diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index b344731561f..86081a1b3a4 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -502,8 +502,11 @@ class AccountMove(models.Model):
         default=False,
         copy=False,
         tracking=True,
-        help="It indicates that the invoice/payment has been sent.",
+        store=True,
+        compute="_compute_is_move_sent",
+        help="It indicates that the invoice/payment has been sent or the PDF has been generated.",
     )
+
     invoice_user_id = fields.Many2one(
         string='Salesperson',
         comodel_name='res.users',
@@ -610,6 +613,11 @@ class AccountMove(models.Model):
     # COMPUTE METHODS
     # -------------------------------------------------------------------------
 
+    @api.depends('invoice_pdf_report_id')
+    def _compute_is_move_sent(self):
+        for move in self:
+            move.is_move_sent = bool(move.invoice_pdf_report_id)
+
     def _compute_payment_reference(self):
         for move in self.filtered(lambda m: (
             m.state == 'posted'
diff --git a/addons/account/wizard/account_move_send.py b/addons/account/wizard/account_move_send.py
index 9062510d248..dbd47aaef6a 100644
--- a/addons/account/wizard/account_move_send.py
+++ b/addons/account/wizard/account_move_send.py
@@ -343,7 +343,6 @@ class AccountMoveSend(models.Model):
                     'reply_to_force_new': False,
                 },
             )
-        move.is_move_sent = True
 
     def _send_mails(self, moves):
         subtype = self.env.ref('mail.mt_comment')
@@ -393,6 +392,7 @@ class AccountMoveSend(models.Model):
         # note: Binary is used for security reason
         self.env['ir.attachment'].create(prepared_data['pdf_attachment_values'])
         invoice.invalidate_model(fnames=['invoice_pdf_report_id', 'invoice_pdf_report_file'])
+        self.env.add_to_compute(invoice._fields['is_move_sent'], invoice)
 
     def _postprocess_document(self, invoice, prepared_data):
         """ Postprocess prepared_data before it gets linked to the record
diff --git a/addons/snailmail_account/wizard/account_move_send.py b/addons/snailmail_account/wizard/account_move_send.py
index 5e166f92102..0b78ff7afb6 100644
--- a/addons/snailmail_account/wizard/account_move_send.py
+++ b/addons/snailmail_account/wizard/account_move_send.py
@@ -68,6 +68,4 @@ class AccountMoveSend(models.Model):
                 ])\
                 ._snailmail_print(immediate=False)
 
-            moves.is_move_sent = True
-
         return moves