Estimate GST collected on taxable sales, GST credits on eligible business purchases and your potential net GST position before you prepare your Business Activity Statement.


GST is a 10% tax on most goods, services and other items sold or consumed in Australia. If your business is registered for GST, you generally collect GST on taxable sales and may be entitled to claim GST credits for eligible business purchases. The difference between GST payable on taxable sales and eligible GST credits helps determine whether you may need to pay GST to the ATO or receive a GST refund for the period.
This BAS / GST Calculator is designed as a practical starting point for checking those figures. Your actual BAS can also include PAYG withholding, PAYG instalments, adjustments and transactions that are GST-free, input taxed or subject to special rules. Use the estimate to sense-check your records, then confirm the final figures before lodging your BAS with the ATO.
Understand what the GST estimate covers and where a BAS may require further review.
Enter the relevant sales and purchase figures shown in the calculator. For standard taxable transactions, it estimates GST collected, eligible GST credits and the resulting net GST position. The result is an estimate only because BAS reporting can also involve adjustments and other tax labels.
For a standard taxable sale that already includes 10% GST, the GST component is generally one-eleventh of the GST-inclusive price. For example, a $110 taxable sale contains $10 GST. GST-free and input-taxed transactions are treated differently.
No. You generally need to be registered for GST, the purchase must be for your business to the relevant extent, GST must generally have been included in the price, and you need to keep appropriate records, such as a tax invoice where required. Some purchases are GST-free, input taxed or private and do not give rise to a GST credit.
No. It focuses on estimating GST figures. A BAS may also include PAYG withholding, PAYG instalments, FBT instalments or other amounts depending on your registration and reporting obligations.
Check whether your figures include GST-free sales, input-taxed sales, private-use adjustments, credit notes or transactions recorded in the wrong period. If the difference is not clear, review the underlying transactions before lodging your BAS.
SMH Accountants & Advisors can review your BAS records, GST treatment and reporting position so you can lodge with greater clarity.