What You Need to Know About Australia Sales Tax (GST)

Australia keeps its sales tax simple compared to many countries: a flat 10% GST on most goods and services, administered entirely by the ATO. Once your annual turnover crosses $75,000, registration is compulsory and you will be lodging a Business Activity Statement every quarter. This post explains how GST works, what qualifies as GST-free, and how to claim your input tax credits correctly.

1. What is GST?

GST is a broad-based consumption tax of 10% applied to most goods, services, and other items sold or consumed in Australia. It is administered by the Australian Taxation Office (ATO).

GST applies to most transactions, but some items are GST-free or input-taxed:

GST-free items: Most basic food, some education courses, some medical and health services, exports, and some childcare services
Input-taxed items: Financial supplies (loans, shares), residential rent, and the sale of existing residential premises

Businesses collect GST from customers and can claim credits for GST included in the price of their own business purchases.

2. Who does it apply to?

This usually applies to:

Businesses with an annual GST turnover of $75,000 or more (mandatory registration)
Non-profit organisations with an annual GST turnover of $150,000 or more
Businesses that voluntarily register for GST (even if below the threshold)
Taxi and ride-sharing drivers (must register regardless of turnover)
Non-resident businesses selling to Australian consumers (digital products and low-value imported goods)

3. Why does it matter?

Understanding GST helps you:

Stay compliant with the ATO and avoid penalties
Avoid interest charges on late BAS lodgements and payments
Keep proper records of all taxable supplies and GST credits
File and pay correctly through your Business Activity Statement (BAS)
Plan your cash flow better by setting aside collected GST

4. How does it work?

Here's the basic process:

Register for GST with the ATO when your GST turnover reaches $75,000 (or voluntarily before that)
Charge 10% GST on your taxable sales
Issue tax invoices for sales of $82.50 or more (including GST)
Keep records of GST collected on sales (output tax) and GST paid on purchases (input tax credits)
Lodge your BAS with the ATO (monthly or quarterly)
Pay the difference between GST collected and GST credits claimed, or receive a refund if your credits exceed your collections

5. What forms are involved?

BAS (Business Activity Statement) - The main form used to report and pay GST, PAYG instalments, PAYG withholding, and other tax obligations. Lodged monthly or quarterly with the ATO
GST Registration Form - Completed through the Australian Business Register (ABR) when registering for GST
Tax Invoice - Required for all taxable sales of $82.50 or more. Must include your ABN, GST amount, and other prescribed details
Adjustment Notes - Issued when changes occur after a tax invoice has been provided (for example, returns or corrections)

6. What information do you need?

Before handling GST, make sure you have:

Your Australian Business Number (ABN)
Records of all taxable sales and the GST collected
Records of all business purchases and the GST paid
Tax invoices for purchases over $82.50 (to claim input tax credits)
Details of any GST-free or input-taxed supplies
BAS lodgement schedule (monthly or quarterly)
Access to the ATO Business Portal or myGov account

7. Important deadlines

Filing frequency: Quarterly (most small businesses) or monthly (if GST turnover exceeds $20 million, or by choice)
Quarterly BAS deadline: Due 28 days after the end of each quarter. Quarter 2 (October to December) has a special deadline of 28 February
Monthly BAS deadline: Due on the 21st of the following month
Registration deadline: Within 21 days of your GST turnover reaching $75,000

Quarterly BAS due dates for 2025-26:

Q1 (July-September): 28 October
Q2 (October-December): 28 February
Q3 (January-March): 28 April
Q4 (April-June): 28 July

8. Common mistakes to avoid

Missing the $75,000 registration threshold and not registering on time
Claiming GST credits without a valid tax invoice
Incorrectly claiming GST credits on private or exempt purchases
Not accounting for the GST on employee fringe benefits
Forgetting to account for GST on imported services and digital products
Lodging BAS late and incurring failure-to-lodge penalties
Not reporting all cash sales and other income

9. Simple example

You run a graphic design business in Sydney and invoice a client $5,000 plus GST.

You charge 10% GST: $5,000 x 10% = $500
Your total invoice is $5,500
During the same quarter, you spend $2,000 plus GST on business expenses (software, supplies)
GST on expenses (your input tax credit): $2,000 x 10% = $200
Net GST owing: $500 (collected) - $200 (credits) = $300
You pay $300 to the ATO with your quarterly BAS

10. FAQ

Q: Do I have to register for GST? A: You must register if your annual GST turnover is $75,000 or more ($150,000 for non-profits). You can register voluntarily below these thresholds if you choose.

Q: What is a tax invoice and when do I need one? A: A tax invoice is a document that includes your ABN, the GST amount, and other details. You need to issue one for any taxable sale of $82.50 or more (GST inclusive). You need to receive one to claim input tax credits on your BAS.

Q: Can I claim GST credits on all business purchases? A: You can claim credits for GST included in the price of most business-related purchases. However, you cannot claim credits on input-taxed supplies, private expenses, or purchases without a valid tax invoice.

Q: What is the difference between GST-free and input-taxed? A: GST-free supplies have no GST charged, but you can still claim input tax credits on related purchases. Input-taxed supplies also have no GST charged, but you cannot claim input tax credits on related purchases.

Q: What happens if I lodge my BAS late? A: The ATO can charge a failure-to-lodge penalty of $313 for each 28-day period the BAS is overdue, up to a maximum of 5 periods ($1,565). Interest is also charged on any unpaid GST.

11. Final takeaway

Australian GST is a flat 10% on most goods and services. Register with the ATO when your turnover hits $75,000, lodge your BAS on time (quarterly or monthly), and keep valid tax invoices to claim your input tax credits.

Caption

What you need to know about Australia sales tax (GST): Register when your turnover reaches $75,000, charge 10% on most goods and services, and lodge your BAS quarterly or monthly with the ATO.

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