GST Guide for Small Businesses
Complete guide to GST registration, returns, schemes, and practical tips for managing GST as a small business owner in 2026.
Complete guide to GST registration, returns, schemes, and practical tips for managing GST as a small business owner in 2026.
The first question most small business owners ask is whether they need to register for GST. The answer depends on your annual turnover and the nature of your business.
Current GST Threshold (2025-26):
You must register for GST if your turnover exceeds A$75,000 in any 12-month period.
If your annual turnover exceeds the A$75,000 threshold, GST registration is mandatory. You must notify ATO within 30 days of the month in which you exceed the threshold. Failure to register can result in penalties.
You can voluntarily register for GST even if your turnover is below the threshold. This might be beneficial if you make mostly GST-free supplies, as you'll be able to reclaim GST on inputs while charging customers at 0%.
Registering for GST with ATO is straightforward. Here's the process:
Collect your Medicare Levy number, business details, business bank account information, and accounting records showing your turnover.
Visit the ATO website and complete the online GST registration form. You'll need a myGovID and ABN linked to Online Services for Business.
Double-check your business details, GST reporting cycle (monthly, quarterly or annual), and contact information before submitting.
ATO will issue you a GST registration number (usually within 4 weeks). This can then be used on your invoices.
From your effective date of registration, you must charge GST on taxable supplies and keep digital records.
ATO offers several GST schemes designed to simplify accounting and reduce compliance burden for small businesses. Choosing the right scheme can save you money and time.
This is the default scheme for all GST-registered businesses. You charge GST on each transaction and reclaim GST on inputs.
Best for: Businesses with complex transactions and significant input GST to recover.
Instead of calculating GST on each transaction, you pay a fixed percentage of your gross turnover to ATO. You don't reclaim input GST on business expenses.
Best for: Service businesses and retailers with turnover up to A$150,000.
You only pay GST when you receive payment from customers, rather than when you invoice. This improves cash flow for businesses with slow-paying clients.
Best for: Businesses with credit customers and irregular cash flow.
Instead of submitting quarterly BAS (Business Activity Statement), you submit just one return per year. Monthly or quarterly payments on account may be required.
Best for: Busy business owners who want to minimize accounting tasks.
ATO's Single Touch Payroll (STP) initiative requires most GST-registered businesses to keep records digitally and submit BAS (Business Activity Statement) using compatible software.
1. Gather Your Data: Compile all invoices issued, invoices received, and expense documentation for the quarter.
2. Use Software: Input your data into STP-compatible accounting software (QuickBooks, FreeAgent, Xero, etc.).
3. Review Figures: Check your GST due, input GST reclaimed, and net GST payable or refund due.
4. Submit Return: Submit your BAS (Business Activity Statement) to ATO electronically via the STP platform before the deadline.
5. Settle Payment: Pay any GST owed to ATO within the specified timeframe (typically 7 days after filing).
Important Deadline Information:
BAS (Business Activity Statement) are typically due 1 month and 7 days after the end of your GST period. Missing deadlines can result in penalties of up to 5% of GST due.
Understanding common GST pitfalls can help you stay compliant and avoid costly errors:
You cannot claim GST input tax credits on personal or private expenses. Only business expenses qualify for input tax credit recovery.
Confusing net and gross figures can lead to significant calculation errors. Use our calculator to avoid mistakes when working with multiple invoices.
Forgetting to claim back GST (input tax credits) on business expenses costs you money. Keep all invoices and ensure you claim all eligible input tax credits.
ATO imposes penalties for late filing and payment. File and pay on time to avoid penalties ranging from $222 (or $1,110 for SGEs) per failure to lodge unit, plus the General Interest Charge on unpaid GST.
Charging GST on GST-free supplies (like food) is an error. Ensure you understand what items are GST-free to avoid this costly mistake.
ATO requires 6 years of records. Disorganized or lost records can trigger audits. Use digital systems to maintain clear audit trails.
Reverse Charge GST is a special mechanism that changes who is responsible for paying GST in certain circumstances. It's particularly important if your business buys construction services or services from EU suppliers.
When you receive construction services from a sub-contractor, reverse charge GST applies. Instead of the contractor charging you GST, you (the buyer) account for the GST on your own return.
Example: A builder provides construction services worth A$1,200 (net). Under reverse charge:
Our Reverse GST Calculator helps you quickly extract the exact GST amount from construction invoices when reverse charge applies.
Use Reverse GST CalculatorCommon questions from small business owners about GST
No, GST registration is not required if your turnover is below A$75,000. However, you can choose to register voluntarily, which may benefit your business if you supply mostly GST-free items or want to appear more professional.
Most GST-registered businesses file quarterly (every 3 months). However, you can opt for the Annual GST Reporting, which allows you to file just one return per year, or monthly filing if your business requires more frequent submissions.
The Simplified BAS allows eligible small businesses to pay GST as a fixed percentage of turnover (typically 9-16.5% depending on sector) rather than calculating GST on individual transactions. You don't reclaim input GST, but the scheme often results in lower GST liability, especially for service businesses.
STP is ATO's initiative requiring GST-registered businesses to keep records digitally and submit BAS (Business Activity Statement) using compatible software rather than manually entering figures on the ATO website. This improves accuracy and compliance while streamlining the filing process.
You can reclaim GST on most business expenses, but not all. You cannot claim GST on private expenses, car purchases (only fuel), or supplies that are GST-exempt (such as insurance or education). Keep proper invoices showing GST for all claimable expenses.
Official sources: ATO: GST