diff --git a/kfet/migrations/0012_settings.py b/kfet/migrations/0012_settings.py
new file mode 100644
index 00000000..8f0f6247
--- /dev/null
+++ b/kfet/migrations/0012_settings.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('kfet', '0011_auto_20160807_1720'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Settings',
+            fields=[
+                ('id', models.AutoField(serialize=False, auto_created=True, primary_key=True, verbose_name='ID')),
+                ('name', models.CharField(max_length=45)),
+                ('value_decimal', models.DecimalField(null=True, max_digits=6, decimal_places=2, blank=True, default=None)),
+            ],
+        ),
+    ]
diff --git a/kfet/models.py b/kfet/models.py
index d74eeb7b..57a85320 100644
--- a/kfet/models.py
+++ b/kfet/models.py
@@ -410,13 +410,29 @@ class Operation(models.Model):
         max_digits = 6, decimal_places = 2,
         default = 0)
 
-    def save(self, *args, **kwargs):
-        #self.full_clean()
-        return super(Operation, self).save(*args, **kwargs)
-
 class GlobalPermissions(models.Model):
     class Meta:
         managed = False
         permissions = (
             ('is_team', 'Is part of the team'),
         )
+
+class Settings(models.Model):
+    name = models.CharField(max_length = 45)
+    value_decimal = models.DecimalField(
+        max_digits = 6, decimal_places = 2,
+        blank = True, null = True, default = None)
+
+    @staticmethod
+    def setting_inst(name):
+        return Settings.objects.get(name=name)
+
+    @staticmethod
+    def SUBVENTION_COF():
+        try:
+            return Settings.setting_inst("SUBVENTION_COF").value_decimal
+        except Settings.DoesNotExist:
+            return 0
+
+    class SettingsError(Exception):
+        pass
diff --git a/kfet/views.py b/kfet/views.py
index 7c801b9b..c8ca4836 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -10,7 +10,7 @@ from django.contrib.auth.models import User
 from django.http import HttpResponse, JsonResponse, Http404
 from django.forms import modelformset_factory
 from gestioncof.models import CofProfile, Clipper
-from kfet.models import Account, Checkout, Article
+from kfet.models import Account, Checkout, Article, Settings
 from kfet.forms import *
 from collections import defaultdict
 
@@ -406,11 +406,17 @@ def kpsul_perform_operations(request):
     operationgroup = operationgroup_form.save(commit = False)
     operations     = operation_formset.save(commit = False)
 
+    # Retrieving COF grant
+    cof_grant = Settings.SUBVENTION_COF()
+    cof_grant_divisor = 1 + cof_grant / 100
+
     # Calculating amount of each PURCHASE operations
     # and total amount for operation group
     for operation in operations:
         if operation.type == Operation.PURCHASE:
             operation.amount = - operation.article.price * operation.article_nb
+            if operationgroup.on_acc.is_cof:
+                operation.amount = operation.amount / cof_grant_divisor
         operationgroup.amount += operation.amount
 
     # Filling cof status for statistics