Thank you for the reply @paul2009.
However, although it may be normal for Squarespace, it is absolutely not normal practice in the UK for showing prices. You EITHER don't show the tax at all (because it's fixed, and everybody has to pay it - it's not like the USA where different states have different taxes), OR you show the ex-VAT price as the subtotal, plus the VAT, and the total is the sum of the two.
Another alternative is to show the total price, and have a separate line at the very bottom that says words to the effect of "Price includes VAT of £x.xx).
The way it's presented by Squarespace is alarming for UK customers who aren't a VAT registered business. People are used to understanding that the price they see advertised is the price they'll pay. So in this example, they (rightly) think they're going to pay £20, and then see something that makes it look as though we're going to add an extra £3.33 to that.
In my initial example with one item with a nice round number price, it's not quite as bad, but if they buy multiple tickets and some merchandise with shipping, and the figures are not nice round numbers, that then looks like
Subtotal: £24.95
Shipping: £3.95
VAT: £4.82
Total: £28.90
There it's much less obvious that you DO add the shipping to the subtotal to get the total, but you DON'T add the VAT.
So, does anybody know if there's a way to suppress the tax line altogether in the invoice?
Thanks