diff --git a/org_rw/org_rw.py b/org_rw/org_rw.py
index 99ac122..52257f9 100644
--- a/org_rw/org_rw.py
+++ b/org_rw/org_rw.py
@@ -753,10 +753,7 @@ class Headline:
 
     @property
     def tags(self):
-        if isinstance(self.parent, OrgDoc):
-            return list(self.shallow_tags)
-        else:
-            return list(self.shallow_tags) + self.parent.tags
+        return list(self.shallow_tags) + self.parent.tags
 
     def add_tag(self, tag: str):
         self.shallow_tags.append(tag)
@@ -2280,6 +2277,17 @@ class OrgDoc:
     def path(self):
         return self._path
 
+    @property
+    def tags(self) -> list[str]:
+        for kw in self.keywords:
+            if kw.key == "FILETAGS":
+                return kw.value.strip(':').split(':')
+        return []
+
+    @property
+    def shallow_tags(self) -> list[str]:
+        return self.tags
+
     ## Querying
     def get_links(self):
         for headline in self.headlines:
diff --git a/tests/test_org.py b/tests/test_org.py
index c17f9d2..d515168 100644
--- a/tests/test_org.py
+++ b/tests/test_org.py
@@ -889,6 +889,23 @@ class TestSerde(unittest.TestCase):
         h1_2_h2 = h1_2.children[0]
         self.assertEqual(sorted(h1_2_h2.tags), ['filetag', 'otherh1tag', 'otherh2tag'])
 
+    def test_shallow_tag_property_read_13(self):
+        with open(os.path.join(DIR, "13-tags.org")) as f:
+            orig = f.read()
+            doc = loads(orig)
+
+        self.assertEqual(doc.shallow_tags, ['filetag'])
+
+        h1_1, h1_2 = doc.getTopHeadlines()
+        self.assertEqual(sorted(h1_1.shallow_tags), ['h1tag'])
+        self.assertEqual(sorted(h1_2.shallow_tags), ['otherh1tag'])
+
+        h1_1_h2 = h1_1.children[0]
+        self.assertEqual(sorted(h1_1_h2.shallow_tags), ['h2tag'])
+
+        h1_2_h2 = h1_2.children[0]
+        self.assertEqual(sorted(h1_2_h2.shallow_tags), ['otherh2tag'])
+
 def print_tree(tree, indentation=0, headline=None):
     for element in tree:
         print(" " * indentation * 2, "EL:", element)