GST Calculator: Add or Remove 10% GST
Goods and Services Tax (GST) is a 10% tax on most goods and services sold in Australia. Businesses registered for GST must charge 10% on taxable supplies and can claim credits for GST on business purchases. Use this calculator to quickly add GST to a price or extract GST from an inclusive amount.
FAQ
Q1: When do I need to register for GST?
You must register for GST if your annual turnover is $75,000 or more (or $150,000 for non-profits). If you're below the threshold, registration is optional. Once registered, you must charge GST on taxable supplies, lodge Business Activity Statements (BAS), and can claim GST credits.
Q2: How do I calculate GST manually?
To add GST: Amount × 1.10 = GST-inclusive total. GST amount = Amount × 0.10. To extract GST from an inclusive price: GST = Total × (10/110) = Total × 0.090909... Base = Total × (100/110) = Total × 0.90909...
Q3: Are all goods and services subject to GST?
No. GST-free items include basic food, education, health services, exports, and some charities' activities. Input-taxed sales include financial services and residential rent (no GST charged, but also can't claim credits). Understand your supply type to comply with BAS reporting.
Tip: Keep accurate records of all GST credits (tax invoices) for at least 5 years. Use accounting software (Xero, QuickBooks) to automate BAS preparation.