diff --git a/addons/account_voucher/account_voucher.py b/addons/account_voucher/account_voucher.py
index 3b0bfe80ba4..4b19ae6b824 100644
--- a/addons/account_voucher/account_voucher.py
+++ b/addons/account_voucher/account_voucher.py
@@ -367,7 +367,7 @@ class account_voucher(osv.osv):
                         \n* The \'Posted\' status is used when user create voucher,a voucher number is generated and voucher entries are created in account \
                         \n* The \'Cancelled\' status is used when user cancel voucher.'),
         'amount': fields.float('Total', digits_compute=dp.get_precision('Account'), required=True, readonly=True, states={'draft':[('readonly',False)]}),
-        'tax_amount':fields.float('Tax Amount', digits_compute=dp.get_precision('Account'), readonly=True, states={'draft':[('readonly',False)]}),
+        'tax_amount':fields.float('Tax Amount', digits_compute=dp.get_precision('Account'), readonly=True),
         'reference': fields.char('Ref #', size=64, readonly=True, states={'draft':[('readonly',False)]}, help="Transaction reference number."),
         'number': fields.char('Number', size=32, readonly=True,),
         'move_id':fields.many2one('account.move', 'Account Entry'),