United Kingdom Sales Tax / VAT Calculator
Add or strip United Kingdom sales tax or VAT at 20% and see the tax, the net price and the tax share of the gross.
About United Kingdom Sales Tax / VAT Calculator
Tax is applied to the net price, so the gross is the net multiplied by one plus the rate. Note that tax as a share of the gross is always lower than the headline rate — 20% on net is 16.67% of gross, which is the figure to use when working backwards from a tax-inclusive price. United Kingdom. Quoting the wrong side of a tax-inclusive price is one of the most common invoicing errors, and it compounds across every line of an order.
Formula
United Kingdom Sales Tax / VAT
Tax = net price × rate ÷ 100; gross = net + tax
- net price
- Price before tax is applied
- rate
- Statutory tax rate as a percentage
Worked example
With the default values below, United Kingdom Sales Tax / VAT Calculator returns Total Including Tax of £120.00. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Price before taxminimum 0 GBP
- 100 GBP
- United Kingdom VAT or sales tax rateaccepts 0–100 %
- 20 %
- Quantityminimum 1
- 1
Results
- Total Including Tax
- £120.00
- Tax Amount
- £20.00
- Total Excluding Tax
- £100.00
- Tax per Unit
- £20.00
- Tax as Share of Gross
- 16.67%
Step by step
- 1Values used
- 2United Kingdom Sales Tax / VAT
- 3Total Including Tax= 120.00
- 4Tax Amount= 20.00
- 5Total Excluding Tax= 100.00
- 6Tax per Unit= 20.00
- 7Tax as Share of Gross= 16.67
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is United Kingdom Sales Tax / VAT calculated?
Tax = net price × rate ÷ 100; gross = net + tax Tax is applied to the net price, so the gross is the net multiplied by one plus the rate. Note that tax as a share of the gross is always lower than the headline rate — 20% on net is 16.67% of gross, which is the figure to use when working backwards from a tax-inclusive price.
Why does United Kingdom Sales Tax / VAT matter?
United Kingdom. Quoting the wrong side of a tax-inclusive price is one of the most common invoicing errors, and it compounds across every line of an order.
What values do I need to enter?
This calculator takes 3 inputs: Price before tax, United Kingdom VAT or sales tax rate, Quantity. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.
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United Kingdom specifics
- Currency
- £ GBPBritish Pound
- Region
- Europe
- Country code
- GB
- Amounts look like
- £1,234,567.89
- Dates look like
- 9 Mar 2026
- Units
- metricWeek starts Monday
Results on this page are expressed in GBP (British Pound). Figures are estimates for general planning — confirm current rates and thresholds with the relevant United Kingdom authority before relying on them.
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