Add tax vs. remove tax
Use Add tax when your figure is a net, pre-tax price and you want the tax
and gross total. Use Remove tax when your figure already includes tax and
you need the net base — for example to reclaim input VAT or to quote an ex-VAT price. Removing
tax divides by (1 + rate); it is not the same as multiplying by the rate.
How the rates are sourced
Each jurisdiction is a small versioned rate table tagged "Rates as of 2026-06" with a link to
the official tax authority. EU and UK figures are the standard, reduced, and zero VAT rates.
US figures are statewide sales-tax base rates — local taxes vary, so treat them as a floor and
verify the combined rate for the exact address.