diff --git a/coderd/aibridgedserver/aibridgedserver_test.go b/coderd/aibridgedserver/aibridgedserver_test.go
index da8f341bdf5..1e54445b7ab 100644
--- a/coderd/aibridgedserver/aibridgedserver_test.go
+++ b/coderd/aibridgedserver/aibridgedserver_test.go
@@ -2454,6 +2454,10 @@ func TestRecordTokenUsageBudgetNotifications(t *testing.T) {
 				require.Equal(t, wantThreshold[tmpl], sent[0].Labels["threshold"])
 				require.Equal(t, "$100.00", sent[0].Labels["limit"])
 				require.Equal(t, "Engineering", sent[0].Labels["effective_group_name"])
+				// The interception is recorded at 2026-06-25, so its budget
+				// period runs June 1 - July 1, 2026.
+				require.Equal(t, "June 1, 2026", sent[0].Labels["period_start"])
+				require.Equal(t, "July 1, 2026", sent[0].Labels["period_end"])
 			}
 		})
 	}
diff --git a/coderd/aibridgedserver/notifications.go b/coderd/aibridgedserver/notifications.go
index 3e00c6d848d..4481401408f 100644
--- a/coderd/aibridgedserver/notifications.go
+++ b/coderd/aibridgedserver/notifications.go
@@ -49,6 +49,10 @@ type budgetThresholdCrossing struct {
 	spendLimitMicros     int64
 	thresholdPercent     int
 	notificationTemplate uuid.UUID
+	// periodStart and periodEnd bound the budget period [start, end) the
+	// crossing occurred in.
+	periodStart time.Time
+	periodEnd   time.Time
 }
 
 // detectBudgetThresholdCrossings checks whether this interception's cost pushed
@@ -94,6 +98,8 @@ func (s *Server) detectBudgetThresholdCrossings(ctx context.Context, tx database
 				spendLimitMicros:     limit,
 				thresholdPercent:     t.percent,
 				notificationTemplate: t.notificationTemplate,
+				periodStart:          period.Start,
+				periodEnd:            period.End,
 			})
 		}
 	}
@@ -113,6 +119,10 @@ func (s *Server) notifyBudgetThresholdCrossing(ctx context.Context, crossing bud
 		"limit":                formatSpendLimit(crossing.spendLimitMicros),
 		"period":               s.budgetPeriod.Adjective(),
 		"effective_group_name": group.Name,
+		// Both bounds carry the year so a period straddling a year boundary
+		// (e.g. December 1, 2026 - January 1, 2027) is unambiguous.
+		"period_start": crossing.periodStart.UTC().Format("January 2, 2006"),
+		"period_end":   crossing.periodEnd.UTC().Format("January 2, 2006"),
 	}
 
 	//nolint:gocritic // Enqueuing notifications requires the notifier actor.
diff --git a/coderd/database/migrations/000552_ai_budget_notifications.up.sql b/coderd/database/migrations/000552_ai_budget_notifications.up.sql
index 1816a5a2ae4..61535f4f72d 100644
--- a/coderd/database/migrations/000552_ai_budget_notifications.up.sql
+++ b/coderd/database/migrations/000552_ai_budget_notifications.up.sql
@@ -13,7 +13,11 @@ VALUES (
     'b5db9597-de2a-4dea-87e9-25cee6906b86',
     'AI Budget Warning',
     E'You''re approaching your {{.Labels.period}} AI budget limit',
-    E'You have used more than {{.Labels.threshold}}% of your {{.Labels.period}} AI budget ({{.Labels.limit}}). Effective group: **{{.Labels.effective_group_name}}**.',
+    $$You have used more than {{.Labels.threshold}}% of your {{.Labels.period}} AI budget ({{.Labels.limit}}).
+
+Effective group: **{{.Labels.effective_group_name}}**
+
+AI budget period: {{.Labels.period_start}} - {{.Labels.period_end}}$$,
     '[]'::jsonb,
     'AI Cost Control Events',
     NULL,
@@ -36,7 +40,11 @@ VALUES (
     'cdcf2ecd-f003-4169-9800-abb2661ea522',
     'AI Budget Limit Reached',
     E'You''ve reached your {{.Labels.period}} AI budget limit',
-    E'You have reached your {{.Labels.period}} AI budget limit ({{.Labels.limit}}). Subsequent requests will be blocked. Effective group: **{{.Labels.effective_group_name}}**.',
+    $$You have reached your {{.Labels.period}} AI budget limit ({{.Labels.limit}}). Subsequent requests will be blocked.
+
+Effective group: **{{.Labels.effective_group_name}}**
+
+AI budget period: {{.Labels.period_start}} - {{.Labels.period_end}}$$,
     '[]'::jsonb,
     'AI Cost Control Events',
     NULL,
diff --git a/coderd/notifications/notifications_test.go b/coderd/notifications/notifications_test.go
index c72f1af4562..ac26ecca9fa 100644
--- a/coderd/notifications/notifications_test.go
+++ b/coderd/notifications/notifications_test.go
@@ -1473,6 +1473,8 @@ func TestNotificationTemplates_Golden(t *testing.T) {
 					"limit":                "$1000.00",
 					"period":               "monthly",
 					"effective_group_name": "Engineering",
+					"period_start":         "July 1, 2026",
+					"period_end":           "August 1, 2026",
 				},
 				Data: map[string]any{},
 			},
@@ -1489,6 +1491,8 @@ func TestNotificationTemplates_Golden(t *testing.T) {
 					"limit":                "$1000.00",
 					"period":               "monthly",
 					"effective_group_name": "Engineering",
+					"period_start":         "July 1, 2026",
+					"period_end":           "August 1, 2026",
 				},
 				Data: map[string]any{},
 			},
diff --git a/coderd/notifications/testdata/rendered-templates/smtp/TemplateAIBudgetLimitReachedUser.html.golden b/coderd/notifications/testdata/rendered-templates/smtp/TemplateAIBudgetLimitReachedUser.html.golden
index 2e85771d84b..37db6f733cc 100644
--- a/coderd/notifications/testdata/rendered-templates/smtp/TemplateAIBudgetLimitReachedUser.html.golden
+++ b/coderd/notifications/testdata/rendered-templates/smtp/TemplateAIBudgetLimitReachedUser.html.golden
@@ -13,7 +13,11 @@ Content-Type: text/plain; charset=UTF-8
 Hi Bobby,
 
 You have reached your monthly AI budget limit ($1000.00). Subsequent reques=
-ts will be blocked. Effective group: Engineering.
+ts will be blocked.
+
+Effective group: Engineering
+
+AI budget period: July 1, 2026 - August 1, 2026
 
 
 --bbe61b741255b6098bb6b3c1f41b885773df633cb18d2a3002b68e4bc9c4
@@ -46,8 +50,11 @@ argin: 8px 0 32px; line-height: 1.5;">
       <div style=3D"line-height: 1.5;">
         <p>Hi Bobby,</p>
         <p>You have reached your monthly AI budget limit ($1000.00). Subseq=
-uent requests will be blocked. Effective group: <strong>Engineering</strong=
->.</p>
+uent requests will be blocked.</p>
+
+<p>Effective group: <strong>Engineering</strong></p>
+
+<p>AI budget period: July 1, 2026 - August 1, 2026</p>
       </div>
       <div style=3D"text-align: center; margin-top: 32px;">
        =20
diff --git a/coderd/notifications/testdata/rendered-templates/smtp/TemplateAIBudgetWarningUser.html.golden b/coderd/notifications/testdata/rendered-templates/smtp/TemplateAIBudgetWarningUser.html.golden
index 7fb9cdac3ea..3927ab28e31 100644
--- a/coderd/notifications/testdata/rendered-templates/smtp/TemplateAIBudgetWarningUser.html.golden
+++ b/coderd/notifications/testdata/rendered-templates/smtp/TemplateAIBudgetWarningUser.html.golden
@@ -12,8 +12,11 @@ Content-Type: text/plain; charset=UTF-8
 
 Hi Bobby,
 
-You have used more than 85% of your monthly AI budget ($1000.00). Effective=
- group: Engineering.
+You have used more than 85% of your monthly AI budget ($1000.00).
+
+Effective group: Engineering
+
+AI budget period: July 1, 2026 - August 1, 2026
 
 
 --bbe61b741255b6098bb6b3c1f41b885773df633cb18d2a3002b68e4bc9c4
@@ -46,7 +49,11 @@ argin: 8px 0 32px; line-height: 1.5;">
       <div style=3D"line-height: 1.5;">
         <p>Hi Bobby,</p>
         <p>You have used more than 85% of your monthly AI budget ($1000.00)=
-. Effective group: <strong>Engineering</strong>.</p>
+.</p>
+
+<p>Effective group: <strong>Engineering</strong></p>
+
+<p>AI budget period: July 1, 2026 - August 1, 2026</p>
       </div>
       <div style=3D"text-align: center; margin-top: 32px;">
        =20
diff --git a/coderd/notifications/testdata/rendered-templates/webhook/TemplateAIBudgetLimitReachedUser.json.golden b/coderd/notifications/testdata/rendered-templates/webhook/TemplateAIBudgetLimitReachedUser.json.golden
index 87774ee95c8..4c3470574d0 100644
--- a/coderd/notifications/testdata/rendered-templates/webhook/TemplateAIBudgetLimitReachedUser.json.golden
+++ b/coderd/notifications/testdata/rendered-templates/webhook/TemplateAIBudgetLimitReachedUser.json.golden
@@ -14,6 +14,8 @@
       "effective_group_name": "Engineering",
       "limit": "$1000.00",
       "period": "monthly",
+      "period_end": "August 1, 2026",
+      "period_start": "July 1, 2026",
       "threshold": "100"
     },
     "data": {},
@@ -21,6 +23,6 @@
   },
   "title": "You've reached your monthly AI budget limit",
   "title_markdown": "You've reached your monthly AI budget limit",
-  "body": "You have reached your monthly AI budget limit ($1000.00). Subsequent requests will be blocked. Effective group: Engineering.",
-  "body_markdown": "You have reached your monthly AI budget limit ($1000.00). Subsequent requests will be blocked. Effective group: **Engineering**."
+  "body": "You have reached your monthly AI budget limit ($1000.00). Subsequent requests will be blocked.\n\nEffective group: Engineering\n\nAI budget period: July 1, 2026 - August 1, 2026",
+  "body_markdown": "You have reached your monthly AI budget limit ($1000.00). Subsequent requests will be blocked.\n\nEffective group: **Engineering**\n\nAI budget period: July 1, 2026 - August 1, 2026"
 }
\ No newline at end of file
diff --git a/coderd/notifications/testdata/rendered-templates/webhook/TemplateAIBudgetWarningUser.json.golden b/coderd/notifications/testdata/rendered-templates/webhook/TemplateAIBudgetWarningUser.json.golden
index 6624805af81..b9b082b9cbe 100644
--- a/coderd/notifications/testdata/rendered-templates/webhook/TemplateAIBudgetWarningUser.json.golden
+++ b/coderd/notifications/testdata/rendered-templates/webhook/TemplateAIBudgetWarningUser.json.golden
@@ -14,6 +14,8 @@
       "effective_group_name": "Engineering",
       "limit": "$1000.00",
       "period": "monthly",
+      "period_end": "August 1, 2026",
+      "period_start": "July 1, 2026",
       "threshold": "85"
     },
     "data": {},
@@ -21,6 +23,6 @@
   },
   "title": "You're approaching your monthly AI budget limit",
   "title_markdown": "You're approaching your monthly AI budget limit",
-  "body": "You have used more than 85% of your monthly AI budget ($1000.00). Effective group: Engineering.",
-  "body_markdown": "You have used more than 85% of your monthly AI budget ($1000.00). Effective group: **Engineering**."
+  "body": "You have used more than 85% of your monthly AI budget ($1000.00).\n\nEffective group: Engineering\n\nAI budget period: July 1, 2026 - August 1, 2026",
+  "body_markdown": "You have used more than 85% of your monthly AI budget ($1000.00).\n\nEffective group: **Engineering**\n\nAI budget period: July 1, 2026 - August 1, 2026"
 }
\ No newline at end of file