Do I add 10% or divide by 11?

To add GST, multiply the base amount by 0.1 (or use 1.1 to find the total). To extract GST from a total (inclusive) price, divide the total amount by 11. This calculator handles both instantly.

Is it always 10% in Australia?

Yes, since its introduction in 2000, the Goods and Services Tax (GST) in Australia has been set at a flat rate of 10% for most taxable goods and services.

What is an input tax credit?

If you are registered for GST, you can generally claim back the GST you pay on business-related purchases as an 'input tax credit' in your Business Activity Statement (BAS).

GST Calculator

Add or extract Goods and Services Tax (GST) instantly with ATO-compliant precision. Australia's faster, smarter GST tool for 2026.

Instant GST Calculator

Quickly add GST to a price or extract it from a GST-inclusive total.

For more complex business filings, use our Full BAS Calculator.

Waiting for Input

Enter a price to instantly see the GST breakdown and total amounts.

Quick Rule of Thumb

To find the GST in a price, just divide by 11. To add GST, just multiply by 1.1 or use this tool for precision.

ATO Guidance

Understanding GST in Australia

The Goods and Services Tax (GST) is a broad-based tax of 10% on most goods, services, and other items sold or consumed in Australia. Most businesses must register for GST when their turnover reaches $75,000.

Inclusive vs Exclusive

GST-inclusive prices already contain the 10% tax. Exclusive prices require the tax to be added.

Business Activity Statement

Registered businesses report GST collected vs GST spent through quarterly or monthly BAS filings.

GST Credits

Businesses can claim 'input tax credits' for the GST paid on business-related expenses.

GST-Free
Items?

Not everything has GST. Most basic food, some medical services, and certain education courses are GST-free. Ensure your bookkeeping accounts for these variations to maximize your BAS accuracy.

View Detailed BAS Guide

Calculations Verified

Based on official ATO GST Calculation Rules

Last System Audit

March 31, 2026

Expert Methodology

How We Calculate GST

This tool uses the standard 10% Goods and Services Tax (GST) rate as legislated in Australia. It accurately handles both 'Add GST' (Inclusive = Base × 1.1) and 'Extract GST' (GST = Total / 11) formulas.

Disclaimer:This tool provides estimates for educational purposes only. It is not financial advice. While we strive for 100% accuracy, individual circumstances such as tax-free status or specific BAS requirements may affect your final figures. Always consult with a registered tax agent.

Accurate & Authoritative

Our calculations are based on the latest tax legislation from the Australian Taxation Office (ATO) and other relevant government sources.

ATO Tax Rates
We use the official income tax brackets, Medicare levy rates, and HELP/HECS repayment thresholds for the selected financial year.
Services Australia
Child Care Subsidy (CCS) and Family Tax Benefit (FTB) calculations are aligned with the income tests and payment rates provided by Services Australia.
Fair Work Ombudsman
Minimum pay rates in our Fair Work Pay Rate Checker are based on the latest award information published by the Fair Work Ombudsman.

GST & Tax FAQ

Answers to specific questions about this tool.

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