diff --git a/src/services/TaskCalendarSyncService.ts b/src/services/TaskCalendarSyncService.ts
index cc4076bb..03d848ea 100644
--- a/src/services/TaskCalendarSyncService.ts
+++ b/src/services/TaskCalendarSyncService.ts
@@ -2425,6 +2425,16 @@ export class TaskCalendarSyncService {
 		}
 
 		const settings = this.plugin.settings.googleCalendarExport;
+		// If the user has not enabled Google Calendar export at all, do nothing
+		// and do not queue. The queue is for transient failures that might be
+		// recoverable (auth expired, rate limited, target calendar temporarily
+		// missing). When the user has opted out of the feature entirely, every
+		// eligible task creation would otherwise pollute the queue with an
+		// entry that will never be processed (issue #2040).
+		if (!settings.enabled) {
+			return true;
+		}
+
 		const existingEventId = this.getTaskEventId(task);
 		const targetCalendarId = settings.targetCalendarId;
 
diff --git a/tests/unit/issues/issue-2040-google-calendar-sync-queue.test.ts b/tests/unit/issues/issue-2040-google-calendar-sync-queue.test.ts
new file mode 100644
index 00000000..54e34e09
--- /dev/null
+++ b/tests/unit/issues/issue-2040-google-calendar-sync-queue.test.ts
@@ -0,0 +1,132 @@
+import { TaskCalendarSyncService } from "../../../src/services/TaskCalendarSyncService";
+import type TaskNotesPlugin from "../../../src/main";
+import type { TaskInfo } from "../../../src/types/TaskInfo";
+
+/**
+ * Regression test for issue #2040:
+ * "[Bug]: googleCalendarSyncQueue fills up without a calendar configured"
+ *
+ * Expected behavior:
+ *   When the user has not enabled Google Calendar export in settings
+ *   (settings.googleCalendarExport.enabled === false), creating/updating
+ *   tasks must NOT add entries to googleCalendarSyncQueue. The queue is
+ *   intended for transient failures (auth expired, rate limited, target
+ *   calendar temporarily missing) and should never grow when the user has
+ *   opted out of the feature entirely.
+ *
+ * Previous (buggy) behavior:
+ *   TaskCreationService would call syncTaskToCalendar on every eligible
+ *   task (any task with a scheduled or due date). syncTaskToCalendar would
+ *   reach the `if (!this.isEnabled())` branch, which called queueTaskSync
+ *   with "Google Calendar sync is not ready". Every task creation
+ *   therefore appended a queue entry that nothing would ever clear,
+ *   polluting data.json on every commit.
+ *
+ * Fix:
+ *   Early-return from syncTaskToCalendar when
+ *   settings.googleCalendarExport.enabled === false, before any queue
+ *   interaction.
+ */
+
+function makePlugin(enabled: boolean, syncOnTaskCreate = true): TaskNotesPlugin {
+	return {
+		settings: {
+			googleCalendarExport: {
+				enabled,
+				syncOnTaskCreate,
+				targetCalendarId: enabled ? "cal-1" : "",
+				syncTrigger: "scheduled",
+			},
+		},
+		loadData: jest.fn().mockResolvedValue({}),
+	} as unknown as TaskNotesPlugin;
+}
+
+function makeTask(overrides: Partial<TaskInfo> = {}): TaskInfo {
+	return {
+		path: "tasks/foo.md",
+		title: "Foo",
+		status: "open",
+		priority: "normal",
+		archived: false,
+		scheduled: "2026-07-01",
+		tags: [],
+		...overrides,
+	} as unknown as TaskInfo;
+}
+
+describe("Issue #2040: syncTaskToCalendar does not queue when Google Calendar export is disabled", () => {
+	it("returns true and does not call queueTaskSync when export is disabled", async () => {
+		const plugin = makePlugin(false);
+
+		// Spy on the private queueTaskSync method via prototype.
+		const queueSpy = jest
+			.spyOn(TaskCalendarSyncService.prototype as any, "queueTaskSync")
+			.mockResolvedValue(undefined);
+
+		const service = new TaskCalendarSyncService(
+			plugin,
+			{} as any, // googleCalendarService
+		);
+
+		const result = await (service as any).syncTaskToCalendar(makeTask());
+
+		expect(result).toBe(true);
+		expect(queueSpy).not.toHaveBeenCalled();
+		queueSpy.mockRestore();
+	});
+
+	it("still calls queueTaskSync for transient failures when export IS enabled", async () => {
+		// When enabled === true but isEnabled() returns false (e.g. OAuth not
+		// connected), the existing queue-on-failure behavior is preserved.
+		const plugin = makePlugin(true);
+
+		const queueSpy = jest
+			.spyOn(TaskCalendarSyncService.prototype as any, "queueTaskSync")
+			.mockResolvedValue(undefined);
+
+		// Force isEnabled() to return false by stubbing it.
+		const isEnabledSpy = jest
+			.spyOn(TaskCalendarSyncService.prototype as any, "isEnabled")
+			.mockReturnValue(false);
+
+		const service = new TaskCalendarSyncService(
+			plugin,
+			{} as any,
+		);
+
+		const result = await (service as any).syncTaskToCalendar(makeTask());
+
+		expect(result).toBe(false);
+		expect(queueSpy).toHaveBeenCalledWith(
+			"tasks/foo.md",
+			expect.objectContaining({ message: "Google Calendar sync is not ready" }),
+		);
+
+		queueSpy.mockRestore();
+		isEnabledSpy.mockRestore();
+	});
+
+	it("returns true for ineligible tasks even when export is disabled (no-op)", async () => {
+		// Tasks without scheduled/due dates should not be queued regardless.
+		const plugin = makePlugin(false);
+
+		const queueSpy = jest
+			.spyOn(TaskCalendarSyncService.prototype as any, "queueTaskSync")
+			.mockResolvedValue(undefined);
+
+		const service = new TaskCalendarSyncService(
+			plugin,
+			{} as any,
+		);
+
+		const ineligibleTask = makeTask({ scheduled: undefined, due: undefined });
+		// The early-return for !enabled should fire before the eligibility
+		// check, but we still expect no queue interaction either way.
+		const result = await (service as any).syncTaskToCalendar(ineligibleTask);
+
+		expect(result).toBe(true);
+		expect(queueSpy).not.toHaveBeenCalled();
+		queueSpy.mockRestore();
+	});
+});
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