VAT calculator: add or remove VAT

What this tool does

It does the two VAT sums people get wrong most often. Add VAT turns a price without VAT (net) into the price a customer pays (gross). Remove VAT takes a price that already includes VAT and splits it into the net price and the VAT inside it. You get net, VAT and gross side by side, the formula used, and a one-click copy of the result. Choose a preset for Vietnam, the United Kingdom or an EU country, or type any rate with up to four decimals.

How to use it

1. Choose Add VAT or Remove VAT.
2. Type the price. 1,100,000, 1.100.000 and 99.99 or 99,99 are all read correctly, and amounts are kept in the smallest unit of the currency (whole dong for VND, cents for USD, EUR and GBP).
3. Pick a country and rate, or type a rate yourself: the preset then shows "Another rate".
4. Pick a currency to see the right symbol and decimals, then copy the three lines if you need them in an invoice or an email.

Adding and removing are not mirror images

Adding VAT multiplies: at 10%, a net price of 1,000,000 has 100,000 of VAT and a gross price of 1,100,000. Removing VAT divides: the net is the gross divided by 1.10, and the VAT is 10/110 of the gross, not 10% of it. Taking 10% of 1,100,000 gives 110,000, which overstates the VAT by 10,000 and understates the net price by the same amount. At 20% the error is bigger: in a price of 120.00 the VAT is 20.00 (20/120 of it), while 20% of 120.00 is 24.00. When you remove VAT the tool shows this naive figure and how far off it is, so you can spot the mistake in a spreadsheet or a quote.

Rounding

Every derived amount is rounded half up to the smallest unit, once. When adding, the VAT is rounded and the gross is net plus VAT. When removing, the net is rounded and the VAT is gross minus net. So the three numbers always add up exactly. Example: 99.99 including 20% VAT is 83.325 net, rounded to 83.33, which leaves 16.66 of VAT. Invoicing systems that round per line and then add up can differ from a total rounded once by a unit or two; that is a property of rounding, not an error in either.

Rates and presets (as of 13 October 2026)

• Vietnam: 10% is the standard rate and 5% applies to essential goods and services listed in the VAT law; 0% applies to exported goods and services. Under Resolution 204/2025/QH15 and Decree 174/2025/ND-CP many goods and services that normally take 10% are charged 8% from 1 July 2025 to 31 December 2026. The reduction excludes listed sectors such as telecommunications, banking and insurance, real estate, metals and mining products, and goods subject to special consumption tax. Check the decree's appendices for your product.
• United Kingdom: 20% standard, 5% reduced (for example domestic energy).
• EU examples: Germany 19%, France 20%, Ireland 23%, Hungary 27% (the highest standard rate in the EU). Each country also has reduced rates for some goods.

Rates change. The presets were checked on the date above against public summaries; for a filing or an invoice, confirm the rate with the tax authority or your accountant. To work out a percentage change or a discount use the percentage calculator, and for Vietnamese payroll the salary calculator. The article Adding vs removing VAT: the 10/110 trap has more worked examples.