tigtools

VAT Calculator

Add tax to a price before tax, or remove it from a price that already includes tax. Works for VAT, GST and sales tax at any rate you enter.

Runs in your browser No sign-up

Calculation
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Example rates

Shortcuts only. These numbers are not tied to any country. Check the current rate that applies to your product and location.

Net100.00
Tax (20%)20.00
Gross120.00

Formula: 100.00 × 20 ÷ 100 = 20.00; 100.00 + 20.00 = 120.00

Each amount is rounded to 2 decimals. The last line is found by subtraction, so net + tax always equals gross exactly.

How to use it

  1. Choose whether your amount is before tax (net) or already includes tax (gross).
  2. Enter the amount and the tax rate, or tap one of the example rates.
  3. Read the net amount, the tax and the gross amount, and copy the breakdown for an invoice or a spreadsheet.

How it works

Adding tax: tax = net × rate ÷ 100 and gross = net + tax. With 20% tax, 100.00 net becomes 120.00 gross.

Extracting tax from a price that already includes it: net = gross ÷ (1 + rate ÷ 100) and tax = gross − net. With 20% tax, 120.00 gross contains 20.00 tax, not 24.00. Taking 20% of the gross price is a common mistake: the tax share of a gross price is rate ÷ (100 + rate), which is 16.67% for a 20% rate.

Amounts are rounded to 2 decimals. The calculator rounds the tax (when adding) or the net amount (when extracting) to the cent and finds the remaining figure by subtraction, so the three lines always add up. Invoices with many lines may round per line or on the total, which can make the tax differ by a cent or two; follow the rule your tax authority or accounting software uses.

The example rate buttons are only shortcuts. Tax rates differ by country, region and type of product and they change over time, so check the rate that applies to you.

Examples

Quote a price including tax

A service costs 450.00 before tax and the rate is 21%. Tax is 450 × 0.21 = 94.50, so the gross price is 544.50.

Find the tax inside a receipt

A receipt totals 59.00 including 18% tax. Net = 59 ÷ 1.18 = 50.00 and tax = 59.00 − 50.00 = 9.00.

A price that doesn't divide evenly

100.00 gross at 20%: net = 100 ÷ 1.2 = 83.333…, rounded to 83.33, and tax = 100.00 − 83.33 = 16.67.

Frequently asked questions

How do I remove VAT from a price?

Divide the gross price by 1 plus the rate as a decimal. For 20% VAT, divide by 1.20: 120 ÷ 1.20 = 100. Do not subtract 20% of the gross price, which would give 96.

Does this calculator know my country's VAT rate?

No. It works with any rate you type. The example buttons are common round numbers, not current legal rates for any country.

Is this the same as sales tax or GST?

The arithmetic is the same. VAT and GST are often included in shelf prices, while US sales tax is usually added at the till. Use “Add” or “Extract” accordingly.

Why might my invoice differ by one cent?

Invoices may round tax on every line and then add the lines up, or calculate tax once on the total. Both are common, and they can differ by a cent or two.

Privacy

All calculations run in your browser. Amounts and rates are not sent or stored.