diff --git a/addons/hr_timesheet_invoice/wizard/hr_timesheet_invoice_create.py b/addons/hr_timesheet_invoice/wizard/hr_timesheet_invoice_create.py
index 76314e1986a..f8c1c3d3149 100644
--- a/addons/hr_timesheet_invoice/wizard/hr_timesheet_invoice_create.py
+++ b/addons/hr_timesheet_invoice/wizard/hr_timesheet_invoice_create.py
@@ -115,7 +115,10 @@ class account_analytic_line(osv.osv):
                 else:
                     price = 0.0
 
-                taxes = product.taxes_id
+                if product.taxes_id:
+                    taxes = product.taxes_id
+                else:
+                    taxes = product.categ_id.taxes_id
                 tax = fiscal_pos_obj.map_tax(cr, uid, account.partner_id.property_account_position, taxes)
                 account_id = product.product_tmpl_id.property_account_income.id or product.categ_id.property_account_income_categ.id
                 if not account_id:
diff --git a/addons/point_of_sale/point_of_sale.py b/addons/point_of_sale/point_of_sale.py
index 690d371e9db..6871f072cfd 100644
--- a/addons/point_of_sale/point_of_sale.py
+++ b/addons/point_of_sale/point_of_sale.py
@@ -1108,7 +1108,10 @@ class pos_order_line(osv.osv):
         account_tax_obj = self.pool.get('account.tax')
         cur_obj = self.pool.get('res.currency')
         for line in self.browse(cr, uid, ids, context=context):
-            taxes = line.product_id.taxes_id
+            if line.product_id.taxes_id:
+                taxes = line.product_id.taxes_id
+            else:
+                taxes = line.product_id.categ_id.taxes_id
             price = line.price_unit * (1 - (line.discount or 0.0) / 100.0)
             taxes = account_tax_obj.compute_all(cr, uid, line.product_id.taxes_id, price, line.qty, product=line.product_id, partner=line.order_id.partner_id or False)
 
diff --git a/addons/sale/sale.py b/addons/sale/sale.py
index c525ba04df1..ed5ac3d43f6 100644
--- a/addons/sale/sale.py
+++ b/addons/sale/sale.py
@@ -1382,7 +1382,10 @@ class sale_order_line(osv.osv):
         fpos = fiscal_position and self.pool.get('account.fiscal.position').browse(cr, uid, fiscal_position) or False
         if update_tax: #The quantity only have changed
             result['delay'] = (product_obj.sale_delay or 0.0)
-            result['tax_id'] = self.pool.get('account.fiscal.position').map_tax(cr, uid, fpos, product_obj.taxes_id)
+            if product_obj.taxes_id:
+                result['tax_id'] = self.pool.get('account.fiscal.position').map_tax(cr, uid, fpos, product_obj.taxes_id)
+            else:
+                result['tax_id'] = self.pool.get('account.fiscal.position').map_tax(cr, uid, fpos, product_obj.categ_id.taxes_id)
             result.update({'type': product_obj.procure_method})
 
         if not flag:
diff --git a/addons/stock/stock.py b/addons/stock/stock.py
index b770712429c..7b65cc99847 100644
--- a/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@ -915,9 +915,16 @@ class stock_picking(osv.osv):
         @return: Taxes Ids for the move line
         """
         if type in ('in_invoice', 'in_refund'):
-            taxes = move_line.product_id.supplier_taxes_id
+            if product_id.supplier_taxes_id:
+                taxes = move_line.product_id.supplier_taxes_id
+            else:
+                taxes = move_line.product_id.categ_id.supplier_taxes_id
         else:
-            taxes = move_line.product_id.taxes_id
+             if product_id.taxes_id:
+                taxes = move_line.product_id.taxes_id
+             else:
+                taxes = move_line.product_id.categ_id.taxes_id
+ 
 
         if move_line.picking_id and move_line.picking_id.partner_id and move_line.picking_id.partner_id.id:
             return self.pool.get('account.fiscal.position').map_tax(