GST Calculator

Calculate GST (Goods and Services Tax) amounts and total prices with our easy-to-use calculator. Add or remove GST for accurate pricing.

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Calculate GST

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Understanding GST

Goods and Services Tax (GST) is a value-added tax levied on most goods and services sold for domestic consumption. It is a consumption tax ultimately paid by the end consumer but collected by businesses at each stage of the production and distribution chain.

How GST Works

GST operates on a credit system, where businesses can claim input tax credits for the GST they pay on their purchases against the GST they collect on their sales. This mechanism helps avoid tax cascading (tax on tax) and ensures that the tax burden ultimately falls on the final consumer.

GST Calculation Formulas

Adding GST to a Price

GST Amount = Original Price × (GST Rate / 100)

Price Including GST = Original Price + GST Amount

Removing GST from a Price

Price Excluding GST = Price Including GST ÷ (1 + GST Rate / 100)

GST Amount = Price Including GST - Price Excluding GST

GST Rates Around the World

GST/VAT rates vary significantly around the world. Here are some examples of standard rates in different countries:

  • Australia: 10% GST
  • New Zealand: 15% GST
  • Singapore: 7% GST (increasing to 8% in 2023)
  • India: Multiple rates - 0%, 5%, 12%, 18%, 28%
  • United Arab Emirates: 5% VAT
  • United Kingdom: 20% VAT
  • European Union: Minimum standard rate of 15%, varies by country
  • Canada: 5% GST plus provincial sales taxes

Many countries also have reduced rates for essential goods and services, as well as exempt categories.

GST Registration and Compliance

In most jurisdictions, businesses must register for GST if their turnover exceeds a specified threshold. Once registered, businesses must:

  • Charge GST on taxable sales
  • Issue proper tax invoices
  • File regular GST returns
  • Maintain accurate records
  • Remit the net GST collected to tax authorities

Common GST Terms

  • Input Tax: GST paid on purchases
  • Output Tax: GST collected on sales
  • Input Tax Credit (ITC): Credit for input tax that can be offset against output tax
  • Taxable Supply: Goods or services subject to GST
  • Exempt Supply: Goods or services not subject to GST
  • Zero-rated Supply: Supply taxed at 0% GST rate, allowing for input tax credits

Note: This calculator provides general guidance. For specific tax advice, consult with a tax professional familiar with the GST/VAT regulations in your jurisdiction.

GST Calculator Tips

  • Use "Add GST" when you need to calculate the final price including GST
  • Use "Remove GST" when you have the total amount and need to find the pre-GST price
  • For businesses, keep track of GST paid on purchases for potential input tax credits
  • Select the appropriate GST rate for your country or use the custom rate option
  • Use the Multiple Items calculator for invoices or shopping lists with different GST rates

Quick GST Reference

Rate GST on $100 Total with GST
5% $5.00 $105.00
7% $7.00 $107.00
10% $10.00 $110.00
15% $15.00 $115.00
18% $18.00 $118.00

Currency Symbols

Country Currency Symbol
Australia Australian Dollar $
Singapore Singapore Dollar $
United Arab Emirates Dirham د.إ
New Zealand New Zealand Dollar $
India Rupee