Free Australian GST calculator. Instantly add or remove 10% GST from any amount. Perfect for invoicing, quoting, and business accounting. Shows the GST-exclusive amount, GST component, and GST-inclusive total.
GST Exclusive
$0.00
GST (10%)
$0.00
GST Inclusive
$0.00
For Australian businesses
Invoicing, GST tracking and BAS-ready summaries, done automatically, free to start.
The Goods and Services Tax (GST) is a broad-based 10% tax on most goods, services, and other items sold or consumed in Australia. If your business is registered for GST, you need to include GST in the price of most goods and services you sell, and you can claim credits for the GST included in the price of goods and services you buy for your business.
The 10% rate has not changed since GST was introduced on 1 July 2000, which is why the same two conversions cover almost every situation: adding 10% to a GST-exclusive quote, and pulling the GST component out of a GST-inclusive receipt. The calculator above does both; the sections below give you the formulas, a quick-reference table for common amounts, and the rules for the sales GST does not apply to.
Australia's GST rate is a flat 10%, so the maths is simple:
Worked example. You quote a job at $500 before tax. Adding GST: $500 × 1.1 = $550, of which $50 is GST ($500 × 0.10). If a supplier instead gives you a $550 GST-inclusive invoice, the GST component is $550 ÷ 11 = $50, and the GST-exclusive cost is $550 ÷ 1.1 = $500.
The most common mistake is taking 10% off a GST-inclusive price to "remove GST". That over-removes: 10% of $110 is $11, but the GST inside $110 is only $10. Always divide an inclusive price by 11 to find the GST, or by 1.1 to find the ex-GST amount.
The table below covers the amounts people look up most often. Read it left to right to add GST to an ex-GST price, or use the last two columns to remove GST when the amount in the first column is a GST-inclusive total. Figures are rounded to the nearest cent.
| Amount | GST to add (10%) | Price incl. GST (× 1.1) | GST inside (÷ 11) | Price excl. GST (÷ 1.1) |
|---|---|---|---|---|
| $10 | $1.00 | $11.00 | $0.91 | $9.09 |
| $20 | $2.00 | $22.00 | $1.82 | $18.18 |
| $50 | $5.00 | $55.00 | $4.55 | $45.45 |
| $100 | $10.00 | $110.00 | $9.09 | $90.91 |
| $150 | $15.00 | $165.00 | $13.64 | $136.36 |
| $200 | $20.00 | $220.00 | $18.18 | $181.82 |
| $250 | $25.00 | $275.00 | $22.73 | $227.27 |
| $500 | $50.00 | $550.00 | $45.45 | $454.55 |
| $750 | $75.00 | $825.00 | $68.18 | $681.82 |
| $1,000 | $100.00 | $1,100.00 | $90.91 | $909.09 |
| $1,500 | $150.00 | $1,650.00 | $136.36 | $1,363.64 |
| $2,000 | $200.00 | $2,200.00 | $181.82 | $1,818.18 |
| $2,500 | $250.00 | $2,750.00 | $227.27 | $2,272.73 |
| $5,000 | $500.00 | $5,500.00 | $454.55 | $4,545.45 |
For any amount not in the table, enter it in the calculator above, or apply the formulas directly: multiply by 1.1 to add GST, divide by 11 for the GST component of an inclusive price.
Not every sale in Australia carries GST. The ATO groups sales into three types, and the type determines both whether you charge GST and whether you can claim GST credits on the purchases you used to make the sale:
| Sale type | GST on the sale | GST credits on related purchases | Common examples |
|---|---|---|---|
| Taxable | 10% | Yes | Most goods and services: trades work, consulting, retail stock, equipment, software |
| GST-free | 0% | Yes | Most basic food, some education courses, some medical and health services, exports |
| Input-taxed | None charged | No | Financial supplies (lending, some fees), residential rent, existing residential property sales |
The distinction between GST-free and input-taxed matters more than it looks. A cafe selling GST-free basic food can still claim back the GST on its rent, equipment and supplies. A landlord earning input-taxed residential rent cannot claim the GST on the expenses of earning that rent. If your business makes a mix of sale types, each invoice line needs the right treatment, which is where invoicing software that handles GST line by line saves you from manual corrections at BAS time.
GST of 10% applies to most goods imported into Australia, whether or not the buyer is registered for GST. How it is collected depends on the value of the consignment:
If you are a GST-registered business, GST paid on goods you import for use in your business is generally claimable as a GST credit on your BAS, the same as GST on a local purchase. Eligible importers can also apply for the ATO's deferred GST scheme, which moves the GST on imports from the border to the BAS so it is reported and claimed in the same statement instead of tying up cash at customs. Services and digital products bought from overseas (software subscriptions, for example) can also attract GST under the imported-services rules, so check overseas invoices before assuming there is no GST in them.
When you lodge your BAS, you report the GST you've collected on sales (label 1A) and the GST you've paid on purchases (label 1B). The difference is either paid to the ATO or refunded to you. Most businesses lodge BAS quarterly, though some lodge monthly or annually. To estimate what your next statement will look like before you lodge, the BAS calculator works out your 1A, 1B and net GST position from your sales and purchase totals.
The practical challenge is not the arithmetic, it is having clean records of every GST amount collected and paid across the quarter. The OneBookPlus finance and bookkeeping features keep a running record of GST on your invoices and expenses, so BAS time is a report you check rather than a shoebox you reconstruct.
You must register for GST if your annual turnover is $75,000 or more ($150,000 for non-profit organisations). Once registered, you must charge GST on your taxable sales, issue tax invoices that show the GST amount, lodge regular BAS, and keep GST records for at least five years. Registering below the threshold is optional: it lets you claim GST credits on purchases, but it also means charging your customers 10% more (or absorbing it) and taking on BAS lodgment obligations, so weigh it up before opting in early.
GST in Australia is a flat 10% on most goods and services. It has stayed at 10% since it was introduced on 1 July 2000. So a $100 GST-exclusive sale carries $10 of GST, making the GST-inclusive price $110.
To work out the GST amount on a GST-exclusive price, multiply it by 0.10 (10%). To work out the GST already included in a GST-inclusive price, divide the total by 11. For example, the GST inside a $110 price is $110 / 11 = $10.
GST (Goods and Services Tax) is a 10% tax on most goods, services, and other items sold or consumed in Australia. It was introduced on 1 July 2000. Businesses registered for GST collect it from customers and remit it to the ATO.
To add GST, multiply the GST-exclusive amount by 1.1. For example, $100 + GST = $100 x 1.1 = $110.
To remove GST, divide the GST-inclusive amount by 11 to get the GST component, then subtract it. Or simply divide the GST-inclusive price by 1.1. For example, $110 / 1.1 = $100 ex-GST.
You must register for GST if your business has a GST turnover of $75,000 or more per year ($150,000 for non-profit organisations). Taxi, limousine and ride-sourcing drivers (Uber, DiDi, Ola, etc.) must register for GST regardless of turnover, even on their first fare. You can voluntarily register if your turnover is below the threshold.
Some items are GST-free, meaning no GST is charged. Examples include most basic foods, some education courses, some medical services, and exports. These are different from input-taxed items like financial supplies and residential rent.
An input tax credit (also called a GST credit) is the GST you can claim back on the business purchases you use to run your enterprise. If you are registered for GST, you offset the GST you collect on sales (output tax, BAS label 1A) against the GST you paid on purchases (input tax credits, BAS label 1B); you only pay the ATO the difference. You generally need a valid tax invoice to claim a credit on a purchase over $82.50 (including GST).
It depends which way you are converting. If $100 is the GST-exclusive price, the GST is $10 and the GST-inclusive total is $110. If $100 already includes GST, the GST component is $100 / 11 = $9.09 and the GST-exclusive price is $90.91.
Neither carries GST on the sale itself, but the GST-credit treatment differs. On GST-free sales (most basic food, some education courses, some health services, exports) you can still claim GST credits on the business purchases used to make those sales. On input-taxed sales (financial supplies, residential rent) you cannot claim GST credits on purchases that relate to making those sales.
Generally yes. GST of 10% applies to most goods imported into Australia. For consignments over A$1,000, GST is collected at the border as part of customs clearance and is calculated on the customs value plus any duty, transport and insurance. Since 1 July 2018, GST also applies to low-value imported goods (A$1,000 or less) sold to Australian consumers, usually collected by the overseas seller or online marketplace at checkout. GST-registered businesses can generally claim GST credits for imports used in their business.
Exports of goods from Australia are generally GST-free, provided the goods are exported within the required timeframe (usually 60 days of payment or invoice). Many services supplied to customers who are outside Australia are also GST-free. There are exceptions, for example services consumed in Australia, so check the ATO's export rules or ask a registered tax agent before invoicing without GST.
Sources & methodology
This tool applies Australia's flat 10% GST rate (unchanged since 1 July 2000): to add GST it multiplies the GST-exclusive amount by 1.1, and to remove GST it divides the GST-inclusive amount by 11 for the GST component. Figures are computed in your browser, nothing you enter is stored or sent to a server.
Authoritative sources
Reviewed by Bishal Shrestha, Founder of OneBookPlus, 10+ years building tools with Australian tax-agent and BAS-agent practices. Last reviewed and updated: June 2026.
Disclaimer: This calculator produces estimates only and is not tax advice. Tax outcomes depend on your individual circumstances. For decisions that affect your tax position, consult a registered tax agent or the ATO directly.
OneBookPlus handles invoicing, GST tracking, BAS prep, and ATO lodgement automatically.
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