diff --git a/saharaclient/api/base.py b/saharaclient/api/base.py
index ab534cb1..a4fc78ba 100644
--- a/saharaclient/api/base.py
+++ b/saharaclient/api/base.py
@@ -139,6 +139,24 @@ class ResourceManager(object):
 
         return self.resource_class(self, data)
 
+    def _post(self, url, data, response_key=None, dump_json=True):
+        if dump_json:
+            kwargs = {'json': data}
+        else:
+            kwargs = {'data': data}
+
+        resp = self.api.post(url, **kwargs)
+
+        if resp.status_code != 202:
+            self._raise_api_exception(resp)
+
+        if response_key is not None:
+            data = get_json(resp)[response_key]
+        else:
+            data = get_json(resp)
+
+        return self.resource_class(self, data)
+
     def _list(self, url, response_key):
         resp = self.api.get(url)
         if resp.status_code == 200:
diff --git a/saharaclient/api/images.py b/saharaclient/api/images.py
index 217309db..66a89ca3 100644
--- a/saharaclient/api/images.py
+++ b/saharaclient/api/images.py
@@ -38,9 +38,7 @@ class ImageManager(base.ResourceManager):
         body = {"username": user_name,
                 "description": desc}
 
-        resp = self.api.post('/images/%s' % image_id, json=body)
-        if resp.status_code != 202:
-            raise RuntimeError('Failed to register image %s' % image_id)
+        return self._post('/images/%s' % image_id, body)
 
     def update_tags(self, image_id, new_tags):
         old_image = self.get(image_id)
@@ -52,16 +50,11 @@ class ImageManager(base.ResourceManager):
         to_remove = list(old_tags - new_tags)
 
         if len(to_add) != 0:
-            resp = self.api.post('/images/%s/tag' % image_id,
-                                 json={'tags': to_add})
-
-            if resp.status_code != 202:
-                raise RuntimeError('Failed to add tags to image %s' % image_id)
+            return self._post('/images/%s/tag' % image_id,
+                              {'tags': to_add}, 'image')
 
         if len(to_remove) != 0:
-            resp = self.api.post('/images/%s/untag' % image_id,
-                                 json={'tags': to_remove})
+            return self._post('/images/%s/untag' % image_id,
+                              {'tags': to_remove}, 'image')
 
-            if resp.status_code != 202:
-                raise RuntimeError('Failed to remove tags from image %s' %
-                                   image_id)
+        return self._get('/images/%s' % image_id, 'image')
diff --git a/saharaclient/tests/unit/test_images.py b/saharaclient/tests/unit/test_images.py
index fbc9ba56..b158fedd 100644
--- a/saharaclient/tests/unit/test_images.py
+++ b/saharaclient/tests/unit/test_images.py
@@ -69,16 +69,22 @@ class ImageTest(base.BaseTestCase):
         tag_url = self.URL + '/images/id/tag'
         untag_url = self.URL + '/images/id/untag'
 
-        self.responses.post(tag_url, status_code=202)
-        self.responses.post(untag_url, status_code=202)
+        self.responses.post(tag_url, json={'image': self.body},
+                            status_code=202)
+        self.responses.post(untag_url, json={'image': self.body},
+                            status_code=202)
 
         image = mock.Mock()
         mget.return_value = image
 
         image.tags = []
-        self.client.images.update_tags('id', ['username', 'tag'])
+        resp = self.client.images.update_tags('id', ['username', 'tag'])
         self.assertEqual(tag_url, self.responses.last_request.url)
+        self.assertIsInstance(resp, images.Image)
+        self.assertFields(self.body, resp)
 
         image.tags = ['username', 'tag']
-        self.client.images.update_tags('id', ['username'])
+        resp = self.client.images.update_tags('id', ['username'])
         self.assertEqual(untag_url, self.responses.last_request.url)
+        self.assertIsInstance(resp, images.Image)
+        self.assertFields(self.body, resp)