What is the current GST registration threshold in Australia?

The current compulsory GST registration threshold in Australia is an annual GST turnover of $75,000 for most businesses, and $150,000 for non-profit organisations. This threshold has been consistent since its introduction, as outlined by the Australian Taxation Office (ATO). Businesses exceeding this turnover must register for GST within 21 days of crossing the threshold.

What’s the difference between an ABN, TFN and GST registration for a small business?

If you’re starting or growing a business in Australia, it’s very common to mix up an ABN, a TFN and GST registration. They’re connected, but they do different jobs — and getting them right early can help you invoice properly, deal with the ATO correctly, and avoid setup mistakes that become expensiv

Skill level: General guidance
Time: Varies
Trade: Accounting & Business Structures
Updated: 31 October 2026

Why is it important to understand ABN, TFN, and GST for Australian small businesses?

What are the key differences between an ABN, TFN, and GST registration?

An ABN identifies your business to the public and to government systems. An Australian Business Number is used on invoices, registrations and business dealings. It does not replace your personal identity for tax, and having an ABN does not automatically mean you’re registered for GST.

A TFN is your tax identity with the ATO. A sole trader usually uses their individual Tax File Number for income tax purposes, while a company, trust or partnership may have its own TFN once established. Your TFN is generally not something you put on customer-facing documents.

GST registration is a separate tax registration. Registering for GST means your business is in the GST system and may need to charge GST on taxable sales, lodge BAS statements and claim GST credits on eligible business purchases. You can have an ABN without being GST-registered, depending on your circumstances.

Your business structure affects how these pieces fit together. A sole trader, company, partnership or trust can each have different registration pathways and reporting obligations. ASIC is relevant if you’re setting up a company, while the ATO manages tax and GST registrations.

Timing matters. Some businesses need certain registrations before they start trading, hiring staff or issuing invoices. The ATO, ASIC, the Tax Practitioners Board (TPB), CPA Australia and Chartered Accountants ANZ all stress that registrations should match the real structure and activities of the business.

What does an accounting specialist review regarding ABN, TFN, and GST for a business?

Your actual business structure and whether it has been set up correctly before applying for an ABN, TFN or GST registration.

Expected turnover, type of income and clients to assess whether GST registration is required, optional or likely to become necessary soon.

Whether you are trading as a sole trader or through a separate entity such as a company or trust, which changes whose TFN is used and how tax is reported.

Your bookkeeping and invoicing setup so your ABN, GST treatment and BAS reporting are consistent from day one.

Other linked registrations such as PAYG withholding, payroll tax considerations, super obligations or business name registration where relevant.

Common Costly Mistakes

Assuming an ABN means you’re automatically registered for GST.

Using the wrong entity’s details on invoices or applications.

Registering late or too early without understanding the reporting impact.

Setting up software incorrectly, which can lead to BAS errors, poor records and avoidable ATO follow-up.

When To Get Professional Help

DIY setup can work when the structure is very simple, but it gets more complicated once you’re unsure about turnover, GST, contractors versus employees, or whether to operate as a sole trader or company. If you want the registrations to line up properly with your structure, tax reporting and bookkeeping, it’s sensible to speak with a qualified accountant or registered BAS agent early.

Talk To A Specialist

If you want clarity on what registrations your business actually needs, a short conversation can often save time and tidy up confusion before it becomes a bigger problem. You’re welcome to book a free accounting discovery call here: /finance/enquire?service=accounting

Frequently Asked Questions

Do I need an ABN to start a small business in Australia?

In many cases, yes — especially if you’re carrying on an enterprise and issuing invoices to customers. An ABN is commonly needed for business dealings and registrations, but the exact requirement depends on what you’re doing and how your business is structured. The ATO provides guidance, but a specialist can confirm how it applies to your situation.

Is an ABN the same as a TFN?

No. An ABN is a business identifier used in commercial and government contexts, while a TFN is your tax identifier with the ATO. A sole trader may have both, but they serve different purposes and should not be used interchangeably.

Can I have an ABN without registering for GST?

Yes, many businesses do. GST registration is separate from your ABN and depends on factors such as your turnover, business activities and whether registration is compulsory or voluntary. Because thresholds and rules can change, it’s worth checking current ATO guidance or confirming with an accountant.

Do sole traders use their personal TFN for business?

Generally, yes — for income tax purposes a sole trader usually reports business income through their individual tax return using their personal TFN. But they may still need a separate ABN for the business activities themselves. This is one of the key differences between sole traders and separate entities like companies.

Who handles ABN, TFN and GST registration in Australia?

The ATO is the main authority for ABN, TFN and GST registrations, while ASIC is involved if you’re establishing a company or registering a business name. If you want help applying the rules correctly, use a qualified accountant, registered BAS agent or tax practitioner listed through the Tax Practitioners Board.

Important — General Information Only

This content is general information only, not personal accounting, tax or business structures advice. It does not take into account your objectives, financial situation or needs, and you should consider your own circumstances and seek advice from a qualified accountant, registered BAS agent or registered tax practitioner before acting. For official guidance, refer to the ATO, ASIC and the Tax Practitioners Board (TPB).

Frequently asked questions

Do I need an ABN to start a small business in Australia?: In many cases, yes — especially if you’re carrying on an enterprise and issuing invoices to customers. An ABN is commonly needed for business dealings and registrations, but the exact requirement depends on what you’re doing and how your business is structured. The ATO provides guidance, but a specialist can confirm how it applies to your situation.
Is an ABN the same as a TFN?: No. An ABN is a business identifier used in commercial and government contexts, while a TFN is your tax identifier with the ATO. A sole trader may have both, but they serve different purposes and should not be used interchangeably.
Can I have an ABN without registering for GST?: Yes, many businesses do. GST registration is separate from your ABN and depends on factors such as your turnover, business activities and whether registration is compulsory or voluntary. Because thresholds and rules can change, it’s worth checking current ATO guidance or confirming with an accountant.
Do sole traders use their personal TFN for business?: Generally, yes — for income tax purposes a sole trader usually reports business income through their individual tax return using their personal TFN. But they may still need a separate ABN for the business activities themselves. This is one of the key differences between sole traders and separate entities like companies.
Who handles ABN, TFN and GST registration in Australia?: The ATO is the main authority for ABN, TFN and GST registrations, while ASIC is involved if you’re establishing a company or registering a business name. If you want help applying the rules correctly, use a qualified accountant, registered BAS agent or tax practitioner listed through the Tax Practitioners Board.
What is the current GST registration threshold in Australia?: The current compulsory GST registration threshold in Australia is an annual GST turnover of $75,000 for most businesses, and $150,000 for non-profit organisations. This threshold has been consistent since its introduction, as outlined by the Australian Taxation Office (ATO). Businesses exceeding this turnover must register for GST within 21 days of crossing the threshold.

Written by Ledger, the Accounting & Business Structures specialist at QLD.Tools.