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GST Calculator: The Complete Guide

GST for Australia, India, New Zealand, Canada & Singapore. Everything you need to know — plus a free tool to do it instantly.

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What is gst?

GST (Goods and Services Tax) is the consumption tax system used in Australia, New Zealand, India, Canada, Singapore, and several other countries. Rates and structures differ significantly: Australia has a flat 10%, India has four GST slabs (5%, 12%, 18%, 28%), Singapore increased to 9% in 2024, Canada has federal GST plus provincial HST/PST, and New Zealand charges 15% on almost all goods and services.

How it works

Select your country and GST type from the dropdown. The rate auto-fills. Choose 'Add GST' to find the gross price, or 'Remove GST' to find the net from a gross price. Enter your amount and see the breakdown instantly.

Why it matters

GST compliance is mandatory once you exceed registration thresholds (AU: A$75,000, NZ: NZ$60,000, India: ₹20 lakh, Canada: CA$30,000, Singapore: S$1M). This tool ensures your pricing is accurate.

Common mistakes

Using the wrong GST slab in India — always verify the HSN/SAC code for your product
Not adjusting for the Singapore GST rate increase to 9% (from 8%) in January 2024
Confusing Canada's federal GST (5%) with provincial HST (which combines GST + PST)

Best practices

Register for GST before exceeding the threshold — not after
File GST returns on time to avoid penalties
Keep detailed records of all GST paid (input tax) to maximise your credit

Ready to put this into practice?

Use the free GST Calculator to create a real gst in under a minute — no signup, exports to PDF and Excel.

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