Hello Mark,
Stefan's point is relevant, we (Europeans) usually display prices including VAT.
In Europe personal and business tax rates are the same, they are not different.
When Businesses have provided a valid Tax Id then prices are shown without VAT (respecting EU VAT App rules).
I understand in other countries tax is different depending on the State you live in.
But as long as the tax configuration is correct then it is only a matter of displaying the price selection in the options...
For the display of prices upon preference setting:
1- Show prices including tax
2- Show prices excluding tax
3- Show both
With option 1 or 2 selected the price could be in large font size and on the second line in smaller or muted font "Tax incl." or "without tax"
With option 3 the first line is price included and the second line is price without tax
Examples of display with tax 20% European VAT (in French " htva " means without tax and " tvac " means tax included)
1-
120€
tvac
2-
100€
htva
3-
120€
100€ htva
For countries like USA, customers are used to see prices without tax and tax calculated in the checkout so there should be no issue with the current behavior or the implementation of the advanced display options of tax information...
EDIT:
See how prices are displayed at virtuemart.net
https://extensions.virtuemart.net/checkout/payments/avatax-detail
Sales price 55,10 €
Price excl. VAT: 46,30 €
Tax amount 8,80 €