Instantly convert GST inclusive/exclusive amounts and estimate BAS GST payable
Fast, free calculator optimized for Australian businesses with CSV export
Goods and Services Tax (GST) is a 10% broad-based tax on most goods, services and other items sold or consumed in Australia. If you're registered for GST, you need to include it in your prices and remit the difference to the ATO through your Business Activity Statement (BAS).
The GST you charge your customers on sales. This is 10% of the GST-inclusive price.
The GST you pay on business purchases and expenses. This is 10% of the GST-inclusive purchase price.
Your net GST obligation is calculated as: GST Collected - GST Paid
The BAS is your main way of reporting and paying your business tax obligations to the ATO. GST-registered businesses must lodge a BAS quarterly or monthly depending on your turnover.
Maintain detailed records of all GST-inclusive and GST-exclusive transactions. Use accounting software to track GST automatically.
Some items are GST-free (basic food, education) or input-taxed (financial services, residential rent). Know what applies to your business.
Don't forget to claim GST credits on business purchases. This reduces your net GST payable or increases your refund.
Late lodgement penalties apply. Set up reminders and use accounting software to ensure timely BAS submission.
Stop calculating manually. Upload receipts and track all your GST-eligible expenses in one place.
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Goods and Services Tax (GST) is a 10% tax applied to most goods and services sold in Australia. As a business registered for GST, you collect GST from customers and pay GST on business purchases, reporting the net amount to the ATO via your Business Activity Statement (BAS).
Key concept: Your BAS reports the difference between GST collected (from sales) and GST paid (on purchases). If you collected more than you paid, you owe the ATO. If you paid more, you get a refund.
Convert between GST-inclusive prices (what customers pay) and GST-exclusive amounts (your base price). Enter any amount and instantly see:
Estimate your BAS GST obligation by entering total sales and purchases for the period. The calculator shows:
Example: Product costs $100 (ex GST)
• GST amount: $100 × 10% = $10
• Price including GST: $100 + $10 = $110
Quick formula: Multiply by 1.1 (e.g., $100 × 1.1 = $110)
Example: Customer paid $110 (inc GST)
• Base amount: $110 ÷ 1.1 = $100
• GST component: $110 - $100 = $10
Quick formula: Divide by 11 to get GST (e.g., $110 ÷ 11 = $10)
Example: Quarter sales $55,000 (inc GST), purchases $33,000 (inc GST)
• GST collected: $55,000 ÷ 11 = $5,000
• GST paid: $33,000 ÷ 11 = $3,000
• Net GST payable: $5,000 - $3,000 = $2,000
To extract GST from an inclusive price, divide by 11, not multiply by 0.1. Example: $110 inc GST → GST is $110÷11=$10, not $110×0.1=$11.
Some items are GST-free (basic food, some medical, education). Don't include these in your GST calculations unless you're certain they attract GST.
Always clarify whether amounts are GST-inclusive or exclusive. Mixing them up leads to incorrect BAS reporting and potential penalties.
Track all your receipts and deductions in one place
Join 500+ Australians already tracking their tax deductions
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Interactive expense category checker — quickly find the correct ATO category with instant suggestions. Ideal for organizing receipts and preparing deductions.
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