Hello,
Option 1: If you want to show the vat only when customer are registered when you have to edit your tax rule and select the default shopper for example only when the customers are logged in.
Option 2: If you want everyone to see Tax on the cart including anonymous users then you have to create some template overrides for the product details default_showprices.php file, for the category view default.php and for the virtuemanrt frontpage default_product.php file.
For example to create an override for the default_showprices.php file of product details page you will do:
The orinal file is located under joomla_folder\components\com_virtuemart\views\productdetails\tmpl\default_showprices.php. To the override just copy that file inside your_joomla_folder\templates\your_joomla_template\html\com_virtuemart\productdetails\default_showprices.php
if the folders html and com_virtuemart does not exist create them. If the the file already exists on the destination that means that you already use a template override and need to just edit that file.
In that file in line 50 you will find the following :
echo $this->currency->createPriceDiv ('taxAmount', 'COM_VIRTUEMART_PRODUCT_TAX_AMOUNT', $this->product->prices);
Just comment that line and the tax will not be shown in product details page. Do the same with the other files.
Please also read:
Use firebug to examine you site code and css styling:
https://forum.virtuemart.net/index.php?topic=102850.0Creating Template overrides:
https://forum.virtuemart.net/index.php?topic=98505.0Template System:
https://dev.virtuemart.net/projects/virtuemart/wiki/Hints_for_the_use_of_the_template_system