Free GST & Profit Calculator Australia
Calculate GST collected, GST credits, net GST payable and your estimated business profit in seconds.
Get a quick estimate before reviewing your BAS, bookkeeping or business performance. This calculator is a guide only and should not be relied on as tax advice.
GST + Profit Estimator
Enter your revenue and expenses, select whether the figures are GST-inclusive or GST-exclusive, and instantly estimate your GST position and business profit.
Results
What this GST calculator shows
Use this calculator to understand how GST affects your revenue, expenses and estimated profitability before preparing your BAS.
Estimate the GST portion in your revenue and expenses.
See whether your numbers suggest GST payable or refundable.
Work out profit on an ex-GST basis for cleaner decision-making.
Get a faster sense of how sales and costs are affecting your margin.
Understanding GST and business profit
For most Australian small businesses, GST is charged at 10% on taxable sales. If your business is GST registered, the GST you collect from customers is usually not part of your true revenue.
In the same way, the GST included in business purchases is usually not part of your true operating expense when you can claim the input tax credit. That is why it often makes more sense to assess profit on an ex-GST basis.
Common GST and profit mistakes
These are the issues that often make business numbers look better or worse than they really are.
GST-inclusive revenue
Using GST-inclusive sales as if they are true revenue can overstate business performance.
Ignored GST credits
Ignoring GST credits in supplier expenses can make your cost base look higher than it is.
Profit vs cash
Profit does not automatically equal cash available, especially when BAS, payroll and bills are still due.
Need more than a calculator?
If the results do not look right, the issue is often inaccurate bookkeeping, unreconciled transactions or incorrect GST coding.
Review our bookkeeping services, BAS support, payroll services or small business accounting for help keeping your numbers accurate and easier to manage.
Or if you are not sure what you need yet, reach out here and we will point you in the right direction.
Frequently asked questions
What is GST in Australia?
GST stands for Goods and Services Tax. In Australia, the standard GST rate is 10% on most taxable goods and services.
Should profit be calculated including or excluding GST?
For GST-registered businesses, profit is usually better assessed excluding GST because GST collected is not generally business income and GST on claimable expenses is not usually a true business cost.
Can this calculator replace accounting advice?
No. It is a general estimator only. It does not cover GST-free sales, input-taxed items, partial credits, payroll, or business-specific tax treatment.
Who is this calculator for?
It is useful for Australian small business owners who want a quick estimate before reviewing BAS, bookkeeping, or profit numbers in more detail.
How do I calculate GST in Australia?
GST is typically calculated at 10% on taxable sales. If your figures include GST, divide by 1.1 to find the GST-exclusive amount. If they exclude GST, multiply by 10% to calculate the GST portion.
Need help reviewing your GST figures?
Use this calculator as a starting point, then speak with our team if you’d like help reviewing your GST, BAS or bookkeeping records.
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