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index 6c0d002edbf..9ec263beb42 100644
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diff --git a/packages/desktop-client/src/components/settings/Experimental.tsx b/packages/desktop-client/src/components/settings/Experimental.tsx
index d0888e1a935..a194b56bc4d 100644
--- a/packages/desktop-client/src/components/settings/Experimental.tsx
+++ b/packages/desktop-client/src/components/settings/Experimental.tsx
@@ -116,6 +116,12 @@ export function ExperimentalFeatures() {
             >
               <Trans>Rule action templating</Trans>
             </FeatureToggle>
+            <FeatureToggle
+              flag="upcomingLengthAdjustment"
+              feedbackLink="https://github.com/actualbudget/actual/issues/3660"
+            >
+              <Trans>Scheduled transaction upcoming length adjustment</Trans>
+            </FeatureToggle>
           </View>
         ) : (
           <Link
diff --git a/packages/desktop-client/src/components/settings/Upcoming.tsx b/packages/desktop-client/src/components/settings/Upcoming.tsx
index 0f1409c75d3..684f57fb203 100644
--- a/packages/desktop-client/src/components/settings/Upcoming.tsx
+++ b/packages/desktop-client/src/components/settings/Upcoming.tsx
@@ -6,6 +6,7 @@ import { Column } from 'glamor/jsxstyle';
 
 import { type SyncedPrefs } from 'loot-core/types/prefs';
 
+import { useFeatureFlag } from '../../hooks/useFeatureFlag';
 import { useSyncedPref } from '../../hooks/useSyncedPref';
 import { type CSSProperties, theme } from '../../style';
 import { Button } from '../common/Button2';
@@ -37,9 +38,13 @@ export function UpcomingLengthSettings() {
     },
   };
 
+  const enabled = useFeatureFlag('upcomingLengthAdjustment');
+
   const location = useLocation();
   const [expanded, setExpanded] = useState(location.hash === '#upcomingLength');
 
+  if (!enabled) return null;
+
   return expanded ? (
     <Setting
       primaryAction={
diff --git a/packages/desktop-client/src/hooks/useFeatureFlag.ts b/packages/desktop-client/src/hooks/useFeatureFlag.ts
index 3975d2acec3..c733df9bcdf 100644
--- a/packages/desktop-client/src/hooks/useFeatureFlag.ts
+++ b/packages/desktop-client/src/hooks/useFeatureFlag.ts
@@ -8,6 +8,7 @@ const DEFAULT_FEATURE_FLAG_STATE: Record<FeatureFlag, boolean> = {
   spendingReport: false,
   dashboards: false,
   actionTemplating: false,
+  upcomingLengthAdjustment: false,
 };
 
 export function useFeatureFlag(name: FeatureFlag): boolean {
diff --git a/packages/loot-core/src/types/prefs.d.ts b/packages/loot-core/src/types/prefs.d.ts
index 8817cc3b509..8678cb0218c 100644
--- a/packages/loot-core/src/types/prefs.d.ts
+++ b/packages/loot-core/src/types/prefs.d.ts
@@ -3,7 +3,8 @@ export type FeatureFlag =
   | 'reportBudget'
   | 'goalTemplatesEnabled'
   | 'spendingReport'
-  | 'actionTemplating';
+  | 'actionTemplating'
+  | 'upcomingLengthAdjustment';
 
 /**
  * Cross-device preferences. These sync across devices when they are changed.
diff --git a/upcoming-release-notes/3651.md b/upcoming-release-notes/3651.md
new file mode 100644
index 00000000000..07e0be1653a
--- /dev/null
+++ b/upcoming-release-notes/3651.md
@@ -0,0 +1,6 @@
+---
+category: Maintenance
+authors: [ SamBobBarnes ]
+---
+
+Add feature flag for upcoming length adjustment setting.