diff --git a/releasenotes/notes/deprecate-and-enable-identity-project-tags-23b87518888e563a.yaml b/releasenotes/notes/deprecate-and-enable-identity-project-tags-23b87518888e563a.yaml
new file mode 100644
index 0000000..be2df6b
--- /dev/null
+++ b/releasenotes/notes/deprecate-and-enable-identity-project-tags-23b87518888e563a.yaml
@@ -0,0 +1,17 @@
+---
+upgrade:
+  - |
+    Project tags are supported by Keystone since Queens.
+    As Tempest currently supports only much newer OpenStack versions
+    (Ussuri or later), the configuration option which enables
+    project tags testing
+    (``CONF.identity-feature-enabled.project_tags``)
+    is now enabled by default.
+deprecations:
+  - |
+    Project tags are supported by Keystone since Queens.
+    As Tempest currently supports only much newer OpenStack versions
+    (Ussuri or later), the configuration option which enables
+    project tags testing
+    (``CONF.identity-feature-enabled.project_tags``)
+    is now deprecated.
diff --git a/tempest/config.py b/tempest/config.py
index fde52e4..662a249 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -259,8 +259,11 @@
                 help='Does the environment have the security compliance '
                      'settings enabled?'),
     cfg.BoolOpt('project_tags',
-                default=False,
-                help='Is the project tags identity v3 API available?'),
+                default=True,
+                help='Is the project tags identity v3 API available?',
+                deprecated_for_removal=True,
+                deprecated_reason='Project tags API is a default feature '
+                                  'since Queens'),
     cfg.BoolOpt('application_credentials',
                 default=True,
                 help='Does the environment have application credentials '