Business Registration
ABN & GST
Understand how ABN and GST decisions fit into business setup, tax administration, and invoicing workflows.
Overview
ABN & GST explained
ABN and GST are two distinct registrations that often get bundled together, and understanding how they relate keeps your tax admin clean. An ABN identifies your business; GST is a tax registration that changes how you invoice and report.
You need an ABN first, because GST registration sits on top of it. GST is generally required once your annual turnover reaches $75,000, but many businesses choose to register earlier so they can claim credits and present complete tax invoices.
Cockatoo helps you connect these ABN and GST decisions to your invoicing and reporting, so the two work together rather than tripping you up at tax time.
What to check
Key points
- An ABN identifies your business; GST is a separate tax registration on top of it.
- You must have an ABN before you can register for GST.
- GST is generally mandatory at $75,000 turnover, or $150,000 for non-profits.
- Registering for GST changes your invoices and adds Business Activity Statements.
Before you start
What you'll need
- An ABN already in place, or applied for, before considering GST.
- A realistic estimate of your annual turnover.
- An understanding of how GST affects your pricing and invoices.
- A simple system for tracking GST collected and GST paid.
- Awareness of your reporting cycle for Business Activity Statements.
Process
How it works
- Obtain your ABN so the business is identified for tax purposes.
- Estimate turnover to judge whether GST registration is required or worthwhile.
- Register for GST when you reach the threshold or choose to register early.
- Update invoices to show GST and the words tax invoice where required.
- Schedule your Business Activity Statements to report GST on time.
Avoid these
Common mistakes
- Thinking an ABN automatically registers you for GST, when they are separate.
- Waiting too long to register for GST after passing the turnover threshold.
- Issuing tax invoices without GST set up, or vice versa, and confusing clients.
- Forgetting to set aside collected GST, then struggling to pay it at BAS time.
Common questions
ABN & GST FAQs
How do ABN and GST decisions fit together?
An ABN comes first and identifies your business; GST is a separate registration that sits on top of the ABN. You decide on GST based on turnover and whether claiming credits suits you. Together they shape how you invoice and report to the ATO.
Do I need an ABN to register for GST?
Yes. An ABN is a prerequisite for GST registration, so you obtain the ABN first. Many businesses apply for both at the same time when they expect to cross the GST threshold, which keeps the two registrations aligned from the outset.
When does GST become mandatory?
GST registration is generally required once your annual turnover reaches $75,000, or $150,000 for non-profit organisations. You can also register voluntarily below the threshold, which lets you claim GST credits but means charging GST and lodging activity statements.
How does GST change my invoicing?
Once registered, you charge GST on taxable sales and issue tax invoices showing the GST amount. You can also claim credits for GST paid on business purchases. The net is reported and paid through your Business Activity Statement each cycle.
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