diff --git a/l10n_th_account_tax/models/account_withholding_move.py b/l10n_th_account_tax/models/account_withholding_move.py
index 981d93367..f3153a1e3 100644
--- a/l10n_th_account_tax/models/account_withholding_move.py
+++ b/l10n_th_account_tax/models/account_withholding_move.py
@@ -65,6 +65,10 @@ class AccountWithholdingMove(models.Model):
         WHT_CERT_INCOME_TYPE,
         string="Type of Income",
     )
+    wht_cert_income_desc = fields.Char(
+        string="Income Description",
+        size=500,
+    )
     currency_id = fields.Many2one(
         comodel_name="res.currency",
         default=lambda self: self.env.user.company_id.currency_id,
@@ -82,3 +86,11 @@ def _compute_move_data(self):
             rec.date = rec.move_id and rec.move_id.date or False
             rec.calendar_year = rec.date and rec.date.strftime("%Y")
             rec.payment_id = rec.move_id.payment_id
+    
+    @api.onchange("wht_cert_income_type")
+    def _onchange_wht_cert_income_type(self):
+        if self.wht_cert_income_type:
+            select_dict = dict(WHT_CERT_INCOME_TYPE)
+            self.wht_cert_income_desc = select_dict[self.wht_cert_income_type]
+        else:
+            self.wht_cert_income_desc = False
diff --git a/l10n_th_account_tax/views/account_move_view.xml b/l10n_th_account_tax/views/account_move_view.xml
index 726553169..5e7a1d4eb 100644
--- a/l10n_th_account_tax/views/account_move_view.xml
+++ b/l10n_th_account_tax/views/account_move_view.xml
@@ -157,6 +157,7 @@
                             <field name="calendar_year" invisible="1" />
                             <field name="partner_id" readonly="1" />
                             <field name="wht_cert_income_type" />
+                            <field name="wht_cert_income_desc" optional="show" />
                             <field name="amount_income" />
                             <field name="amount_wht" />
                             <field name="is_pit" />
diff --git a/l10n_th_account_tax/views/account_payment_view.xml b/l10n_th_account_tax/views/account_payment_view.xml
index 75c2767e8..481557826 100644
--- a/l10n_th_account_tax/views/account_payment_view.xml
+++ b/l10n_th_account_tax/views/account_payment_view.xml
@@ -146,6 +146,7 @@
                             <field name="calendar_year" invisible="1" />
                             <field name="partner_id" readonly="1" />
                             <field name="wht_cert_income_type" />
+                            <field name="wht_cert_income_desc" optional="show" />
                             <field name="amount_income" />
                             <field name="amount_wht" />
                             <field name="is_pit" />
diff --git a/l10n_th_account_tax/views/account_withholding_move.xml b/l10n_th_account_tax/views/account_withholding_move.xml
index 0b89fe6ca..02f2255e3 100644
--- a/l10n_th_account_tax/views/account_withholding_move.xml
+++ b/l10n_th_account_tax/views/account_withholding_move.xml
@@ -10,6 +10,7 @@
                 <field name="date" optional="show" />
                 <field name="calendar_year" optional="show" />
                 <field name="wht_cert_income_type" />
+                <field name="wht_cert_income_desc" optional="show" />
                 <field name="amount_income" sum="Total Income" />
                 <field name="amount_wht" sum="Total Amount Withholding Tax" />
                 <field name="cancelled" optional="show" />
diff --git a/l10n_th_account_tax/views/withholding_tax_cert.xml b/l10n_th_account_tax/views/withholding_tax_cert.xml
index 22af42424..17c905e38 100644
--- a/l10n_th_account_tax/views/withholding_tax_cert.xml
+++ b/l10n_th_account_tax/views/withholding_tax_cert.xml
@@ -63,7 +63,7 @@
                         <tree editable="bottom">
                             <field name="company_id" invisible="1" />
                             <field name="wht_cert_income_type" />
-                            <field name="wht_cert_income_desc" />
+                            <field name="wht_cert_income_desc" optional="show" />
                             <field name="amount" sum="Total Tax" />
                             <field name="wht_tax_id" optional="hide" />
                             <field name="wht_percent" required="1" />