GST Calculator Australia
Add GST, remove GST, or calculate the GST component of any amount.
Enter an amount and choose what you want to calculate. Australian GST is generally 10% on taxable sales and services.
Enter the pre-tax wholesale or supply cost to calculate customer invoice price with 10% GST.
$100.00 GST has been added to the $1,000.00 ex-GST amount, giving a total customer price of $1,100.00.
Pricing a product or service?
Don't stop at tax arithmetic. Connect your GST amount directly to your commercial profit targets and margin models.
Selling Price Calculator
Calculate a customer price from your costs and target margin.
Margin Calculator
Check how much profit you're making after direct costs.
Discount Calculator
Add discounts on top of your wholesale cost without eroding profit.
Quick Australian GST Examples
Standard commercial lookup reference table for common Australian business transactions.
| Ex-GST Amount | 10% GST Amount | Total (Incl. GST) | Rule / Shortcut |
|---|---|---|---|
| $50.00 | $5.00 | $55.00 | Multiply by 1.10 |
| $100.00 | $10.00 | $110.00 | Multiply by 1.10 |
| $250.00 | $25.00 | $275.00 | Multiply by 1.10 |
| $500.00 | $50.00 | $550.00 | Multiply by 1.10 |
| $1,000.00 | $100.00 | $1,100.00 | Multiply by 1.10 |
| $2,500.00 | $250.00 | $2,750.00 | Multiply by 1.10 |
| $5,000.00 | $500.00 | $5,500.00 | Multiply by 1.10 |
| $10,000.00 | $1,000.00 | $11,000.00 | Multiply by 1.10 |
To add 10% GST: Multiply an ex-GST amount by 1.10 (or multiply by 0.10 to find GST alone).
To remove GST: Divide a GST-inclusive amount by 1.10.
Divide any GST-inclusive figure by 11 to instantly isolate the exact GST component ($1,100 / 11 = $100).
How the Calculation Works
Statutory Australian Taxation Office (ATO) arithmetic formulas for Goods and Services Tax.
Calculates the full invoice price owed by the client, including 10% statutory GST.
Determines only the isolated GST dollar figure to remit on your BAS statement.
Unpacks a total gross receipt to find your net business revenue before tax was added.
The statutory formula: e.g. $1,100 ÷ 11 = $100 GST component.
Important Statutory Clarification & Non-Advisory Notice
This calculator performs GST arithmetic only. It does not determine whether a specific sale is taxable, GST-free (such as certain basic foodstuffs, medical services, or exports) or input-taxed (such as financial supplies or residential rent), nor does it evaluate whether your enterprise meets the statutory $75,000 annual turnover threshold for mandatory GST registration. For official rulings, classification schedules, and registration requirements, consult the Australian Taxation Office (ATO) guidance at ato.gov.au or a registered BAS agent.
Related Australian Business Calculators
Continue exploring the BizCalc suite to protect your margins and refine pricing.
Build GST into your customer price and protect your margin target.
Calculate profit margin before and after GST adjustments.
See how much dollar gross profit remains after direct production costs.
Calculate discounts before or after GST without eroding bottom-line profit.
Frequently Asked Questions
Essential Australian GST guidance and accounting considerations.
1. What is the GST rate in Australia?
The standard Goods and Services Tax (GST) rate in Australia is 10%. It was introduced on 1 July 2000 under A New Tax System (Goods and Services Tax) Act 1999 and applies to most goods, services, and other items sold or consumed in Australia.
2. How do I add GST to a price?
To add GST to a pre-tax amount, multiply the ex-GST figure by 1.10. For example, if an item costs $100 ex-GST: $100 × 1.10 = $110 GST-inclusive customer price. Alternatively, calculate 10% by multiplying by 0.10 and adding that $10 to your base price.
3. How do I remove GST from a total?
To remove GST from a total invoice or retail price, divide the GST-inclusive figure by 1.10. For example, if a receipt total is $550: $550 ÷ 1.10 = $500 ex-GST.
4. How do I calculate the GST component of a GST-inclusive price?
Use the statutory Rule of 11: divide the GST-inclusive total by 11. For example, in a total charge of $1,100: $1,100 ÷ 11 = $100 GST component (representing exactly 9.09% of the overall gross figure).
5. Should GST be included when calculating profit margin?
No. GST collected is a statutory remittance owed to the Australian Taxation Office (ATO), not commercial revenue belonging to your enterprise. Margin and markup calculations must strictly always be performed on ex-GST figures to avoid severely overstating operational profitability.
6. What is the difference between GST-inclusive and GST-exclusive?
GST-exclusive (Ex-GST) represents the net commercial revenue retained by the seller for the good or service. GST-inclusive (Inc-GST) is the final total figure payable by the customer at the checkout or invoice settlement, which bundles the 10% statutory tax collected on behalf of the Commonwealth Government.