GST Registration Requirements for Australian Small Businesses: When You Must Register

Goods and Services Tax (GST) is a 10% tax on most goods and services supplied in Australia. As a business owner, you may be required to register for GST, collect it from customers, report it to the ATO, and remit it — or claim credits for GST you have paid on business purchases.

Missing your GST registration obligation is one of the more common compliance failures for growing small businesses — and the ATO will impose penalties and interest when they find it.

When Must You Register for GST?

You must register for GST if your business has a Goods and Services Tax turnover of $75,000 or more. This threshold applies annually — not monthly or quarterly.

Your GST turnover is your gross income from sales to which GST applies, before deducting any expenses. It does not include:

• GST collected
• Input-taxed sales (e.g., financial supplies, residential rent)
• Sale of capital assets in certain circumstances

The Threshold Is Forward-Looking

You must register when you reasonably expect your turnover to reach $75,000 in the next 12 months, not just when you have reached it. If you sign a contract in January that will generate $90,000 in revenue over the next year, you need to register now — not after you have actually received the $90,000.

Similarly, you must register within 21 days if your actual turnover in the previous 12 months exceeded $75,000.

Lower Thresholds for Specific Situations

Certain activities require GST registration regardless of your turnover:

• Taxi and ride-sourcing services (e.g., Uber, DiDi): you must register for GST regardless of turnover if you provide taxi or ride-sourcing services
• Non-resident businesses providing certain taxable supplies in Australia may have different rules

Voluntary Registration Below the Threshold

If your turnover is below $75,000, you may choose to register for GST voluntarily. Reasons to do so include:

• Your customers are GST-registered businesses who can claim credits — being registered makes your prices more competitive on a net basis
• You have significant business purchases and want to claim GST credits
• You anticipate crossing the threshold soon

If you register voluntarily, you must comply with all GST obligations as if registration were mandatory.

How to Register for GST

You register for GST through the ATO, typically at the same time as you register your business (through the Australian Business Register). You will need an Australian Business Number (ABN) to register for GST.

Once registered, the ATO will notify you of your reporting period — monthly, quarterly, or annually — based on your turnover. Most small businesses report quarterly via Business Activity Statements (BAS).

If you are a new business, you can register online at business.gov.au or through a tax agent.

What Does GST Registration Require You to Do?

Once registered, your obligations include:

Charging GST on Taxable Supplies

You must add 10% GST to the price of most goods and services you supply. This is not a cost to your business — you collect it on behalf of the government.

Issuing Tax Invoices

If a GST-registered customer requests a tax invoice for a purchase over $82.50 (including GST), you must provide one within 28 days. A tax invoice must include:

• The words "tax invoice"
• Your identity and ABN
• The date of issue
• A description of the goods or services
• The GST amount payable (or a statement that the price includes GST and the GST content)

Claiming GST Credits

You can claim credits for GST paid on your business purchases (called "input tax credits"). This reduces your net GST liability.

You can only claim credits for purchases that relate to your business activities — not private or exempt purchases.

Lodging BAS and Remitting GST

Your Business Activity Statement (BAS) is how you report and pay (or receive a refund for) GST. BAS lodgement is typically quarterly for small businesses, with deadlines falling 28 days after the end of each quarter (plus 2 days for electronic lodgement).

Standard BAS due dates:

| Quarter | Period | Due Date | | ------- | ------- | ----------- | | Q1 | Jul–Sep | 28 October | | Q2 | Oct–Dec | 28 February | | Q3 | Jan–Mar | 28 April | | Q4 | Apr–Jun | 28 July |

If you use a tax agent, extended deadlines may apply.

GST-Free and Input-Taxed Supplies

Not all supplies attract GST. Understanding the distinction is important for correct BAS reporting.

GST-Free Supplies

These include:

• Basic food (fresh fruit, vegetables, bread, milk — not restaurant meals or packaged snacks)
• Most medical, health, and dental services
• Most educational courses
• Exports of goods and services

You do not charge GST on GST-free supplies, but you can still claim input tax credits for GST you pay on related purchases.

Input-Taxed Supplies

These include:

• Financial supplies (lending money, insurance)
• Residential rent and residential property sales
• Some precious metals

You do not charge GST on input-taxed supplies, and you cannot claim input tax credits for purchases related to making those supplies.

Common GST Mistakes

1. Late Registration

Businesses that exceed the $75,000 threshold and fail to register in time must back-pay GST (from when they should have been registered), plus penalties and interest. The penalty for not registering can be as high as 75% of the shortfall in GST remitted.

2. Claiming Credits for Private Use

Claiming input tax credits for purchases that are partly or wholly private is a common error. You can only claim credits for the business-use proportion of mixed-use purchases.

3. Incorrect Tax Invoice Handling

Failing to issue compliant tax invoices — or not keeping copies of tax invoices you receive — can result in input tax credit claims being disallowed.

4. GST on Property Transactions

GST rules for property are complex. Selling commercial property generally attracts GST; selling residential property generally does not. The going concern exemption and the margin scheme add further complexity. If you are involved in property transactions, get specialist advice.

5. Ride-Sourcing Without Registration

Uber and similar platforms report driver earnings to the ATO. If you drive for a ride-sourcing platform without being registered for GST, the ATO will find out and will apply back-dated GST obligations with penalties.

The ATO's Data-Matching Approach

The ATO uses extensive data matching to identify businesses that should be registered for GST but are not. Data sources include:

• State and territory business licensing registrations
• Land titles registrations
• Credit card and merchant facility data
• Third-party platform data (eBay, Airbnb, ride-sourcing apps)
• Single Touch Payroll data showing wages that suggest significant business activity

If the ATO identifies that your turnover has exceeded the threshold without registration, they can back-date your GST registration and require you to remit GST for the period you should have been registered, plus penalties and interest.

Cancelling GST Registration

If your turnover falls below $75,000 and you are not voluntarily registered, you can cancel your GST registration. You must cancel registration if your turnover falls below $75,000 and you are not voluntarily registered, though you can choose to remain registered.

To cancel, notify the ATO. Cancellation takes effect from the end of the tax period in which you cancelled.

How Reguladar Helps

GST registration and BAS lodgement deadlines are time-sensitive obligations that recur throughout the year. Reguladar tracks your BAS due dates, alerts you before each deadline, and surfaces other ATO obligations alongside your GST requirements — in one dashboard.

As your business grows and your turnover approaches the $75,000 threshold, Reguladar can flag when your registration obligation is approaching, so you do not miss the 21-day registration window.

Stay on top of your GST and ATO obligations. Start your free compliance check at Reguladar and get clarity on your complete tax compliance picture today.