Running a business is exciting until tax time rolls around.
Suddenly, all the receipts, invoices, and income reports you’ve been avoiding come back to haunt you. And if your business is edging closer to that $75,000 turnover mark, there’s one thing you can’t afford to ignore: GST registration.
It’s not just about ticking a box; it’s about staying compliant, avoiding penalties, and making sure your business is operating above board. Yet, many business owners wait too long, hoping they won’t cross the line.
The reality? You might already have, and the ATO doesn’t take kindly to late registrations.

What Is GST and Who Needs to Register?
The Goods and Services Tax (GST) is a 10% tax added to most goods and services sold in Australia. Not every business is required to register, but if your GST turnover hits $75,000 or more in a 12-month period (or if you expect it to) you must register within 21 days. For non-profits, the threshold is $150,000.
There are also specific cases where registration is mandatory, no matter your turnover. For example:
- If you provide rideshare or taxi services
- If you want to claim fuel tax credits
- If your organisation receives income as part of a monetisation agreement (such as advertising revenue from a digital platform)
These aren’t optional checkboxes—they’re firm legal requirements.
“I Haven’t Hit the Threshold Yet, So I Don’t Need to Worry”, Right?
Not quite.
Many small business owners believe they can wait until their income consistently exceeds $75,000 before taking action. However, if you reasonably expect to hit the threshold in the first year of trading, you’re also required to register.
For example, if you’ve launched a business and early indicators suggest your turnover will exceed the threshold in the next few months, the ATO expects you to act now, not later. Waiting until the end of the financial year to register can leave you open to penalties and backdated GST liabilities.
What Happens If You Don’t Register When You Should?
Let’s consider a scenario.
You’re a sole trader selling handmade furniture online. Business has been strong, and over the past year, your turnover hit $85,000—but you never registered for GST because you didn’t realise the requirement applied to you. Months later, the ATO contacts you.

Now, you may be required to pay GST on past sales, even if you never charged your customers for it. That means you could owe thousands out of your own pocket. Add in potential interest and penalties, and the impact can be significant.
It’s not just a paperwork issue; it’s a financial risk.
How to Register for GST (It’s Simpler Than You Think)
To register for GST, you first need to have an Australian Business Number (ABN). Once you have that in place, there are a few ways to register:
- Through the ATO’s Online Services for Business
- By contacting your registered tax or BAS agent
- Over the phone with the ATO
- Or by submitting a paper form
Once registered, you’ll start lodging a Business Activity Statement (BAS) regularly, typically quarterly or monthly. This helps you keep track of GST collected and paid, and it also allows you to claim GST credits on business-related purchases.
What If You No Longer Need to Be Registered?
Business circumstances change. If your income drops below the threshold, and you’re not required to be registered for another reason (such as providing rideshare services), you can cancel your GST registration.
However, you need to do this formally, you can’t simply stop lodging BAS or assume the ATO will close it for you.
When to Monitor Your GST Turnover
If you’re not registered yet, but close to the threshold, you should be reviewing your turnover monthly. This includes looking at:
- Your current turnover over the past 12 months
- Your projected turnover over the next 12 months

If either of those figures reaches $75,000 (or $150,000 for non-profits), it’s time to act. Keep in mind that turnover refers to your gross income, not your profit, and doesn’t include GST itself.
Final Thoughts: Don’t Let GST Catch You Off Guard
Too often, small business owners delay registering for GST until it becomes a problem. It’s not uncommon to think, “I’ll deal with it later,” only to be caught out when the ATO comes knocking. But the reality is, registering early, once required, is far less costly than dealing with the consequences of ignoring it.
Whether you’re a freelancer, an e-commerce seller, or a sole trader offering services, knowing when to register and following through can save you from a financial headache later on.
If you’re unsure whether GST applies to your situation or you’re uncertain about how to approach registration, it’s always worth speaking with an accountant. A brief conversation could clarify your obligations and protect your business from costly mistakes.
So, is your business registered for GST? Or are you putting it off and hoping for the best?
If you’d like assistance registering or reviewing your GST obligations, our team is here to help. Feel free to get in touch and let’s make sure your business stays on the right track.
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