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Tax / VAT / GST Calculator

Add tax to a net amount or extract the tax component from a gross amount. Works with any tax rate (sales tax, VAT, GST, etc.).

Net amount (before tax) when adding tax, or gross amount (including tax) when extracting tax.

Results

Pre-Tax Amount$100.00
Tax Amount$10.00
Total (incl. Tax)$110.00

📖What is it?

A versatile tax calculator that works in two modes: "Add Tax" calculates the tax on a pre-tax (net) amount and shows the gross total; "Extract Tax" takes a tax-inclusive (gross) amount and breaks it down into the pre-tax price and the tax component. It works with any tax system — sales tax, VAT, GST, HST, etc.

🎯How to use

1. Enter the amount. 2. Enter the applicable tax rate as a percentage. 3. Select the calculation mode: "Add Tax" if the amount is before tax, or "Extract Tax" if the amount already includes tax. The calculator shows the pre-tax amount, tax amount, and total.

💡Example scenario

A freelancer invoices $100 and needs to add 10% VAT. In "Add Tax" mode with amount = 100 and rate = 10%, the tax is $10.00 and the total is $110.00. Conversely, if a receipt shows $110 including tax, switching to "Extract Tax" reveals $100 pre-tax and $10 tax.

🏆Pro tip

When extracting tax from a gross amount, the formula is: tax = amount − amount ÷ (1 + rate/100). A common mistake is to simply multiply the gross amount by the rate — that gives an incorrect, inflated tax figure.