Como Calcular Impostos em Faturas (IVA, GST)

How to Calculate Invoice Tax (VAT, GST, Sales Tax Explained)

Three Tax Systems Explained

There are three main ways taxes work on invoices:

1. VAT (Value Added Tax) — used in UK, EU, Australia
2. GST (Goods and Services Tax) — used in Canada, Australia, New Zealand
3. Sales Tax — used in the US and some countries

VAT (Value Added Tax)

Formula: Total = Amount + (Amount × VAT Rate)

Example: ``` Services rendered: $1,000 VAT (20%): $200 Total due: $1,200 ```

GST (Goods and Services Tax)

Formula: Total = Amount + (Amount × GST Rate)

Example: ``` Consulting services: $1,000 GST (10%): $100 Total due: $1,100 ```

Sales Tax (US & Other)

Formula: Total = Amount + (Amount × Sales Tax Rate)

Example: ``` Products sold: $500 Sales Tax (8.5%): $42.50 Total due: $542.50 ```

Which Tax Rate Applies to You?

United States? - Sales tax rate depends on your state (0–10%) - You may be exempt if you're a B2B service provider

UK or EU? - Use VAT (20% UK, 17–27% EU varies) - You may be exempt if under threshold (~£85K/year)

Canada? - Federal GST is 5%, plus provincial tax (0–10%) - Total combined is typically 5–15%

Australia, NZ, Singapore? - Use GST (Australia & NZ: 10%, Singapore: 7%)

[Use a tax-aware invoice generator](/free-vat-invoice-generator) to calculate automatically.