You’ve spent years mastering your clinical craft. But while you were getting better at providing care, no one taught you how to register a business, choose an entity structure, or work out whether you've crossed the GST threshold. Each of these tasks may seem like an admin issue for the future, but the moment you decide to open your own practice, each of these questions will land squarely on your desk, and the answers shape what your business will look like for the foreseeable future. 

ABN registration sits at the centre of it. It feels like a quick form to fill out. But the choices you make here ripple through your tax obligations, your eligibility to bill Medicare and the National Disability Insurance Scheme (NDIS), and your ability to employ a team down the track. Get the structure right early, and you build a practice that scales. Get it wrong, and you face costly rework later.

This guide walks you through each step, in plain language, so the business side feels as considered as your clinical work. Let's start with the foundation: what an ABN actually is.

What is an ABN and as an Allied Health practitioner, does my private practice need one? 

An Australian Business Number (ABN) is a unique 11-digit identifier that marks your practice as a recognised business for tax and invoicing purposes [4]. When you bill a client, claim through Medicare, or submit an invoice to an NDIS participant, your ABN tells the Australian Taxation Office (ATO) and everyone you deal with that you're operating a legitimate business.

If you are an Allied Health practitioner in private practice, you have to get an ABN.  If you don’t have an ABN, any business that pays you must withhold 47% of your payment under the "no ABN withholding" rule [3]. The lack of an ABN also means you cannot issue compliant tax invoices, which most practices, NDIS providers, and clients will expect.

Do I need an ABN if I earn less than $75,000 a year in my private practice?

Yes, you need an ABN the moment you start operating a business, regardless of income. The $75,000 figure relates to Goods and Services Tax (GST) registration, not your ABN. 

GST registration becomes compulsory once your annual turnover reaches $75,000 [3]. Below that threshold, you still need an ABN, but GST registration is optional. 

Does my business structure affect my ABN registration? 

Yes, your business structure shapes how you register your ABN, how you're taxed, how exposed you are to liability, and how easily you can grow. There are four main options for Allied Health practitioners setting up their private practice.

Sole Trader

This is the simplest and cheapest structure to set up. You operate under your own TFN with an ABN attached to you personally. You keep all the profit, your tax is straightforward, and the administrative burden is low. The catch is liability. There's no legal separation between you and the business, so your personal assets are exposed if something goes wrong. This is usually the starting place for most solo physiotherapists, occupational therapists, and speech pathologists.

Partnership

This is when two or more people run a practice together, share income, losses, and control. A partnership has its own ABN and TFN, and lodges a partnership tax return, though each partner pays tax on their share at their individual rate. It suits clinicians going into practice together. But each partner can be liable for the others' business debts, so a solid partnership agreement matters.

Company

This is a separate legal entity with its own ABN and Australian Company Number (ACN). The company pays tax at the company rate (25% for base rate entities), and your personal assets are generally protected because liability sits with the company. The trade-off is cost and administration: setup fees, annual Australian Securities and Investments Commission (ASIC) review fees, and stricter reporting. A company structure is the common choice for practices ready to scale.

Trust

A trust holds business assets and income for beneficiaries, often used with a corporate trustee. It can offer asset protection and flexible income distribution, which appeals to practitioners with family or tax-planning considerations. It's the most complex and costly to run, so it usually makes sense only if you have a clear reason to do so with the help of professional advice. 

How do you apply for an ABN as an Allied Health practitioner? 

Here’s a step-by-step guide:
You apply for an ABN through the Australian Business Register (ABR) at abr.gov.au. Registration is free, and many applications are approved instantly. If the ATO needs to review your details, it can take up to 20 business days.

Here’s what you'll need before you start

• Your TFN (and the TFNs of any associates or partners)
• Your chosen business structure
• A description of your business activity, for example "physiotherapy services" or "speech pathology"
• Your professional registration details, such as your Australian Health Practitioner Regulation Agency (AHPRA) number
• Your business contact and address details
• The date you want your ABN to start

Complete your ABN application in 4 easy steps 

1. Go to the ABR website and select "Apply for an ABN."
2. Confirm your entitlement. You must be carrying on or starting a business in Australia [4].
3. Enter your structure, identity, and activity details.
4. Review and submit.

If you get approved instantly, you'll receive your 11-digit ABN on screen. The ATO pathway through your myGov-linked business account works similarly once you're set up.

Is your ABN application delayed? Here’s what might be wrong

Mismatched names or TFN details are the most frequent cause of delay, so check that the details you enter match ATO records exactly.

Was your ABN application refused? Here’s what to do next

If your application is refused, the ABR sends a refusal letter explaining why. You have 28 days to request a review, or you can correct the issue and reapply.

The 80% personal services income rule for Allied Health practitioners who operate as sole traders

The 80% rule is part of the ATO's personal services income (PSI) rules. If 80% or more of your income in a financial year comes from one client or payer, such as a single practice or one NDIS provider, the ATO may treat your earnings as personal services income. That classification limits the deductions you can claim and restricts how you structure your tax, even if you hold an ABN.

This matters for Allied Health practitioners working as contractors or subcontractors. A speech pathologist who subcontracts almost entirely to one practice, or an occupational therapist whose income comes from a single NDIS provider, can easily cross the 80% line without realising it. If you get this rule wrong at the start of the year, it may be too late to fix things when tax time rolls around. 

How do I check if I cross the 80% personal services income rule as an Allied Health practitioner? 

The ATO offers a PSI decision tool that walks you through whether the rules apply. If 80% or more of your income comes from one source, you'll generally need to pass the "results test". This test looks at whether you're paid for a result, supply your own tools, and fix defects at your own cost. PSI doesn't stop you operating, but your deductions are limited, so factor it into your pricing and planning. Also, whenever in doubt, always talk to an accountant who works with Allied Health.

Can I employ staff as a sole trader?

Yes, a sole trader can legally employ staff in Australia. Your ABN structure doesn't stop you from building a team. What changes is the set of obligations that come with being an employer.

Once you hire, you'll need to:

• Register for Pay As You Go (PAYG) withholding so you can deduct tax from wages
• Pay superannuation guarantee contributions, currently 12% of ordinary time earnings
• Take out workers' compensation insurance in your state or territory
• Meet Fair Work obligations, including the correct modern award, pay rates, and record-keeping

This is manageable for one or two employees. As the team grows, the liability you carry as a sole trader, often signals it's time to consider a company structure. Especially because your personal assets sit behind the business. If you're planning to hire, factor that decision into your structure now rather than having to restructure mid-growth.

Is my ABN on myGov?

Yes, you can access your ABN through myGov once it's linked to the ATO and, for businesses, through ATO Online services for business. Your ABN details, registration status, and linked tax obligations all sit there.

For a public check, use the free ABN Lookup tool at abr.business.gov.au. Enter an ABN or business name to confirm a practice is registered, see its GST status, and verify trading names. Clients, NDIS providers, and other businesses use this to check you're legitimate, so it's worth searching your own ABN to confirm everything reads correctly.

How do I ensure my ABN details are accurate and current? 

You're legally required to keep your ABN details current and to update them within 28 days of any change [3]. That includes a new business structure, an added trading name, a change of address, or a change to your contact details. Update through the ABR or your linked ATO account. Out-of-date details can disrupt payments and create compliance headaches, so make this a quick annual check.

I’ve got an ABN. What are the next steps for me to launch my practice? 

Once you have your ABN set up, we recommend going through this handy checklist to build out a practice that's legally ready to open its doors, take bookings, and bill with confidence.

1. Register a business name: If you trade under anything other than your own name, register the business name with ASIC. It costs $44 for one year or $102 for three years, and you can only register it once you have your ABN [2].
2. *Register for GST: Once your turnover will reach $75,000, register for GST through the ABR or your ATO account. Many Allied Health services are GST-free, but you still need to register and report, so check which of your services qualify.
3. Arrange professional indemnity and public liability insurance: AHPRA requires registered practitioners to hold professional indemnity cover. Public liability protects you if a client is injured on your premises. Sort both before you see a single client.
4. Confirm your AHPRA registration is current:  Your registration must be active and unrestricted to practise and to bill.
5. Apply for a Medicare provider number: If you'll deliver services under Medicare, such as Chronic Disease Management plans, apply through Services Australia. You can use your ABN for Medicare and NDIS billing once you're registered.
6. Consider NDIS registration: Decide whether you'll work as a registered or unregistered NDIS provider. Registration involves an audit but opens you to NDIA-managed participants.
7. Open a dedicated business bank account: Keep business income and expenses separate from your personal finances. It makes BAS, tax, and bookkeeping far cleaner, and it's required if you operate as a company.

I’m ready to open my practice, what else do I need to get started? 

Sorting out your ABN, business structure, tax obligations, and insurance is the groundwork that lets you focus on what comes next: a full calendar, a team you trust, and a practice that grows on your terms.

Once the legal foundations are set, your next move is the operational side. That's where splose comes in. We help Allied Health practitioners run scheduling, billing, and client records with ease, so the business side feels as considered as your clinical work. Book a demo to see how we can integrate seamlessly into your practice. We’ll even let you take all of our features for a spin for 14 days with no-obligation. 

Sources: 

[2] The Allied Health Business Compliance Checklist - Nacre Consulting — https://www.nacre.com.au/blog-the-allied-health-business-compliance-checklist

[3] Register for an Australian Business Number | business.gov.au — https://business.gov.au/registrations/register-for-an-australian-business-number-abn

[4] Applying for an ABN - Australian Business Register — https://www.abr.gov.au/business-super-funds-charities/applying-abn

Disclaimer: This article contains general information only and should not be considered accounting, taxation or financial advice. Business owners should seek advice from their accountant, bookkeeper or financial adviser regarding their specific circumstances.