Australia GST calculator: calculate GST amount, net price, and total
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Examples
FAQs
Is GST always 10% in Australia?
For taxable supplies, GST is 10% of the value.
How do I add GST to a GST-exclusive price?
Multiply by 1.1 to get the GST-inclusive total.
How do I work out GST included in a price?
Divide the GST-inclusive amount by 11 to get the GST component.
What’s the difference between GST-free and input-taxed?
Both are sold without GST, but GST-free sales generally allow GST credits on related purchases, while input-taxed sales generally don’t.
When must a business register for GST?
When GST turnover is $75,000+ (or $150,000+ for not-for-profits), and taxi/ride-sourcing must register regardless of turnover.
If I’m not registered for GST, should I add GST to my prices?
Generally no—if you’re not registered and not required, you don’t charge GST.
Are groceries GST-free?
Many basic foods are GST-free, but some items like prepared food can be taxable.
Do I have to give a tax invoice?
If registered and the sale is $82.50 or more (inc GST), you must issue a tax invoice within 28 days (and on request even under that amount).
Why is my GST result 1 cent different from an invoice?
Rounding can differ depending on whether GST is rounded per line item or across the invoice.
How is GST calculated on imported goods?
GST is 10% of the value of the taxable importation: customs value + duty + transport/insurance + WET (if any).
How do I calculate GST on property under the margin scheme?
GST is 1/11 of the margin, not 1/11 of the full price.
Note: This calculator provides an estimate. Rates can vary by region and change over time. It is not tax advice.
See more in calculators for Australia.
Sources
- ATO — GST overviewAustralian Taxation Office · Australia · Accessed: 2026-01-28GST basics, registration, and core rules.
- ATO — GST-free salesAustralian Taxation Office · Australia · Accessed: 2026-01-28GST-free categories and examples.
- ATO — Input-taxed salesAustralian Taxation Office · Australia · Accessed: 2026-01-28Input-taxed supplies and GST credit limitations.
- ATO — Registering for GSTAustralian Taxation Office · Australia · Accessed: 2026-01-28Registration thresholds and requirements.
- ATO — Tax invoicesAustralian Taxation Office · Australia · Accessed: 2026-01-28Tax invoice rules and $82.50 threshold.
- ATO — GST and importsAustralian Taxation Office · Australia · Accessed: 2026-01-28GST on taxable importations and value of taxable importation.
- ATO — Margin scheme for propertyAustralian Taxation Office · Australia · Accessed: 2026-01-28Margin scheme calculation (GST = margin ÷ 11).
- Australian Border Force — Taxes and duties on importsAustralian Border Force · Australia · Accessed: 2026-01-28Import duty and GST components for import calculations.