Illustrative estimate. Check the rate and scheme eligibility for your transaction. No amounts are sent by this calculator.
How to use the VAT calculator
Choose Add VAT if your price excludes tax, or Remove VAT if your total already includes it. Enter the amount in pounds and select the rate. The three results separate the original net price, the VAT component and the final gross price. Start with a single transaction; use the invoice tool for lines with different rates.
Worked example: add VAT to £250
At an illustrative 20% rate, £250 × 0.20 = £50 VAT. Add that £50 to £250 to obtain a £300 customer total. To check the result in reverse, choose Remove VAT, enter £300 and keep the 20% rate. The net result returns to £250.
Formula and assumptions
VAT = net × rate ÷ 100. Gross = net × (1 + rate ÷ 100). Net = gross ÷ (1 + rate ÷ 100). Monetary results are displayed to two decimal places. This tool handles a simple price split; it does not determine whether a sale qualifies for a relief or whether input tax is recoverable.
Which rate should I choose?
Use the rate that applies to the actual supply. A numerical result at 0% does not establish that an item is zero-rated, exempt or outside scope. Those are different tax treatments. Check the linked rate guide before preparing an invoice.
One price. Three parts.
Move the rate slider to see how VAT changes a £100 net price.
£100 + £20 VAT = £120 total
This slider explains the arithmetic. It does not determine the legal rate for your sale.
Quick answer
Can I use the result without saving an account?
Yes. Calculations run in your browser. Copy the figures into your own records; refreshing the page resets the inputs.
Keep learning
Official sources
Sources checked: 2026-09-26. Check the official guidance for later changes.
Educational information and estimates. These tools do not submit VAT returns or determine the treatment of a specific transaction.