VAT Calculator

What this calculator does

This calculator handles Value Added Tax on a price. It adds VAT to a net amount or removes VAT from a gross amount, and it shows the net amount, the VAT amount and the gross amount side by side. It includes presets for several common standard VAT rates and a Custom field for any other rate. The results update live as you type, and all of the arithmetic is done locally in your browser with nothing sent anywhere.

Why you might need it

VAT sits on most goods and services in countries that operate it, and switching between VAT-inclusive and VAT-exclusive figures is a daily task for many people. A freelancer quoting a client may know the net fee and need the gross figure to put on an invoice. A shopper holding a receipt may want to know how much VAT was included. A bookkeeper reconciling accounts needs the net and VAT split out for a return. Each of these is a small calculation, but doing it repeatedly by hand — and especially removing VAT correctly — invites errors, so a dedicated tool is faster and more reliable.

How to use it

1. Choose a mode: “Add VAT” if your amount is the net price, or “Remove VAT” if your amount already includes VAT.
2. Enter the amount. The field label changes to “Net amount” or “Gross amount” to match your chosen mode.
3. Select a VAT rate from the preset buttons, or pick Custom and type the exact rate you need.
4. Optionally change the currency — it defaults to GBP.
5. Read the three results — net, VAT and gross — and copy the VAT amount with one click if you need it.

How it’s calculated

VAT is a straightforward percentage of the net price. In Add mode the amount you enter is the net value, so the gross is net × (1 + rate/100) and the VAT is the difference between the gross and the net. In Remove mode the amount is the gross value, which already contains VAT, so the net is recovered by division: net = gross ÷ (1 + rate/100). The VAT is once again the difference between the two. Division — not subtraction — is the correct way to strip VAT from an inclusive price, and the calculator applies it automatically.

Common pitfalls

The most frequent mistake is removing VAT by simply subtracting the rate from the gross price; that overstates the deduction because VAT was levied on the smaller net amount. Another pitfall is assuming a single rate applies everywhere — VAT rates differ by country and many items qualify for reduced or zero rates, so always use the rate that applies to your specific case. Also be clear about whether a quoted price is stated inclusive or exclusive of VAT before you start.

Tips

When you produce invoices, work in Add mode so you can show the net, the VAT and the gross explicitly. When you audit a receipt or expense, use Remove mode to see the VAT element. For reduced-rate or zero-rate goods, type the appropriate figure into the Custom field. If you handle prices in more than one currency, switch the dropdown — the percentage logic is identical, so the same tool covers every case.