When do I need to register for GST in Australia?

GST registration in Australia is mandatory once your business reaches certain turnover thresholds. Understanding these thresholds and when the obligation kicks in is critical to avoiding penalties from the Australian Taxation Office (ATO).

The $75,000 threshold: what counts and what does not

Your GST turnover includes the total sales of goods and services that are connected with Australia and that would be subject to GST. This is your gross business income, not your profit. It includes: - All taxable sales (goods and services with 10% GST) - GST-free sales (such as fresh food, exports, and certain health and educational services) - Sales to overseas customers

It does not include: - Input-taxed sales (bank interest, residential rent, financial supplies) - Payments that are not actually income (capital asset sales in some cases) - Wages or salary income if you are an employee

For non-profit organisations, the threshold is $150,000. Taxi and ride-share drivers (including Uber, DiDi, Ola) must register for GST regardless of their turnover level.

Current and projected turnover: the two tests

The ATO uses two turnover tests:

Current GST turnover: If your GST turnover in the current month plus the previous 11 months is $75,000 or more, you must register.

Projected GST turnover: If you reasonably expect your GST turnover to reach $75,000 or more in the next 12 months, you must register. This applies when starting a new business with strong early growth.

You must register within 21 days of first becoming aware that you are required to register. If you fail to register on time, the ATO can backdate your registration and require you to remit GST on all taxable sales from the date you should have registered, even though you did not collect it from customers. This is a significant financial risk.

Voluntary registration below $75,000

Businesses with turnover below $75,000 can voluntarily register for GST. This is often advantageous when: - Your customers are GST-registered businesses that can claim input tax credits on the GST you charge them - You make significant GST-inclusive purchases for your business and want to claim input tax credits - You want to appear more established in a B2B market

Voluntary registration is less attractive if you sell primarily to consumers, since adding 10% GST either raises your prices or reduces your margin.

What happens after registration

Once registered, you must: - Add GST to your prices (or absorb it into existing prices) - Issue tax invoices for sales over $82.50 (GST-inclusive) - Lodge Business Activity Statements (BAS) either monthly or quarterly - Remit the GST you collected to the ATO, less any input tax credits you are entitled to claim - Keep accurate records of all GST transactions

Input tax credits

A key benefit of GST registration is the ability to claim input tax credits (ITCs) for the GST included in your business purchases. For example, if you purchase $110 of office supplies (including $10 GST), you can claim a $10 ITC that reduces your GST liability. To claim ITCs, you need a valid tax invoice from your supplier.

Cancelling GST registration

If your GST turnover falls below $75,000 and stays there, you can apply to cancel your GST registration. You cannot cancel if you are required to be registered (i.e., turnover remains above the threshold). If you voluntarily registered, you generally must remain registered for at least 12 months.

Penalties and interest

Failing to register when required can result in the ATO backdating your registration to when you should have registered, requiring you to pay GST on past sales that you did not collect, and charging a failure-to-lodge penalty and general interest charges on overdue amounts. The ATO uses data-matching capabilities to identify unregistered businesses, including by cross-referencing bank data, business name registrations, and industry reporting.