VAT Calculator
Add or remove VAT, GST or sales tax to see the gross, net and tax — one-click rates for Korea, UK, Germany, France, Netherlands, Italy, Japan and Singapore.
Add tax (net → gross)
Gross amount (with tax): 120 Tax: 20
Remove tax (gross → net)
Net amount (before tax): 100 Tax: 20
Find rate (net + gross → rate %)
Tax rate: 20%
Any two values → the other two
Fill in any 2 of these four boxes and the rest are worked out — a tax amount and a rate give the net and the gross.
Plain numbers, no currency.
Add tax to a net amount
Enter a net (tax-exclusive) amount and a tax rate, and the tool instantly shows the gross total and the tax portion. If you do not know the rate, the buttons above the fields fill in the standard ones people most often need: Korea 10%, the UK 20%, Germany 19%, France 20%, the Netherlands 21%, Italy 22%, Japan 10% and Singapore 9%. The buttons are not a complete tax table; any other rate can be typed in by hand. Amounts are shown with thousands separators, so six-figure amounts stay easy to read.
Remove tax from a gross amount
Already have a tax-inclusive total? The second section works backwards using net = gross ÷ (1 + rate ÷ 100) to reveal the original net amount and how much of the total was tax. A preset button sets the rate in both sections at once, so the two halves cannot quietly disagree. Displayed figures are rounded to two decimals for readability while the calculation underneath keeps full precision.
Find the rate from two amounts
The third section takes a net and a gross and gives the rate between them: rate = (gross − net) ÷ net × 100. That is the section for checking a receipt whose tax line looks wrong, or for working out which rate a supplier actually applied. A gross below the net is named as such rather than answered with a negative rate, since on a receipt that almost always means the two figures went into each other's box. Everything uses plain numbers with no currency, so the same calculator works for VAT, GST or any sales tax anywhere — read the result in whatever units you entered. Copy link hands over the calculation as it stands, and Start over puts every box back to how the page opened.
What VAT is, and how it differs from a sales tax
Value-added tax is a tax on spending that is collected in stages. Each business in a supply chain charges it on what it sells and reclaims the VAT it paid on what it bought, so each one hands over only the tax on the value it added; the whole of it ends up in the price the final customer pays, and that customer is the one who bears it. A sales tax reaches the same shopper another way: it is charged once, at the final sale, and nobody earlier in the chain handles it. GST — goods and services tax — is the same staged mechanism under another name. A price with the tax in it is the gross, or tax-inclusive, price, which is what shelf tickets show in most countries with VAT; a price before the tax is the net, or tax-exclusive, one, which is how business invoices often state it. Rates are set by each country and often differ by item, with reduced or zero rates for things such as food or books, so check the rate that applies to what you are pricing.
Frequently asked questions
How do you add VAT to a net price?
Tax = net × rate ÷ 100, and gross = net + tax. For example, adding 20% to 100 gives 20 in tax and 120 gross.
How do you remove VAT from a gross total?
Net = gross ÷ (1 + rate ÷ 100). With a 20% rate, a gross of 120 divides by 1.2 to give a net of 100, so the tax was 20. Taking 20% off the gross does not give the right answer, which is why this reverse formula is used.
I know the two amounts but not the rate — can I work it out?
Yes, that is the third section: rate = (gross − net) ÷ net × 100. A net of 100 and a gross of 122 gives 22%. Use it to check a receipt whose tax line looks wrong, or to identify the rate a supplier applied.
Which rates do the preset buttons use?
The standard rate for each country, checked against the tax authority in August 2026: KR 10%, UK 20%, DE 19%, FR 20%, NL 21%, IT 22%, JP 10%, SG 9%. Reduced rates — Japan charges 8% on groceries and newspapers, for instance — are not included, since which goods qualify is a question no calculator can answer for you. Type the rate in yourself for those.
What if I only know the gross price and the tax amount?
Use the block that works from any pair of values: fill in the ones you know — rate, net, gross or tax amount — and it works out the rest, saying so when the values you gave cannot go together.
Can I send the calculation to someone, or start over?
Yes. Copy link under the four blocks hands over the calculation as it stands — every box that differs from how the page opens rides in the link — and "Start over" puts all the boxes back to their opening values and lets go of the pressed rate.
What if the gross ends up in the net box by mistake?
“Find rate” says so. When the gross is below the net it shows “The gross amount is below the net — that would be a negative tax.” instead of a negative rate, because on a receipt that almost always means the two figures went into each other’s box. The block that works from any pair of values gives the same message for the same pair, and an equal net and gross still answers 0%.