Hi,
since there are several scenarios about Taxation in the Virtuemart. It is all about the "configuration" of hide or show the prices through VM Configuration depends on what you have in your Virtuemart;
1- If you have a "TAX" rule that is applied to all products regardless of the "shipping location", then you will need different configuration,
2- if you have a TAX rule that is applied to all products depends on the "shipping location", then you will have different configuration.
3- And if you don't have the TAX rule at all, then you will need different configuration.
So basically play around with those 2 parameters as you see in the screenshots, change them until you get what works for you case.
Cheers.