diff --git a/src/paperless_ai/ai_classifier.py b/src/paperless_ai/ai_classifier.py
index f07f5eacc..7de19629a 100644
--- a/src/paperless_ai/ai_classifier.py
+++ b/src/paperless_ai/ai_classifier.py
@@ -6,12 +6,12 @@ from django.conf import settings
 from django.contrib.auth.models import User
 
 from documents.models import Document
-from documents.permissions import get_objects_for_user_owner_aware
 from paperless.config import AIConfig
 from paperless_ai.client import AIClient
 from paperless_ai.db import db_connection_released
 from paperless_ai.indexing import query_similar_documents
 from paperless_ai.indexing import truncate_content
+from paperless_ai.indexing import visible_document_ids_for_user
 from paperless_ai.taxonomy import format_hints_for_prompt
 
 if TYPE_CHECKING:
@@ -109,20 +109,7 @@ def get_context_for_document(
     user: User | None = None,
     max_docs: int = 5,
 ) -> str:
-    visible_documents = (
-        get_objects_for_user_owner_aware(
-            user,
-            "view_document",
-            Document,
-        )
-        if user
-        else None
-    )
-    visible_document_ids = (
-        list(visible_documents.values_list("pk", flat=True))
-        if visible_documents is not None
-        else None
-    )
+    visible_document_ids = visible_document_ids_for_user(user)
     similar_docs = query_similar_documents(
         document=doc,
         document_ids=visible_document_ids,
diff --git a/src/paperless_ai/indexing.py b/src/paperless_ai/indexing.py
index 499990799..d8f4290e3 100644
--- a/src/paperless_ai/indexing.py
+++ b/src/paperless_ai/indexing.py
@@ -5,6 +5,7 @@ from datetime import timedelta
 from typing import TYPE_CHECKING
 
 from django.conf import settings
+from django.contrib.auth.models import User
 from django.utils import timezone
 from filelock import FileLock
 from filelock import ReadWriteLock
@@ -12,6 +13,7 @@ from filelock import Timeout
 
 from documents.models import Document
 from documents.models import PaperlessTask
+from documents.permissions import get_objects_for_user_owner_aware
 from documents.utils import IterWrapper
 from documents.utils import identity
 from paperless.config import AIConfig
@@ -450,6 +452,23 @@ def normalize_document_ids(document_ids: Iterable[int | str] | None) -> set[str]
     return {str(document_id) for document_id in document_ids}
 
 
+def visible_document_ids_for_user(user: User | None) -> list[int] | None:
+    """Return the pks of documents ``user`` may view, or ``None`` for no filter.
+
+    Returns ``None`` when ``user`` is ``None`` so retrieval runs unfiltered. Used
+    by both the similarity-context and taxonomy-hints paths to scope RAG
+    neighbours to documents the requesting user is allowed to see.
+    """
+    if user is None:
+        return None
+    visible_documents = get_objects_for_user_owner_aware(
+        user,
+        "view_document",
+        Document,
+    )
+    return list(visible_documents.values_list("pk", flat=True))
+
+
 def retrieve_similar_nodes(
     document: Document,
     document_ids: Iterable[int | str] | None = None,
diff --git a/src/paperless_ai/taxonomy.py b/src/paperless_ai/taxonomy.py
index 6b9cb77d9..4a5487d5b 100644
--- a/src/paperless_ai/taxonomy.py
+++ b/src/paperless_ai/taxonomy.py
@@ -4,9 +4,9 @@ from typing import TypedDict
 from django.contrib.auth.models import User
 
 from documents.models import Document
-from documents.permissions import get_objects_for_user_owner_aware
 from paperless.config import AIConfig
 from paperless_ai.indexing import retrieve_similar_nodes
+from paperless_ai.indexing import visible_document_ids_for_user
 
 if TYPE_CHECKING:
     from llama_index.core.schema import NodeWithScore
@@ -108,23 +108,8 @@ def get_taxonomy_hints_for_document(
     if not AIConfig().llm_embedding_backend:
         return None
 
-    visible_documents = (
-        get_objects_for_user_owner_aware(
-            user,
-            "view_document",
-            Document,
-        )
-        if user
-        else None
-    )
-    visible_document_ids = (
-        list(visible_documents.values_list("pk", flat=True))
-        if visible_documents is not None
-        else None
-    )
-
     nodes = retrieve_similar_nodes(
         document=document,
-        document_ids=visible_document_ids,
+        document_ids=visible_document_ids_for_user(user),
     )
     return build_taxonomy_hints_from_nodes(nodes)
diff --git a/src/paperless_ai/tests/test_taxonomy.py b/src/paperless_ai/tests/test_taxonomy.py
index 3249dac84..401933a91 100644
--- a/src/paperless_ai/tests/test_taxonomy.py
+++ b/src/paperless_ai/tests/test_taxonomy.py
@@ -157,11 +157,9 @@ class TestGetTaxonomyHintsForDocument:
             "paperless_ai.taxonomy.AIConfig",
             return_value=SimpleNamespace(llm_embedding_backend="huggingface"),
         )
-        visible = mocker.MagicMock()
-        visible.values_list.return_value = [1, 2, 3]
         mocker.patch(
-            "paperless_ai.taxonomy.get_objects_for_user_owner_aware",
-            return_value=visible,
+            "paperless_ai.taxonomy.visible_document_ids_for_user",
+            return_value=[1, 2, 3],
         )
         retrieve = mocker.patch(
             "paperless_ai.taxonomy.retrieve_similar_nodes",