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How to apply for an ABN as a sole trader
An ABN application is free and you make it through the Australian Business Register, using your own tax file number. If your details are verified automatically you can have the ABN within minutes; if the application needs manual review, business.gov.au says it can take up to 20 business days.
The short answer: apply free at the Australian Business Register, have your tax file number ready, and expect the result immediately if your identity details match automatically. You need to be genuinely carrying on a business — not a hobby, and not simply working as someone's employee.
It is free, and it is direct
The ABN is issued by the Australian Business Register, which the ATO manages. Applying directly is free. business.gov.au: Register for an Australian Business Number (ABN) sets out the process and the warning that matters most: there are commercial websites that will submit the same application for you and charge a fee for doing it. The form is not complicated enough to be worth paying a stranger to fill in, and you are handing over your identity details in the process.
Most people start from the Business Registration Service, which lets you apply for an ABN and add other registrations — GST, PAYG withholding, a business name — in a single run instead of four separate applications. ATO: Work out which registrations you need helps you work out which of those you actually need; for a sole trader with no employees and turnover under the GST threshold, the honest answer is often "just the ABN".
What you need before you start
- Your tax file number. As a sole trader you use your personal TFN. Providing it is what allows automatic verification and same-day approval.
- Proof of identity in the form the register asks for.
- Your business structure — for you, sole trader.
- What the business does, described in plain terms, and when it started or will start.
- Your contact and address details for the business.
Approval is usually immediate when the details can be checked automatically. If the application is referred for manual review, business.gov.au: Register for an Australian Business Number (ABN) says it can take up to 20 business days — which is worth knowing if a client is waiting for an invoice with an ABN on it. If you are about to start trading, apply before you need the number rather than the week you need it.
You have to actually be in business
An ABN is for an enterprise. You are not entitled to one merely because you would like one, and you are not entitled to one for work that is really employment, or for an activity that is a hobby. business.gov.au: Business structures goes through the structures themselves, and the practical test is whether you are carrying on a business in your own right — quoting for work, bearing the risk, and running it for profit rather than as a pastime.
The distinction matters in both directions. Even if you have a full-time job, you can still be a sole trader in the evenings and weekends and apply for an ABN for that activity; what disqualifies you is describing your employment as a business, or dressing up a hobby as one to claim deductions. Giving false or misleading information on an ABN application is taken seriously, and an ABN can be cancelled if it should not have been issued.
Trading name or your own name?
A sole trader can trade under their own legal name without any further registration. If you want to trade under a different name — "Harbour Electrical" rather than your own name — you must register that business name with ASIC. ASIC: Register a business name covers what that involves. A business name is not a legal entity and does not give you any exclusive rights to the name; it is a public record of who is behind it.
If you register for GST, the ABN and the business name are separate registrations with separate fees — the ABN is free, the business name is not. Do not assume that applying for the ABN also secures you the trading name.
Worked example: an ABN before the first invoice
A graphic designer starts freelancing while still employed. She wants to invoice her first client in a fortnight. She applies for the ABN with her TFN, described as a sole trader providing design services, and it is approved the same day. She runs the new number through the ABN format checker to confirm she has transcribed it correctly — an easy mistake to make between the screen and the invoice template — then adds it to the invoice. Two months later, when her projected turnover is heading past $75,000, she adds GST to the same registration rather than starting again.
What the ABN unlocks, and what it doesn't
Quoting an ABN is what stops a business customer withholding tax from your payment at the top rate. It is also the foundation for the other registrations: GST sits on top of an ABN, and so does PAYG withholding if you take on staff. But an ABN is not a licence, not a qualification, and not evidence you know what you are doing — for regulated trades you still need the licence or the ticket that the work itself requires.
Once you have the number, keep it visible: on your invoices, your quotes and anywhere a customer checks who they are dealing with. ABN Lookup (Australian Business Register): Format of the ABN explains how a valid ABN is built if you ever need to sanity-check a number a supplier has given you, and the ABN format checker runs that check in your browser. Remember that a correctly formed number only proves it is well formed — to confirm a business is actually registered, look it up on ABN Lookup.
Sources
Every figure and rule in this guide was read from an official Australian Government page (retrieved 2026-10-11). Rates, thresholds and dates change — check the linked page, or ask your accountant, before you rely on a number.
Last checked 2026-10-11 against the sources below. Written for Australian sole traders and small businesses.
Next step
Free toolABN format checker
confirm the number you were issued is correctly formed before you print it on an invoice.