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Australian GST Calculator (Add & Extract)

Add 10% GST • Extract 1/11th from Inclusive Amounts • Business Activity Statement (BAS) Net Settlement

GST Calculation Mode

Toggle between adding GST to a net price or removing GST from a gross price.

Calculation Type

Add GST (+10%) Exclusive → Inclusive

Extract GST (1/11th) Inclusive → Exclusive

Amount Excluding GST ($) Rate: 10.0%

Quick Presets:

Quarterly BAS Summary (Optional)

GST on Sales (1A)

GST Credits (1B)

Net BAS Settlement (1A - 1B): $2,300 Payable

Total Price (GST Inclusive) 10% ADDED

$1,650.00

Base price $1,500.00 + $150.00 GST (10%).

Net Price (Excl. GST) $1,500.00

GST Amount (10% or 1/11th) $150.00

Gross Price (Incl. GST) $1,650.00

ATO GST Tax Invoice & Exemption Reference

Category	GST Treatment	Examples
Taxable Supplies	10% GST Applies	Commercial services, retail goods, electronics, motor vehicles
GST-Free Supplies	0% GST (Can claim credits)	Basic food (bread, milk), medical & health, education courses
Input-Taxed Supplies	No GST (No input credits)	Residential rent, financial supplies, second-hand residential premises

How Goods and Services Tax (GST) Works in Australia

The 1/11th Extraction Rule

When an Australian price is quoted as "GST inclusive" (such as a $110 retail price tag), the tax component is not 10% of $110 (which would be $11). Because the original price was marked up by 10% (100% + 10% = 110%), the tax constitutes exactly one-eleventh (1/11th) of the gross amount ($110 / 11 = $10.00). The pre-tax net price is $100.00.

When Must Australian Businesses Register for GST?

Under ATO regulations, you must register for GST if your business or enterprise has a gross turnover (gross income minus GST) of $75,000 or more ($150,000 for non-profit organizations). If you provide taxi, limousine, or ride-sourcing services (like Uber), you must register for GST regardless of your turnover.