diff --git a/apps/code/src/renderer/features/billing/stores/seatStore.test.ts b/apps/code/src/renderer/features/billing/stores/seatStore.test.ts
index 72e344b73..464d4e97d 100644
--- a/apps/code/src/renderer/features/billing/stores/seatStore.test.ts
+++ b/apps/code/src/renderer/features/billing/stores/seatStore.test.ts
@@ -45,12 +45,17 @@ vi.mock("@renderer/trpc", () => ({
   },
 }));
 
+vi.mock("@utils/analytics", () => ({ track: vi.fn() }));
+
 import { trpcClient } from "@renderer/trpc";
+import { ANALYTICS_EVENTS } from "@shared/types/analytics";
+import { track } from "@utils/analytics";
 import { useSeatStore } from "./seatStore";
 
 const mockInvalidatePlanCache = vi.mocked(
   trpcClient.llmGateway.invalidatePlanCache.mutate,
 );
+const mockTrack = vi.mocked(track);
 
 function makeSeat(overrides: Partial<SeatData> = {}): SeatData {
   return {
@@ -170,6 +175,10 @@ describe("seatStore", () => {
       expect(client.upgradeSeat).toHaveBeenCalledWith(PLAN_PRO);
       expect(useSeatStore.getState().seat).toEqual(proSeat);
       expect(mockInvalidatePlanCache).toHaveBeenCalled();
+      expect(mockTrack).toHaveBeenCalledWith(
+        ANALYTICS_EVENTS.SUBSCRIPTION_STARTED,
+        { plan_key: PLAN_PRO, previous_plan_key: PLAN_FREE },
+      );
     });
 
     it("no-ops when already on pro", async () => {
@@ -183,6 +192,7 @@ describe("seatStore", () => {
       expect(client.upgradeSeat).not.toHaveBeenCalled();
       expect(client.createSeat).not.toHaveBeenCalled();
       expect(useSeatStore.getState().seat).toEqual(proSeat);
+      expect(mockTrack).not.toHaveBeenCalled();
     });
 
     it("upgrades alpha pro seat to paid pro", async () => {
@@ -197,6 +207,10 @@ describe("seatStore", () => {
 
       expect(client.upgradeSeat).toHaveBeenCalledWith(PLAN_PRO);
       expect(useSeatStore.getState().seat).toEqual(proSeat);
+      expect(mockTrack).toHaveBeenCalledWith(
+        ANALYTICS_EVENTS.SUBSCRIPTION_STARTED,
+        { plan_key: PLAN_PRO, previous_plan_key: PLAN_PRO_ALPHA },
+      );
     });
 
     it("creates pro seat when none exists", async () => {
@@ -209,21 +223,66 @@ describe("seatStore", () => {
 
       expect(client.createSeat).toHaveBeenCalledWith(PLAN_PRO);
       expect(mockInvalidatePlanCache).toHaveBeenCalled();
+      expect(mockTrack).toHaveBeenCalledWith(
+        ANALYTICS_EVENTS.SUBSCRIPTION_STARTED,
+        { plan_key: PLAN_PRO },
+      );
     });
   });
 
   describe("cancelSeat", () => {
     it("cancels and re-fetches seat", async () => {
-      const canceledSeat = makeSeat({ status: "canceling" });
+      const proSeat = makeSeat({ plan_key: PLAN_PRO });
+      const cancelingSeat = makeSeat({
+        plan_key: PLAN_PRO,
+        status: "canceling",
+      });
+      useSeatStore.setState({ seat: proSeat });
       const client = mockClient({
-        getMySeat: vi.fn().mockResolvedValue(canceledSeat),
+        getMySeat: vi.fn().mockResolvedValue(cancelingSeat),
       });
 
       await useSeatStore.getState().cancelSeat();
 
       expect(client.cancelSeat).toHaveBeenCalled();
-      expect(useSeatStore.getState().seat).toEqual(canceledSeat);
+      expect(useSeatStore.getState().seat).toEqual(cancelingSeat);
       expect(mockInvalidatePlanCache).toHaveBeenCalled();
+      expect(mockTrack).toHaveBeenCalledWith(
+        ANALYTICS_EVENTS.SUBSCRIPTION_CANCELLED,
+        { plan_key: PLAN_PRO },
+      );
+    });
+
+    it("falls back to API response plan_key when store seat is null", async () => {
+      const cancelingSeat = makeSeat({
+        plan_key: PLAN_PRO,
+        status: "canceling",
+      });
+      const client = mockClient({
+        getMySeat: vi.fn().mockResolvedValue(cancelingSeat),
+      });
+
+      await useSeatStore.getState().cancelSeat();
+
+      expect(client.cancelSeat).toHaveBeenCalled();
+      expect(mockTrack).toHaveBeenCalledWith(
+        ANALYTICS_EVENTS.SUBSCRIPTION_CANCELLED,
+        { plan_key: PLAN_PRO },
+      );
+    });
+
+    it("skips tracking when no plan_key is available", async () => {
+      const client = mockClient({
+        getMySeat: vi.fn().mockResolvedValue(null),
+      });
+
+      await useSeatStore.getState().cancelSeat();
+
+      expect(client.cancelSeat).toHaveBeenCalled();
+      expect(mockTrack).not.toHaveBeenCalledWith(
+        ANALYTICS_EVENTS.SUBSCRIPTION_CANCELLED,
+        expect.anything(),
+      );
     });
   });
 
diff --git a/apps/code/src/renderer/features/billing/stores/seatStore.ts b/apps/code/src/renderer/features/billing/stores/seatStore.ts
index f5064416b..e61399f83 100644
--- a/apps/code/src/renderer/features/billing/stores/seatStore.ts
+++ b/apps/code/src/renderer/features/billing/stores/seatStore.ts
@@ -4,8 +4,10 @@ import {
   SeatSubscriptionRequiredError,
 } from "@renderer/api/posthogClient";
 import { trpcClient } from "@renderer/trpc";
+import { ANALYTICS_EVENTS } from "@shared/types/analytics";
 import type { SeatData } from "@shared/types/seat";
 import { PLAN_FREE, PLAN_PRO } from "@shared/types/seat";
+import { track } from "@utils/analytics";
 import { logger } from "@utils/logger";
 import { queryClient } from "@utils/queryClient";
 import { create } from "zustand";
@@ -186,6 +188,10 @@ export const useSeatStore = create<SeatStore>()((set, get) => ({
           isLoading: false,
           billingOrgId: seat.organization_id ?? null,
         });
+        track(ANALYTICS_EVENTS.SUBSCRIPTION_STARTED, {
+          plan_key: seat.plan_key,
+          previous_plan_key: existing.plan_key,
+        });
         invalidatePlanCache();
         return;
       }
@@ -196,6 +202,9 @@ export const useSeatStore = create<SeatStore>()((set, get) => ({
         isLoading: false,
         billingOrgId: seat.organization_id ?? null,
       });
+      track(ANALYTICS_EVENTS.SUBSCRIPTION_STARTED, {
+        plan_key: seat.plan_key,
+      });
       invalidatePlanCache();
     } catch (error) {
       handleSeatError(error, set);
@@ -206,6 +215,7 @@ export const useSeatStore = create<SeatStore>()((set, get) => ({
     set({ isLoading: true, error: null, redirectUrl: null });
     try {
       const client = await getClient();
+      const previousPlanKey = get().seat?.plan_key;
       await client.cancelSeat();
       const seat = await client.getMySeat();
       set({
@@ -214,6 +224,12 @@ export const useSeatStore = create<SeatStore>()((set, get) => ({
         isLoading: false,
         billingOrgId: seat?.organization_id ?? null,
       });
+      const cancelledPlanKey = previousPlanKey ?? seat?.plan_key;
+      if (cancelledPlanKey) {
+        track(ANALYTICS_EVENTS.SUBSCRIPTION_CANCELLED, {
+          plan_key: cancelledPlanKey,
+        });
+      }
       invalidatePlanCache();
     } catch (error) {
       handleSeatError(error, set);
diff --git a/apps/code/src/shared/types/analytics.ts b/apps/code/src/shared/types/analytics.ts
index 066452850..8679f18ad 100644
--- a/apps/code/src/shared/types/analytics.ts
+++ b/apps/code/src/shared/types/analytics.ts
@@ -331,6 +331,16 @@ export interface SetupSkippedProperties {
   entry_point: "during_scan" | "after_done";
 }
 
+// Subscription / billing events
+export interface SubscriptionStartedProperties {
+  plan_key: string;
+  previous_plan_key?: string;
+}
+
+export interface SubscriptionCancelledProperties {
+  plan_key: string;
+}
+
 // Event names as constants
 export const ANALYTICS_EVENTS = {
   // App lifecycle
@@ -419,6 +429,10 @@ export const ANALYTICS_EVENTS = {
   // Prompt history events
   PROMPT_HISTORY_OPENED: "Prompt history opened",
   PROMPT_HISTORY_SELECTED: "Prompt history selected",
+
+  // Subscription events
+  SUBSCRIPTION_STARTED: "Subscription started",
+  SUBSCRIPTION_CANCELLED: "Subscription cancelled",
 } as const;
 
 // Event property mapping
@@ -502,4 +516,8 @@ export type EventPropertyMap = {
   // Prompt history events
   [ANALYTICS_EVENTS.PROMPT_HISTORY_OPENED]: PromptHistoryOpenedProperties;
   [ANALYTICS_EVENTS.PROMPT_HISTORY_SELECTED]: PromptHistorySelectedProperties;
+
+  // Subscription events
+  [ANALYTICS_EVENTS.SUBSCRIPTION_STARTED]: SubscriptionStartedProperties;
+  [ANALYTICS_EVENTS.SUBSCRIPTION_CANCELLED]: SubscriptionCancelledProperties;
 };