GST Calculator

What is GST?

GST (Goods and Services Tax) is a value-added tax levied on most goods and services sold for domestic consumption. It is a consumption tax paid by consumers, but collected and remitted to the government by businesses selling the goods and services.

GST is used in many countries including Australia, Canada, India, Malaysia, New Zealand, and Singapore. The tax rate varies by country and sometimes by product category.

GST Calculation Formulas

The formulas for calculating GST are:

When adding GST:

GST Amount = Net Amount × (GST Rate ÷ 100)

Gross Amount = Net Amount + GST Amount

Gross Amount = Net Amount × (1 + GST Rate ÷ 100)

When removing GST:

Net Amount = Gross Amount ÷ (1 + GST Rate ÷ 100)

GST Amount = Gross Amount - Net Amount

Example Calculations

Adding GST (10% rate):

• Net Amount: $100
• GST Amount: $100 × 10% = $10
• Gross Amount: $100 + $10 = $110

Removing GST (10% rate):

• Gross Amount: $110
• Net Amount: $110 ÷ 1.10 = $100
• GST Amount: $110 - $100 = $10

GST Rates by Country

• Australia: 10% (standard rate)
• Canada: 5% (federal GST), plus provincial taxes vary
• India: 5%, 12%, 18%, 28% (multiple rates by product)
• Malaysia: 0% (GST replaced by SST in 2018)
• New Zealand: 15% (GST, also called Goods and Services Tax)
• Singapore: 8% (rising to 9% in 2024)
• Hong Kong: No GST/VAT system

For Business Owners

• Register for GST when required by law (threshold varies by country)
• Charge GST on taxable supplies to customers
• Claim input tax credits for GST paid on business purchases
• File GST returns regularly (monthly, quarterly, or annually)
• Keep accurate records of all transactions
• Issue proper tax invoices with GST details
• Understand zero-rated, exempt, and taxable supplies
• Consider using accounting software for GST tracking

For Consumers

• Check if prices include or exclude GST
• Keep receipts for business-related purchases for tax credits
• GST is included in most retail prices in some countries
• Some essential items may be GST-free or zero-rated
• International purchases may have different GST treatment
• Compare prices including GST for accurate cost

Common GST-Free Items

Many countries exempt certain items from GST:

• Basic food items (varies by country)
• Healthcare and medical services
• Education services
• Financial services (some)
• Charitable activities
• Exports (zero-rated)
• Residential rent (some countries)
• Fresh produce (some countries)

When to Use This Calculator

• Pricing products for sale (add GST to cost price)
• Creating invoices and quotes
• Calculating tax credits on purchases (remove GST)
• Preparing financial reports and accounts
• Budgeting and financial planning
• Comparing prices from different suppliers
• Verifying GST calculations on receipts
• Tax return preparation