How is GST calculated in Australia?

GST in Australia is calculated at 10% of the GST-exclusive price. To add GST to a price, multiply by 1.1. To remove GST from a GST-inclusive price, divide by 1.1 to get the GST-exclusive amount.

How do I calculate GST from a total price?

To calculate the GST amount from a GST-inclusive total price, divide the total by 11. For example, if an item costs $110 including GST, the GST component is $110 ÷ 11 = $10.

What is the difference between GST-inclusive and GST-exclusive prices?

A GST-exclusive price is the price before GST is added. A GST-inclusive price is the total price including GST. For example, if an item costs $100 before GST, the GST-inclusive price would be $110.

Do all businesses need to charge GST in Australia?

Only businesses with an annual turnover of $75,000 or more (or $150,000 for non-profit organizations) are required to register for GST and charge it on their taxable supplies. Businesses below this threshold can choose to register voluntarily.

Australian GST Calculator

Free online tool to calculate GST for your business transactions. Add GST, remove GST, or calculate GST amount with a single click.

Use Calculator Now Learn About GST

Free GST Calculator

Calculate GST amounts instantly for your business

Before GST

After GST

Only GST

Calculate the GST-inclusive (after GST price) and GST amount from a GST-exclusive (before GST) amount.

Enter Amount Before GST ($)

Amount Before GST:

$0.00

GST Amount (10%):

$0.00

Amount After GST:
$0.00

Calculate the GST-exclusive (before GST price) and GST amount from a GST-inclusive (after GST) amount.

Enter Amount After GST ($)

Amount Before GST:
$0.00

GST Amount (10%):

$0.00

Amount After GST:

$0.00

Calculate the GST-exclusive (before GST price) and GST-inclusive (after GST) from GST amount only.

Enter GST Amount Only ($)

Amount Before GST:

$0.00

GST Amount (10%):
$0.00

Amount After GST:

$0.00

Understanding GST in Australia

Essential information about Goods and Services Tax for Australian businesses

What is GST?

Goods and Services Tax (GST) is a broad-based tax of 10% on most goods, services, and other items sold or consumed in Australia. It was introduced on July 1, 2000, as part of the Howard Government's tax reform package.

GST is collected by businesses at each stage of the supply chain and is ultimately paid by the final consumer. Businesses can generally claim credits for the GST they pay on business purchases.

GST Registration Requirements

You must register for GST if:

Your business or enterprise has a GST turnover of $75,000 or more
Your non-profit organization has a GST turnover of $150,000 or more
You provide taxi travel or ride-sourcing services, regardless of turnover

You can choose to register voluntarily even if your turnover is below these thresholds.

How to Calculate GST

There are three main GST calculations you may need to perform:

Adding GST to a price: Multiply the GST-exclusive price by 1.1
Removing GST from a price: Divide the GST-inclusive price by 1.1
Finding the GST component: Divide the GST-inclusive price by 11

Our calculator above automates these calculations for you.

GST-Free and Input-Taxed Items

Some goods and services are GST-free, including:

Most basic food items
Most medical and health services
Most educational courses
Exports

Other supplies are input-taxed, such as financial services and residential rent, meaning no GST is included in the price, but the supplier cannot claim GST credits.

GST and BAS Lodgement

If you're registered for GST, you must report and pay the GST collected (minus GST credits) to the ATO through your Business Activity Statement (BAS).

Depending on your business size, you may need to lodge your BAS:

Quarterly (most common)
Monthly (if your GST turnover is $20 million or more)
Annually (if eligible)

myBAS simplifies this entire process by automatically calculating your GST obligations and preparing your BAS lodgement.

Record-Keeping Requirements

For GST purposes, you must keep:

Tax invoices for purchases over $82.50 (including GST)
Records of all sales and purchases where GST applies
Records of how you calculated GST amounts

These records must be kept for at least 5 years and be in English (or easily translatable).

GST Calculation Formulas

Quick reference for common GST calculations

Calculation Type	Formula	Example
Add GST to a price	Price × 1.1	$100 × 1.1 = $110
Remove GST from a price	Price ÷ 1.1	$110 ÷ 1.1 = $100
Calculate GST amount from GST-inclusive price	Price ÷ 11	$110 ÷ 11 = $10
Calculate GST amount from GST-exclusive price	Price × 0.1	$100 × 0.1 = $10
Calculate GST-inclusive price from GST amount	GST amount × 11	$10 × 11 = $110
Calculate GST-exclusive price from GST amount	GST amount × 10	$10 × 10 = $100

GST and Your Business Activity Statement (BAS)

How GST calculations affect your BAS lodgement

Business Activity Statement form with GST fields

Key GST Fields on Your BAS

G1: Total sales (including GST)
G2: Export sales
G3: Other GST-free sales
G10: Capital purchases (including GST)
G11: Non-capital purchases (including GST)
1A: GST on sales (calculated as (G1 - G2 - G3) ÷ 11)
1B: GST on purchases (calculated as (G10 + G11) ÷ 11)

How myBAS Helps with GST Reporting

myBAS automates the entire GST calculation and reporting process:

Categorizes transactions correctly for GST reporting
Automatically calculates GST collected and GST credits
Prepares BAS-ready reports with pre-filled figures
Provides alerts for common GST mistakes
Simplifies the quarterly BAS lodgement process

Ready to simplify your GST and BAS reporting?

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