public static function get_tax_for_display($tax_class)
 {
     $return = false;
     if (fflcommerce_cart::get_tax_amount($tax_class, false) > 0 && fflcommerce_cart::get_tax_rate($tax_class) > 0 || fflcommerce_cart::get_tax_rate($tax_class) !== false) {
         $return = self::$tax->get_tax_class_for_display($tax_class) . ' (' . (double) fflcommerce_cart::get_tax_rate($tax_class) . '%) ';
         // only show estimated tag when customer is on the cart page and no shipping calculator is enabled to be able to change country
         if (!fflcommerce_shipping::show_shipping_calculator() && is_cart()) {
             $return .= '<small>' . sprintf(__('estimated for: %s', 'fflcommerece'), fflcommerce_countries::get_country(fflcommerce_tax::get_customer_country())) . '</small>';
         }
     }
     return $return;
 }