diff --git a/addons/account/models/account_move_line.py b/addons/account/models/account_move_line.py
index 00161ddb7d0..1a63589d804 100644
--- a/addons/account/models/account_move_line.py
+++ b/addons/account/models/account_move_line.py
@@ -889,6 +889,7 @@ class AccountMoveLine(models.Model):
                     'tax_tag_ids': [(6, 0, line.tax_tag_ids.ids)],
                     'partner_id': line.partner_id.id,
                     'move_id': line.move_id.id,
+                    'display_type': line.display_type,
                 })
             else:
                 line.tax_key = frozendict({'id': line.id})
@@ -933,6 +934,7 @@ class AccountMoveLine(models.Model):
                     'tax_tag_ids': [(6, 0, tax['tag_ids'])],
                     'partner_id': line.move_id.partner_id.id or line.partner_id.id,
                     'move_id': line.move_id.id,
+                    'display_type': line.display_type,
                 }): {
                     'name': tax['name'],
                     'balance': tax['amount'] / rate,
diff --git a/addons/account/tests/test_account_move_line_tax_details.py b/addons/account/tests/test_account_move_line_tax_details.py
index 167b54cf2d3..b34eaba3ac5 100644
--- a/addons/account/tests/test_account_move_line_tax_details.py
+++ b/addons/account/tests/test_account_move_line_tax_details.py
@@ -654,6 +654,47 @@ class TestAccountTaxDetailsReport(AccountTestInvoicingCommon):
         )
         self.assertTotalAmounts(invoice, tax_details)
 
+    def test_round_per_line_update(self):
+        self.env.company.tax_calculation_rounding_method = 'round_per_line'
+
+        tax_8 = self.env['account.tax'].create({
+            'name': "tax_8",
+            'amount_type': 'percent',
+            'amount': 8.0,
+        })
+
+        invoice = self.env['account.move'].create({
+            'move_type': 'out_invoice',
+            'partner_id': self.partner_a.id,
+            'invoice_date': '2019-01-01',
+            'invoice_cash_rounding_id': self.cash_rounding_b.id,
+            'invoice_line_ids': [
+                Command.create({
+                    'name': 'line1',
+                    'account_id': self.company_data['default_account_revenue'].id,
+                    'price_unit': 45.45,
+                    'tax_ids': [Command.set(tax_8.ids)],
+                })
+            ]
+        })
+        invoice.invoice_line_ids.write({"price_unit": 4545})
+
+        base_lines, tax_lines = self._dispatch_move_lines(invoice)
+
+        tax_details = self._get_tax_details()
+        self.assertTaxDetailsValues(
+            tax_details,
+            [
+                {
+                    'base_line_id': base_lines[0].id,
+                    'tax_line_id': tax_lines[0].id,
+                    'base_amount': -4545.0,
+                    'tax_amount': -363.6,
+                },
+            ],
+        )
+        self.assertTotalAmounts(invoice, tax_details)
+
     def test_partitioning_lines_by_moves(self):
         tax_20_affect = self.env['account.tax'].create({
             'name': "tax_20_affect",
diff --git a/addons/account/tests/test_early_payment_discount.py b/addons/account/tests/test_early_payment_discount.py
index 00fe85a6826..4b2720fca1f 100644
--- a/addons/account/tests/test_early_payment_discount.py
+++ b/addons/account/tests/test_early_payment_discount.py
@@ -87,7 +87,8 @@ class TestAccountEarlyPaymentDiscount(AccountTestInvoicingCommon):
             {'display_type': 'epd',             'balance': -100.0},
             {'display_type': 'epd',             'balance': 100.0},
             {'display_type': 'product',         'balance': -1000.0},
-            {'display_type': 'tax',             'balance': -135.0},
+            {'display_type': 'tax',             'balance': -150},
+            {'display_type': 'tax',             'balance': 15.0},
             {'display_type': 'tax',             'balance': -0.05},
             {'display_type': 'payment_term',    'balance': 1135.05},
         ], {