diff --git a/addons/at_accounting/models/mail_activity_type.py b/addons/at_accounting/models/mail_activity_type.py
new file mode 100644
index 0000000..8022b5e
--- /dev/null
+++ b/addons/at_accounting/models/mail_activity_type.py
@@ -0,0 +1,10 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import fields, models
+
+
+class AccountTaxReportActivityType(models.Model):
+    _inherit = "mail.activity.type"
+
+    category = fields.Selection(selection_add=[('tax_report', 'Tax report')])