diff --git a/modules/account/tax.py b/modules/account/tax.py
index 5dd420f98f..15a162c2a2 100644
--- a/modules/account/tax.py
+++ b/modules/account/tax.py
@@ -1307,14 +1307,20 @@ class TaxableMixin(object):
                         if self.currency:
                             taxline['base'] = self.currency.round(
                                 taxline['base'])
-                        if taxline not in taxes:
-                            taxes[taxline] = taxline
+                        if taxline not in current_taxes:
+                            current_taxes[taxline] = taxline
                         else:
-                            taxes[taxline]['base'] += taxline['base']
-                            taxes[taxline]['amount'] += taxline['amount']
-                        current_taxes[taxline] = taxes[taxline]
+                            current_taxes[taxline]['base'] += taxline['base']
+                            current_taxes[taxline]['amount'] += (
+                                taxline['amount'])
                     if tax_rounding == 'line':
                         self._round_taxes(current_taxes)
+                    for key, taxline in current_taxes.items():
+                        if key not in taxes:
+                            taxes[key] = taxline
+                        else:
+                            taxes[key]['base'] += taxline['base']
+                            taxes[key]['amount'] += taxline['amount']
                 if tax_rounding == 'document':
                     self._round_taxes(taxes)
                 for key, taxline in taxes.items():
diff --git a/modules/account/tests/test_module.py b/modules/account/tests/test_module.py
index e7cef7d2df..f5f0dea74a 100644
--- a/modules/account/tests/test_module.py
+++ b/modules/account/tests/test_module.py
@@ -1143,6 +1143,38 @@ class AccountTestCase(
         self.assertEqual(tax['base'], Decimal('100.00'))
         self.assertEqual(tax['amount'], Decimal('20.00'))
 
+    @with_transaction()
+    def test_taxable_mixin_line2(self):
+        "Test TaxableMixin with rounding on line"
+        pool = Pool()
+        Tax = pool.get('account.tax')
+        Configuration = pool.get('account.configuration')
+        currency = create_currency('cur')
+
+        company = create_company()
+        with set_company(company):
+            create_chart(company, tax=True)
+            tax, = Tax.search([])
+            tax.rate = 1
+            tax.save()
+            config = Configuration(1)
+            config.tax_rounding = 'line'
+            config.save()
+
+            taxable = self.Taxable(
+                currency=currency,
+                taxable_lines=[
+                    ([tax], Decimal('1.070'), 1, None),
+                    ([tax], Decimal('1.005'), 1, None),
+                    ],
+                company=company)
+
+            taxes = taxable._get_taxes()
+
+        tax, = taxes
+        self.assertEqual(tax['base'], Decimal('2.07'))
+        self.assertEqual(tax['amount'], Decimal('2.07'))
+
     @with_transaction()
     def test_taxable_mixin_document(self):
         "Test TaxableMixin with rounding on document"