diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index 56af04776a7..34025b9af78 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -638,7 +638,7 @@ class AccountMove(models.Model):
                     'grouping_dict': False,
                 })
                 taxes_map_entry['amount'] += tax_vals['amount']
-                taxes_map_entry['tax_base_amount'] += tax_vals['base']
+                taxes_map_entry['tax_base_amount'] += self._get_base_amount_to_display(tax_vals['base'], tax_repartition_line)
                 taxes_map_entry['grouping_dict'] = grouping_dict
             line.tax_exigible = tax_exigible
 
@@ -657,9 +657,8 @@ class AccountMove(models.Model):
                     self.line_ids -= taxes_map_entry['tax_line']
                 continue
 
-            tax_base_amount = (-1 if self.is_inbound() else 1) * taxes_map_entry['tax_base_amount']
             # tax_base_amount field is expressed using the company currency.
-            tax_base_amount = currency._convert(tax_base_amount, self.company_currency_id, self.company_id, self.date or fields.Date.context_today(self))
+            tax_base_amount = currency._convert(taxes_map_entry['tax_base_amount'], self.company_currency_id, self.company_id, self.date or fields.Date.context_today(self))
 
             # Recompute only the tax_base_amount.
             if taxes_map_entry['tax_line'] and recompute_tax_base_amount:
@@ -704,6 +703,16 @@ class AccountMove(models.Model):
             if in_draft_mode:
                 taxes_map_entry['tax_line'].update(taxes_map_entry['tax_line']._get_fields_onchange_balance(force_computation=True))
 
+    @api.model
+    def _get_base_amount_to_display(self, base_amount, tax_rep_ln):
+        """ The base amount returned for taxes by compute_all has is the balance
+        of the base line. For inbound operations, positive sign is on credit, so
+        we need to invert the sign of this amount before displaying it.
+        """
+        if tax_rep_ln.invoice_tax_id.type_tax_use == 'sale' or tax_rep_ln.refund_tax_id.type_tax_use == 'purchase':
+            return -base_amount
+        return base_amount
+
     def update_lines_tax_exigibility(self):
         if all(account.user_type_id.type not in {'payable', 'receivable'} for account in self.mapped('line_ids.account_id')):
             self.line_ids.write({'tax_exigible': True})
diff --git a/addons/account/tests/test_invoice_taxes.py b/addons/account/tests/test_invoice_taxes.py
index 247f85a4849..756117e2cbb 100644
--- a/addons/account/tests/test_invoice_taxes.py
+++ b/addons/account/tests/test_invoice_taxes.py
@@ -322,9 +322,9 @@ class TestInvoiceTaxes(AccountTestInvoicingCommon):
         move = move_form.save()
 
         self.assertRecordValues(move.line_ids.sorted('balance'), [
-            {'balance': -1100.0,    'tax_ids': [],              'tax_tag_ids': []},
-            {'balance': 100.0,      'tax_ids': [],              'tax_tag_ids': self.tax_tag_neg.ids},
-            {'balance': 1000.0,     'tax_ids': sale_tax.ids,    'tax_tag_ids': self.base_tag_neg.ids},
+            {'balance': -1100.0,    'tax_ids': [],              'tax_tag_ids': [],                      'tax_base_amount': 0},
+            {'balance': 100.0,      'tax_ids': [],              'tax_tag_ids': self.tax_tag_neg.ids,    'tax_base_amount': 1000},
+            {'balance': 1000.0,     'tax_ids': sale_tax.ids,    'tax_tag_ids': self.base_tag_neg.ids,   'tax_base_amount': 0},
         ])
 
         # === Tax in credit ===
@@ -412,9 +412,9 @@ class TestInvoiceTaxes(AccountTestInvoicingCommon):
         move = move_form.save()
 
         self.assertRecordValues(move.line_ids.sorted('balance'), [
-            {'balance': -1100.0,    'tax_ids': [],              'tax_tag_ids': []},
-            {'balance': 100.0,      'tax_ids': [],              'tax_tag_ids': self.tax_tag_pos.ids},
-            {'balance': 1000.0,     'tax_ids': purch_tax.ids,   'tax_tag_ids': self.base_tag_pos.ids},
+            {'balance': -1100.0,    'tax_ids': [],              'tax_tag_ids': [],                      'tax_base_amount': 0},
+            {'balance': 100.0,      'tax_ids': [],              'tax_tag_ids': self.tax_tag_pos.ids,    'tax_base_amount': 1000},
+            {'balance': 1000.0,     'tax_ids': purch_tax.ids,   'tax_tag_ids': self.base_tag_pos.ids,   'tax_base_amount': 0},
         ])
 
         # === Tax in credit ===
diff --git a/addons/hr_expense/models/hr_expense.py b/addons/hr_expense/models/hr_expense.py
index bbe63e03c50..5702e84f4cd 100644
--- a/addons/hr_expense/models/hr_expense.py
+++ b/addons/hr_expense/models/hr_expense.py
@@ -441,6 +441,13 @@ Or send your receipts at <a href="mailto:%(email)s?subject=Lunch%%20with%%20cust
             for tax in taxes['taxes']:
                 balance = expense.currency_id._convert(tax['amount'], company_currency, expense.company_id, account_date)
                 amount_currency = tax['amount']
+
+                if tax['tax_repartition_line_id']:
+                    rep_ln = self.env['account.tax.repartition.line'].browse(tax['tax_repartition_line_id'])
+                    base_amount = self.env['account.move']._get_base_amount_to_display(tax['base'], rep_ln)
+                else:
+                    base_amount = None
+
                 move_line_tax_values = {
                     'name': tax['name'],
                     'quantity': 1,
@@ -450,7 +457,7 @@ Or send your receipts at <a href="mailto:%(email)s?subject=Lunch%%20with%%20cust
                     'account_id': tax['account_id'] or move_line_src['account_id'],
                     'tax_repartition_line_id': tax['tax_repartition_line_id'],
                     'tax_tag_ids': tax['tag_ids'],
-                    'tax_base_amount': tax['base'],
+                    'tax_base_amount': base_amount,
                     'expense_id': expense.id,
                     'partner_id': partner_id,
                     'currency_id': expense.currency_id.id,