diff --git a/kfet/forms.py b/kfet/forms.py
index 963e4254..26774b1c 100644
--- a/kfet/forms.py
+++ b/kfet/forms.py
@@ -296,17 +296,17 @@ class KPsulAccountForm(forms.ModelForm):
 
 class KPsulCheckoutForm(forms.Form):
     checkout = forms.ModelChoiceField(
-        queryset=(
-            Checkout.objects
-            .filter(
-                is_protected=False,
-                valid_from__lte=timezone.now(),
-                valid_to__gte=timezone.now(),
-            )
-        ),
+        queryset=None,
         widget=forms.Select(attrs={'id': 'id_checkout_select'}),
     )
 
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        # Create the queryset on form instanciation to use the current time.
+        self.fields['checkout'].queryset = (
+            Checkout.objects.is_valid().filter(is_protected=False))
+
 
 class KPsulOperationForm(forms.ModelForm):
     article = forms.ModelChoiceField(
diff --git a/kfet/models.py b/kfet/models.py
index deee76eb..c9de48bc 100644
--- a/kfet/models.py
+++ b/kfet/models.py
@@ -341,6 +341,13 @@ class AccountNegative(models.Model):
         return self.start + kfet_config.overdraft_duration
 
 
+class CheckoutQuerySet(models.QuerySet):
+
+    def is_valid(self):
+        now = timezone.now()
+        return self.filter(valid_from__lte=now, valid_to__gte=now)
+
+
 class Checkout(models.Model):
     created_by = models.ForeignKey(
         Account, on_delete = models.PROTECT,
@@ -353,6 +360,8 @@ class Checkout(models.Model):
         default = 0)
     is_protected = models.BooleanField(default = False)
 
+    objects = CheckoutQuerySet.as_manager()
+
     def get_absolute_url(self):
         return reverse('kfet.checkout.read', kwargs={'pk': self.pk})
 
diff --git a/kfet/tests/test_forms.py b/kfet/tests/test_forms.py
new file mode 100644
index 00000000..e946d39d
--- /dev/null
+++ b/kfet/tests/test_forms.py
@@ -0,0 +1,48 @@
+import datetime
+from unittest import mock
+
+from django.test import TestCase
+from django.utils import timezone
+
+from kfet.forms import KPsulCheckoutForm
+from kfet.models import Checkout
+
+from .utils import create_user
+
+
+class KPsulCheckoutFormTests(TestCase):
+
+    def setUp(self):
+        self.now = timezone.now()
+
+        user = create_user()
+
+        self.c1 = Checkout.objects.create(
+            name='C1', balance=10,
+            created_by=user.profile.account_kfet,
+            valid_from=self.now,
+            valid_to=self.now + datetime.timedelta(days=1),
+        )
+
+        self.form = KPsulCheckoutForm()
+
+    def test_checkout(self):
+        checkout_f = self.form.fields['checkout']
+        self.assertListEqual(list(checkout_f.choices), [
+            ('', '---------'),
+            (self.c1.pk, 'C1'),
+        ])
+
+    @mock.patch('django.utils.timezone.now')
+    def test_checkout_valid(self, mock_now):
+        """
+        Checkout are filtered using the current datetime.
+        Regression test for #184.
+        """
+        self.now += datetime.timedelta(days=2)
+        mock_now.return_value = self.now
+
+        form = KPsulCheckoutForm()
+
+        checkout_f = form.fields['checkout']
+        self.assertListEqual(list(checkout_f.choices), [('', '---------')])