diff --git a/src/app/(protected)/workorders/_components/list/table/cells/status-cell.tsx b/src/app/(protected)/workorders/_components/list/table/cells/status-cell.tsx
index d2e4c78a..c5857f1e 100644
--- a/src/app/(protected)/workorders/_components/list/table/cells/status-cell.tsx
+++ b/src/app/(protected)/workorders/_components/list/table/cells/status-cell.tsx
@@ -49,7 +49,7 @@ export function StatusCell({
 
             setAnchorEl(e.currentTarget);
           }}
-          title="This WO missed its deadline. Update the Due Date to unlock status updates."
+          title="This WO missed its deadline. Update Schedule On to unlock status updates."
           className="group/cell flex w-full cursor-pointer items-center gap-1.5 whitespace-nowrap leading-none transition-opacity hover:opacity-80"
           style={{ fontSize: 12.5, fontWeight: 600, color: "var(--status-pastdue-text)" }}
         >
@@ -83,7 +83,7 @@ export function StatusCell({
                   color: "var(--status-pending-text)",
                 }}
               >
-                This work order is past due. Update the Due Date before the status can be updated.
+                This work order is past due. Update Schedule On before the status can be updated.
               </Text>
 
               <button
@@ -97,7 +97,7 @@ export function StatusCell({
                 }}
                 className="mt-2 block text-[11px] font-medium text-[var(--color-primary)]"
               >
-                Update Due Date →
+                Update Schedule On →
               </button>
             </div>
           </div>
diff --git a/src/domain/work-orders/utils/table-filter-utils.ts b/src/domain/work-orders/utils/table-filter-utils.ts
index 4a3046d3..6938c74c 100644
--- a/src/domain/work-orders/utils/table-filter-utils.ts
+++ b/src/domain/work-orders/utils/table-filter-utils.ts
@@ -12,18 +12,18 @@ import { weekRange } from "@/domain/work-orders/utils/list-week-utils";
 const TERMINAL_STATUSES = new Set(["Completed", "Canceled", "Done", "Cancelled"]);
 
 export function computeIsPastDue(row: WorkOrderTableRow): boolean {
-  if (!row.dueDate || TERMINAL_STATUSES.has(row.status)) {
+  if (!row.scheduledOn || TERMINAL_STATUSES.has(row.status)) {
     return false;
   }
   const today = new Date().toISOString().slice(0, 10);
-  return row.dueDate < today;
+  return row.scheduledOn.slice(0, 10) < today;
 }
 
 export function enrichTableRow(row: WorkOrderTableRow): WorkOrderTableRow {
   return {
     ...row,
-    // Recompute from dueDate (same date-only rule as BE). Avoid sticky
-    // `apiTrue || compute` so a future Due Date clears Past Due immediately.
+    // Recompute from Schedule On (SH-185). Avoid sticky `apiTrue || compute`
+    // so a future Schedule On clears Past Due immediately.
     isPastDue: computeIsPastDue(row),
   };
 }
diff --git a/src/test/app/(protected)/workorders/status-cell-past-due-copy.test.tsx b/src/test/app/(protected)/workorders/status-cell-past-due-copy.test.tsx
new file mode 100644
index 00000000..961e830c
--- /dev/null
+++ b/src/test/app/(protected)/workorders/status-cell-past-due-copy.test.tsx
@@ -0,0 +1,38 @@
+import { fireEvent, render, screen } from "@testing-library/react";
+import { describe, expect, it, vi } from "vitest";
+import { StatusCell } from "@/app/(protected)/workorders/_components/list/table/cells/status-cell";
+import type { WorkOrderTableRow } from "@/domain/work-orders/types/work-order-table-row";
+
+const pastDueRow = {
+  id: "wo-1",
+  status: "Scheduled",
+  dispatcherId: "",
+  dispatcherName: "",
+  company: "",
+  tech: "",
+  completedDate: "",
+  woNumber: "",
+  pm: "",
+  docStatus: "",
+  mediaCount: 0,
+  type: "PM",
+  isPastDue: true,
+  scheduledOn: "2026-06-01",
+  dueDate: "2026-08-01",
+} as WorkOrderTableRow;
+
+describe("StatusCell Past Due copy (SH-185)", () => {
+  it("directs the dispatcher to update Schedule On, not Due Date", () => {
+    render(<StatusCell wo={pastDueRow} onChangeStatus={vi.fn()} onOpenSlideOver={vi.fn()} />);
+
+    const trigger = screen.getByRole("button", { name: /past due/i });
+    expect(trigger.getAttribute("title") ?? "").toContain("Schedule On");
+    expect(trigger.getAttribute("title") ?? "").not.toMatch(/due date/i);
+
+    fireEvent.click(trigger);
+
+    expect(screen.getByText(/update schedule on before the status can be updated/i)).toBeTruthy();
+    expect(screen.getByRole("button", { name: /update schedule on/i })).toBeTruthy();
+    expect(screen.queryByText(/due date/i)).toBeNull();
+  });
+});
diff --git a/src/test/domain/work-orders/utils/table-filter-utils.test.ts b/src/test/domain/work-orders/utils/table-filter-utils.test.ts
index e3988d10..ea303e6c 100644
--- a/src/test/domain/work-orders/utils/table-filter-utils.test.ts
+++ b/src/test/domain/work-orders/utils/table-filter-utils.test.ts
@@ -156,43 +156,43 @@ describe("matchesAdvancedFilters", () => {
 });
 
 describe("computeIsPastDue", () => {
-  it("is true when dueDate is before today even if scheduledOn is future", () => {
+  it("is true when scheduledOn is before today even if dueDate is future", () => {
     expect(
       computeIsPastDue(
         makeRow({
-          dueDate: shiftIso(-1),
-          scheduledOn: shiftIso(5),
+          dueDate: shiftIso(5),
+          scheduledOn: shiftIso(-1),
           status: "Scheduled",
         }),
       ),
     ).toBe(true);
   });
 
-  it("is false when dueDate is future even if scheduledOn is past", () => {
+  it("is false when scheduledOn is future even if dueDate is past", () => {
     expect(
       computeIsPastDue(
         makeRow({
-          dueDate: shiftIso(5),
-          scheduledOn: shiftIso(-1),
+          dueDate: shiftIso(-1),
+          scheduledOn: shiftIso(5),
           status: "Incomplete",
         }),
       ),
     ).toBe(false);
   });
 
-  it("is false when dueDate is empty", () => {
+  it("is false when scheduledOn is empty", () => {
     expect(
       computeIsPastDue(
         makeRow({
-          dueDate: "",
-          scheduledOn: shiftIso(-3),
+          dueDate: shiftIso(-3),
+          scheduledOn: "",
           status: "Scheduled",
         }),
       ),
     ).toBe(false);
   });
 
-  it("is false for terminal statuses even with past dueDate", () => {
+  it("is false for terminal statuses even with past scheduledOn", () => {
     expect(
       computeIsPastDue(
         makeRow({
@@ -205,19 +205,19 @@ describe("computeIsPastDue", () => {
     expect(
       computeIsPastDue(
         makeRow({
-          dueDate: shiftIso(-2),
+          scheduledOn: shiftIso(-2),
           status: "Canceled",
         }),
       ),
     ).toBe(false);
   });
 
-  it("is false when dueDate is today", () => {
+  it("is false when scheduledOn is today", () => {
     expect(
       computeIsPastDue(
         makeRow({
-          dueDate: todayIso(),
-          scheduledOn: shiftIso(-1),
+          dueDate: shiftIso(-1),
+          scheduledOn: todayIso(),
           status: "Scheduled",
         }),
       ),
@@ -226,11 +226,11 @@ describe("computeIsPastDue", () => {
 });
 
 describe("enrichTableRow", () => {
-  it("recomputes isPastDue from dueDate and ignores sticky API true", () => {
+  it("recomputes isPastDue from scheduledOn and ignores sticky API true", () => {
     const enriched = enrichTableRow(
       makeRow({
-        dueDate: shiftIso(5),
-        scheduledOn: shiftIso(-1),
+        dueDate: shiftIso(-1),
+        scheduledOn: shiftIso(5),
         isPastDue: true,
         status: "Scheduled",
       }),
@@ -238,11 +238,11 @@ describe("enrichTableRow", () => {
     expect(enriched.isPastDue).toBe(false);
   });
 
-  it("sets isPastDue true from past dueDate even when API flag is false", () => {
+  it("sets isPastDue true from past scheduledOn even when API flag is false", () => {
     const enriched = enrichTableRow(
       makeRow({
-        dueDate: shiftIso(-1),
-        scheduledOn: shiftIso(5),
+        dueDate: shiftIso(5),
+        scheduledOn: shiftIso(-1),
         isPastDue: false,
         status: "Incomplete",
       }),