GST Calculator — Find, Add or Remove 10% GST

Find the GST in any amount, or add and remove GST.

Enter any amount to find the GST component, convert between GST-inclusive and exclusive prices, or calculate GST in bulk. Check your quarterly BAS GST position to see if you owe the ATO or are due a refund.

GST Calculator

The entered amount already includes GST — we’ll strip it out.

Amount

GST Removed

Price (ex GST)

GST component: $0

Ex GST: $0
GST (10%): $0
In GST: $0

How the GST Calculator Works

What Is GST?

The Goods and Services Tax (GST) is a 10% tax on most goods, services, and other items sold or consumed in Australia. If you run a business with a turnover of $75,000 or more, you must register for GST, charge it on your sales, and lodge Business Activity Statements (BAS) with the ATO. This calculator helps you convert prices and estimate your BAS position.

Three Ways to Use This Tool

Add GST

Enter a GST-exclusive amount and see the inclusive total. Useful when quoting prices to customers or preparing invoices.

Remove GST

Enter a GST-inclusive amount to find the exclusive price and the GST component. Handy when checking receipts or supplier invoices.

Bulk Mode

Enter multiple amounts at once (comma or line-separated) to calculate GST on a batch of items with running totals.

BAS Position

Enter the GST you collected on sales and the GST you paid on purchases to see your net BAS position — amount owing or refund due.

Quick GST Formulas

Add GST: Price × 1.1 = GST-inclusive amount
Find GST in a total: Total ÷ 11 = GST component
Remove GST: Total ÷ 1.1 = GST-exclusive price

GST Registration and BAS

When must you register for GST?

You must register if your business GST turnover is $75,000 or more per year, or if you provide taxi or ride-sourcing services. You can voluntarily register below the threshold, which lets you claim input tax credits on business purchases.

How BAS GST reporting works

Each BAS period (usually quarterly), you report the total GST collected on your sales and the total GST paid on your business purchases. If you collected more than you paid, you remit the difference to the ATO. If you paid more (common for capital-intensive purchases or export businesses), the ATO refunds you.

Simplified estimate

This calculator provides quick GST conversions and a BAS position estimate. It does not replace accounting software or professional advice for complex BAS lodgement scenarios involving instalments, PAYG withholding, or fuel tax credits.

Frequently Asked Questions

What is the GST rate in Australia?

The Goods and Services Tax (GST) rate in Australia is 10%. It applies to most goods, services, and items sold or consumed in Australia. Some items like fresh food, health services, and education are GST-free.

How do I calculate GST from a total (inclusive) amount?

To remove GST from an inclusive amount, divide the total by 11. For example, if the total is $110, the GST component is $110 ÷ 11 = $10, and the GST-exclusive price is $100. This calculator does this automatically.

How do I add GST to a price?

To add GST, multiply the GST-exclusive amount by 1.1 (or by 0.1 to find just the GST component). For example, $100 × 1.1 = $110 inclusive of GST.

When do I need to register for GST?

You must register for GST if your business has a GST turnover (gross income minus GST) of $75,000 or more per year. You can choose to register voluntarily below this threshold. Ride-sourcing drivers and taxi operators must register regardless of turnover.

What is a BAS and how does GST relate to it?

A Business Activity Statement (BAS) is a form you lodge with the ATO, typically quarterly. It reports your GST collected on sales and GST paid on business purchases. The difference determines whether you owe the ATO or receive a refund. This calculator's BAS position feature helps you estimate that net amount.

What items are GST-free in Australia?

Common GST-free items include most basic food (fresh fruit, vegetables, bread, meat, milk), medical and health services, some education courses, childcare, exports, and certain charitable activities. These are defined under Division 38 of the GST Act.

How often do I need to lodge a BAS?

Most small businesses lodge BAS quarterly (every three months). If your GST turnover is $20 million or more, you must lodge monthly. Some businesses can choose to lodge annually if they voluntarily registered for GST.

Can I claim GST credits on business purchases?

Yes, if you’re registered for GST you can claim credits (input tax credits) for GST included in the price of goods and services you buy for your business. You’ll need a valid tax invoice to claim. The BAS position section of this calculator helps estimate your net position after credits.

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