title: Assign Tax Class to Products
body: <p>I have (what I think is) a simple problem with my Magento tax classes. I have around 400 products in my shop and only 20 of them have a tax class assigned to it. I checked my database and the table &quot;catalog_product_index_price&quot; and all the products with the working tax have tax_class_id = 1 and all the not working ones have tax_class_id = 0.</p>
  <p>So I thought I'll just update every product to <code>tax_class_id = 1</code> and I'm done, but as soon as I re-indexed my prices in the Magento back-end the products got <code>tax_class_id = 0</code> again.</p>
  <p>Somewhere there must be a default, but I can't find it anywhere.</p>