diff --git a/erpnext/manufacturing/doctype/job_card/job_card.js b/erpnext/manufacturing/doctype/job_card/job_card.js
index cc8bdf04176..52423c600d9 100644
--- a/erpnext/manufacturing/doctype/job_card/job_card.js
+++ b/erpnext/manufacturing/doctype/job_card/job_card.js
@@ -296,7 +296,16 @@ frappe.ui.form.on("Job Card", {
 	prepare_timer_buttons: function (frm) {
 		frm.trigger("make_dashboard");
 
+		const transfer_pending =
+			!frm.doc.is_corrective_job_card &&
+			(frm.doc.items || []).length &&
+			flt(frm.doc.transferred_qty) < flt(frm.doc.for_quantity);
+
 		if (!frm.doc.started_time && !frm.doc.current_time) {
+			if (transfer_pending) {
+				return;
+			}
+
 			frm.add_custom_button(__("Start Job"), () => {
 				if ((frm.doc.employee && !frm.doc.employee.length) || !frm.doc.employee) {
 					frappe.prompt(
diff --git a/erpnext/manufacturing/doctype/job_card/job_card.py b/erpnext/manufacturing/doctype/job_card/job_card.py
index 9fddeda3e96..b1854088975 100644
--- a/erpnext/manufacturing/doctype/job_card/job_card.py
+++ b/erpnext/manufacturing/doctype/job_card/job_card.py
@@ -513,6 +513,8 @@ class JobCard(Document):
 			)
 
 	def add_time_log(self, args):
+		self.validate_transfer_qty()
+
 		last_row = []
 		employees = args.employees
 		if isinstance(employees, str):