diff --git a/src/components/work/__tests__/work-tracker-delete.test.tsx b/src/components/work/__tests__/work-tracker-delete.test.tsx
new file mode 100644
index 0000000..88d5507
--- /dev/null
+++ b/src/components/work/__tests__/work-tracker-delete.test.tsx
@@ -0,0 +1,77 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { render, screen, cleanup, fireEvent, waitFor } from "@testing-library/react";
+import { WorkTracker } from "../work-tracker";
+
+vi.mock("next/navigation", () => ({ useRouter: () => ({ refresh: mockRefresh }) }));
+vi.mock("sonner", () => ({ toast: { success: vi.fn(), error: vi.fn() } }));
+
+import { toast } from "sonner";
+
+const mockRefresh = vi.fn();
+
+const baseProps = {
+  jobName: "Cafe",
+  hourlyRate: 15,
+  weeklyTarget: 20,
+  enableExpenseTracking: true,
+  todayHours: 0,
+  weekHours: 0,
+  monthHours: 0,
+  sessions: [{ _id: "s1", date: "2026-01-01", hours: 4, note: "", jobName: "Cafe" }],
+  expenses: [{ _id: "e1", date: "2026-01-01", amount: 10, currency: "USD", description: "Gas", category: "other", reimbursed: false }],
+  routes: [{ _id: "r1", date: "2026-01-01", origin: "A", destination: "B", distanceKm: 5, note: "" }],
+  gasPrice: 1,
+  carConsumption: 5,
+  currency: "USD",
+};
+
+describe("WorkTracker delete handlers", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  afterEach(() => {
+    cleanup();
+  });
+
+  const cases = [
+    { label: "Delete session", tab: null },
+    { label: "Delete expense", tab: "Expenses" },
+    { label: "Delete route", tab: "Routes & Gas" },
+  ];
+
+  for (const { label, tab } of cases) {
+    const openTab = () => {
+      if (tab) fireEvent.click(screen.getByRole("button", { name: tab }));
+    };
+
+    it(`shows an error toast and does not refresh when ${label.toLowerCase()} fails`, async () => {
+      global.fetch = vi.fn().mockResolvedValue({ ok: false }) as unknown as typeof fetch;
+      render(<WorkTracker {...baseProps} />);
+      openTab();
+      fireEvent.click(screen.getByLabelText(label));
+      await waitFor(() => expect(toast.error).toHaveBeenCalled());
+      expect(toast.success).not.toHaveBeenCalled();
+      expect(mockRefresh).not.toHaveBeenCalled();
+    });
+
+    it(`shows a success toast and refreshes when ${label.toLowerCase()} succeeds`, async () => {
+      global.fetch = vi.fn().mockResolvedValue({ ok: true }) as unknown as typeof fetch;
+      render(<WorkTracker {...baseProps} />);
+      openTab();
+      fireEvent.click(screen.getByLabelText(label));
+      await waitFor(() => expect(toast.success).toHaveBeenCalled());
+      expect(toast.error).not.toHaveBeenCalled();
+      expect(mockRefresh).toHaveBeenCalled();
+    });
+
+    it(`shows an error toast when the ${label.toLowerCase()} fetch rejects`, async () => {
+      global.fetch = vi.fn().mockRejectedValue(new Error("network error")) as unknown as typeof fetch;
+      render(<WorkTracker {...baseProps} />);
+      openTab();
+      fireEvent.click(screen.getByLabelText(label));
+      await waitFor(() => expect(toast.error).toHaveBeenCalled());
+      expect(mockRefresh).not.toHaveBeenCalled();
+    });
+  }
+});
diff --git a/src/components/work/work-tracker.tsx b/src/components/work/work-tracker.tsx
index 6d99521..d8f3bda 100644
--- a/src/components/work/work-tracker.tsx
+++ b/src/components/work/work-tracker.tsx
@@ -242,9 +242,17 @@ export function WorkTracker({
                       size="icon"
                       aria-label="Delete session"
                       onClick={async () => {
-                        await fetch(`/api/work/sessions/${s._id}`, { method: "DELETE" });
-                        toast.success("Session deleted");
-                        router.refresh();
+                        try {
+                          const res = await fetch(`/api/work/sessions/${s._id}`, { method: "DELETE" });
+                          if (res.ok) {
+                            toast.success("Session deleted");
+                            router.refresh();
+                          } else {
+                            toast.error("Failed to delete session");
+                          }
+                        } catch {
+                          toast.error("Failed to delete session");
+                        }
                       }}
                       className="h-7 w-7 text-[var(--text-muted)] hover:text-destructive"
                     >
@@ -329,9 +337,17 @@ export function WorkTracker({
                       size="icon"
                       aria-label="Delete expense"
                       onClick={async () => {
-                        await fetch(`/api/expenses/${e._id}`, { method: "DELETE" });
-                        toast.success("Expense deleted");
-                        router.refresh();
+                        try {
+                          const res = await fetch(`/api/expenses/${e._id}`, { method: "DELETE" });
+                          if (res.ok) {
+                            toast.success("Expense deleted");
+                            router.refresh();
+                          } else {
+                            toast.error("Failed to delete expense");
+                          }
+                        } catch {
+                          toast.error("Failed to delete expense");
+                        }
                       }}
                       className="h-7 w-7 text-[var(--text-muted)] hover:text-destructive"
                     >
@@ -426,9 +442,17 @@ export function WorkTracker({
                       size="icon"
                       aria-label="Delete route"
                       onClick={async () => {
-                        await fetch(`/api/routes/${r._id}`, { method: "DELETE" });
-                        toast.success("Route deleted");
-                        router.refresh();
+                        try {
+                          const res = await fetch(`/api/routes/${r._id}`, { method: "DELETE" });
+                          if (res.ok) {
+                            toast.success("Route deleted");
+                            router.refresh();
+                          } else {
+                            toast.error("Failed to delete route");
+                          }
+                        } catch {
+                          toast.error("Failed to delete route");
+                        }
                       }}
                       className="h-7 w-7 text-[var(--text-muted)] hover:text-destructive"
                     >