GST Calculator — Add or Remove 10% GST, Bulk + BAS
Remove GST from a tax-inclusive total, add GST when quoting, or convert between GST-inclusive and exclusive prices. Run bulk GST across invoice lines and estimate your quarterly BAS position to see whether you owe the ATO or are due a refund.
GST details
Before you enter amounts
GST is Goods and Services Tax
GST Calculation
Start with a GST-inclusive amount. We'll remove the GST.
GST Summary
Remove GST from a GST-inclusive amount.
Price excluding GST
$0
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. Sole traders, contractors, ride-sourcing drivers, and small businesses are the most common users — anyone who needs to add GST to a quote, strip it out of a receipt, or reconcile GST for a BAS.
GST on common amounts
Pre-computed GST and inclusive totals for amounts you commonly see when quoting or reconciling invoices, calculated at the 10% GST rate.
| GST-exclusive (ex GST) | GST (10%) | GST-inclusive (in GST) |
|---|---|---|
| $100 | $10 | $110 |
| $250 | $25 | $275 |
| $500 | $50 | $550 |
| $1,000 | $100 | $1,100 |
| $2,000 | $200 | $2,200 |
| $5,000 | $500 | $5,500 |
| $10,000 | $1,000 | $11,000 |
Three Ways to Use This Tool
Remove GST
Enter a GST-inclusive amount to find the exclusive price and the GST component. Handy when checking receipts or supplier invoices.
Add GST
Enter a GST-exclusive amount and see the inclusive total. Useful when quoting prices to customers or preparing 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. If you operate as a contractor or sole trader, see the contractor calculator to model income and tax once you cross the GST threshold.
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. Contractors quoting GST-exclusive rates should also weigh whether they're genuinely self-employed for tax purposes — see our contractor vs employee tax guide. Once you know your net GST position, estimate your annual income tax with the tax return calculator.
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) in Australia is a 10% tax on most goods, services, and other items sold or consumed in the country, introduced on 1 July 2000 and administered by the ATO. Some categories are GST-free (basic fresh food, medical and education services, exports) and others are input-taxed (residential rent, most financial supplies). GST-registered businesses charge 10% on taxable sales, claim credits for the GST they pay on business purchases, and report the net amount to the ATO each Business Activity Statement (BAS) period.
How do I add GST to a price?
To add GST to a GST-exclusive amount, multiply it by 1.1; to find just the GST portion, multiply by 0.1. For example, $1,000 × 1.1 = $1,100 including GST, of which $100 is GST. This is the calculation you use when quoting a customer or preparing a tax invoice — the Add GST mode does it for a single figure, and bulk mode adds GST across multiple invoice lines at once.
How do I remove GST from a price or total?
To remove GST from a GST-inclusive total, divide it by 11 to find the GST component, or by 1.1 to find the GST-exclusive price. For example, an invoice of $110 including GST contains $10 of GST and $100.00 before GST; a $1,000 inclusive total contains about $90.91 of GST and $909.09 before GST. The same two divisors work for any amount — handy when reconciling supplier invoices or working out input tax credits for your BAS.
How much GST do I pay on $1,000?
Whether $1,000 carries $100 or $90.91 of GST depends on whether the figure already includes GST. If $1,000 is GST-exclusive (a pre-tax quote), the GST is $1,000 × 10% = $100, making the total $1,100. If $1,000 is already GST-inclusive (a receipt), the GST inside it is $1,000 ÷ 11 ≈ $90.91 and the exclusive amount is $909.09. Multiply a pre-tax figure by 1.1 to add GST, or divide a total by 11 to find the GST within it.
Do I need to register for GST?
You must register for GST once your business GST turnover (gross income minus GST) reaches $75,000 or more per year. Below $75,000 registration is optional, but voluntarily registering lets you claim input tax credits on business purchases. Once registered, you charge GST on all taxable sales, lodge a BAS at the cycle the ATO assigns you, and generally stay registered for at least 12 months even if your turnover later falls below the threshold.
Do Uber and ride-sourcing drivers need to register for GST?
Yes. Ride-sourcing drivers (Uber, DiDi, Ola, Bolt) and taxi operators must register for GST from their first trip, regardless of turnover — the $75,000 threshold that applies to most businesses does not apply to them. That means charging GST on every fare, claiming credits on eligible expenses such as fuel and platform service fees, and lodging a BAS. To find the GST inside a fare you have already collected, divide the fare by 11; the result is the GST to set aside for the ATO.
What's the difference between GST-free and input-taxed supplies?
GST-free and input-taxed supplies are both non-taxable sales, but they differ in how credits work. GST-free supplies — basic fresh food, medical and educational services, childcare, and most exports — sit under Division 38 of the GST Act: you do not charge GST, but you can still claim credits on related business purchases. Input-taxed supplies — residential rent and most financial supplies such as loans and bank fees — sit under Division 40: you do not charge GST and generally cannot claim credits on purchases used to make those supplies. Misclassifying a supply on your BAS can lead to under-claimed or over-claimed credits.
What is a BAS and how does GST relate to it?
A Business Activity Statement (BAS) is the form GST-registered businesses lodge with the ATO, usually quarterly. Its GST section reports total GST collected on sales (labels G1 and 1A) and total GST credits claimed on purchases (G11 and 1B); the difference is your net GST position. If you collected more than you paid you remit the difference to the ATO, and if you paid more — common for capital-intensive or export businesses — the ATO refunds you. The BAS Position helper estimates this net figure once you enter both totals.
How often do I need to lodge a BAS?
Most small businesses lodge a BAS quarterly, around the 28th of the month after each quarter ends. Businesses with high GST turnover are required to report monthly, while voluntarily-registered businesses below the registration threshold can choose to report annually with their tax return. The ATO assigns your lodgement cycle when you register, and you can confirm it in ATO Online Services or on your most recent BAS.
Can I claim GST credits on business purchases?
If you are registered for GST, you can claim input tax credits for the GST included in the price of goods and services bought for business use. You generally need a valid tax invoice from the supplier, particularly for purchases above the ATO's tax invoice threshold, and credits are reported at labels G11 and 1B on your BAS. Keep your tax invoices for at least five years in case of an ATO review.
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