Trusted by Australian Businesses
GST Calculator Australia
Add or Remove GST
In Seconds
Last updated: July 2026 · Reviewed against ATO guidance
Working out GST doesn’t need to be complicated. This free, online GST calculator lets you add GST, remove GST, or check the exact GST amount in seconds. Whether you’re pricing an invoice, checking a receipt, or running the numbers for your business, this calculator gives you accurate results every time based on current ATO GST rules.
Australian Smart Calculator to Add or Remove GST.
GST in Australia sits at a standard rate of 10% on most goods and services. Enter your amount above, and the calculator does the rest — no manual formulas needed.
Need to calculate profit too?
How to Use This GST Calculator
Getting a result takes no time:
- Enter your amount in the box above.
- Choose “Add GST” for a GST-inclusive price, or “Remove GST” for a GST-exclusive price.
- Your result appears instantly on screen.
- Click “Copy” to grab the number, or “Reset” to start again.
The rate is already set to 10%, so there’s nothing else to adjust.
Not sure which button to press? See the illustration it will clear your doubt.
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GST Calculation Formula
There are two directions to work in: adding GST to a price, or pulling GST back out of one. Here’s how each works.
Adding GST to a Price
Use this when your starting price doesn’t include GST yet.
- GST amount = Price × 0.10
- Total price with GST = Price × 1.10
Example: A $324 service.
- GST = $324 × 0.10 = $32.40
- Total = $324 × 1.10 = $356.40
Removing GST from a Price
Use this when your price already includes GST and you want to reverse GST.
- GST amount = Total price ÷ 11
- Price excluding GST = Total price ÷ 1.10
Example: A $356.40 invoice.
- GST = $356.40 ÷ 11 = $32.40
- Original price = $356.40 ÷ 1.10 = $324.00
Quick summary
|
To find |
Do this |
|---|---|
|
Add GST |
Multiply by 1.10 |
|
Remove GST |
Divide by 1.10 |
|
GST amount from a total |
Divide by 11 |
A note on rounding: the ATO requires GST on a tax invoice to be rounded to the nearest cent. If you’re calculating GST across multiple line items, round each line rather than rounding only the final total, otherwise your figure can drift a few cents from what’s on the invoice.
What Is GST in Australia?
GST stands for Goods and Services Tax. It’s a 10% tax added to most goods and services sold in Australia, introduced on 1 July 2000 under the Howard Government.
Registered businesses collect this tax from customers on behalf of the Australian Taxation Office (ATO). They then report and pay it through their Business Activity Statement (BAS). See our BAS guide if you’re not sure how it works.
In practice, most confusion doesn’t come from the 10% rate itself, it comes from knowing which direction to calculate in, and which items are exempt. Both are covered below.
GST Inclusive vs GST Exclusive
A GST-inclusive price already has the 10% tax built in. This is what customers usually see on a receipt. A GST-exclusive price is the amount before tax is added, which businesses often use for quoting and invoicing.
Knowing which one you’re working with matters most, because each uses a different formula. Mixing these two is one of the most common GST calculation mistakes people make.
Quick GST Reference Table
A fast lookup for common amounts:
|
Price (GST inclusive) |
GST amount |
Price (GST exclusive) |
|---|---|---|
|
$100 |
$9.09 |
$90.91 |
|
$200 |
$18.18 |
$181.82 |
|
$500 |
$45.45 |
$454.55 |
|
$1,000 |
$90.91 |
$909.09 |
|
$2,000 |
$181.82 |
$1,818.18 |
|
$5,000 |
$454.55 |
$4,545.45 |
For anything outside this table, use the calculator above for an exact figure.
GST-Free Items in Australia
Not everything sold in Australia carries GST. Some goods and services are exempt.
- Most basic food, such as bread, milk, fruit and vegetables
- Medical aids and equipment for people with disability
- Many prescription medicines and other GST-free health products.
- Menstrual products
- Precious metals like gold and silver
Food is the item people get wrong most often. A loaf of bread from the supermarket is GST-free, but the same bread served hot in a café is taxable. The ATO classifies it by how it’s sold, not just what it is. If you sell food and need to check a specific product, the ATO runs a GST food and beverage search tool that’s more reliable than guessing.
- Most medical and healthcare services
- Some education courses
- Selected childcare services
- Exports and international transport
GST on Imported Goods
GST on imports depends on the value of the goods and how they’ll be used.
For individuals: Before, low-value imports (generally under $1,000) were often GST-free, but now many imported goods under A$1,000 have GST, collected at checkout by overseas sellers or marketplaces, depending on the circumstances.
For businesses: GST applies to the full landed cost. The product price plus duty, shipping and insurance combined, not just the item price.
Example: Goods worth $40,000 with $4,300 in duty, freight and insurance. The GST calculated on the full $44,300, not the original $40,000. GST-registered businesses can usually claim this back as a GST credit.
When to Register for GST in Australia
Registration becomes compulsory once you hit certain thresholds, as set by the ATO’s GST registration rules.
Business type |
Registration required at |
|---|---|
|
Sole trader / business |
$75,000+ annual turnover |
|
Non-profit organisation |
$150,000+ annual turnover |
|
Taxi or rideshare driver |
Always required, regardless of income |
You have 21 days to register once you cross the threshold. See how to register for GST for further details. You’ll also need an Australian Business Number (ABN) before you can register for GST, our ABN registration guide walks through that process.
Selling on Uber, DiDi or a similar platform? See our dedicated rideshare GST guide — the rules are different from a standard small business.
Common GST Calculation Mistakes
A few errors come up again and again:
- Applying GST to items that are actually GST-free
- Subtracting 10% instead of dividing by 1.1 when removing GST
- Mixing up GST-inclusive and GST-exclusive prices
- Rounding too early and throwing off the final figure
- Using the standard formula for margin scheme sales (property and some second-hand goods use a different calculation, see our margin scheme guide
Using a calculator instead of doing the maths by hand removes most of these mistakes.
Where Your GST Actually Goes
GST is collected by the Australian Government and then shared with the states and territories. The Commonwealth Grants Commission decides how the money is divided to help each state provide essential services. That’s why GST funding is often discussed in the news.
Frequently Asked Questions
This calculator and the information on this page are for general guidance only and don’t replace professional tax advice. Figures are based on ATO guidance current as of July 2026 — for anything specific to your situation, check the ATO website or speak with a registered tax agent.
Michael Jones
Michael Jones has strong experience in tax management and accounting, with expertise in GST, BAS, and Australian taxes. He helps businesses stay compliant and manage finances in a simple and practical way, and through smartgstcalcau.com, he makes tax calculations easy to understand.