If your business is approaching or has passed the $75,000 revenue threshold, you may be legally required to apply for GST registration with the Australian Taxation Office (ATO). Even if you haven’t reached that mark yet, voluntary GST registration can offer benefits depending on your industry and clients.

In this guide, we’ll explain who needs to register, how to apply, and how to manage your GST obligations—plus tools and tips to keep your business compliant.

What Is GST and Who Needs to Register?

GST (Goods and Services Tax) is a 10% tax added to most goods and services sold in Australia. If your business has an annual turnover of $75,000 or more ($150,000 for not-for-profits), you’re legally required to register for GST with the ATO.

You must also register if:

  • You’re a ride-share or taxi driver (regardless of income)
  • You want to claim GST credits on business purchases
  • You operate as part of a group that includes other GST-registered entities

For a detailed breakdown of GST obligations, see our article: Navigating GST for Australian Businesses.

How to Apply for GST Registration

You can register for GST through the ATO using any of the following methods:

  • Via the Australian Business Register (ABR) when applying for an ABN
  • Through the ATO Business Portal (requires myGovID)
  • Through your registered tax or BAS agent

If you’re just starting out, you can register for an ABN and GST at the same time. If you already have an ABN, you can add GST to your registration later.

Need help with registration? Taxopia provides fast, compliant business setup services. Contact us to streamline your ABN and GST registration in one go.

When Should You Register?

You must register for GST within 21 days of your business reaching or exceeding the $75,000 threshold. Failure to register on time can result in ATO penalties and backdated GST liability.

If you’re unsure whether you’ll cross the threshold soon, you can register voluntarily. This allows you to:

  • Claim GST credits for purchases
  • Improve business credibility with corporate clients
  • Avoid needing to back-pay GST later

How to Calculate and Pay GST

Once registered, you’ll need to add 10% GST to most of your taxable sales and issue compliant tax invoices. You’ll also need to lodge a Business Activity Statement (BAS), typically quarterly, to report GST collected and claim GST paid on business expenses.

To help you work out how much GST you should charge or claim, use our online GST Calculator.

Also read: How to Calculate GST in Australia

Do You Need a GST Agent or Accountant?

While you can apply for GST registration yourself, many business owners prefer to work with a tax agent or accountant to ensure all setup steps are correct—including ABN, business name, and tax registration.

At Taxopia, we offer GST registration assistance as part of our company setup and BAS lodgement services.

GST Registration FAQs

  • How long does GST registration take? Usually 1–2 business days when completed online.
  • Can I cancel GST later? Yes, if your turnover drops below the threshold or you close the business.
  • Do I need to register for GST as a sole trader? Yes, if you meet the threshold or work in a GST-required industry (like rideshare).

Final Thoughts: Stay Compliant, Stay Ahead

Registering for GST is an essential part of running a compliant and professional business in Australia. Whether you’re a sole trader, start-up, or established business approaching the threshold, it pays to get GST registration right from the start.

Use our tools and resources to make your GST journey easier: