GST Calculator
Goods and Services Tax (GST) is the name used in several major economies for a consumption tax that is structurally identical to VAT: it is levied at each stage of the supply chain, with businesses remitting tax on the value they add and reclaiming tax paid on their inputs. The name differs by country — the UK and EU use "VAT", while Australia, New Zealand, Canada, India, and Singapore use "GST" — but the mechanics of calculation are the same. The rates vary significantly: Australia charges 10%, New Zealand 15%, Canada 5% (federal), India 5–28% depending on the product category, and Singapore 9%.
This calculator handles both adding and removing GST. To add GST to a net (excluding GST) price, enter the amount and select your country's rate — the calculator shows the GST amount and the total GST-inclusive price you charge customers. To remove GST from a price that already includes it, switch to remove mode and enter the gross amount — the calculator extracts the GST component and shows the original pre-tax price. Preset rates are included for all major GST countries, and you can enter a custom rate for any jurisdiction or product category.
In Australia, GST applies to most goods and services but exempts fresh food, basic health products, medical services, and educational courses. New Zealand applies GST with very few exemptions — almost all goods and services including food are taxed. In Canada, the federal GST of 5% is supplemented by provincial sales taxes (PST) or Harmonised Sales Tax (HST) that varies by province — Ontario's HST is 13% (5% federal + 8% provincial). In India, GST replaced multiple state and central taxes in 2017 and operates across four rate slabs (5%, 12%, 18%, and 28%) with some items exempt.
Formula
GST Amount = Net Amount × (GST Rate ÷ 100) Gross Amount = Net Amount + GST Amount Net Amount = Gross Amount ÷ (1 + GST Rate ÷ 100)
GST works identically to VAT: to add GST, multiply the net amount by the GST rate and add it to the net. To remove (extract) GST from an inclusive price, divide by (1 + GST rate as decimal). For Australia's 10% GST, that means dividing by 1.10.
Worked Examples
Frequently Asked Questions
What is GST?▾
GST (Goods and Services Tax) is a value-added tax on most goods and services sold domestically. It is economically equivalent to VAT used in the UK and EU. Countries using GST include Australia (10%), New Zealand (15%), Canada (5% federal), India (5–28% by category), and Singapore (9%). The name differs by country but the mechanism — tax at each supply chain stage with input tax credits — is the same.
What is the GST rate in Australia?▾
Australia's standard GST rate is 10%, introduced in July 2000. It applies to most goods and services. GST-free supplies include most fresh food, basic health and medical services, childcare, and educational courses. Some supplies are input-taxed (like residential rent and financial services), meaning the supplier cannot claim GST credits on related purchases.
What is the GST rate in New Zealand?▾
New Zealand's GST rate is 15%, increased from 12.5% in 2010. Unlike Australia, New Zealand has very few GST-free items — almost all goods and services, including food, are subject to GST. The simplicity of New Zealand's GST system is often cited as a model for consumption tax design.
What is the GST rate in Canada?▾
Canada's federal GST rate is 5%. However, most provinces also charge a provincial sales tax (PST) separately or combine it with the federal GST into a Harmonised Sales Tax (HST). Ontario charges 13% HST (5% + 8%), British Columbia charges 12% (5% GST + 7% PST), and Alberta has no provincial sales tax, making the total rate just the 5% federal GST.
How do I remove GST from a price that includes GST?▾
Divide the GST-inclusive price by (1 + GST rate as a decimal). For Australia's 10%: divide by 1.10. For New Zealand's 15%: divide by 1.15. For Canada's 5%: divide by 1.05. For example, A$110 ÷ 1.10 = A$100 ex-GST, and the GST component is A$10. Never subtract the rate percentage directly — that gives the wrong answer.
Is GST the same as VAT?▾
Yes — GST and VAT are economically and mechanically identical taxes. Both are collected at each stage of the supply chain, with businesses claiming credits for tax paid on inputs. The end consumer bears the full tax cost. The difference is purely in naming: the UK and most of Europe call it VAT; Australia, New Zealand, Canada, and India call it GST. The calculation formulas are identical.
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All calculations are for informational purposes only. They should not replace professional financial, tax, or legal advice. Always consult a qualified professional for decisions affecting your finances or business.