Goods & Services Tax
GST Calculator — Add or Remove 10% GST, Bulk + BAS
Enter any amount to find the GST component, convert between GST-inclusive and exclusive prices, or run bulk GST on invoice lines. Estimate your quarterly BAS GST 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 subtract GST.
GST Summary
Subtract 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. This calculator helps you convert prices and estimate your BAS position.
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
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. 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.
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 10%, introduced on 1 July 2000 and administered by the ATO. It applies to most taxable goods, services, and other items sold or consumed in Australia. Some categories are GST-free (basic fresh food, medical and education services, exports) and others are input-taxed (residential rent, most financial supplies). Businesses registered for GST charge it on taxable sales, claim credits for GST paid on business inputs, and report the net amount to the ATO each Business Activity Statement (BAS) period.
How much GST do I pay on $1,000?
It depends on whether the $1,000 figure is GST-exclusive or GST-inclusive. If $1,000 is the GST-exclusive price (a quote before tax), the GST is $1,000 × 10% = $100, making the GST-inclusive total $1,100. If $1,000 is already GST-inclusive (a receipt), the GST component is $1,000 ÷ 11 ≈ $90.91 and the GST-exclusive amount is $909.09. The same logic scales to any amount: divide a total by 11 to find the GST inside it, or multiply a pre-tax amount by 1.1 to add GST.
How do I calculate GST from a total (inclusive) amount?
To find the GST component of a GST-inclusive total, divide the total by 11. For example, a receipt showing $110 including GST contains $110 ÷ 11 = $10 of GST, and the GST-exclusive price is $100.00. For a larger amount like $1,000 inclusive, the GST is $1,000 ÷ 11 ≈ $90.91 and the exclusive figure is $909.09. Switch the calculator to Subtract GST mode to do this for any figure — handy when reconciling supplier invoices for your BAS or calculating input tax credits.
How do I add GST to a price?
To add GST to a GST-exclusive amount, multiply by 1.1 (or by 0.1 to find just the GST component). For example, $1,000 × 1.1 = $1,100 including GST, and the GST itself is $100. Switch the calculator to Add GST mode for any figure, or use bulk mode to add GST to multiple invoice lines at once. This is the step you take when quoting a customer or preparing a tax invoice.
Do I need to register for GST if I earn under $75,000?
If your business GST turnover (gross income minus GST) is under $75,000 per year, you are not required to register — but you can choose to voluntarily register so you can claim input tax credits on business purchases. Ride-sourcing drivers (Uber, DiDi, Ola, Bolt) and taxi operators must register from their first trip, regardless of turnover. Once registered, you must charge GST on all taxable sales, lodge BAS at the frequency the ATO assigns you, and generally stay registered for at least 12 months even if your turnover later falls below the threshold.
What's the difference between GST-free and input-taxed supplies?
Both are non-taxable, but the credit treatment differs. GST-free supplies (basic fresh food, medical and educational services, childcare, most exports) sit under Division 38 of the GST Act — you do not charge GST on the sale, but you can still claim GST credits on related business purchases. Input-taxed supplies (residential rent, most financial supplies like loans and bank fees, precious metals after the first sale) sit under Division 40 — you also do not charge GST, but you generally cannot claim GST credits on purchases used to make those supplies. Getting this distinction wrong on your BAS may lead to under-claimed credits or credits you are not entitled to.
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 — typically quarterly, sometimes monthly or annually. The GST section of your BAS 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 that amount to the ATO; if you paid more (common for capital-intensive purchases or export businesses), the ATO refunds the difference. The calculator's 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 BAS quarterly — every three months, due around the 28th of the month following the end of each quarter. Larger businesses with high GST turnover are required to lodge monthly. Voluntarily-registered businesses below the registration threshold can choose to lodge annually with their tax return. The ATO assigns your lodgement cycle when you register; you can check your current cycle in ATO Online Services or on your most recent BAS.
Can I claim GST credits on business purchases?
Yes — if you are registered for GST, you can claim input tax credits for the GST included in the price of goods and services you buy for business use. To claim, you generally need a valid tax invoice from the supplier, particularly for purchases above the ATO's tax invoice threshold. Credits are claimed at labels G11 and 1B on your BAS, and the net effect appears in the BAS Position section of this calculator once you enter both GST collected and GST paid. Keep tax invoices for at least five years for ATO audit purposes.
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