When Do You Need to Register for GST? A Guide for Australian Business Owners
If you're running a growing business, whether it's a side hustle starting to gain traction or an established operation pushing toward the $1M mark, GST registration is one of those compliance questions that catches people off guard.
Miss the trigger point and you're backdating returns and backdating payments to the ATO. Get it right and you've got a clean, compliant business with no nasty surprises.
Here's what you need to know.
The $75,000 Threshold: the Part Most People Get Wrong
The GST registration threshold in Australia is $75,000 in annual turnover (called GST Turnover). For non-profits, it's $150,000.
But here's where business owners get tripped up: it's not just about what you've already invoiced. The threshold applies in two scenarios:
You've already invoiced $75,000 or more in the current financial year, OR
You project that you will invoice $75,000 or more in the next 12 months (your current month plus the following 11)
That second point is the one that catches people.
Example: You've been invoicing $5,000 a month, well under the threshold. Then you land a big client and your monthly invoicing jumps to $10,000. At that rate, your projected 12-month turnover is $120,000. You must register for GST from that first $10,000 month, not when you actually cross $75,000 in cumulative invoicing.
One Exception: Taxi and Rideshare Drivers
If you drive for Uber, DiDi, or any other rideshare or taxi platform, you must register for GST from day one, regardless of turnover. There's no threshold for this category.
What Happens If You Register Late?
If you miss the trigger point, you'll need to backdate your GST registration to when you should have registered. That means calculating and paying the GST you should have collected from that date.
The good news: you can also backdate GST credits on your eligible business purchases for the same period, which reduces the net amount you owe. It's still a painful and time-consuming exercise, which is why tracking your turnover monthly from the start matters.
Should You Register Early, Even If You Don't Have To?
This is where strategy comes in. The right answer depends on who your customers are.
If You Sell Primarily to Other Businesses (B2B)
Register as soon as you can. When your customers are GST-registered businesses, they can claim the GST back anyway. It doesn't cost them anything extra. And once you're registered, you can claim GST credits on all your own business purchases.
Example: You invoice a client $1,000 + $100 GST = $1,100. They claim the $100 back. Net cost to them: $1,000. You then claim back the $50 GST on $550 of stock you purchased. Everyone wins.
This is particularly relevant for businesses in professional services, wholesale, trade, or any B2B model, exactly the kind of established businesses working with a CFO advisory practice.
If You Sell Primarily to Consumers (B2C)
Hold off registering as long as legally possible. Consumers can't claim GST back, so adding 10% to your prices puts you at a genuine price disadvantage against competitors who aren't yet registered.
Example: An unregistered hairdresser charges $80 for a haircut. A registered competitor charging the same net amount needs to invoice $88. To a consumer, that $8 difference is real money, and it goes straight to the ATO, not your pocket.
Practical Tips for Staying on Top of It
Track your revenue monthly. You need to know where you stand relative to the $75,000 threshold at all times.
Run a 12-month projection regularly. If your business is growing, a single good month can change your obligations.
Use cloud accounting software. We recommend Xero, but there are other cloud solutions. They make it straightforward to monitor invoicing totals and flag when you're approaching the threshold.
Don't wait until tax time to find out you're overdue. Backdating GST is avoidable with basic financial visibility.
The Bigger Picture
GST compliance is one layer of running a financially healthy business. But knowing your numbers, what you're invoicing, what your projections look like, where your margins sit, is what separates business owners who are always reacting from those who are in control.
If your business is growing and you're not sure whether your financial systems are keeping pace, that's worth a conversation.
This article contains general information only and does not constitute tax or legal advice. Every business situation is different. Speak with us or another registered tax agent or accountant to understand your specific obligations.
