diff --git a/management/commands/check_consistency.py b/management/commands/check_consistency.py
new file mode 100644
index 0000000..67a40fb
--- /dev/null
+++ b/management/commands/check_consistency.py
@@ -0,0 +1,39 @@
+# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.core.management import BaseCommand
+from django.db.models import Sum, F
+
+from note.models import Note, Transaction
+from note.templatetags.pretty_money import pretty_money
+
+
+class Command(BaseCommand):
+    def add_arguments(self, parser):
+        parser.add_argument('--sum-all', '-s', action='store_true', help='Check if the global sum is equal to zero')
+
+    def handle(self, *args, **options):
+        if options["sum_all"]:
+            s = Note.objects.aggregate(Sum("balance"))["balance__sum"]
+            if s:
+                self.stderr.write(self.style.NOTICE("LA SOMME DES NOTES NE VAUT PAS ZÉRO : " + pretty_money(s)))
+                exit(-1)
+            else:
+                self.stdout.write(self.style.SUCCESS("La somme des notes vaut bien zéro."))
+                exit(0)
+
+        error = False
+        for note in Note.objects.all():
+            balance = note.balance
+            incoming = Transaction.objects.filter(valid=True, destination=note)\
+                .annotate(total=F("quantity") * F("amount")).aggregate(Sum("total"))["total__sum"] or 0
+            outcoming = Transaction.objects.filter(valid=True, source=note)\
+                .annotate(total=F("quantity") * F("amount")).aggregate(Sum("total"))["total__sum"] or 0
+            expected_balance = incoming - outcoming
+            if expected_balance != balance:
+                self.stderr.write(self.style.NOTICE("LA SOMME DES TRANSACTIONS DE LA NOTE {} NE CORRESPOND PAS "
+                                                    "AVEC LE MONTANT RÉEL".format(str(note))))
+                self.stderr.write(self.style.NOTICE("Attendu : {}, calculé : {}"
+                                                    .format(pretty_money(balance), pretty_money(expected_balance))))
+                error = True
+        exit(1 if error else 0)