GST Calculator Australia 2025: Complete Guide to 10% GST Tax
Everything Australian businesses need to know about calculating, reporting, and managing GST. Includes free calculator and practical examples.
What is GST in Australia?
GST (Goods and Services Tax) is a broad-based tax of 10% on most goods, services, and other items sold or consumed in Australia.
Introduced on 1 July 2000, GST is collected by businesses on behalf of the Australian Taxation Office (ATO) and remitted through Business Activity Statements (BAS).
As a registered business, you charge GST on your sales (output tax) and can claim back GST on your business purchases (input tax credits).
When Do You Need to Register for GST?
GST registration is:
- Your business turnover is $75,000 or more per year
- Your non-profit organization turnover is $150,000 or more per year
- You provide taxi or ride-sharing services (regardless of turnover)
- Your turnover is below the threshold
- You want to claim input tax credits on business purchases
You must register within 21 days of becoming aware you need to register. Late registration can result in penalties.
How to Calculate GST (Step-by-Step)
Formula 1: Add GST
To add 10% GST to a price:
GST Inclusive Price = Original Price × 1.1Example: $100 + GST = $100 × 1.1 = $110
Formula 2: Calculate GST Amount
To find how much GST is in a GST-inclusive price:
GST Amount = GST Inclusive Price ÷ 11Example: GST in $110 = $110 ÷ 11 = $10
Formula 3: Remove GST
To remove GST from a GST-inclusive price:
GST Exclusive Price = GST Inclusive Price ÷ 1.1Example: $110 excluding GST = $110 ÷ 1.1 = $100
Frequently Asked Questions
What is GST in Australia?
GST (Goods and Services Tax) is a 10% tax on most goods and services sold or consumed in Australia. Introduced in 2000, it's collected by businesses and remitted to the ATO.
Do I need to register for GST?
You must register for GST if your business turnover is $75,000 or more ($150,000 for non-profit organizations). You can voluntarily register below these thresholds.
How do I calculate GST on a price?
To add GST: multiply by 1.1. To calculate GST amount: multiply by 10% (or divide by 11 from GST-inclusive price). To remove GST: divide by 1.1.
What items are GST-free in Australia?
GST-free items include most basic food, some education courses, some health services, some childcare, some religious services, and exports.