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GST Calculator Australia

Add or remove 10% GST from any amount. Calculate GST for BAS returns, invoice preparation, and business accounting.

GST Calculator
Amount
$
Calculate
GST rate
%

BAS Quarterly Summary

Total GST-inclusive sales
$
Total GST-inclusive purchases
$
Result
GST Amount
$100.00
ItemAmount

GST in Australia

Australia's 10% Goods and Services Tax (GST) applies to most goods and services. Registered businesses collect GST and remit it to the ATO via the Business Activity Statement (BAS). GST-free supplies include most fresh food, education, medical services, and childcare.

BAS Reporting

G1 = Total sales (inc. GST) | G10 = Total purchases (inc. GST) | G20 = GST on sales (G1/11) | G30 = GST credits on purchases (G10/11). If G20 > G30, you pay the difference. If G20 < G30, you receive a refund.

1/11th Rule

GST component = GST-inclusive price ÷ 11. Ex-GST price = GST-inclusive price × 10/11.