diff --git a/cotisations/forms.py b/cotisations/forms.py
index b59eb6c3..5659d495 100644
--- a/cotisations/forms.py
+++ b/cotisations/forms.py
@@ -91,8 +91,7 @@ class CreditSoldeForm(NewFactureForm):
         super(CreditSoldeForm, self).__init__(*args, **kwargs)
         # TODO : change solde to balance
         self.fields['paiement'].queryset = Paiement.objects.exclude(
-            moyen='solde'
-        ).exclude(moyen='Solde')
+            is_balance=True)
 
     montant = forms.DecimalField(max_digits=5, decimal_places=2, required=True)
 
diff --git a/cotisations/migrations/0038_paiement_is_balance.py b/cotisations/migrations/0038_paiement_is_balance.py
new file mode 100644
index 00000000..bea02a17
--- /dev/null
+++ b/cotisations/migrations/0038_paiement_is_balance.py
@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2018-07-04 16:30
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+def update_balance(apps, _):
+    Payment = apps.get_model('cotisations', 'Paiement')
+    try:
+        balance = Payment.objects.get(moyen="solde")
+        balance.is_balance = True
+        balance.save()
+    except Payment.DoesNotExist:
+        pass
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cotisations', '0037_auto_20180703_1202'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='paiement',
+            name='is_balance',
+            field=models.BooleanField(default=False, editable=False, help_text='There should be only one balance payment method.', verbose_name='Is user balance'),
+        ),
+        migrations.RunPython(update_balance)
+    ]
diff --git a/cotisations/migrations/0039_auto_20180704_1147.py b/cotisations/migrations/0039_auto_20180704_1147.py
new file mode 100644
index 00000000..3f982430
--- /dev/null
+++ b/cotisations/migrations/0039_auto_20180704_1147.py
@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2018-07-04 16:47
+from __future__ import unicode_literals
+
+import cotisations.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cotisations', '0038_paiement_is_balance'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='paiement',
+            name='is_balance',
+            field=models.BooleanField(default=False, editable=False, help_text='There should be only one balance payment method.', validators=[cotisations.models.check_no_balance], verbose_name='Is user balance'),
+        ),
+    ]
diff --git a/cotisations/models.py b/cotisations/models.py
index 58e0f2d3..d6280045 100644
--- a/cotisations/models.py
+++ b/cotisations/models.py
@@ -594,6 +594,17 @@ class Banque(RevMixin, AclMixin, models.Model):
         return self.name
 
 
+def check_no_balance():
+    """This functions checks that no Paiement with is_balance=True exists
+
+    :raises ValidationError: if such a Paiement exists.
+    """
+    p = Paiement.objects.filter(is_balance=True)
+    if len(p)>0:
+        raise ValidationError(
+            _("There are already payment method(s) for user balance")
+        )
+
 # TODO : change Paiement to Payment
 class Paiement(RevMixin, AclMixin, models.Model):
     """
@@ -624,6 +635,13 @@ class Paiement(RevMixin, AclMixin, models.Model):
         default=False,
         verbose_name=_l("Is available for every user")
     )
+    is_balance = models.BooleanField(
+        default=False,
+        editable=False,
+        verbose_name=_l("Is user balance"),
+        help_text=_l("There should be only one balance payment method."),
+        validators=[check_no_balance]
+    )
 
     class Meta:
         permissions = (
diff --git a/cotisations/payment_methods/balance/models.py b/cotisations/payment_methods/balance/models.py
index 957244d7..ae4d2f0b 100644
--- a/cotisations/payment_methods/balance/models.py
+++ b/cotisations/payment_methods/balance/models.py
@@ -55,3 +55,14 @@ class BalancePayment(PaymentMethodMixin, models.Model):
             request,
             use_payment_method=False
         )
+
+    def valid_form(self, form):
+        p = Paiement.objects.filter(is_balance=True)
+        if len(p) > 0:
+            form.add_error(
+                'payment_method',
+                _("There is already a payment type for user balance")
+            )
+
+    def alter_payment(self, payment):
+        self.payment.is_balance = True
diff --git a/cotisations/payment_methods/forms.py b/cotisations/payment_methods/forms.py
index 37653c3a..2b712439 100644
--- a/cotisations/payment_methods/forms.py
+++ b/cotisations/payment_methods/forms.py
@@ -51,16 +51,27 @@ class PaymentMethodForm(forms.Form):
         else:
             self.fields = {}
 
-    def save(self, *args, payment=None, **kwargs):
-        commit = kwargs.pop('commit', True)
+    def clean(self):
+        super(PaymentMethodForm, self).clean()
         choice = self.cleaned_data['payment_method']
         if choice=='':
             return
         choice = int(choice)
         model = PAYMENT_METHODS[choice].PaymentMethod
         form = forms.modelform_factory(model, fields='__all__')(self.data, prefix=self.prefix)
-        payment_method = form.save(commit=False)
-        payment_method.payment = payment
+        self.payment_method = form.save(commit=False)
+        if hasattr(self.payment_method, 'valid_form'):
+            self.payment_method.valid_form(self)
+        return self.cleaned_data
+
+
+
+    def save(self, payment, *args, **kwargs):
+        commit = kwargs.pop('commit', True)
+        self.payment_method.payment = payment
+        if hasattr(self.payment_method, 'alter_payment'):
+            self.payment_method.alter_payment(payment)
         if commit:
-            payment_method.save()
-        return payment_method
+            payment.save()
+            self.payment_method.save()
+        return self.payment_method
diff --git a/cotisations/templates/cotisations/facture.html b/cotisations/templates/cotisations/facture.html
index 03a4225b..081f3f51 100644
--- a/cotisations/templates/cotisations/facture.html
+++ b/cotisations/templates/cotisations/facture.html
@@ -31,6 +31,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 {% block content %}
 {% bootstrap_form_errors factureform %}
+{% if payment_method %}
+{% bootstrap_form_errors payment_method %}
+{% endif %}
 {% if title %}
 <h3>{{title}}</h3>
 {% endif %}
diff --git a/cotisations/views.py b/cotisations/views.py
index bb391d13..80f89ea1 100644
--- a/cotisations/views.py
+++ b/cotisations/views.py
@@ -409,7 +409,7 @@ def add_paiement(request):
     )
     if payment.is_valid() and payment_method.is_valid():
         payment = payment.save()
-        payment_method.save(payment=payment)
+        payment_method.save(payment)
         messages.success(
             request,
             _("The payment method has been successfully created.")
@@ -688,7 +688,7 @@ def new_facture_solde(request, userid):
     """
     user = request.user
     invoice = Facture(user=user)
-    payment, _created = Paiement.objects.get_or_create(moyen='Solde')
+    payment, _created = Paiement.objects.get_or_create(is_balance=True)
     invoice.paiement = payment
     # The template needs the list of articles (for the JS part)
     article_list = Article.objects.filter(
diff --git a/preferences/models.py b/preferences/models.py
index eeae30f9..4a22edbe 100644
--- a/preferences/models.py
+++ b/preferences/models.py
@@ -118,10 +118,7 @@ class OptionalUser(AclMixin, PreferencesModel):
     def clean(self):
         """Creation du mode de paiement par solde"""
         if self.user_solde:
-            p = cotisations.models.Paiement.objects.filter(moyen="Solde")
-            if not len(p):
-                c = cotisations.models.Paiement(moyen="Solde")
-                c.save()
+            cotisations.models.Paiement.objects.get_or_create(is_balance=True)
 
 
 @receiver(post_save, sender=OptionalUser)
diff --git a/users/models.py b/users/models.py
index 50f7c51f..cb26ace7 100644
--- a/users/models.py
+++ b/users/models.py
@@ -428,7 +428,7 @@ class User(RevMixin, FieldPermissionModelMixin, AbstractBaseUser,
     def solde(self):
         """ Renvoie le solde d'un user.
         Somme les crédits de solde et retire les débit payés par solde"""
-        solde_objects = Paiement.objects.filter(moyen='solde')
+        solde_objects = Paiement.objects.filter(is_balance=True)
         somme_debit = Vente.objects.filter(
             facture__in=Facture.objects.filter(
                 user=self,