diff --git a/mis_builder/models/aep.py b/mis_builder/models/aep.py
index 94f57d0c2..63a0bc481 100644
--- a/mis_builder/models/aep.py
+++ b/mis_builder/models/aep.py
@@ -12,6 +12,7 @@
 from odoo.tools.safe_eval import datetime, dateutil, safe_eval, time
 
 from .accounting_none import AccountingNone
+from .simple_array import SimpleArray
 
 _logger = logging.getLogger(__name__)
 
@@ -316,7 +317,7 @@ def do_queries(
         aml_model = aml_model.with_context(active_test=False)
         company_rates = self._get_company_rates(date_to)
         # {(domain, mode): {account_id: (debit, credit)}}
-        self._data = defaultdict(dict)
+        self._data = defaultdict(lambda: defaultdict(lambda: SimpleArray((0.0, 0.0))))
         domain_by_mode = {}
         ends = []
         for key in self._map_account_ids:
@@ -364,7 +365,9 @@ def do_queries(
                 ):
                     # in initial mode, ignore accounts with 0 balance
                     continue
-                self._data[key][acc["account_id"][0]] = (debit * rate, credit * rate)
+                # due to branches, it's possible to have multiple acc
+                # with the same account_id
+                self._data[key][acc["account_id"][0]] += (debit * rate, credit * rate)
         # compute ending balances by summing initial and variation
         for key in ends:
             domain, mode = key
diff --git a/mis_builder/readme/newsfragments/648.feature b/mis_builder/readme/newsfragments/648.feature
new file mode 100644
index 000000000..5fd451914
--- /dev/null
+++ b/mis_builder/readme/newsfragments/648.feature
@@ -0,0 +1 @@
+Add support for branch companies.
diff --git a/mis_builder/tests/test_aep.py b/mis_builder/tests/test_aep.py
index 8b325d715..ddc562895 100644
--- a/mis_builder/tests/test_aep.py
+++ b/mis_builder/tests/test_aep.py
@@ -410,3 +410,28 @@ def test_invalid_field(self):
                 datetime.date(self.prev_year, 12, 1),
             )
         assert "Error while querying move line source" in str(cm.exception)
+
+    def test_aep_branch(self):
+        # create branch
+        self.branch = self.res_company.create(
+            {
+                "name": "AEP Branch",
+                "parent_id": self.company.id,
+            }
+        )
+        # create branch move in March this year
+        branch_move = self._create_move(
+            date=datetime.date(self.curr_year, 3, 1),
+            amount=50,
+            debit_acc=self.account_ar,
+            credit_acc=self.account_in,
+        )
+        branch_move.company_id = self.branch
+        self.aep = AEP(self.company | self.branch)
+        self.aep.parse_expr("balp[]")
+        self.aep.done_parsing()
+        self._do_queries(
+            datetime.date(self.curr_year, 3, 1), datetime.date(self.curr_year, 3, 31)
+        )
+        variation = self._eval_by_account_id("balp[]")
+        self.assertEqual(variation, {self.account_ar.id: 550, self.account_in.id: -550})