diff --git a/.server-changes/billing-alert-preview-current-limit.md b/.server-changes/billing-alert-preview-current-limit.md
new file mode 100644
index 0000000000..9ab90e952e
--- /dev/null
+++ b/.server-changes/billing-alert-preview-current-limit.md
@@ -0,0 +1,6 @@
+---
+area: webapp
+type: fix
+---
+
+Raising your billing limit now updates the alert threshold preview amounts right away, instead of showing figures based on the previous limit until you save your alerts again.
diff --git a/apps/webapp/app/components/billing/billingAlertsFormat.ts b/apps/webapp/app/components/billing/billingAlertsFormat.ts
index dc99c49ff1..27b2fe035c 100644
--- a/apps/webapp/app/components/billing/billingAlertsFormat.ts
+++ b/apps/webapp/app/components/billing/billingAlertsFormat.ts
@@ -315,9 +315,6 @@ export function getAlertPreviewLimitCents(
   planLimitCents: number
 ): number {
   const amountCents = getSavedAlertAmountCents(alerts);
-  if (amountCents > 0 && percentageAlertLevelsToUiThresholds(alerts.alertLevels).length > 0) {
-    return amountCents;
-  }
   if (percentageAlertAmountMatches(amountCents, effectiveLimitCents, planLimitCents)) {
     return amountCents;
   }
diff --git a/apps/webapp/test/billingAlertsFormat.test.ts b/apps/webapp/test/billingAlertsFormat.test.ts
index 7ef84770d7..275dc5adfb 100644
--- a/apps/webapp/test/billingAlertsFormat.test.ts
+++ b/apps/webapp/test/billingAlertsFormat.test.ts
@@ -90,6 +90,18 @@ describe("billingAlertsFormat", () => {
     ).toBe(10_000);
   });
 
+  it("previews percentage alerts against the current limit after it is raised", () => {
+    // Alerts were saved against an old $30 limit; the customer has since raised
+    // it to $300. The preview should follow the current limit, not the snapshot.
+    expect(
+      getAlertPreviewLimitCents(
+        { amount: 30, emails: [], alertLevels: [0.75, 0.9] },
+        30_000,
+        10_000
+      )
+    ).toBe(30_000);
+  });
+
   it("normalizes legacy API alerts with dollar amount field and whole percents", () => {
     expect(
       normalizeBillingAlertsFromApi(