diff --git a/verdigado_attendance/__init__.py b/verdigado_attendance/__init__.py
index 0650744..aee8895 100644
--- a/verdigado_attendance/__init__.py
+++ b/verdigado_attendance/__init__.py
@@ -1 +1,2 @@
 from . import models
+from . import wizards
diff --git a/verdigado_attendance/__manifest__.py b/verdigado_attendance/__manifest__.py
index 16ad199..44b0f9b 100644
--- a/verdigado_attendance/__manifest__.py
+++ b/verdigado_attendance/__manifest__.py
@@ -47,6 +47,7 @@
         "views/hr_menu_human_resources_configuration.xml",
         "views/menu.xml",
         "views/res_config_settings.xml",
+        "wizards/verdigado_holidays_wizard.xml",
     ],
     "demo": [
         "demo/res_users.xml",
diff --git a/verdigado_attendance/security/ir.model.access.csv b/verdigado_attendance/security/ir.model.access.csv
index b395026..1e862ec 100644
--- a/verdigado_attendance/security/ir.model.access.csv
+++ b/verdigado_attendance/security/ir.model.access.csv
@@ -3,4 +3,5 @@ access_hr_attendance_report_verdigado,hr.attendance.report.verdigado,hr_attendan
 access_hr_attendance_user_verdigado,hr.attendance.user.verdigado,hr_attendance.model_hr_attendance,hr_attendance.group_hr_attendance,1,1,1,1
 access_resource_calendar_officer_verdigado,resource.calendar.system,resource.model_resource_calendar,hr.group_hr_manager,1,1,1,1
 access_resource_calendar_attendance_officer_verdigado,resource.calendar.attendance.system,resource.model_resource_calendar_attendance,hr.group_hr_manager,1,1,1,1
+access_verdigado_holidays_wizard,access_verdigado_holidays_wizard,verdigado_attendance.model_verdigado_holidays_wizard,hr.group_hr_manager,1,1,1,1
 hr_attendance_break.access_hr_attendance_break,access_hr_attendance_break,model_hr_attendance_break,base.group_user,1,1,1,1
diff --git a/verdigado_attendance/tests/__init__.py b/verdigado_attendance/tests/__init__.py
index dbf018d..4aa5637 100644
--- a/verdigado_attendance/tests/__init__.py
+++ b/verdigado_attendance/tests/__init__.py
@@ -3,6 +3,7 @@
 
 from . import hr_case
 from . import test_holidays
+from . import test_holiday_wizard
 from . import test_hr_access
 from . import test_overtime_calculation
 from . import test_misc
diff --git a/verdigado_attendance/tests/test_holiday_wizard.py b/verdigado_attendance/tests/test_holiday_wizard.py
new file mode 100644
index 0000000..3078263
--- /dev/null
+++ b/verdigado_attendance/tests/test_holiday_wizard.py
@@ -0,0 +1,206 @@
+# Copyright 2023 Hunki Enterprises BV
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+
+from dateutil.relativedelta import relativedelta
+
+from odoo import fields
+from odoo.tests.common import TransactionCase
+
+
+class TestHolidayWizard(TransactionCase):
+    def setUp(self):
+        super().setUp()
+        self.employee = self.env.ref("hr.employee_qdp")
+        self.leave_type = self.env.ref("hr_holidays.holiday_status_cl")
+
+    def _test_holidays_wizard(self):
+        wizard = (
+            self.env["verdigado.holidays.wizard"]
+            .with_context(
+                active_model="hr.employee",
+                active_ids=self.employee.ids,
+                active_id=self.employee.id,
+            )
+            .create({})
+        )
+        action = wizard.button_assign_vacation()
+        return self.env[action["res_model"]].search(action["domain"])
+
+    def test_no_validation(self):
+        """Test that the holidays wizard creates allocations with slightly changed defaults"""
+        self.leave_type.allocation_validation_type = "no"
+        self.employee.calendar_ids.unlink()
+        allocation = self._test_holidays_wizard()
+        self.assertFalse(allocation)
+
+    def test_25h_week(self):
+        """Test an employee with a 2 day week"""
+        calendar_25h = self.env["resource.calendar"].create(
+            {
+                "name": "25h week",
+                "attendance_ids": [
+                    (
+                        0,
+                        0,
+                        {
+                            "name": "Monday",
+                            "dayofweek": "0",
+                            "hour_from": 8,
+                            "hour_to": 16,
+                        },
+                    ),
+                    (
+                        0,
+                        0,
+                        {
+                            "name": "Tuesday",
+                            "dayofweek": "1",
+                            "hour_from": 8,
+                            "hour_to": 16,
+                        },
+                    ),
+                    (
+                        0,
+                        0,
+                        {
+                            "name": "Wednesday",
+                            "dayofweek": "2",
+                            "hour_from": 8,
+                            "hour_to": 17,
+                        },
+                    ),
+                ],
+            }
+        )
+        self.employee.write(
+            {
+                "calendar_ids": [
+                    (6, 0, []),
+                    (
+                        0,
+                        0,
+                        {
+                            "date_start": fields.Date.today()
+                            + relativedelta(month=1, day=1, years=1),
+                            "date_end": fields.Date.today()
+                            + relativedelta(month=6, day=30, years=1),
+                            "calendar_id": calendar_25h.id,
+                        },
+                    ),
+                ],
+            }
+        )
+        allocation = self._test_holidays_wizard()
+        self.assertEqual(allocation.employee_id, self.employee)
+        self.assertEqual(allocation.number_of_days, 9)
+
+    def test_multi_calendar_2_times5days(self):
+        """Two times 5d week"""
+        self.employee.write(
+            {
+                "calendar_ids": [
+                    (6, 0, []),
+                    (
+                        0,
+                        0,
+                        {
+                            "date_start": fields.Date.today()
+                            + relativedelta(month=1, day=1, years=1),
+                            "date_end": fields.Date.today()
+                            + relativedelta(month=6, day=30, years=1),
+                            "calendar_id": self.env.ref(
+                                "resource.resource_calendar_std"
+                            ).id,
+                        },
+                    ),
+                    (
+                        0,
+                        0,
+                        {
+                            "date_start": fields.Date.today()
+                            + relativedelta(month=7, day=1, years=1),
+                            "date_end": fields.Date.today()
+                            + relativedelta(month=12, day=31, years=1),
+                            "calendar_id": self.env.ref(
+                                "resource.resource_calendar_std"
+                            ).id,
+                        },
+                    ),
+                ],
+            }
+        )
+        allocation = self._test_holidays_wizard()
+        self.assertEqual(allocation.number_of_days, 30)
+
+    def test_multi_calendar_short_4day_long_5day(self):
+        """4d week in jan/feb, 5d rest"""
+        four_day_week = self.env.ref("resource.resource_calendar_std_38h")
+        four_day_week.attendance_ids.filtered(lambda x: x.dayofweek == "4").unlink()
+        self.employee.write(
+            {
+                "calendar_ids": [
+                    (6, 0, []),
+                    (
+                        0,
+                        0,
+                        {
+                            "date_start": fields.Date.today()
+                            + relativedelta(month=1, day=1, years=1),
+                            "date_end": fields.Date.today()
+                            + relativedelta(month=2, day=28, years=1),
+                            "calendar_id": four_day_week.id,
+                        },
+                    ),
+                    (
+                        0,
+                        0,
+                        {
+                            "date_start": fields.Date.today()
+                            + relativedelta(month=3, day=1, years=1),
+                            "calendar_id": self.env.ref(
+                                "resource.resource_calendar_std"
+                            ).id,
+                        },
+                    ),
+                ],
+            }
+        )
+        allocation = self._test_holidays_wizard()
+        self.assertEqual(allocation.number_of_days, 29)
+
+    def test_multi_calendar_short_4day_long_5day_no_month_boundary(self):
+        """4d week in jan/feb, 5d rest without ending at a month end"""
+        four_day_week = self.env.ref("resource.resource_calendar_std_38h")
+        four_day_week.attendance_ids.filtered(lambda x: x.dayofweek == "4").unlink()
+        self.employee.write(
+            {
+                "calendar_ids": [
+                    (6, 0, []),
+                    (
+                        0,
+                        0,
+                        {
+                            "date_start": fields.Date.today()
+                            + relativedelta(month=1, day=1, years=1),
+                            "date_end": fields.Date.today()
+                            + relativedelta(month=2, day=15, years=1),
+                            "calendar_id": four_day_week.id,
+                        },
+                    ),
+                    (
+                        0,
+                        0,
+                        {
+                            "date_start": fields.Date.today()
+                            + relativedelta(month=2, day=16, years=1),
+                            "calendar_id": self.env.ref(
+                                "resource.resource_calendar_std"
+                            ).id,
+                        },
+                    ),
+                ],
+            }
+        )
+        allocation = self._test_holidays_wizard()
+        self.assertEqual(allocation.number_of_days, 29)
diff --git a/verdigado_attendance/wizards/__init__.py b/verdigado_attendance/wizards/__init__.py
new file mode 100644
index 0000000..0747d40
--- /dev/null
+++ b/verdigado_attendance/wizards/__init__.py
@@ -0,0 +1,2 @@
+# License AGPL-3 - See http://www.gnu.org/licenses/agpl-3.0.html
+from . import verdigado_holidays_wizard
diff --git a/verdigado_attendance/wizards/verdigado_holidays_wizard.py b/verdigado_attendance/wizards/verdigado_holidays_wizard.py
new file mode 100644
index 0000000..0e1fc56
--- /dev/null
+++ b/verdigado_attendance/wizards/verdigado_holidays_wizard.py
@@ -0,0 +1,120 @@
+# License AGPL-3 - See http://www.gnu.org/licenses/agpl-3.0.html
+
+import math
+from datetime import date
+
+from dateutil.relativedelta import relativedelta
+
+from odoo import _, fields, models
+
+
+class VerdigadoHolidaysWizard(models.TransientModel):
+    _name = "verdigado.holidays.wizard"
+    _description = "Create holidays allocations"
+
+    full_vacation = fields.Float(
+        default=30,
+        string="Vacation days (100%)",
+        required=True,
+        help="Vacation of a FTE in days",
+    )
+    year = fields.Selection(
+        lambda self: [
+            (year, year)
+            for year in range(fields.Date.today().year, fields.Date.today().year + 3)
+        ],
+        default=lambda self: fields.Date.today().year + 1,
+        required=True,
+    )
+    date_start = fields.Date(
+        required=True,
+        string="Validity start",
+        default=lambda self: fields.Date.today()
+        + relativedelta(month=1, day=1, years=1),
+    )
+    date_end = fields.Date(
+        string="Validity end",
+        default=lambda self: fields.Date.today()
+        + relativedelta(month=1, day=1, years=1),
+    )
+    leave_type_id = fields.Many2one(
+        "hr.leave.type",
+        required=True,
+        default=lambda self: self.env.ref("hr_holidays.holiday_status_cl", False),
+    )
+    employee_ids = fields.Many2many("hr.employee", string="Employees")
+
+    def button_assign_vacation(self):
+        interval_start = date(int(self.year), 1, 1)
+        interval_end = interval_start.replace(month=12, day=31)
+        days = (interval_end - interval_start).days
+        allocations = self.env["hr.leave.allocation"].browse([])
+        for employee in self.employee_ids or self.env["hr.employee"].browse(
+            self.env.context.get("active_ids", [])
+        ):
+            percentage = 0.0
+            for calendar in employee.calendar_ids:
+                if (
+                    calendar.date_start
+                    and calendar.date_start >= interval_end
+                    or calendar.date_end
+                    and calendar.date_end <= interval_start
+                ):
+                    continue
+                week_days = len(
+                    set(calendar.calendar_id.mapped("attendance_ids.dayofweek"))
+                )
+                # use month precision if calendar starts and ends on a month boundary
+                # use day precision otherwise
+                if (
+                    max(calendar.date_start or interval_start, interval_start).day == 1
+                    and (
+                        min(calendar.date_end or interval_end, interval_end)
+                        + relativedelta(days=1)
+                    ).month
+                    != min(calendar.date_end or interval_end, interval_end).month
+                ):
+                    interval_percentage = round(
+                        float(
+                            min(calendar.date_end or interval_end, interval_end).month
+                            - max(
+                                calendar.date_start or interval_start, interval_start
+                            ).month
+                            + 1
+                        )
+                        / (interval_end.month - interval_start.month + 1),
+                        2,
+                    )
+                else:
+                    interval_percentage = round(
+                        (
+                            min(calendar.date_end or interval_end, interval_end)
+                            - max(calendar.date_start or interval_start, interval_start)
+                        ).days
+                        / days,
+                        2,
+                    )
+                percentage += interval_percentage * round(float(week_days) / 5, 2)
+
+            if percentage:
+                allocations += self.env["hr.leave.allocation"].create(
+                    {
+                        "name": str(self.date_start.year),
+                        "employee_id": employee.id,
+                        "holiday_status_id": self.leave_type_id.id,
+                        "date_from": self.date_start,
+                        "date_to": self.date_end,
+                        "number_of_days": math.ceil(percentage * self.full_vacation),
+                    }
+                )
+        allocations.filtered(lambda x: x.state == "draft").action_confirm()
+        allocations.filtered(
+            lambda x: x.state in ("confirm", "validate1")
+        ).action_validate()
+        return {
+            "type": "ir.actions.act_window",
+            "res_model": "hr.leave.allocation",
+            "views": [(False, "list"), (False, "form")],
+            "domain": [("id", "in", allocations.ids)],
+            "name": _("Created allocations"),
+        }
diff --git a/verdigado_attendance/wizards/verdigado_holidays_wizard.xml b/verdigado_attendance/wizards/verdigado_holidays_wizard.xml
new file mode 100644
index 0000000..93d2cfd
--- /dev/null
+++ b/verdigado_attendance/wizards/verdigado_holidays_wizard.xml
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<odoo>
+    <record id="verdigado_holiday_wizard_form" model="ir.ui.view">
+        <field name="model">verdigado.holidays.wizard</field>
+        <field name="arch" type="xml">
+            <form>
+                <div>
+                    This wizard creates allocations proportional to a FTE with following
+                    values
+                </div>
+                <group>
+                    <field name="full_vacation" />
+                    <field name="year" />
+                    <field name="date_start" />
+                    <field name="date_end" />
+                    <field name="leave_type_id" />
+                    <field
+                        name="employee_ids"
+                        widget="many2many_tags"
+                        invisible="context.get('active_model') == 'hr.employee'"
+                        required="context.get('active_model') != 'hr.employee'"
+                    />
+                </group>
+                <footer>
+                    <button
+                        string="Create allocations"
+                        name="button_assign_vacation"
+                        type="object"
+                        class="btn-primary"
+                    />
+                    <button string="Discard" special="cancel" />
+                </footer>
+            </form>
+        </field>
+    </record>
+
+    <record id="action_verdigado_holiday_wizard" model="ir.actions.act_window">
+        <field name="name">Allocate vacation</field>
+        <field name="res_model">verdigado.holidays.wizard</field>
+        <field name="view_mode">form</field>
+        <field name="target">new</field>
+        <field name="binding_model_id" ref="hr.model_hr_employee" />
+    </record>
+
+    <menuitem
+        id="menu_verdigado_holiday_wizard"
+        parent="hr_holidays.menu_hr_holidays_approvals"
+        action="action_verdigado_holiday_wizard"
+    />
+</odoo>