diff --git a/core/migrations/0039_alter_user_managers.py b/core/migrations/0039_alter_user_managers.py
new file mode 100644
index 00000000..3073bbe6
--- /dev/null
+++ b/core/migrations/0039_alter_user_managers.py
@@ -0,0 +1,15 @@
+# Generated by Django 4.2.16 on 2024-10-06 14:52
+
+from django.db import migrations
+
+import core.models
+
+
+class Migration(migrations.Migration):
+    dependencies = [("core", "0038_alter_preferences_receive_weekmail")]
+
+    operations = [
+        migrations.AlterModelManagers(
+            name="user", managers=[("objects", core.models.CustomUserManager())]
+        )
+    ]
diff --git a/core/models.py b/core/models.py
index 646cbca8..36d0902d 100644
--- a/core/models.py
+++ b/core/models.py
@@ -27,15 +27,12 @@ import importlib
 import logging
 import os
 import unicodedata
-from datetime import date, timedelta
+from datetime import timedelta
 from pathlib import Path
-from typing import TYPE_CHECKING, Optional
+from typing import TYPE_CHECKING, Any, Optional, Self
 
 from django.conf import settings
-from django.contrib.auth.models import (
-    AbstractBaseUser,
-    UserManager,
-)
+from django.contrib.auth.models import AbstractBaseUser, UserManager
 from django.contrib.auth.models import (
     AnonymousUser as AuthAnonymousUser,
 )
@@ -51,15 +48,18 @@ from django.core.cache import cache
 from django.core.exceptions import PermissionDenied, ValidationError
 from django.core.mail import send_mail
 from django.db import models, transaction
+from django.db.models import Exists, OuterRef, Q
 from django.urls import reverse
 from django.utils import timezone
 from django.utils.functional import cached_property
 from django.utils.html import escape
+from django.utils.timezone import localdate, now
 from django.utils.translation import gettext_lazy as _
 from phonenumber_field.modelfields import PhoneNumberField
-from pydantic.v1 import NonNegativeInt
 
 if TYPE_CHECKING:
+    from pydantic import NonNegativeInt
+
     from club.models import Club
 
 
@@ -91,15 +91,15 @@ class Group(AuthGroup):
     class Meta:
         ordering = ["name"]
 
-    def get_absolute_url(self):
+    def get_absolute_url(self) -> str:
         return reverse("core:group_list")
 
-    def save(self, *args, **kwargs):
+    def save(self, *args, **kwargs) -> None:
         super().save(*args, **kwargs)
         cache.set(f"sith_group_{self.id}", self)
         cache.set(f"sith_group_{self.name.replace(' ', '_')}", self)
 
-    def delete(self, *args, **kwargs):
+    def delete(self, *args, **kwargs) -> None:
         super().delete(*args, **kwargs)
         cache.delete(f"sith_group_{self.id}")
         cache.delete(f"sith_group_{self.name.replace(' ', '_')}")
@@ -164,9 +164,9 @@ class RealGroup(Group):
         proxy = True
 
 
-def validate_promo(value):
+def validate_promo(value: int) -> None:
     start_year = settings.SITH_SCHOOL_START_YEAR
-    delta = (date.today() + timedelta(days=180)).year - start_year
+    delta = (localdate() + timedelta(days=180)).year - start_year
     if value < 0 or delta < value:
         raise ValidationError(
             _("%(value)s is not a valid promo (between 0 and %(end)s)"),
@@ -174,7 +174,7 @@ def validate_promo(value):
         )
 
 
-def get_group(*, pk: int = None, name: str = None) -> Optional[Group]:
+def get_group(*, pk: int = None, name: str = None) -> Group | None:
     """Search for a group by its primary key or its name.
     Either one of the two must be set.
 
@@ -216,6 +216,31 @@ def get_group(*, pk: int = None, name: str = None) -> Optional[Group]:
     return group
 
 
+class UserQuerySet(models.QuerySet):
+    def filter_inactive(self) -> Self:
+        from counter.models import Refilling, Selling
+        from subscription.models import Subscription
+
+        threshold = now() - settings.SITH_ACCOUNT_INACTIVITY_DELTA
+        subscriptions = Subscription.objects.filter(
+            member_id=OuterRef("pk"), subscription_end__gt=localdate(threshold)
+        )
+        refills = Refilling.objects.filter(
+            customer__user_id=OuterRef("pk"), date__gt=threshold
+        )
+        purchases = Selling.objects.filter(
+            customer__user_id=OuterRef("pk"), date__gt=threshold
+        )
+        return self.exclude(
+            Q(Exists(subscriptions)) | Q(Exists(refills)) | Q(Exists(purchases))
+        )
+
+
+class CustomUserManager(UserManager.from_queryset(UserQuerySet)):
+    # see https://docs.djangoproject.com/fr/stable/topics/migrations/#model-managers
+    pass
+
+
 class User(AbstractBaseUser):
     """Defines the base user class, useable in every app.
 
@@ -373,36 +398,41 @@ class User(AbstractBaseUser):
     )
     godfathers = models.ManyToManyField("User", related_name="godchildren", blank=True)
 
-    objects = UserManager()
+    objects = CustomUserManager()
 
     USERNAME_FIELD = "username"
 
-    def promo_has_logo(self):
-        return Path(
-            settings.BASE_DIR / f"core/static/core/img/promo_{self.promo}.png"
-        ).exists()
-
-    def has_module_perms(self, package_name):
-        return self.is_active
-
-    def has_perm(self, perm, obj=None):
-        return self.is_active and self.is_superuser
-
-    def get_absolute_url(self):
-        return reverse("core:user_profile", kwargs={"user_id": self.pk})
-
     def __str__(self):
         return self.get_display_name()
 
-    def to_dict(self):
-        return self.__dict__
+    def save(self, *args, **kwargs):
+        with transaction.atomic():
+            if self.id:
+                old = User.objects.filter(id=self.id).first()
+                if old and old.username != self.username:
+                    self._change_username(self.username)
+            super().save(*args, **kwargs)
+
+    def get_absolute_url(self) -> str:
+        return reverse("core:user_profile", kwargs={"user_id": self.pk})
+
+    def promo_has_logo(self) -> bool:
+        return Path(
+            settings.BASE_DIR / f"core/static/core/img/promo_{self.promo}.png"
+        ).exists()
+
+    def has_module_perms(self, package_name: str) -> bool:
+        return self.is_active
+
+    def has_perm(self, perm: str, obj: Any = None) -> bool:
+        return self.is_active and self.is_superuser
 
     @cached_property
-    def was_subscribed(self):
+    def was_subscribed(self) -> bool:
         return self.subscriptions.exists()
 
     @cached_property
-    def is_subscribed(self):
+    def is_subscribed(self) -> bool:
         s = self.subscriptions.filter(
             subscription_start__lte=timezone.now(), subscription_end__gte=timezone.now()
         )
@@ -542,17 +572,6 @@ class User(AbstractBaseUser):
         )
         return age
 
-    def save(self, *args, **kwargs):
-        create = False
-        with transaction.atomic():
-            if self.id:
-                old = User.objects.filter(id=self.id).first()
-                if old and old.username != self.username:
-                    self._change_username(self.username)
-            else:
-                create = True
-            super().save(*args, **kwargs)
-
     def make_home(self):
         if self.home is None:
             home_root = SithFile.objects.filter(parent=None, name="users").first()
diff --git a/core/tests/test_user.py b/core/tests/test_user.py
index 9794b9f6..5454a302 100644
--- a/core/tests/test_user.py
+++ b/core/tests/test_user.py
@@ -1,15 +1,18 @@
 from datetime import timedelta
 
 import pytest
+from django.conf import settings
 from django.core.management import call_command
 from django.test import Client, TestCase
 from django.urls import reverse
 from django.utils.timezone import now
 from model_bakery import baker, seq
-from model_bakery.recipe import Recipe
+from model_bakery.recipe import Recipe, related
 
-from core.baker_recipes import subscriber_user
+from core.baker_recipes import old_subscriber_user, subscriber_user
 from core.models import User
+from counter.models import Counter, Refilling, Selling
+from subscription.models import Subscription
 
 
 class TestSearchUsers(TestCase):
@@ -111,3 +114,37 @@ def test_user_account_not_found(client: Client):
         )
     )
     assert res.status_code == 404
+
+
+class TestFilterInactive(TestCase):
+    @classmethod
+    def setUpTestData(cls):
+        time_active = now() - settings.SITH_ACCOUNT_INACTIVITY_DELTA + timedelta(days=1)
+        time_inactive = time_active - timedelta(days=3)
+        very_old_subscriber = old_subscriber_user.extend(
+            subscriptions=related(Recipe(Subscription, subscription_end=time_inactive))
+        )
+        counter, seller = baker.make(Counter), baker.make(User)
+        sale_recipe = Recipe(
+            Selling,
+            counter=counter,
+            club=counter.club,
+            seller=seller,
+            is_validated=True,
+        )
+
+        cls.users = [
+            baker.make(User),
+            subscriber_user.make(),
+            old_subscriber_user.make(),
+            *very_old_subscriber.make(_quantity=3),
+        ]
+        sale_recipe.make(customer=cls.users[3].customer, date=time_active)
+        baker.make(
+            Refilling, customer=cls.users[4].customer, date=time_active, counter=counter
+        )
+        sale_recipe.make(customer=cls.users[5].customer, date=time_inactive)
+
+    def test_filter_inactive(self):
+        res = User.objects.filter(id__in=[u.id for u in self.users]).filter_inactive()
+        assert list(res) == [self.users[0], self.users[5]]
diff --git a/counter/views.py b/counter/views.py
index 50bf02b0..e5a64bf1 100644
--- a/counter/views.py
+++ b/counter/views.py
@@ -16,6 +16,7 @@ import re
 from datetime import datetime, timedelta
 from datetime import timezone as tz
 from http import HTTPStatus
+from typing import TYPE_CHECKING
 from urllib.parse import parse_qs
 
 from django import forms
@@ -49,7 +50,6 @@ from django.views.generic.edit import (
 )
 
 from accounting.models import CurrencyField
-from core.models import User
 from core.utils import get_semester_code, get_start_of_semester
 from core.views import CanEditMixin, CanViewMixin, TabedViewMixin
 from core.views.forms import LoginForm
@@ -78,6 +78,9 @@ from counter.models import (
 )
 from counter.utils import is_logged_in_counter
 
+if TYPE_CHECKING:
+    from core.models import User
+
 
 class CounterAdminMixin(View):
     """Protect counter admin section."""
diff --git a/sith/settings.py b/sith/settings.py
index cd70f49b..a4eca6b3 100644
--- a/sith/settings.py
+++ b/sith/settings.py
@@ -40,6 +40,7 @@ import sys
 from pathlib import Path
 
 import sentry_sdk
+from dateutil.relativedelta import relativedelta
 from django.utils.translation import gettext_lazy as _
 from sentry_sdk.integrations.django import DjangoIntegration
 
@@ -495,6 +496,9 @@ SITH_ECOCUP_LIMIT = 3
 # Defines pagination for cash summary
 SITH_COUNTER_CASH_SUMMARY_LENGTH = 50
 
+SITH_ACCOUNT_INACTIVITY_DELTA = relativedelta(years=2)
+"""Time before which a user account is considered inactive"""
+
 # Defines which product type is the refilling type, and thus increases the account amount
 SITH_COUNTER_PRODUCTTYPE_REFILLING = 3