Adding GST to a Quote
A web designer quotes $5,000 for a project (GST-exclusive).
GST: $5,000 × 10% = $500. GST-inclusive total: $5,500. The invoice should show: Subtotal $5,000 + GST $500 = Total $5,500.
GST Calculator
Add 10% GST to a price, take it out of a GST-inclusive price, or find just the GST part, for invoices, quotes and your BAS.
Updated October 2026Built and checked by MaverickHow it's calculatedReport an error
Your numbers
Updates as you typeGST breakdown
GST component
$100
10% effective rate
Ex-GST amount
$1,000
net of GST
Inc-GST total
$1,100
invoice total
Registration
Registered
Status confirmed
Where the GST sits
Useful for tax invoices: the GST line must be clearly separated for amounts over $82.50.
Ex-GST90.9%
GST9.1%
GST on common invoice sizes
Standard 10% rate. To find GST in a GST-inclusive price, divide by 11.
10% GST applies. Quick math: to add GST, multiply by 1.1. To remove GST, divide by 1.1. To find GST in an inclusive price, divide by 11. Registration is mandatory at $75k annual turnover.
How it works
GST is a 10% tax on most goods and services sold in Australia. Most of the time you need one of three sums: adding GST to a price, taking it out of a price that already includes it, or finding just the GST part for an invoice or your BAS. This does all three.
- 1Enter the dollar amount.
- 2Choose your calculation type: add GST, remove GST, or find GST only.
- 3Indicate your GST registration status.
- 4Optionally select the supply type (some items are GST-free).
- 5Get instant results with a breakdown.
Worked examples
Finding GST in a Receipt
A business owner buys office supplies for $330 (GST-inclusive) and needs to know the GST for their BAS.
GST component: $330 ÷ 11 = $30. GST-exclusive amount: $300. The $30 is claimable as an input tax credit on the next BAS.
Questions people ask
- Do I need to register for GST?
- You must register if your annual turnover is $75,000 or more ($150,000 for non-profits), or if you provide taxi/ride-sharing services regardless of turnover. You can voluntarily register below these thresholds. Registration is through the ATO via your ABN.
- What items are GST-free?
- Major GST-free categories: most basic food (fresh fruit, vegetables, bread, meat, milk), medical and health services, education courses, childcare, exports, water/sewerage, some financial services. Prepared food, confectionery, soft drinks, and restaurant meals do include GST.
- How do I lodge my BAS?
- BAS (Business Activity Statement) is lodged quarterly or monthly through myGov/ATO Online, your accountant, or approved software (Xero, MYOB, QuickBooks). Quarterly BAS is due 28 days after the quarter ends. Monthly lodgement is available if you prefer more regular processing.
The terms, in plain English
- GST
- Goods and Services Tax: a 10% broad-based consumption tax on most goods, services, and other items sold or consumed in Australia.
- Input Tax Credit
- The GST included in the price of business purchases. GST-registered businesses can claim these credits on their BAS, effectively recovering the GST paid on business expenses.
- Tax Invoice
- A document issued by a GST-registered supplier showing the price, GST amount, supplier's ABN, and other required details. Required for purchases over $82.50 to claim input credits.
- BAS (Business Activity Statement)
- A form submitted to the ATO (quarterly or monthly) reporting GST collected, GST paid, PAYG withholding, and PAYG instalments.