Tax File Number (TFN): How to Apply as an International Student in Australia
If you are an international student in Australia and about to start your first job, applying for a Tax File Number (TFN) is one of the first things you should do. A TFN is your personal reference number in the Australian tax system, and having one means you keep more of what you earn instead of losing nearly half of it to withholding tax. This guide walks you through what a TFN is, whether you need one, exactly how to apply through the Australian Taxation Office, and what to do once your number arrives. Last updated: July 2026 What Is a Tax File Number (TFN)? A Tax File Number (TFN) is a unique nine-digit number issued by the Australian Taxation Office (ATO). It identifies you in Australia’s tax and superannuation systems, and you keep the same number for life, even if you change visas, jobs, or leave and return to Australia. Your TFN is not a work permit and it does not give you the right to work. Your visa does that. Instead, the TFN is what lets your employer tax you correctly, what your super fund uses to accept your contributions, and what you quote when you lodge a tax return. Think of it as your key to the tax system, not permission to enter it. Do International Students Actually Need a TFN? Strictly speaking, a TFN is not compulsory. But if you plan to work while you study, going without one is an expensive choice. Most international students hold a Subclass 500 student visa, which allows limited work, and the moment you take a job, a TFN starts to matter. Resident for Tax Purposes and the Tax-Free Threshold Here is the part that surprises many students: if your course runs for six months or longer, the ATO generally treats you as an Australian resident for tax purposes, even though you are not a permanent resident or citizen. That status is good news. It means you can access the tax-free threshold, so the first AUD 18,200 you earn in a full financial year is not taxed at all. You only claim that threshold if you have a TFN and complete a TFN declaration with your employer. What Happens if You Work Without a TFN Without a TFN, your employer is legally required to withhold tax at the top rate of 47%, made up of the highest marginal rate plus the Medicare levy. On a casual wage, that is a painful cut. You often get some of it back when you lodge your tax return, but you are effectively giving the government an interest-free loan until then. There is one safeguard: if you have applied for a TFN and told your employer, you get a 28-day grace period during which you are taxed at the normal rate. Provide the number within those 28 days and you avoid the 47% problem entirely. How to Apply for a TFN: Step-by-Step Applying is free and, for most students, takes about 20 minutes online. Here is the process from start to finish. Step 1: Check You Can Apply Before you begin, confirm two things. You must hold a valid visa with work rights, and you must be physically in Australia. The standard online application, called Individual Auto-Registration (IAR), is built for foreign passport holders, permanent migrants, and temporary visitors who are already onshore. If you have not landed yet, wait until you arrive. Step 2: Gather Your Details Have these ready before you open the form: Step 3: Apply Online via the ATO Go to the ATO’s apply for a TFN page and open the online Individual Auto-Registration form. Fill in your details, submit, and save the application reference number the system gives you. Keep that reference number safe, as it is how you track your application if you need to follow up. Step 4: Wait for Your TFN The ATO posts your TFN notification to your Australian postal address within 28 days. Do not submit a second application while you wait, because duplicate applications slow everything down. If 28 days pass with nothing in your mailbox, contact the ATO to check on it. Important: if your term address changes soon after you apply, make sure mail can still reach you. A TFN letter sent to an address you have moved out of is the most common reason students never receive their number. After You Get Your TFN Once your TFN arrives, the first thing to do is complete a TFN declaration for your employer. These days this is usually handled digitally through your employer’s onboarding system or ATO online services linked to your myGov account, rather than a paper form. This declaration tells your employer your TFN and lets them apply the tax-free threshold and the correct withholding rate. Your TFN also connects you to superannuation. If you are employed, your employer pays super on top of your wages, currently at a rate of 12% for the 2026 financial year, into a super fund account. The old rule that only kicked in above AUD 450 a month was removed in July 2022, so you now earn super from your first dollar. When you leave Australia permanently, you can claim that money back through a Departing Australia Superannuation Payment (DASP). Finally, keep your TFN private. Give it only to your employer, your super fund, your bank, and the ATO. Never put it in a job application or send it over social media, as your TFN is a prime target for identity theft. If Your Visa Has No Work Rights or You’re a Foreign Resident The online application assumes you have work rights and are in Australia. If your visa does not permit work, or the ATO classifies you as a foreign resident for tax purposes, you generally cannot use the standard online form. Instead, you complete the ATO paper form for people living outside Australia, which requires certified copies of your identity documents posted to the ATO. This route is slower, so if
