diff --git a/__init__.py b/__init__.py
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0650744f6bc69b9f0b865e8c7174c813a5f5995e 100644
--- a/__init__.py
+++ b/__init__.py
@@ -0,0 +1 @@
+from . import models
diff --git a/__manifest__.py b/__manifest__.py
index 3f96eef83ab56ea54d01926f24940402200e8a4c..e77960a156597cb5927b4a726147f597f51ebcd4 100644
--- a/__manifest__.py
+++ b/__manifest__.py
@@ -7,6 +7,6 @@
     "license": "AGPL-3",
     "depends": ["crm"],
     "data": [
-        "security/crm_security.xml",
+        "views/crm_lead_views.xml",
     ],
 }
diff --git a/models/__init__.py b/models/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..e66f0d6cf4e5ece338dbf1bc73d90fba97a84417
--- /dev/null
+++ b/models/__init__.py
@@ -0,0 +1 @@
+from . import crm_lead
diff --git a/models/crm_lead.py b/models/crm_lead.py
new file mode 100644
index 0000000000000000000000000000000000000000..fdfd2d4f7137f77294481a73b225626ec02714fe
--- /dev/null
+++ b/models/crm_lead.py
@@ -0,0 +1,67 @@
+# Copyright 2024- Le Filament (https://le-filament.com)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html)
+
+from odoo import api, fields, models
+
+
+class Lead(models.Model):
+    _inherit = "crm.lead"
+    DEFAULT_EXPECTED_REVENUE_VAT = 0.2
+
+    # ------------------------------------------------------
+    # Fields declaration
+    # ------------------------------------------------------
+    expected_revenue = fields.Monetary("Revenu espéré HT")
+    expected_revenue_incl_tax = fields.Monetary(
+        "Revenu espéré TTC",
+        currency_field="company_currency",
+        compute="_compute_expected_revenue_incl_tax",
+        store=False,
+    )
+
+    # ------------------------------------------------------
+    # SQL Constraints
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Default methods
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Computed fields / Search Fields
+    # ------------------------------------------------------
+    @api.depends("expected_revenue")
+    def _compute_expected_revenue_incl_tax(self):
+        for lead in self:
+            lead.expected_revenue_incl_tax = (
+                (lead.expected_revenue * (1 + Lead.DEFAULT_EXPECTED_REVENUE_VAT))
+                if lead.expected_revenue
+                else 0
+            )
+
+    # ------------------------------------------------------
+    # Onchange / Constraints
+    # ------------------------------------------------------
+    @api.onchange("expected_revenue_incl_tax")
+    def _onchange_expected_revenue_incl_tax(self):
+        for lead in self:
+            lead.expected_revenue = (
+                (
+                    lead.expected_revenue_incl_tax
+                    / (1 + Lead.DEFAULT_EXPECTED_REVENUE_VAT)
+                )
+                if lead.expected_revenue_incl_tax
+                else 0
+            )
+
+    # ------------------------------------------------------
+    # CRUD methods (ORM overrides)
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Actions
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Business methods
+    # ------------------------------------------------------
diff --git a/security/crm_security.xml b/security/crm_security.xml
deleted file mode 100644
index 80197643f3588e37493a426a7f81a68aada27a05..0000000000000000000000000000000000000000
--- a/security/crm_security.xml
+++ /dev/null
@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<odoo>
-    <!-- Add CRM group category -->
-     <record model="ir.module.category" id="3a_crm_module_category">
-        <field name="name">CRM</field>
-        <field name="parent_id" ref="base.module_category_sales" />
-    </record>
-
-    <!-- Add CRM groups -->
-    <record id="group_3a_crm_user" model="res.groups">
-        <field name="name">CRM : Mes opportunités seulement</field>
-        <field name="category_id" ref="3a_crm_module_category" />
-        <field name="implied_ids" eval="[(4, ref('base.group_user'))]" />
-    </record>
-    <record id="group_3a_crm_admin" model="res.groups">
-        <field name="name">CRM : Toutes les opportunités</field>
-        <field name="category_id" ref="3a_crm_module_category" />
-        <field name="implied_ids" eval="[(6, 0, [ref('group_3a_crm_user')])]" />
-    </record>
-
-    <!-- Update crm rules -->
-    <record id="crm.crm_rule_personal_lead" model="ir.rule">
-        <field name="groups" eval="[(6, 0, [ref('group_3a_crm_user')])]" />
-    </record>
-
-    <record id="crm.crm_rule_all_lead" model="ir.rule">
-        <field name="groups" eval="[(6, 0, [ref('group_3a_crm_admin')])]" />
-    </record>
-</odoo>
diff --git a/views/crm_lead_views.xml b/views/crm_lead_views.xml
new file mode 100644
index 0000000000000000000000000000000000000000..78c1fac79ea784f3629eab7cc560839083642575
--- /dev/null
+++ b/views/crm_lead_views.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!-- Copyright 2024- Le Filament (https://le-filament.com)
+     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->
+<odoo>
+     <record id="crm_lead_view_form" model="ir.ui.view">
+          <field name="name">crm.3a.lead.form</field>
+          <field name="model">crm.lead</field>
+          <field name="inherit_id" ref="crm.crm_lead_view_form" />
+          <field name="arch" type="xml">
+               <xpath expr="//h2[1]" position="after">
+                    <h2 class="d-flex gap-2 g-0 align-items-end pb-3">
+                         <div attrs="{'invisible': [('type', '=', 'lead')]}">
+                              <label
+                            for="expected_revenue_incl_tax"
+                            class="oe_edit_only pb-1"
+                        />
+                              <div class="d-flex align-items-end">
+                                   <field
+                                name="expected_revenue_incl_tax"
+                                class="oe_inline o_input_13ch"
+                                widget='monetary'
+                                options="{'currency_field': 'company_currency'}"
+                                readonly="0"
+                            />
+                              </div>
+                         </div>
+                    </h2>
+               </xpath>
+          </field>
+     </record>
+</odoo>