How to Register an ABN: Free, Step by Step

Registering an ABN is free, takes about 15 minutes online, and in most cases your number is issued on the spot. Yet plenty of Australians pay $50 to $100 to lookalike websites for exactly the same thing, or get stung by fake "renewal" letters for a number that never expires. Here's how to do it properly, on the official government site, without paying a cent.

What an ABN is and why you need one

An Australian Business Number (ABN) is a unique 11-digit number that identifies your business to the government, other businesses and the public. It's issued by the Australian Business Register (ABR), run by the ATO. You'll need one to:

Invoice other businesses. Without an ABN on your invoice, other businesses generally have to withhold 47% of your payment under the "no ABN withholding" rules and send it to the ATO. That alone is reason enough.
Register for GST or a business name — both require an ABN first.
Get a .com.au or .au domain name, which requires an ABN or other eligible Australian presence.
Deal with suppliers, wholesalers and government agencies, most of whom will ask for it before opening an account.

One thing an ABN is not: a substitute for a tax file number, or proof you're a legitimate business. It's an identifier, nothing more — you still declare your business income in your tax return either way.

Who can get an ABN (and who can't)

Not everyone is entitled to an ABN. To get one, you must be carrying on (or starting) an enterprise in Australia — genuinely running a business, not just earning money. Signs you're carrying on an enterprise:

You intend to make a profit, and the activity is repeated or ongoing, not a one-off
You operate in a business-like way — quoting, invoicing, keeping records, advertising
You decide how, when and where you work, provide your own tools, and carry the commercial risk (you fix mistakes at your own cost)

You are not entitled to an ABN for work you do as an employee — even if your employer calls it contracting, and even if they tell you to "go get an ABN". That's a classic sham contracting move: the employer shifts their obligations (super, leave, workers compensation) onto you by pretending you're a business. Apprentices, trade assistants and labourers working under someone else's direction are almost never entitled to one for that work. If an employer insists you need an ABN to get the job, treat it as a red flag and check the ATO's guidance first.

The ABR does check, and it cancels ABNs where the holder isn't actually running an enterprise.

Sole traders, partnerships, companies and trusts can all hold an ABN — one per entity, covering all its business activities. Haven't settled on a structure yet? Sort that first: it changes how you apply and what happens after. Our guide to choosing between sole trader, company and trust walks through the decision.

What to have ready before you apply

The application is quick if you have everything at hand. Gather:

Information	Details
Tax file number (TFN)	Yours as a sole trader. Applying without a TFN almost guarantees manual review.
Business structure	Sole trader, partnership, company or trust. Register a company with ASIC first so you have your ACN.
Identity details	Name and date of birth matching your ATO records — this is how the ABR verifies you instantly.
Business activity	Your main activity (e.g. carpentry, graphic design, cafe) and industry.
Addresses	The physical address of each place you'll operate from (a home office counts), plus a postal address.
Contact details	Phone, email, and an authorised contact person.
Associate details	For partnerships, companies and trusts: names, dates of birth and TFNs of partners, directors, shareholders or trustees.
Start date	When you expect to start trading — no more than six months ahead.

How to register your ABN, step by step

The entire process is free and online. Here's the official route:

Go to the Australian Business Register at abr.gov.au — or the Business Registration Service at register.business.gov.au to bundle other registrations in the same session (more below). Check the URL: official sites end in .gov.au. If you arrived via an ad and the site ends in .com.au, you're on a private operator's site that will charge you.
Confirm your entitlement. The application opens with questions about whether you're carrying on an enterprise. Answer honestly — this is where the employee-vs-business test applies.
Choose your entity type — sole trader, partnership, company or trust.
Enter your details — TFN, name, date of birth, business activity, addresses, contacts, plus associate details for non-sole-trader structures.
Review and submit. Mismatched details — a name that doesn't exactly match your TFN record, say — are the most common reason applications get kicked to manual review.
Record your ABN. If your identity is verified automatically, your ABN is issued immediately on screen. Save it — you'll use it on every invoice from now on. A confirmation letter follows in the mail.

That's it. No fee, no certificate to buy, no renewal — ever.

Instant issue vs manual review

Most applications are approved instantly: if your TFN matches and your details are complete and consistent, the ABN appears at the end of the online application.

If the ABR can't verify your identity automatically, or something needs a closer look, the application goes to manual review. The ABR aims to review these within 20 business days, and may contact you for supporting documents. Common triggers: no TFN provided, details that don't match ATO records, a previously cancelled ABN, or answers that raise doubt about whether you're genuinely carrying on an enterprise.

You can check progress with the ABR using your application reference number. Don't lodge a second application while the first is under review, and hold off invoicing until the number arrives — the 47% no-ABN withholding rules apply until it's issued.

Register your ABN, business name and GST in one pass

The government's Business Registration Service (register.business.gov.au) handles several registrations in one session, which beats doing them one at a time on different sites:

Registration	Cost (as at August 2026)	Notes
ABN	Free	Always free, never needs renewal
Business name (ASIC)	$47 for 1 year, $108 for 3 years	Only needed if you trade under a name other than your own legal name
GST	Free	Required once GST turnover hits $75,000
PAYG withholding	Free	Needed before you pay employees
Company registration (ACN)	ASIC fee applies — check asic.gov.au	Only if you're setting up a company

A sole trader called Jane Nguyen trading as "Jane Nguyen" needs no business name registration at all. Trading as "Coastal Bookkeeping"? That name must be registered with ASIC — done in the same sitting here, at the government rate.

If you're starting out as a sole trader, our complete sole trader guide covers what happens after the ABN arrives — tax, deductions, super and record keeping.

The paid websites and scam letters to avoid

This is the part too many guides skip, and it's where new business owners lose real money.

Paid "ABN registration" websites

Search "ABN registration" and the top results are often ads for private websites with official-looking names and coats of arms. They'll "process" your application for $50 to $100. They are not the government — they fill in the same free form you can fill in yourself, and their applications are processed no faster than yours.

The tell: official government sites end in .gov.au, and the ABN application never asks for payment. If a site wants your credit card to "register your ABN", close the tab and go to abr.gov.au. (Paying a registered tax agent or accountant to set your business up properly is a different thing entirely — you're paying for advice, not form-filling.)

Fake "renewal" letters and invoices

Once your details are public on ABN Lookup, expect mail. Scammers harvest the register and send letters styled as official invoices — demanding an "ABN renewal fee", a "registration certificate", or business name renewal at triple the real ASIC price. Remember two facts and you're bulletproof:

Your ABN never expires and never has a renewal fee. Any "ABN renewal" demand is a scam. Full stop.
Business name renewals come from ASIC only, cost $47 for one year or $108 for three (as at August 2026), and are paid on asic.gov.au. ASIC sends renewal notices about 30 days before your renewal date — anything else, or anything charging more, bin it.

Report anything dodgy to Scamwatch (scamwatch.gov.au) and warn your bookkeeper so nobody pays it by accident. Misleading conduct like this is exactly what Australian Consumer Law is designed to punish — but prevention beats a refund chase every time.

After you register

When you must register for GST

GST registration becomes compulsory once your GST turnover reaches $75,000 over a rolling 12 months — looking backward at what you've earned or forward at what you reasonably expect ($150,000 for non-profits, as at August 2026). You must register within 21 days of hitting or expecting to hit the threshold. Drive for a ride-sourcing platform or run a taxi service? You must register from dollar one, regardless of turnover.

Below the threshold, registration is optional — sometimes worthwhile for the GST credits, sometimes just extra paperwork. Once you're in, you lodge business activity statements; our BAS and GST guide explains the cycle in plain English.

ABN vs business name: know the difference

Your ABN identifies the entity; your business name is just the trading name attached to it. Registering a business name gives you no ownership rights over the name — only a trade mark does that — and one ABN can carry multiple business names.

Keep your details current

You must update your ABN details within 28 days of any change — address, email, business activity, or ceasing to trade. It's free at abr.gov.au. Banks, government agencies and emergency services all rely on ABR data, so a stale address isn't just an admin issue.

Cancelling your ABN

If you stop trading, cancel your ABN through the ABR (free, naturally). Sort your final obligations first — outstanding BAS, GST, PAYG — because cancelling the ABN cancels your GST registration with it. Restart later and you can usually reapply for the same number.

Once the ABN is sorted, get the basics working for you early: connect it to decent accounting software so invoicing and GST tracking are automatic from day one.

Key takeaways

An ABN is free at abr.gov.au or register.business.gov.au — never pay a website to register one, and never pay an "ABN renewal" fee, because ABNs don't expire.
You're only entitled to an ABN if you're genuinely carrying on an enterprise — not for work you do as an employee, no matter what an employer tells you.
Have your TFN, structure, activity and addresses ready and most applications are approved instantly; manual reviews take up to 20 business days.
The Business Registration Service bundles ABN, business name, GST and PAYG withholding in one pass — the only fee is ASIC's business name fee ($47/1 year, $108/3 years, as at August 2026).
GST registration is compulsory within 21 days of turnover reaching $75,000 (any turnover for taxi and ride-sourcing).
Update your ABN details within 28 days of any change, and cancel the ABN (free) if you stop trading.

Where to get help

Australian Business Register — apply for, update or cancel an ABN
Business Registration Service — ABN, business name, GST and more in one application
business.gov.au — plain-English registration guidance
ATO — GST, PAYG and employee-vs-contractor guidance
ASIC — business names and current fees
Scamwatch (ACCC) — report fake renewal letters and lookalike sites
Your accountant — for structure advice before you register, especially if a company or trust is on the table