I'm trying to set tax rates to 0% for a specific customer group ('business'). I configured all tax rates to apply only for customer group 'private', and set a new tax rate to 0% for group 'business'.

In the product view and the search, products are correctly shown with 0% tax. But after adding a product to the cart, it shows up with regular tax rates.

Do you have any idea of what I might be doing wrong? I disabled the automatic group change based on VAT id..

Thank you in advance

  • 1
    Are you adding the product to the cart while logged in or as a guest? The same question applies to browsing the catalog. If you are logged in, which user group is your customer account associated with?
    – Vinai
    Jun 14, 2013 at 16:37

1 Answer 1


You might find the solution in the function Mage_Sales_Model_Quote_Item::setProduct here it appears to add the customer group to the product before getting the tax class from the product.

if ($this->getQuote()) {
$this->setData('product', $product)
  • dont fully get what this means. bug?
    – Felix
    Dec 9, 2017 at 16:50

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