How to Add GST, Sales Tax & VAT on an Invoice

Tax rules differ by country, but the invoice layout is similar: show the tax name, rate, and amount clearly under the subtotal.

Common tax names

• GST — Goods and Services Tax
• VAT — Value Added Tax
• Sales Tax — common in the US
• ICMS / ISS — Brazil

How SingleInvoice calculates tax

Taxable amount = Subtotal − Discount. Each tax line is: Taxable × (Rate ÷ 100). You can add multiple taxes (for example GST 17% + Sales Tax 5%).

Best practices

• Use the official tax name your client expects
• Show the percentage next to the name
• Keep notes for tax ID / registration numbers

Try multiple taxes on a free invoice →