diff --git a/anki-qt/aqt/importing.py b/anki-qt/aqt/importing.py
index 756b0db91..046176d18 100644
--- a/anki-qt/aqt/importing.py
+++ b/anki-qt/aqt/importing.py
@@ -179,6 +179,9 @@ you can enter it here. Use \\t to represent tab."""
         self.mw.pm.profile["importMode"] = self.importer.importMode
         self.importer.allowHTML = self.frm.allowHTML.isChecked()
         self.mw.pm.profile["allowHTML"] = self.importer.allowHTML
+        if self.frm.tagModifiedCheck.isChecked():
+            self.importer.tagModified = self.frm.tagModifiedTag.toPlainText()
+        self.mw.pm.profile["tagModified"] = self.importer.tagModified
         did = self.deck.selectedId()
         if did != self.importer.model["did"]:
             self.importer.model["did"] = did
diff --git a/anki-qt/designer/importing.ui b/anki-qt/designer/importing.ui
index ce14706bc..07dd178be 100644
--- a/anki-qt/designer/importing.ui
+++ b/anki-qt/designer/importing.ui
@@ -77,6 +77,20 @@
         </property>
        </widget>
       </item>
+      <item>
+       <layout class="QHBoxLayout" name="tagModifiedLayout">
+        <item>
+         <widget class="QCheckBox" name="tagModifiedCheck">
+          <property name="text">
+           <string>Tag modified notes:</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLineEdit" name="tagModifiedTag"/>
+        </item>
+       </layout>
+      </item>
      </layout>
     </widget>
    </item>
diff --git a/lib-python/anki/importing/noteimp.py b/lib-python/anki/importing/noteimp.py
index 8b190a61b..e4b95dde0 100644
--- a/lib-python/anki/importing/noteimp.py
+++ b/lib-python/anki/importing/noteimp.py
@@ -64,11 +64,13 @@ class NoteImporter(Importer):
     allowHTML = False
     importMode = 0
     mapping: Optional[List[str]]
+    tagModified: Optional[str]
 
     def __init__(self, col: _Collection, file: str) -> None:
         Importer.__init__(self, col, file)
         self.model = col.models.current()
         self.mapping = None
+        self.tagModified = None
         self._tagsMapped = False
 
     def run(self) -> None:
@@ -271,6 +273,13 @@ content in the text file to the correct fields."""
             self.col.tags.register(n.tags)
             tags = self.col.tags.join(n.tags)
             return [intTime(), self.col.usn(), n.fieldsStr, tags, id, n.fieldsStr, tags]
+        elif self.tagModified:
+            tags = self.col.db.scalar("select tags from notes where id = ?", id)
+            tagList = self.col.tags.split(tags) + self.tagModified.split(",")
+            tagList = self.col.tags.canonify(tagList)
+            self.col.tags.register(tagList)
+            tags = self.col.tags.join(tagList)
+            return [intTime(), self.col.usn(), n.fieldsStr, tags, id, n.fieldsStr]
         else:
             return [intTime(), self.col.usn(), n.fieldsStr, id, n.fieldsStr]
 
@@ -283,6 +292,13 @@ update notes set mod = ?, usn = ?, flds = ?, tags = ?
 where id = ? and (flds != ? or tags != ?)""",
                 rows,
             )
+        elif self.tagModified:
+            self.col.db.executemany(
+                """
+update notes set mod = ?, usn = ?, flds = ?, tags = ?
+where id = ? and flds != ?""",
+                rows,
+            )
         else:
             self.col.db.executemany(
                 """
diff --git a/lib-python/tests/test_importing.py b/lib-python/tests/test_importing.py
index 78c1edb2e..9cafe817d 100644
--- a/lib-python/tests/test_importing.py
+++ b/lib-python/tests/test_importing.py
@@ -1,6 +1,7 @@
 # coding: utf-8
 
 import os
+from tempfile import NamedTemporaryFile
 
 from anki.importing import (
     Anki2Importer,
@@ -194,6 +195,100 @@ def test_csv2():
     deck.close()
 
 
+def test_tsv_tag_modified():
+    deck = getEmptyCol()
+    mm = deck.models
+    m = mm.current()
+    f = mm.newField("Top")
+    mm.addField(m, f)
+    mm.save(m)
+    n = deck.newNote()
+    n["Front"] = "1"
+    n["Back"] = "2"
+    n["Top"] = "3"
+    n.addTag("four")
+    deck.addNote(n)
+
+    with NamedTemporaryFile(mode="w") as tf:
+        tf.write("1\tb\tc\n")
+        tf.flush()
+        i = TextImporter(deck, tf.name)
+        i.initMapping()
+        i.tagModified = "boom"
+        i.run()
+
+    n.load()
+    assert n["Front"] == "1"
+    assert n["Back"] == "b"
+    assert n["Top"] == "c"
+    assert "four" in n.tags
+    assert "boom" in n.tags
+    assert len(n.tags) == 2
+    assert i.updateCount == 1
+
+    deck.close()
+
+
+def test_tsv_tag_multiple_tags():
+    deck = getEmptyCol()
+    mm = deck.models
+    m = mm.current()
+    f = mm.newField("Top")
+    mm.addField(m, f)
+    mm.save(m)
+    n = deck.newNote()
+    n["Front"] = "1"
+    n["Back"] = "2"
+    n["Top"] = "3"
+    n.addTag("four")
+    n.addTag("five")
+    deck.addNote(n)
+
+    with NamedTemporaryFile(mode="w") as tf:
+        tf.write("1\tb\tc\n")
+        tf.flush()
+        i = TextImporter(deck, tf.name)
+        i.initMapping()
+        i.tagModified = "five,six"
+        i.run()
+
+    n.load()
+    assert n["Front"] == "1"
+    assert n["Back"] == "b"
+    assert n["Top"] == "c"
+    assert list(sorted(n.tags)) == list(sorted(["four", "five", "six"]))
+
+    deck.close()
+
+
+def test_csv_tag_only_if_modified():
+    deck = getEmptyCol()
+    mm = deck.models
+    m = mm.current()
+    f = mm.newField("Left")
+    mm.addField(m, f)
+    mm.save(m)
+    n = deck.newNote()
+    n["Front"] = "1"
+    n["Back"] = "2"
+    n["Left"] = "3"
+    deck.addNote(n)
+
+    with NamedTemporaryFile(mode="w") as tf:
+        tf.write("1,2,3\n")
+        tf.flush()
+        i = TextImporter(deck, tf.name)
+        i.initMapping()
+        i.tagModified = "right"
+        i.run()
+
+    n.load()
+    assert n.tags == []
+    assert i.updateCount == 0
+
+    deck.close()
+
+
 def test_supermemo_xml_01_unicode():
     deck = getEmptyCol()
     file = str(os.path.join(testDir, "support/supermemo1.xml"))