN has been stolen or misused — contact the ATO immediately on 13 28 61 and report it to the Office of the Australian Information Commissioner (OAIC).

TFN and your payslip

When you start work, you must complete a TFN declaration form for your employer — either the paper form (NAT 3092) or the online equivalent through myGov. This tells your employer:

Your TFN
Whether you are an Australian resident for tax purposes
Whether you have a study or training support loan (HECS-HELP)
Whether you want to claim the tax-free threshold

The tax-free threshold: Australian tax residents can elect to claim the tax-free threshold — meaning the first $18,200 of income is tax-free. Only claim this with one employer (your primary employer) if you have multiple jobs. Claiming it with more than one employer at the same time can result in a tax debt at the end of the year.

FAQs (frequently asked questions)

What is a TFN in Australia?

A unique 9-digit number issued by the ATO that identifies you for tax and superannuation. You keep it for life. Used by employers, banks, super funds and the ATO to manage your tax obligations.

How do I apply for a TFN in Australia?

Apply free online at ato.gov.au. Must be in Australia with a valid work rights visa and an Australian address. Takes approximately 20 minutes. TFN arrives by post within 28 days.

What happens if I work without a TFN?

Your employer must withhold tax at the highest rate — 47%. The excess is refunded when you lodge your tax return, but you wait until after 30 June to receive it.

Can I work in Australia without a TFN?

Yes — you can start work without one, but your employer will withhold 47% tax until you provide it. Apply as soon as you have an Australian address.

How long does a TFN take?

Up to 28 days from when the ATO receives your completed application. Save your receipt ID as proof you have applied.

Is a TFN free?

Yes — completely free to apply through the ATO directly. Any website charging a fee for a TFN application is a third party adding a service fee on top. Use ato.gov.au directly.

Can I have more than one TFN?

No — the ATO issues one TFN per person for life. If you think you have been issued two TFNs, contact the ATO to consolidate them.

Where can I find my TFN if I have lost it?

Log into myGov and navigate to ATO linked services. Your TFN is also on ATO correspondence, previous tax returns and super fund statements.

Related guides

This guide is for general information only. TFN rules and withholding rates may change — always verify at ato.gov.au. Last updated September 2026.

Sources: ATO — Tax file number (ato.gov.au, June 22, 2026) | ATO — Permanent migrants and temporary visitors TFN application (ato.gov.au, July 6, 2026) | ATO — Online TFN registration (ato.gov.au, April 14, 2026) | eduyush.com — TFN Guide for New Migrants in Australia (May 25, 2026) | atlasmigration.com — Tax File Number Australia

What is a tax file number (TFN) in Australia?