GST Calculator
Calculate GST (Goods and Services Tax) — add GST to a price or find the pre-GST price from a GST-inclusive total.
Works for India, Australia, Canada, and more.
GST (Goods and Services Tax) is a broad-based consumption tax applied to most goods and services. It is used in Australia, Canada, India, New Zealand, Singapore, and many other countries. The mechanics differ slightly by country but the core arithmetic is the same.
Adding GST to a pre-tax price: GST Amount = Pre-Tax Price × GST Rate Total Price = Pre-Tax Price × (1 + GST Rate) Total Price = Pre-Tax Price + GST Amount
Extracting GST from a GST-inclusive price (reverse calculation): GST Amount = Inclusive Price × (GST Rate ÷ (1 + GST Rate)) Pre-Tax Price = Inclusive Price ÷ (1 + GST Rate)
GST rates by country (2024):
| Country | Standard GST/VAT Rate | Notes |
|---|---|---|
| Australia | 10% | Most goods/services; food, healthcare exempt |
| New Zealand | 15% | Very broad base, few exemptions |
| Canada | 5% GST | + Provincial tax (PST/HST varies: 0–10%) |
| India | 5%, 12%, 18%, 28% | Multi-slab system by product category |
| Singapore | 9% | Increased from 8% in Jan 2024 |
| European VAT | 20–25% | Varies by EU country and product |
Input Tax Credit (ITC) — for businesses: Businesses registered for GST collect GST on sales and can claim back GST paid on business purchases: Net GST Payable = GST Collected on Sales − GST Paid on Purchases
Worked example — Australia (10% GST):
Scenario 1 — adding GST: Pre-tax invoice: $850 for web design services.
- GST: $850 × 0.10 = $85.00
- Total invoice: $935.00
Scenario 2 — extracting GST from total: Customer paid $935 for a product. What is the GST component?
- GST = $935 × (0.10 ÷ 1.10) = $935 × 0.0909 = $85.00
- Pre-tax price = $935 ÷ 1.10 = $850.00
Business ITC example: A company collected $22,000 in GST from customers and paid $8,500 in GST on business expenses. Net GST remittance to tax authority = $22,000 − $8,500 = $13,500 payable
This mechanism prevents tax pyramiding (tax on tax) throughout the supply chain.