[Jon]

To prevent taxes from being calculated until the user logs in, perform the following (This was done on a 3.5.x store):

Open include/func.php and FIND:

function func_calculate_taxes($products, $customer_info, $shipping_cost, $provider="") {

AFTER ADD:

global $current_area;

FIND:

        $return = array("tax_cost" => 0,
                                        "tax_gst" => 0,
                                        "tax_pst" => 0);

AFTER PUT:

   // WebsiteCM - Don't Show Taxes in the customer area unless we have a customer login
   if ($current_area == "C" && $customer_info['login'] == "") { return $return; }