diff --git a/kfet/forms.py b/kfet/forms.py
index 7f9ff30a..9d164746 100644
--- a/kfet/forms.py
+++ b/kfet/forms.py
@@ -7,7 +7,7 @@ from django.contrib.admin.widgets import FilteredSelectMultiple
 from django.forms import modelformset_factory
 from django.utils import timezone
 from kfet.models import (Account, Checkout, Article, OperationGroup, Operation,
-    CheckoutStatement, ArticleCategory, Settings)
+    CheckoutStatement, ArticleCategory, Settings, AccountNegative)
 from gestioncof.models import CofProfile
 
 # -----
@@ -104,6 +104,15 @@ class GroupForm(forms.ModelForm):
         model  = Group
         fields = ['name', 'permissions']
 
+class AccountNegativeForm(forms.ModelForm):
+    class Meta:
+        model  = AccountNegative
+        fields = ['authz_overdraft_amount', 'authz_overdraft_until',
+                  'balance_offset', 'comment']
+        widgets = {
+            'authz_overdraft_until': DateTimeWidget(),
+        }
+
 # -----
 # Checkout forms
 # -----
diff --git a/kfet/templates/kfet/account_update.html b/kfet/templates/kfet/account_update.html
index dedbcb24..0c63d6a3 100644
--- a/kfet/templates/kfet/account_update.html
+++ b/kfet/templates/kfet/account_update.html
@@ -1,4 +1,8 @@
- {% extends "kfet/base.html" %}
+{% extends "kfet/base.html" %}
+
+{% block extra_head %}
+{{ negative_form.media }}
+{% endblock %}
 
 {% block title %}
 {% if account.user == request.user %}
@@ -34,7 +38,16 @@
           {{ cof_form.as_p }}
           {{ account_form.as_p }}
           {{ group_form.as_p }}
-          {% if perms.kfet.is_team and not perms.kfet.change_account %}
+          {{ negative_form.non_field_errors }}
+          {% for field in negative_form %}
+            {{ field.errors }}
+            {{ field.label_tag }}
+            <div style="position:relative">{{ field }}</div>
+            {% if field.help_text %}
+              <p class="help">{{ field.help_text|safe }}</p>
+            {% endif %}
+          {% endfor %}
+          {% if perms.kfet.is_team %}
             <input type="password" name="KFETPASSWORD">
           {% endif %}
           <input type="submit" value="Mettre à jour">
@@ -44,4 +57,16 @@
   </div>
 </div>
 
+<script type="text/javascript">
+
+$(document).ready(function() {
+    $('#id_authz_overdraft_until').datetimepicker({
+        format: 'YYYY-MM-DD HH:mm',
+        stepping: 5,
+        locale: 'fr',
+    });
+});
+
+</script>
+
 {% endblock %}
diff --git a/kfet/views.py b/kfet/views.py
index ac8afcb8..87784e6c 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -230,11 +230,16 @@ def account_update(request, trigramme):
         group_form   = UserGroupForm(instance=account.user)
         account_form = AccountForm(instance=account)
         cof_form     = CofRestrictForm(instance=account.cofprofile)
+        if hasattr(account, 'negative'):
+            negative_form = AccountNegativeForm(instance=account.negative)
+        else:
+            negative_form = None
     else:
         user_form    = UserRestrictForm(instance=account.user)
         account_form = None
         cof_form     = None
         group_form   = None
+        negative_form = None
 
     if request.method == "POST":
         # Update attempt
@@ -246,6 +251,8 @@ def account_update(request, trigramme):
             cof_form     = CofRestrictForm(request.POST, instance=account.cofprofile)
             user_form    = UserRestrictTeamForm(request.POST, instance=account.user)
             group_form   = UserGroupForm(request.POST, instance=account.user)
+            if hasattr(account, 'negative'):
+                negative_form = AccountNegativeForm(request.POST, instance=account.negative)
 
             if (request.user.has_perm('kfet.change_account')
                     and account_form.is_valid() and cof_form.is_valid()
@@ -254,6 +261,7 @@ def account_update(request, trigramme):
                 # Fill data for Account.save()
                 put_cleaned_data_in_dict(data, user_form)
                 put_cleaned_data_in_dict(data, cof_form)
+                print(vars(account.negative))
 
                 # Updating
                 account_form.save(data = data)
@@ -262,6 +270,25 @@ def account_update(request, trigramme):
                 if (request.user.has_perm('kfet.manage_perms')
                         and group_form.is_valid()):
                     group_form.save()
+                print(vars(account.negative))
+
+                # Checking perm to manage negative
+                if hasattr(account, 'negative'):
+                    balance_offset_old = 0
+                    if account.negative.balance_offset:
+                        balance_offset_old = account.negative.balance_offset
+                if (hasattr(account, 'negative')
+                        and request.user.has_perm('kfet.change_accountnegative')
+                        and negative_form.is_valid()):
+                    balance_offset_new = negative_form.cleaned_data['balance_offset']
+                    if not balance_offset_new:
+                        balance_offset_new = 0
+                    balance_offset_diff = balance_offset_old - balance_offset_new
+                    Account.objects.filter(pk=account.pk).update(
+                        balance = F('balance') + balance_offset_diff)
+                    negative_form.save()
+                    if not balance_offset_new and Account.objects.get(pk=account.pk).balance >= 0:
+                        AccountNegative.objects.get(account=account).delete()
 
                 success = True
                 messages.success(request,
@@ -291,6 +318,7 @@ def account_update(request, trigramme):
         'cof_form'     : cof_form,
         'user_form'    : user_form,
         'group_form'   : group_form,
+        'negative_form': negative_form,
     })
 
 @permission_required('kfet.manage_perms')