diff --git a/addons/point_of_sale/models/account_tax.py b/addons/point_of_sale/models/account_tax.py
index 0c8978bac0e..e53b132265e 100644
--- a/addons/point_of_sale/models/account_tax.py
+++ b/addons/point_of_sale/models/account_tax.py
@@ -18,7 +18,7 @@ class AccountTax(models.Model):
                 ('order_id.session_id.state', '!=', 'closed')
             ])
             self_ids = set(self.ids)
-            for lines_chunk in map(self.env['pos.order.line'].browse, split_every(100000, lines.ids)):
+            for lines_chunk in map(self.env['pos.order.line'].sudo().browse, split_every(100000, lines.ids)):
                 if any(tid in self_ids for ts in lines_chunk.read(['tax_ids']) for tid in ts['tax_ids']):
                     raise UserError(_(
                         'It is forbidden to modify a tax used in a POS order not posted. '