diff --git a/product_category_tax/models/product_product.py b/product_category_tax/models/product_product.py
index db9d165..7f44f0a 100644
--- a/product_category_tax/models/product_product.py
+++ b/product_category_tax/models/product_product.py
@@ -22,8 +22,14 @@ class ProductProduct(models.Model):
             vals['supplier_taxes_id'] = category.buy_tax_id
         elif template_id:
             template = self.env["product.template"].browse(template_id)
-            category = template.categ_id
-            template.taxes_id = category.sell_tax_id
-            template.supplier_taxes_id = category.buy_tax_id
+            cat = template.categ_id
+            if not cat and self.env.user.company_id.use_parent_categories_to_determine_taxes:
+                while not cat.pos_categ_id and cat.parent_id:
+                    cat = cat.parent_id
+            if cat:
+                template.taxes_id = cat.sell_tax_id
+                template.supplier_taxes_id = cat.buy_tax_id
 
         return super(ProductProduct, self).create(vals)
+
+