diff --git a/core/modules/forum/forum.module b/core/modules/forum/forum.module
index 7cc950f..d549abc 100644
--- a/core/modules/forum/forum.module
+++ b/core/modules/forum/forum.module
@@ -300,11 +300,11 @@ function forum_node_validate(EntityInterface $node, $form) {
       foreach ($node->taxonomy_forums[$langcode] as $delta => $item) {
         // If no term was selected (e.g. when no terms exist yet), remove the
         // item.
-        if (empty($item['tid'])) {
+        if (empty($item['target_id'])) {
           unset($node->taxonomy_forums[$langcode][$delta]);
           continue;
         }
-        $term = taxonomy_term_load($item['tid']);
+        $term = taxonomy_term_load($item['target_id']);
         if (!$term) {
           form_set_error('taxonomy_forums', t('Select a forum.'));
           continue;
@@ -333,13 +333,13 @@ function forum_node_presave(EntityInterface $node) {
     reset($node->taxonomy_forums);
     $langcode = key($node->taxonomy_forums);
     if (!empty($node->taxonomy_forums[$langcode])) {
-      $node->forum_tid = $node->taxonomy_forums[$langcode][0]['tid'];
+      $node->forum_tid = $node->taxonomy_forums[$langcode][0]['target_id'];
       // Only do a shadow copy check if this is not a new node.
       if (!$node->isNew()) {
         $old_tid = db_query_range("SELECT f.tid FROM {forum} f INNER JOIN {node} n ON f.vid = n.vid WHERE n.nid = :nid ORDER BY f.vid DESC", 0, 1, array(':nid' => $node->nid))->fetchField();
         if ($old_tid && isset($node->forum_tid) && ($node->forum_tid != $old_tid) && !empty($node->shadow)) {
           // A shadow copy needs to be created. Retain new term and add old term.
-          $node->taxonomy_forums[$langcode][] = array('tid' => $old_tid);
+          $node->taxonomy_forums[$langcode][] = array('target_id' => $old_tid);
         }
       }
     }
@@ -538,7 +538,7 @@ function forum_field_storage_pre_insert(EntityInterface $entity, &$skip_fields)
       $query->values(array(
         'nid' => $entity->id(),
         'title' => $translation->title->value,
-        'tid' => $translation->taxonomy_forums->tid,
+        'tid' => $translation->taxonomy_forums->target_id,
         'sticky' => $entity->sticky,
         'created' => $entity->created,
         'comment_count' => 0,
@@ -573,7 +573,7 @@ function forum_field_storage_pre_update(EntityInterface $entity, &$skip_fields)
           $query->values(array(
             'nid' => $entity->nid,
             'title' => $entity->title,
-            'tid' => $item['tid'],
+            'tid' => $item['target_id'],
             'sticky' => $entity->sticky,
             'created' => $entity->created,
             'comment_count' => 0,
diff --git a/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php b/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php
index f8c0479..c28b1dc 100644
--- a/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php
+++ b/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php
@@ -529,7 +529,7 @@ function createForumTopic($forum, $container = FALSE) {
     // Retrieve node object, ensure that the topic was created and in the proper forum.
     $node = $this->drupalGetNodeByTitle($title);
     $this->assertTrue($node != NULL, format_string('Node @title was loaded', array('@title' => $title)));
-    $this->assertEqual($node->taxonomy_forums[Language::LANGCODE_NOT_SPECIFIED][0]['tid'], $tid, 'Saved forum topic was in the expected forum');
+    $this->assertEqual($node->taxonomy_forums[Language::LANGCODE_NOT_SPECIFIED][0]['target_id'], $tid, 'Saved forum topic was in the expected forum');
 
     // View forum topic.
     $this->drupalGet('node/' . $node->nid);
diff --git a/core/modules/node/lib/Drupal/node/Tests/NodeAccessPagerTest.php b/core/modules/node/lib/Drupal/node/Tests/NodeAccessPagerTest.php
index 9d022c5..6063677 100644
--- a/core/modules/node/lib/Drupal/node/Tests/NodeAccessPagerTest.php
+++ b/core/modules/node/lib/Drupal/node/Tests/NodeAccessPagerTest.php
@@ -87,7 +87,7 @@ public function testForumPager() {
         'nid' => NULL,
         'type' => 'forum',
         'taxonomy_forums' => array(
-          array('tid' => $tid)
+          array('target_id' => $tid),
         ),
       ));
     }
diff --git a/core/modules/system/lib/Drupal/system/Tests/Entity/EntityQueryRelationshipTest.php b/core/modules/system/lib/Drupal/system/Tests/Entity/EntityQueryRelationshipTest.php
index f36fca7..66fc524 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Entity/EntityQueryRelationshipTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Entity/EntityQueryRelationshipTest.php
@@ -111,7 +111,7 @@ public function setUp() {
       $entity->name->value = $this->randomName();
       $index = $i ? 1 : 0;
       $entity->user_id->target_id = $this->accounts[$index]->uid;
-      $entity->{$this->fieldName}->tid = $this->terms[$index]->id();
+      $entity->{$this->fieldName}->target_id = $this->terms[$index]->id();
       $entity->save();
       $this->entities[] = $entity;
     }
@@ -153,7 +153,7 @@ public function testQuery() {
     // This returns the 0th entity as that's only one pointing to the 0th
     // term (test with specifying the column name).
     $this->queryResults = $this->factory->get('entity_test')
-      ->condition("$this->fieldName.tid.entity.name", $this->terms[0]->name->value)
+      ->condition("$this->fieldName.target_id.entity.name", $this->terms[0]->name->value)
       ->execute();
     $this->assertResults(array(0));
     // This returns the 1st and 2nd entity as those point to the 1st term.
diff --git a/core/modules/system/lib/Drupal/system/Tests/Theme/EntityFilteringThemeTest.php b/core/modules/system/lib/Drupal/system/Tests/Theme/EntityFilteringThemeTest.php
index 5ad7a44..ba4bca5 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Theme/EntityFilteringThemeTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Theme/EntityFilteringThemeTest.php
@@ -102,7 +102,7 @@ function setUp() {
       'title' => $this->xss_label,
       'type' => 'article',
       'promote' => NODE_PROMOTED,
-      'field_tags' => array(array('tid' => $this->term->id())),
+      'field_tags' => array(array('target_id' => $this->term->id())),
     ));
 
     // Create a test comment on the test node.
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/LinkFormatter.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/LinkFormatter.php
index 63dbc0f..b44002e 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/LinkFormatter.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/LinkFormatter.php
@@ -33,9 +33,10 @@ class LinkFormatter extends TaxonomyFormatterBase {
   public function viewElements(EntityInterface $entity, $langcode, array $items) {
     $elements = array();
 
-    // Terms without tid do not exist yet, theme such terms as just their name.
+    // Terms without target_id do not exist yet, theme such terms as just their
+    // name.
     foreach ($items as $delta => $item) {
-      if (!$item['tid']) {
+      if (!$item['target_id']) {
         $elements[$delta] = array(
           '#markup' => check_plain($item['entity']->label()),
         );
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/RSSCategoryFormatter.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/RSSCategoryFormatter.php
index e1cd48d..2a2af05 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/RSSCategoryFormatter.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/RSSCategoryFormatter.php
@@ -31,10 +31,10 @@ class RSSCategoryFormatter extends TaxonomyFormatterBase {
    * {@inheritdoc}
    */
   public function viewElements(EntityInterface $entity, $langcode, array $items) {
-    // Terms whose tid is 'autocreate' do not exist yet and $item['entity'] is
-    // not set. Theme such terms as just their name.
+    // Terms whose target_id is 'autocreate' do not exist yet and
+    // $item['entity'] is not set. Theme such terms as just their name.
     foreach ($items as $item) {
-      if ($item['tid']) {
+      if ($item['target_id']) {
         $value = $item['entity']->label();
 
         $uri = $item['entity']->uri();
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/TaxonomyFormatterBase.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/TaxonomyFormatterBase.php
index 6f688da..90f76ad 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/TaxonomyFormatterBase.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/formatter/TaxonomyFormatterBase.php
@@ -30,8 +30,8 @@ public function prepareView(array $entities, $langcode, array &$items) {
     foreach ($entities as $id => $entity) {
       foreach ($items[$id] as $delta => $item) {
         // Force the array key to prevent duplicates.
-        if ($item['tid'] !== 0) {
-          $tids[$item['tid']] = $item['tid'];
+        if ($item['target_id'] !== 0) {
+          $tids[$item['target_id']] = $item['target_id'];
         }
       }
     }
@@ -46,12 +46,12 @@ public function prepareView(array $entities, $langcode, array &$items) {
         foreach ($items[$id] as $delta => $item) {
           // Check whether the taxonomy term field instance value could be
           // loaded.
-          if (isset($terms[$item['tid']])) {
+          if (isset($terms[$item['target_id']])) {
             // Replace the instance value with the term data.
-            $items[$id][$delta]['entity'] = $terms[$item['tid']];
+            $items[$id][$delta]['entity'] = $terms[$item['target_id']];
           }
           // Terms to be created are not in $terms, but are still legitimate.
-          elseif ($item['tid'] === 0 && isset($item['entity'])) {
+          elseif ($item['target_id'] === 0 && isset($item['entity'])) {
             // Leave the item in place.
           }
           // Otherwise, unset the instance value, since the term does not exist.
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php
index c0ef1f6..78f8fb3 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php
@@ -50,7 +50,7 @@ public function settingsForm(array $form, array &$form_state) {
   public function formElement(array $items, $delta, array $element, $langcode, array &$form, array &$form_state) {
     $tags = array();
     foreach ($items as $item) {
-      $tags[$item['tid']] = isset($item['taxonomy_term']) ? $item['taxonomy_term'] : taxonomy_term_load($item['tid']);
+      $tags[$item['target_id']] = isset($item['taxonomy_term']) ? $item['taxonomy_term'] : taxonomy_term_load($item['target_id']);
     }
     $element += array(
       '#type' => 'textfield',
@@ -86,7 +86,7 @@ public function massageFormValues(array $values, array $form, array &$form_state
       // otherwise, create a new term.
       if ($possibilities = entity_load_multiple_by_properties('taxonomy_term', array('name' => trim($value), 'vid' => array_keys($vocabularies)))) {
         $term = array_pop($possibilities);
-        $item = array('tid' => $term->id());
+        $item = array('target_id' => $term->id());
       }
       else {
         $vocabulary = reset($vocabularies);
@@ -94,7 +94,7 @@ public function massageFormValues(array $values, array $form, array &$form_state
           'vid' => $vocabulary->id(),
           'name' => $value,
         ));
-        $item = array('tid' => 0, 'entity' => $term);
+        $item = array('target_id' => 0, 'entity' => $term);
       }
       $items[] = $item;
     }
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TaxonomyTermReferenceItemTest.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TaxonomyTermReferenceItemTest.php
index a8aefcb..e9180d6 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TaxonomyTermReferenceItemTest.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TaxonomyTermReferenceItemTest.php
@@ -78,14 +78,14 @@ public function testTaxonomyTermReferenceItem() {
     $tid = $this->term->id();
     // Just being able to create the entity like this verifies a lot of code.
     $entity = entity_create('entity_test', array());
-    $entity->field_test_taxonomy->tid = $this->term->id();
+    $entity->field_test_taxonomy->target_id = $this->term->id();
     $entity->name->value = $this->randomName();
     $entity->save();
 
     $entity = entity_load('entity_test', $entity->id());
     $this->assertTrue($entity->field_test_taxonomy instanceof FieldInterface, 'Field implements interface.');
     $this->assertTrue($entity->field_test_taxonomy[0] instanceof FieldItemInterface, 'Field item implements interface.');
-    $this->assertEqual($entity->field_test_taxonomy->tid, $this->term->id());
+    $this->assertEqual($entity->field_test_taxonomy->target_id, $this->term->id());
     $this->assertEqual($entity->field_test_taxonomy->entity->name->value, $this->term->name->value);
     $this->assertEqual($entity->field_test_taxonomy->entity->id(), $tid);
     $this->assertEqual($entity->field_test_taxonomy->entity->uuid(), $this->term->uuid());
@@ -106,7 +106,7 @@ public function testTaxonomyTermReferenceItem() {
     ));
     $term2->save();
 
-    $entity->field_test_taxonomy->tid = $term2->id();
+    $entity->field_test_taxonomy->target_id = $term2->id();
     $this->assertEqual($entity->field_test_taxonomy->entity->id(), $term2->id());
     $this->assertEqual($entity->field_test_taxonomy->entity->name->value, $term2->name->value);
   }
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermFieldTest.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermFieldTest.php
index 53a53b1..458cf9e 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermFieldTest.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermFieldTest.php
@@ -85,7 +85,7 @@ function testTaxonomyTermFieldValidation() {
     $langcode = Language::LANGCODE_NOT_SPECIFIED;
     $entity = entity_create('entity_test', array());
     $term = $this->createTerm($this->vocabulary);
-    $entity->{$this->field_name}->tid = $term->id();
+    $entity->{$this->field_name}->target_id = $term->id();
     try {
       field_attach_validate($entity);
       $this->pass('Correct term does not cause validation error.');
@@ -96,7 +96,7 @@ function testTaxonomyTermFieldValidation() {
 
     $entity = entity_create('entity_test', array());
     $bad_term = $this->createTerm($this->createVocabulary());
-    $entity->{$this->field_name}->tid = $bad_term->id();
+    $entity->{$this->field_name}->target_id = $bad_term->id();
     try {
       field_attach_validate($entity);
       $this->fail('Wrong term causes validation error.');
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermIndexTest.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermIndexTest.php
index d6280c8..5ef5a97 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermIndexTest.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermIndexTest.php
@@ -175,7 +175,7 @@ function testTaxonomyIndex() {
     $this->assertEqual(1, $index_count, 'Term 2 is indexed once.');
 
     // Update the article to change one term.
-    $node->{$this->field_name_1}[$langcode] = array(array('tid' => $term_1->id()));
+    $node->{$this->field_name_1}[$langcode] = array(array('target_id' => $term_1->id()));
     $node->save();
 
     // Check that both terms are indexed.
@@ -191,7 +191,7 @@ function testTaxonomyIndex() {
     $this->assertEqual(1, $index_count, 'Term 2 is indexed.');
 
     // Update the article to change another term.
-    $node->{$this->field_name_2}[$langcode] = array(array('tid' => $term_1->id()));
+    $node->{$this->field_name_2}[$langcode] = array(array('target_id' => $term_1->id()));
     $node->save();
 
     // Check that only one term is indexed.
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/Views/TaxonomyTestBase.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/Views/TaxonomyTestBase.php
index 74c546b..f8f315b 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/Views/TaxonomyTestBase.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/Views/TaxonomyTestBase.php
@@ -55,8 +55,8 @@ function setUp() {
 
     $node = array();
     $node['type'] = 'article';
-    $node['field_views_testing_tags'][]['tid'] = $this->term1->id();
-    $node['field_views_testing_tags'][]['tid'] = $this->term2->id();
+    $node['field_views_testing_tags'][]['target_id'] = $this->term1->id();
+    $node['field_views_testing_tags'][]['target_id'] = $this->term2->id();
     $this->nodes[] = $this->drupalCreateNode($node);
     $this->nodes[] = $this->drupalCreateNode($node);
   }
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Type/TaxonomyTermReferenceItem.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Type/TaxonomyTermReferenceItem.php
index b558d97..6b9a763 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Type/TaxonomyTermReferenceItem.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Type/TaxonomyTermReferenceItem.php
@@ -9,11 +9,12 @@
 
 use Drupal\Core\Entity\Field\FieldItemBase;
 use Drupal\Core\TypedData\TypedDataInterface;
+use Drupal\Core\Entity\Field\Type\EntityReferenceItem;
 
 /**
  * Defines the 'taxonomy_term_reference' entity field item.
  */
-class TaxonomyTermReferenceItem extends FieldItemBase {
+class TaxonomyTermReferenceItem extends EntityReferenceItem {
 
   /**
    * Property definitions of the contained properties.
@@ -28,40 +29,7 @@ class TaxonomyTermReferenceItem extends FieldItemBase {
    * Implements \Drupal\Core\TypedData\ComplexDataInterface::getPropertyDefinitions().
    */
   public function getPropertyDefinitions() {
-    if (!isset(static::$propertyDefinitions)) {
-      static::$propertyDefinitions['tid'] = array(
-        'type' => 'integer',
-        'label' => t('Referenced taxonomy term id.'),
-      );
-      static::$propertyDefinitions['entity'] = array(
-        'type' => 'entity',
-        'constraints' => array(
-          'EntityType' => 'taxonomy_term',
-        ),
-        'label' => t('Term'),
-        'description' => t('The referenced taxonomy term'),
-        // The entity object is computed out of the tid.
-        'computed' => TRUE,
-        'read-only' => FALSE,
-        'settings' => array('id source' => 'tid'),
-      );
-    }
-    return static::$propertyDefinitions;
-  }
-
-  /**
-   * Overrides \Drupal\Core\Entity\Field\FieldItemBase::get().
-   */
-  public function setValue($values, $notify = TRUE) {
-    // Treat the values as property value of the entity property, if no array is
-    // given.
-    if (isset($values) && !is_array($values)) {
-      $values = array('entity' => $values);
-    }
-    // Make sure that the 'entity' property gets set as 'tid'.
-    if (isset($values['tid']) && !isset($values['entity'])) {
-      $values['entity'] = $values['tid'];
-    }
-    parent::setValue($values, $notify);
+    $this->definition['settings']['target_type'] = 'taxonomy_term';
+    return parent::getPropertyDefinitions();
   }
 }
diff --git a/core/modules/taxonomy/taxonomy.install b/core/modules/taxonomy/taxonomy.install
index d89b89c..f579755 100644
--- a/core/modules/taxonomy/taxonomy.install
+++ b/core/modules/taxonomy/taxonomy.install
@@ -6,6 +6,7 @@
  */
 
 use Drupal\Component\Uuid\Uuid;
+use Drupal\field\Plugin\Core\Entity\Field;
 
 /**
  * Implements hook_uninstall().
@@ -175,25 +176,37 @@ function taxonomy_schema() {
 function taxonomy_field_schema($field) {
   return array(
     'columns' => array(
-      'tid' => array(
+      'target_id' => array(
         'type' => 'int',
         'unsigned' => TRUE,
         'not null' => FALSE,
       ),
     ),
     'indexes' => array(
-      'tid' => array('tid'),
+      'target_id' => array('target_id'),
     ),
     'foreign keys' => array(
-      'tid' => array(
+      'target_id' => array(
         'table' => 'taxonomy_term_data',
-        'columns' => array('tid' => 'tid'),
+        'columns' => array('target_id' => 'tid'),
       ),
     ),
   );
 }
 
 /**
+ * Implements hook_update_dependencies().
+ */
+function taxonomy_update_dependencies() {
+  // Convert the 'tid' column of the taxonomy reference field to 'target_id'
+  // after fields and instances have been moved to the config system.
+  $dependencies['taxonomy'][8007] = array(
+    'field' => 8003,
+  );
+  return $dependencies;
+}
+
+/**
  * Remove the {taxonomy_vocabulary}.module field.
  */
 function taxonomy_update_8000() {
@@ -335,3 +348,41 @@ function taxonomy_update_8006() {
       ->execute();
   }
 }
+
+/**
+ * Update taxonomy_term_reference field tables to use target_id instead of tid.
+ */
+function taxonomy_update_8007() {
+  foreach (config_get_storage_names_with_prefix('field.field.') as $config_name) {
+    $field_config = config($config_name);
+    // Only update taxonomy reference fields that use the default SQL storage.
+    if ($field_config->get('type') == 'taxonomy_term_reference' && $field_config->get('storage.type') == 'field_sql_storage') {
+      $field = new Field($field_config->get());
+
+      $tables = array(
+        _field_sql_storage_tablename($field),
+        _field_sql_storage_revision_tablename($field),
+      );
+
+      foreach ($tables as $table_name) {
+        db_change_field($table_name, $field->id() . '_tid', $field->id() . '_target_id', array(
+          'description' => 'The ID of the target entity.',
+          'type' => 'int',
+          'unsigned' => TRUE,
+          'not null' => FALSE,
+        ));
+
+        // Change the index.
+        db_drop_index($table_name, $field->id() . '_tid');
+        db_add_index($table_name, $field->id() . '_target_id', array($field->id() . '_target_id'));
+      }
+
+      // Update the indexes in field config as well.
+      $indexes = $field_config->get('indexes');
+      unset($indexes['tid']);
+      $indexes['target_id'] = array('target_id');
+      $field_config->set('indexes', $indexes);
+      $field_config->save();
+    }
+  }
+}
diff --git a/core/modules/taxonomy/taxonomy.module b/core/modules/taxonomy/taxonomy.module
index 980ad00..b2c6b83 100644
--- a/core/modules/taxonomy/taxonomy.module
+++ b/core/modules/taxonomy/taxonomy.module
@@ -948,8 +948,8 @@ function taxonomy_field_validate(EntityInterface $entity = NULL, $field, $instan
   // Build an array of existing term IDs so they can be loaded with
   // taxonomy_term_load_multiple();
   foreach ($items as $delta => $item) {
-    if (!empty($item['tid']) && $item['tid'] != 'autocreate') {
-      $tids[] = $item['tid'];
+    if (!empty($item['target_id']) && $item['target_id'] != 'autocreate') {
+      $tids[] = $item['target_id'];
     }
   }
   if (!empty($tids)) {
@@ -959,12 +959,12 @@ function taxonomy_field_validate(EntityInterface $entity = NULL, $field, $instan
     // allowed values for this field.
     foreach ($items as $delta => $item) {
       $validate = TRUE;
-      if (!empty($item['tid']) && $item['tid'] != 'autocreate') {
+      if (!empty($item['target_id']) && $item['target_id'] != 'autocreate') {
         $validate = FALSE;
         foreach ($field['settings']['allowed_values'] as $settings) {
           // If no parent is specified, check if the term is in the vocabulary.
           if (isset($settings['vocabulary']) && empty($settings['parent'])) {
-            if ($settings['vocabulary'] == $terms[$item['tid']]->bundle()) {
+            if ($settings['vocabulary'] == $terms[$item['target_id']]->bundle()) {
               $validate = TRUE;
               break;
             }
@@ -972,7 +972,7 @@ function taxonomy_field_validate(EntityInterface $entity = NULL, $field, $instan
           // If a parent is specified, then to validate it must appear in the
           // array returned by taxonomy_term_load_parents_all().
           elseif (!empty($settings['parent'])) {
-            $ancestors = taxonomy_term_load_parents_all($item['tid']);
+            $ancestors = taxonomy_term_load_parents_all($item['target_id']);
             foreach ($ancestors as $ancestor) {
               if ($ancestor->id() == $settings['parent']) {
                 $validate = TRUE;
@@ -996,7 +996,7 @@ function taxonomy_field_validate(EntityInterface $entity = NULL, $field, $instan
  * Implements hook_field_is_empty().
  */
 function taxonomy_field_is_empty($item, $field_type) {
-  return !is_array($item) || (empty($item['tid']) && empty($item['entity']));
+  return !is_array($item) || (empty($item['target_id']) && empty($item['entity']));
 }
 
 /**
@@ -1153,10 +1153,9 @@ function taxonomy_rdf_mapping() {
  */
 function taxonomy_field_presave(EntityInterface $entity, $field, $instance, $langcode, &$items) {
   foreach ($items as $delta => $item) {
-    if (!$item['tid'] && isset($item['entity'])) {
-      unset($item['tid']);
+    if (!$item['target_id'] && isset($item['target_id'])) {
       $item['entity']->save();
-      $items[$delta]['tid'] = $item['entity']->id();
+      $items[$delta]['target_id'] = $item['entity']->id();
     }
   }
 }
@@ -1216,7 +1215,7 @@ function taxonomy_build_node_index($node) {
         foreach (field_available_languages('node', $field) as $langcode) {
           if (!empty($items[$langcode])) {
             foreach ($items[$langcode] as $item) {
-              $tid_all[$item['tid']] = $item['tid'];
+              $tid_all[$item['target_id']] = $item['target_id'];
             }
           }
         }
diff --git a/core/modules/taxonomy/taxonomy.views.inc b/core/modules/taxonomy/taxonomy.views.inc
index d52819b..876c6c8 100644
--- a/core/modules/taxonomy/taxonomy.views.inc
+++ b/core/modules/taxonomy/taxonomy.views.inc
@@ -346,7 +346,7 @@ function taxonomy_field_views_data($field) {
     }
 
     // Add the relationship only on the tid field.
-    $data[$table_name][$field['field_name'] . '_tid']['relationship'] = array(
+    $data[$table_name][$field['field_name'] . '_target_id']['relationship'] = array(
       'id' => 'standard',
       'base' => 'taxonomy_term_data',
       'base field' => 'tid',
@@ -380,7 +380,7 @@ function taxonomy_field_views_data_views_data_alter(&$data, $field) {
       'id' => 'entity_reverse',
       'field_name' => $field['field_name'],
       'field table' => _field_sql_storage_tablename($field),
-      'field field' => $field['field_name'] . '_tid',
+      'field field' => $field['field_name'] . '_target_id',
       'base' => $entity_info['base_table'],
       'base field' => $entity_info['entity_keys']['id'],
       'label' => t('!field_name', array('!field_name' => $field['field_name'])),
diff --git a/core/modules/views/lib/Drupal/views/Tests/DefaultViewsTest.php b/core/modules/views/lib/Drupal/views/Tests/DefaultViewsTest.php
index 9cfdce9..9df7c23 100644
--- a/core/modules/views/lib/Drupal/views/Tests/DefaultViewsTest.php
+++ b/core/modules/views/lib/Drupal/views/Tests/DefaultViewsTest.php
@@ -89,7 +89,7 @@ protected function setUp() {
       $term = $this->createTerm($this->vocabulary);
 
       $values = array('created' => $time, 'type' => 'page');
-      $values[$this->field_name][]['tid'] = $term->id();
+      $values[$this->field_name][]['target_id'] = $term->id();
 
       // Make every other node promoted.
       if ($i % 2) {
diff --git a/core/profiles/standard/config/field.field.field_tags.yml b/core/profiles/standard/config/field.field.field_tags.yml
index eaa1971..e0f6952 100644
--- a/core/profiles/standard/config/field.field.field_tags.yml
+++ b/core/profiles/standard/config/field.field.field_tags.yml
@@ -17,7 +17,7 @@ cardinality: '-1'
 translatable: '0'
 entity_types: {  }
 indexes:
-  tid:
-    - tid
+  target_id:
+    - target_id
 status: 1
 langcode: und