Choose the task first
Use VAT Calculator for a single price, Reverse VAT for a price that already includes tax, and Invoice Calculator for several lines. Choose Threshold for a rolling turnover comparison, Flat Rate for a scheme payment estimate, and Margin Scheme for a qualifying individual resale.
Prepare inputs before typing
Check whether the amount is net or gross. Read the rate from your transaction evidence rather than selecting the default automatically. For margin and profit tools, gather both purchase cost and selling price. Keep all values in pounds and use a decimal point for pence.
Read the breakdown
Each tool displays labelled results and a short calculation explanation. Change one input at a time to understand its effect. On the interactive price graphic, the net £100 stays fixed as the illustrative tax rate changes; this makes the relationship between net, VAT and gross visible.
Use and verify the result
Copy the figures into your own worksheet or accounting process. Reloading resets the calculator, and no submission is made to HMRC. For a manual check, follow the worked example on the calculator post. Blank or invalid inputs clear the result rather than keeping an old answer visible.
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.
Keep learning
Educational information and estimates. These tools do not submit VAT returns or determine the treatment of a specific transaction.