Adding or removing VAT from a price is simple in theory but easy to get wrong under pressure – especially removing VAT from a gross figure, which isn’t just subtracting 20%.

This calculator handles both directions instantly: add VAT to a net price for a quote, or work out the VAT-exclusive figure from a gross amount on a receipt or invoice. It covers the standard, reduced and zero rates that come up most often when quoting plumbing jobs and materials.