diff --git a/erpnext/stock/report/delayed_order_report/test_delayed_order_report.py b/erpnext/stock/report/delayed_order_report/test_delayed_order_report.py
new file mode 100644
index 00000000000..2ae46e0241e
--- /dev/null
+++ b/erpnext/stock/report/delayed_order_report/test_delayed_order_report.py
@@ -0,0 +1,60 @@
+# Copyright (c) 2026, Frappe Technologies Pvt. Ltd. and Contributors
+# See license.txt
+
+import frappe
+
+from erpnext.selling.doctype.sales_order.mapper import make_delivery_note
+from erpnext.selling.doctype.sales_order.test_sales_order import make_sales_order
+from erpnext.stock.doctype.item.test_item import make_item
+from erpnext.stock.doctype.stock_entry.stock_entry_utils import make_stock_entry
+from erpnext.stock.report.delayed_order_report.delayed_order_report import execute
+from erpnext.tests.utils import ERPNextTestSuite
+
+
+class TestDelayedOrderReport(ERPNextTestSuite):
+	def run_report(self, **extra):
+		filters = frappe._dict(
+			{
+				"company": "_Test Company",
+				"from_date": "2026-06-01",
+				"to_date": "2026-06-30",
+				"based_on": "Delivery Note",
+			}
+		)
+		filters.update(extra)
+		return execute(filters)[1]
+
+	def test_late_order_shows_delay(self):
+		item_code = make_item(properties={"is_stock_item": 1, "is_sales_item": 1}).name
+
+		make_stock_entry(
+			item_code=item_code,
+			target="_Test Warehouse - _TC",
+			qty=10,
+			basic_rate=100,
+			posting_date="2026-06-01",
+		)
+
+		sales_order = make_sales_order(
+			item_code=item_code, qty=5, transaction_date="2026-06-01", do_not_submit=True
+		)
+		sales_order.delivery_date = "2026-06-05"
+		for item in sales_order.items:
+			item.delivery_date = "2026-06-05"
+		sales_order.submit()
+
+		delivery_note = make_delivery_note(sales_order.name)
+		delivery_note.set_posting_time = 1
+		delivery_note.posting_date = "2026-06-10"
+		delivery_note.insert()
+		delivery_note.submit()
+
+		data = self.run_report(sales_order=sales_order.name)
+
+		matching = [row for row in data if row.get("sales_order") == sales_order.name]
+		self.assertEqual(len(matching), 1)
+
+		row = matching[0]
+		self.assertEqual(frappe.utils.getdate(row.get("delivery_date")), frappe.utils.getdate("2026-06-05"))
+		self.assertEqual(frappe.utils.getdate(row.get("posting_date")), frappe.utils.getdate("2026-06-10"))
+		self.assertEqual(row.get("delayed_days"), 5)