What is a Tax File Number and Why You Need One

A Tax File Number (TFN) is a unique 11-digit identifier issued by the Australian Taxation Office (ATO). If you're new to Australia—whether you're here to work, study, or settle with your family—a Tax File Number is one of the most important pieces of identification you'll need. Think of it as your personal tax identification number in Australia, used to track your income, tax payments, and financial dealings with the Australian government.

Your TFN is personal to you and stays with you for life. You'll use it when you work, study, invest, claim government benefits, or deal with the ATO. It's similar to a tax identification number you might have in your home country, though the specific rules and uses differ in Australia. The number itself is permanent—even if you leave Australia and return years later, you keep the same TFN. The ATO issues TFNs free of charge. There's no fee to apply, and the process is straightforward for most people.

Getting a TFN should be one of your first priorities when you arrive in Australia. If you're planning to work, your employer will ask for your TFN on your first day. If you don't have one, your employer may need to withhold tax at the highest possible rate (currently 45% plus Medicare levy), which means significantly less money in your pocket each week. This is one of the most common reasons new arrivals apply for a TFN immediately. Without a TFN, you could lose thousands of dollars in unnecessary tax withholding over just a few weeks of work.

Who Can Apply for a Tax File Number in Australia

You can apply for a TFN if you have the legal right to be in Australia. This includes:

  • Australian citizens
  • Permanent residents
  • Temporary visa holders with work rights (skilled temporary visas, working holiday visas, student visas with work permission)
  • New Zealand citizens with a Special Category Visa
  • People with other legal status that allows you to be in Australia

If you're on a visitor visa without work rights, you generally won't be eligible for a TFN unless you have a specific exemption. However, if your visitor visa is later upgraded to a work visa, you can apply for a TFN at that time.

The key requirement is that you must have the legal right to be in Australia. The ATO will verify your visa status when you apply, so make sure your visa is current and valid. If you're unsure about your eligibility, contact the ATO on 13 28 61 (within Australia) or check the ATO website before applying. You can also contact the Department of Home Affairs if you have questions about your visa status and work rights. Temporary residents, including international students and skilled temporary visa holders, can apply for a TFN as long as they have work rights attached to their visa.

How to Apply for a Tax File Number

Applying for a TFN is straightforward and free. There are several ways to apply, depending on your situation and how quickly you need your TFN. The online method is fastest and most convenient for most new arrivals.

Online Application (Fastest Option)

The easiest and fastest way to apply is online through the ATO website. You can apply at the ATO's TFN application page. To apply online, you'll need:

  • Your passport or travel document details (number and country of issue)
  • Your date of birth
  • Your Australian residential address
  • Your contact details (phone number and email)
  • Your visa details (visa type and expiry date)

The online application usually takes about 10 minutes to complete. If you apply online, you'll typically receive your TFN immediately or within a few business days. Many people receive their TFN on the same day they apply. Once you receive your TFN, you'll get a letter from the ATO with your number and other important information. This is the recommended method for most new arrivals because it's quick, convenient, and you can do it from home.

Application by Mail (Slower Option)

You can also apply by post using the TFN application form (NAT 1432). You'll need to download the form from the ATO website, complete it, and mail it to the address provided. This method takes much longer—usually 4 weeks or more—so it's not recommended if you need your TFN quickly. However, it may be an option if you don't have internet access or prefer to apply on paper. If you choose to apply by post, allow at least 4 to 6 weeks for processing and delivery of your TFN letter.

In Person at an ATO Office

You can visit an ATO office to apply in person. This can be helpful if you need assistance or have questions about the application process. However, you'll need to book an appointment first. Visit the ATO website to find your nearest office and book an appointment. In-person applications typically take 1 to 2 weeks to process after your appointment. This option is useful if you have complex circumstances or need help with your application.

Through myGov

If you have a myGov account linked to the ATO, you can apply for a TFN through your myGov dashboard. This is another quick option and works similarly to the online application. You'll need to set up a myGov account first if you don't already have one. Setting up myGov is free and takes about 10 minutes. Once your account is set up and linked to the ATO, you can apply for your TFN through the myGov portal and receive your number within a few business days.

What to Do After You Receive Your Tax File Number

Give Your TFN to Your Employer

Once you have your TFN, give it to your employer as soon as possible. This ensures your tax is withheld correctly and you're not paying more tax than you need to. Your employer will ask for your TFN on your first day of work or during the hiring process. Without it, they'll withhold tax at the highest rate, which will reduce your take-home pay significantly. If you start work before receiving your TFN, inform your employer that you've applied and provide the number as soon as it arrives.

Keep Your TFN Safe and Private

Your TFN is sensitive information. Only share it with organisations that genuinely need it—your employer, your bank, your landlord, or the ATO itself. Never share your TFN on social media, with strangers, or with organisations you don't trust. Identity theft and fraud involving TFNs do happen in Australia, so protect yours carefully. If someone calls or emails claiming to be from the ATO and asks for your TFN, be cautious. The real ATO will never ask for your TFN by phone or email unsolicited. Report any suspicious requests to Scamwatch.

Write Down Your TFN and Keep It Safe

Write down your TFN and keep it in a safe place. You'll need it for many transactions throughout your time in Australia. Some people keep a photo of their TFN letter in their phone (in a secure location) for easy reference. However, don't carry the original letter around with you—keep it at home in a safe place. If you lose your TFN letter, you can always contact the ATO to request a replacement. Store your TFN somewhere secure, such as a locked drawer or safe at home.

Update Your Details if They Change

If your address, name, or other details change, you should update the ATO. You can do this online through myGov or by contacting the ATO directly on 13 28 61. Keeping your details current helps ensure you receive important correspondence from the ATO and that your tax records are accurate. This is especially important if you move house or change your phone number.

Common Issues and How to Solve Them

Lost or Forgotten TFN

If you lose your TFN or forget your number, you can contact the ATO to request a replacement. They'll ask you to verify your identity before issuing a new one. You can call the ATO on 13 28 61 or visit the ATO website. The ATO can usually provide your TFN over the phone if you can verify your identity with details like your date of birth and address. Keep a record of your TFN in a safe place to avoid this situation.

TFN Not Received After Applying

If you applied online and haven't received your TFN within a few business days, check your email (including spam folder) for a letter from the ATO. If you still haven't received it after 5 business days, contact the ATO on 13 28 61 to check the status of your application. Have your passport number and date of birth ready when you call. The ATO can confirm whether your application was received and provide an estimated timeline for your TFN to arrive.

Concerns About TFN Security or Fraud

If you think your TFN has been compromised or used fraudulently, contact the ATO immediately on 13 28 61. You can also report identity theft to the Australian Federal Police through the Scamwatch website. The ATO takes TFN fraud seriously and can help protect your account and investigate any suspicious activity. Act quickly if you suspect fraud to minimise potential damage to your tax record.

TFN for Young People Under 18

Young people under 18 can apply for a TFN if they have the legal right to be in Australia and are working or studying. Parents or guardians can help with the application. The process is the same as for adults, and the TFN is issued free of charge. Having a TFN allows young workers to ensure their tax is withheld correctly and they receive the right amount of income in their pay.

Sources

Frequently Asked Questions

Can I apply for a Tax File Number online?

Yes, you can apply online through the ATO website, which is the fastest method. Online applications typically take 10 minutes to complete, and you'll usually receive your TFN within a few business days or sometimes on the same day.

Can temporary residents and international students apply for a Tax File Number?

Yes, temporary residents including international students and skilled temporary visa holders can apply for a TFN if they have work rights attached to their visa. You'll need to provide your visa details when applying.

How long does it take to receive a Tax File Number?

Online applications typically take a few business days or sometimes the same day. Applications by post take 4 to 6 weeks, and in-person applications take 1 to 2 weeks to process.

What should I do if I lose my Tax File Number?

Contact the ATO on 13 28 61 and they can provide your TFN over the phone if you verify your identity with details like your date of birth and address. You can also request a replacement letter.

What is the difference between applying online and by post for a Tax File Number?

Online applications are faster (a few business days) and more convenient, while postal applications take 4 to 6 weeks. Online is recommended unless you don't have internet access.

Can I apply for a Tax File Number through myGov?

Yes, if you have a myGov account linked to the ATO, you can apply through your myGov dashboard. Setting up myGov is free and takes about 10 minutes.

What happens if I don't have a Tax File Number when I start work?

Your employer will withhold tax at the highest possible rate (45% plus Medicare levy) until you provide your TFN, which significantly reduces your take-home pay. Apply for a TFN before starting work if possible.

Can young people under 18 apply for a Tax File Number?

Yes, young people under 18 can apply for a TFN if they have the legal right to be in Australia and are working or studying. The process is the same as for adults, and it's free.

This is general information only. It is not legal, migration, financial, tax, medical, or professional advice. Always check official sources before acting.