Within the first week of arriving in Australia, most international students hear three letters that mean nothing to them yet: TFN. By the end of your first month, you'll wonder how you ever thought those three letters were confusing. Getting your Tax File Number is genuinely one of the simplest admin tasks you'll face here — and one of the most important.
Here's everything you need to know, from what a TFN actually is to how to get yours as quickly as possible.
What Is a Tax File Number?
A Tax File Number — TFN for short — is a unique nine-digit identifier issued by the Australian Taxation Office (ATO). It functions as your personal tax identity in Australia. Every time you earn income, pay tax, or interact with the Australian tax system, your TFN is involved.
You will need your TFN for:
- Starting a job and making sure the right amount of tax is taken from your wages
- Lodging your annual income tax return
- Opening certain Australian bank accounts
- Accessing government services tied to your income
Here's the practical reason students rush to get one: if you start work without a TFN, your employer is legally required to withhold tax from your pay at the top marginal rate. In 2026, that rate is 47 cents in every dollar. Compare that to the much lower rate that applies when you submit your TFN, and you can see why getting one quickly makes a real financial difference.
Can International Students Get a TFN?
✅Yes — any person lawfully residing in Australia, including international students on a valid subclass 500 student visa, is entitled to apply for a TFN. There is no waiting period and no minimum time in Australia required.
The best time to apply is as soon as you have a confirmed Australian residential address. That means you can apply in your first week.
How to Apply for Your TFN
The Online Method — Fastest and Easiest
For the vast majority of international students, applying online through the ATO website is the simplest route. Here is how it works:
- Visit the ATO website at ato.gov.au and navigate to the Tax File Number section
- Select the application pathway for foreign passport holders and temporary visitors
- Fill in the online form — you'll need your passport details and your Australian residential address
- Submit your application and note down your reference number
- Your TFN will arrive by post to your Australian address, typically within three to four weeks
Make sure you have a reliable Australian mailing address before you apply. Temporary hostel or short-stay accommodation addresses can cause delivery problems. If you're unsure, ask your university's student services office whether they can accept mail on your behalf.
The In-Person Method — Australia Post
If you prefer to apply face-to-face, or if the online process doesn't work for your specific visa type, you can apply through a participating Australia Post outlet:
- Download and complete the TFN application form from the ATO website, or pick one up at the post office
- Book an appointment at a participating Australia Post outlet (not all locations offer this service — check online first)
- Attend your appointment with your passport and visa grant letter
- Australia Post staff will verify your identity and forward your application to the ATO
- Your TFN will be mailed to you, typically within the same timeframe as the online process
What Documents Do You Need?
- Valid Passport (Your current foreign passport — must not be expired)
- Australian Visa (Your visa grant letter or ImmiCard showing your current visa status)
- Australian Address (A residential street address in Australia where mail can be received)
- Email Address (For your application confirmation and any ATO correspondence)
Can You Start Working Before Your TFN Arrives?
Yes, and you should not let a pending TFN stop you from starting work. Here is how to handle it:
- When your employer asks for your TFN, write 'applied for' on your tax declaration form
- Give your employer your ATO application reference number if they request it
- Once your TFN arrives, provide it to your employer immediately so they can update their records
Your employer should begin withholding tax at the correct rate from the moment you provide your TFN. Any difference in tax during the period you were waiting is reconciled when you lodge your annual tax return.
TFN vs ABN — What Is the Difference?
These two terms come up a lot, and they serve different purposes:
TFN (Tax File Number): Used by employees. If you work for an employer who pays you wages and withholds tax, a TFN is what you need.
ABN (Australian Business Number): Used by self-employed individuals, sole traders, and contractors. If you run your own small business or do freelance work, invoicing clients directly, you may also need an ABN.
Most students doing standard part-time or casual work only need a TFN. If you're doing gig-style work through certain platforms, check whether they require an ABN.
How to Keep Your TFN Safe
Your TFN is sensitive personal information. Treat it the way you would treat your passport number or bank account details. Only share it with:
- Your employer, when filling in a Tax File Number Declaration form
- Your bank, when setting up an account that earns interest
- The ATO directly
- A registered tax agent who is helping you with your return
⚠️Never share your TFN in response to unsolicited emails, phone calls, or social media messages — even if the caller claims to be from the ATO. The ATO will never cold-call you and demand your TFN.
What If You Forget or Lose Your TFN?
Your TFN is a permanent, lifelong number. It never expires and will not change. If you forget yours, you can find it on a previous tax return, in your myGov account (linked to the ATO), or by calling the ATO on 13 28 61 with your identity documents handy.
The Bottom Line
Getting your TFN is free, takes under 15 minutes to apply for online, and arrives within a few weeks. It's one of those tasks that feels like a big unknown until you actually do it — and then you wonder what all the fuss was about. Apply as soon as you have your Australian address sorted, keep your application reference number safe, and you'll be ready to work and manage your finances properly from the very start.
💡Find more practical Australian student guides at www.internationalstudenttips.com.au