diff --git a/packaging/tags.py b/packaging/tags.py
index a0e1ea23..2c4fb390 100644
--- a/packaging/tags.py
+++ b/packaging/tags.py
@@ -480,6 +480,15 @@ def interpreter_version(*, warn: bool = False) -> str:
     return version
 
 
+def interpreter_tag(*, warn: bool = False) -> Optional[str]:
+    interp_name = interpreter_name()
+    if interp_name == "pp":
+        return "pp3"
+    elif interp_name == "cp":
+        return "cp" + interpreter_version(warn=warn)
+    return None
+
+
 def _version_nodot(version: PythonVersion) -> str:
     return "".join(map(str, version))
 
@@ -498,10 +507,4 @@ def sys_tags(*, warn: bool = False) -> Iterator[Tag]:
     else:
         yield from generic_tags()
 
-    if interp_name == "pp":
-        interp = "pp3"
-    elif interp_name == "cp":
-        interp = "cp" + interpreter_version(warn=warn)
-    else:
-        interp = None
-    yield from compatible_tags(interpreter=interp)
+    yield from compatible_tags(interpreter=interpreter_tag(warn=warn))
diff --git a/tests/test_tags.py b/tests/test_tags.py
index 39515e8d..84acfc61 100644
--- a/tests/test_tags.py
+++ b/tests/test_tags.py
@@ -166,6 +166,21 @@ def test_sys_version_info(self, version_info, version_str, monkeypatch):
         assert tags.interpreter_version() == version_str
 
 
+class TestInterpreterTag:
+    def test_interpreter_tag_cpython(self, monkeypatch):
+        monkeypatch.setattr(tags, "interpreter_name", lambda: "cp")
+        monkeypatch.setattr(tags, "interpreter_version", lambda **kwargs: "311")
+        assert tags.interpreter_tag() == "cp311"
+
+    def test_interpreter_tag_pypy(self, monkeypatch):
+        monkeypatch.setattr(tags, "interpreter_name", lambda: "pp")
+        assert tags.interpreter_tag() == "pp3"
+
+    def test_interpreter_tag_unknown(self, monkeypatch):
+        monkeypatch.setattr(tags, "interpreter_name", lambda: "unknown")
+        assert tags.interpreter_tag() is None
+
+
 class TestMacOSPlatforms:
     @pytest.mark.parametrize(
         "arch, is_32bit, expected",