GST / VAT Calculator

Use this free GST Calculator Australia to add or remove 10% Goods and Services Tax from any amount, or switch country preset to handle VAT for New Zealand (15%), the United Kingdom (20%), the European Union and beyond. It is useful for small business owners pricing services, freelancers issuing tax invoices, accountants reconciling supplier bills, online sellers calculating margins, and shoppers checking a receipt. Enter a price and the calculator returns the GST component, the price including GST and the price excluding GST in one screen. Switch between 'add tax' and 'remove tax' modes with a single click. Runs entirely in your browser, no sign-up.

Country / Rate Preset

Tax Rate (%)

Mode

Amount

This calculator provides general estimates only. Results may vary depending on your personal circumstances, current tax rules, fees, deductions, interest rates, and other factors. It should not be treated as financial, tax, legal, or professional advice.

How to Use This GST / VAT Calculator

Adding or removing GST takes one input and one toggle.

Pick the country preset — Australia (10%), New Zealand (15%), UK (20%) or enter a custom rate.
Choose 'add GST' if your figure is currently exclusive of tax, or 'remove GST' if it already includes tax.
Type the amount into the input field.
Read the three values returned: net price, tax component and gross price.
Use Copy to grab any of the three figures for an invoice or quote.

Example Calculation

If a service is priced at $1,100 inclusive of 10% Australian GST, the GST component is $1,100 ÷ 11 = $100 and the GST-exclusive price is $1,000. Adding GST to a $250 net amount works the other way: $250 × 1.10 = $275 inclusive, with the $25 GST broken out as a separate line item on the invoice.

How This GST / VAT Calculator Works

GST is a value-added tax charged at every step of supply, with the final consumer bearing the cost. In Australia the GST rate has been 10% since the system started in July 2000, and most goods and services attract it; a few categories are GST-free (basic food, most education and most health services). Adding GST is straightforward — multiply the GST-exclusive price by the rate plus one, so $100 plus 10% GST becomes 100 × 1.10 = $110. Removing GST is the reverse: divide the GST-inclusive price by one plus the rate, so $110 ÷ 1.10 = $100, and the GST component is the difference, $10. For other countries the calculator just substitutes the local rate. Businesses registered for GST claim back GST paid on inputs (input tax credits) and pass on GST collected to the ATO each quarter or month, depending on turnover. The calculator handles standard B2B and B2C scenarios; it does not model margin schemes, the wine equalisation tax, luxury car tax or international reverse charges — talk to a registered tax agent for those edge cases.

Last updated: May 2026. This calculator provides estimates only and should not be treated as financial, tax, or legal advice.

Frequently Asked Questions

Are GST and VAT the same thing?

Functionally yes — both are multi-stage consumption taxes. The terminology differs by country, with VAT used in most of Europe and GST common in Australia, Canada, India, and several Asian countries.

What is the GST rate in my country?

Common rates: Australia 10%, Canada 5% (plus provincial), UK 20%, India 18% (most goods), New Zealand 15%, Singapore 7%. The calculator includes a preset list.

How do I extract VAT from a tax-inclusive total?

Divide the gross by (1 + rate/100) to get the net. The tax is the difference. Example: £120 incl. 20% VAT → £120 / 1.20 = £100 net + £20 VAT.

Are there reduced or zero rates I should know about?

Most countries have reduced rates for essentials like food, books, or children's clothing, and zero-rated categories like exports. Use the custom rate field if you're working with a non-standard rate.

Can a business reclaim GST/VAT it pays?

In most countries, registered businesses can offset GST/VAT they pay on inputs against the GST/VAT they collect on outputs, paying only the difference. This is the "value-added" mechanism.