diff --git a/core/lib/Drupal/Core/Entity/ContentEntityBase.php b/core/lib/Drupal/Core/Entity/ContentEntityBase.php
index 2c62589fa2..d97608af01 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityBase.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityBase.php
@@ -351,6 +351,14 @@ public function getRevisionId() {
     return $this->getEntityKey('revision');
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function isDefaultRevisionType() {
+    $revision_type = $this->get('revision_type')->value;
+    return isset($revision_type) && intval($revision_type) === 1;
+  }
+
   /**
    * {@inheritdoc}
    */
diff --git a/core/lib/Drupal/Core/Entity/ContentEntityInterface.php b/core/lib/Drupal/Core/Entity/ContentEntityInterface.php
index d045152f6a..e5923150c3 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityInterface.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityInterface.php
@@ -71,4 +71,12 @@ public function getLoadedRevisionId();
    */
   public function updateLoadedRevisionId();
 
+  /**
+   * Checks whether the entity object was a default revision when it was saved.
+   *
+   * @return bool
+   *   TRUE if the entity object was a revision, FALSE otherwise.
+   */
+  public function isDefaultRevisionType();
+
 }
diff --git a/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php b/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php
index 874a3416bc..cd0f380cfd 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php
@@ -288,6 +288,9 @@ protected function doSave($id, EntityInterface $entity) {
     }
 
     $this->populateAffectedRevisionTranslations($entity);
+    if ($this->entityType->isRevisionable()) {
+      $entity->set('revision_type', $entity->isDefaultRevision());
+    }
     $this->doSaveFieldItems($entity);
 
     return $return;
diff --git a/core/lib/Drupal/Core/Entity/EntityFieldManager.php b/core/lib/Drupal/Core/Entity/EntityFieldManager.php
index d6e70eef75..9f5a3ad03e 100644
--- a/core/lib/Drupal/Core/Entity/EntityFieldManager.php
+++ b/core/lib/Drupal/Core/Entity/EntityFieldManager.php
@@ -221,6 +221,17 @@ protected function buildBaseFieldDefinitions($entity_type_id) {
     }
 
     // Make sure that revisionable entity types are correctly defined.
+    if ($entity_type->isRevisionable()) {
+      $base_field_definitions['revision_type'] = BaseFieldDefinition::create('boolean')
+        ->setLabel($this->t('Revision type'))
+        ->setDescription($this->t('A flag indicating whether this is a pending revision or a default revision.'))
+        ->setTranslatable(FALSE)
+        ->setRevisionable(TRUE)
+        ->setDefaultValue(TRUE);
+    }
+
+    // Make sure that revisionable and translatable entity types are correctly
+    // defined.
     if ($entity_type->isRevisionable() && $entity_type->isTranslatable()) {
       // The 'revision_translation_affected' field should always be defined.
       // This field has been added unconditionally in Drupal 8.4.0 and it is
diff --git a/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchemaConverter.php b/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchemaConverter.php
index 60712eeb21..fe1cc6f1c3 100644
--- a/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchemaConverter.php
+++ b/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchemaConverter.php
@@ -293,6 +293,10 @@ protected function copyData(array &$sandbox) {
         // returned was always TRUE.
         $entity->set($revision_translation_affected_key, TRUE);
 
+        // We cannot know what type the revision was so we assume the core
+        // default behavior of always creating a default revision.
+        $entity->set('revision_type', TRUE);
+
         // Treat the entity as new in order to make the storage do an INSERT
         // rather than an UPDATE.
         $entity->enforceIsNew(TRUE);
@@ -380,6 +384,19 @@ protected function updateFieldStorageDefinitionsToRevisionable(ContentEntityType
     }
     $updated_storage_definitions[$entity_type->getKey('revision')] = $revision_field;
 
+    $revision_type_field = BaseFieldDefinition::create('boolean')
+      ->setName('revision_type')
+      ->setLabel(new TranslatableMarkup('Revision type'))
+      ->setDescription(new TranslatableMarkup('A flag indicating whether this is a pending revision or a default revision.'))
+      ->setTranslatable(FALSE)
+      ->setRevisionable(TRUE)
+      ->setDefaultValue(TRUE);
+
+    if ($update_cached_definitions) {
+      $this->entityDefinitionUpdateManager->installFieldStorageDefinition($revision_type_field->getName(), $entity_type->id(), $entity_type->getProvider(), $revision_type_field);
+    }
+    $updated_storage_definitions[$revision_type_field->getName()] = $revision_type_field;
+
     // Add the 'revision_translation_affected' field if needed.
     if ($entity_type->isTranslatable()) {
       $revision_translation_affected_field = BaseFieldDefinition::create('boolean')
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentResourceTestBase.php
index 8b67cc62d2..1ba2f1ae49 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentResourceTestBase.php
@@ -121,6 +121,11 @@ protected function getExpectedNormalizedEntity() {
           'value' => TRUE,
         ],
       ],
+      'revision_type' => [
+        [
+          'value' => TRUE,
+        ],
+      ],
       'default_langcode' => [
         [
           'value' => TRUE,
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/Media/MediaResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/Media/MediaResourceTestBase.php
index 475a1ca6cb..3ce2eb3580 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/Media/MediaResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/Media/MediaResourceTestBase.php
@@ -210,6 +210,11 @@ protected function getExpectedNormalizedEntity() {
           'value' => TRUE,
         ],
       ],
+      'revision_type' => [
+        [
+          'value' => TRUE,
+        ],
+      ],
     ];
   }
 
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/Node/NodeResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/Node/NodeResourceTestBase.php
index 492ff642e4..b16cfb76a9 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/Node/NodeResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/Node/NodeResourceTestBase.php
@@ -152,6 +152,11 @@ protected function getExpectedNormalizedEntity() {
           'value' => TRUE,
         ],
       ],
+      'revision_type' => [
+        [
+          'value' => TRUE,
+        ],
+      ],
       'default_langcode' => [
         [
           'value' => TRUE,
diff --git a/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php b/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
index 5b71b93b7a..6de8ff7c4d 100644
--- a/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
+++ b/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
@@ -129,6 +129,9 @@ public function testNormalize() {
       'revision_translation_affected' => [
         ['value' => TRUE],
       ],
+      'revision_type' => [
+        ['value' => TRUE],
+      ],
       'non_rev_field' => [],
       'field_test_text' => [
         [
@@ -201,6 +204,7 @@ public function testSerialize() {
       'revision_id' => '<revision_id><value>' . $this->entity->getRevisionId() . '</value></revision_id>',
       'default_langcode' => '<default_langcode><value>1</value></default_langcode>',
       'revision_translation_affected' => '<revision_translation_affected><value>1</value></revision_translation_affected>',
+      'revision_type' => '<revision_type><value>1</value></revision_type>',
       'non_rev_field' => '<non_rev_field/>',
       'field_test_text' => '<field_test_text><value>' . $this->values['field_test_text']['value'] . '</value><format>' . $this->values['field_test_text']['format'] . '</format></field_test_text>',
     ];
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index bb69bd33f5..088c038608 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -2042,3 +2042,37 @@ function system_update_8403() {
     }
   }
 }
+
+/**
+ * Add the 'revision_type' field to all entity types.
+ */
+function system_update_8501() {
+  $definition_update_manager = \Drupal::entityDefinitionUpdateManager();
+
+  // Get a list of revisionable and translatable entity types.
+  /** @var \Drupal\Core\Entity\ContentEntityTypeInterface[] $definitions */
+  $definitions = array_filter(\Drupal::entityTypeManager()->getDefinitions(), function (EntityTypeInterface $entity_type) use ($definition_update_manager) {
+    if ($entity_type = $definition_update_manager->getEntityType($entity_type->id())) {
+      return $entity_type->isRevisionable();
+    }
+    return FALSE;
+  });
+
+  foreach ($definitions as $entity_type_id => $entity_type) {
+    $field_name = 'revision_type';
+
+    // Install the 'revision_type' field if needed.
+    if (!$definition_update_manager->getFieldStorageDefinition($field_name, $entity_type_id)) {
+      $storage_definition = BaseFieldDefinition::create('boolean')
+        ->setLabel(t('Revision type'))
+        ->setDescription(t('A flag indicating whether this is a pending revision or a default revision.'))
+        ->setTranslatable(FALSE)
+        ->setRevisionable(TRUE)
+        ->setDefaultValue(TRUE)
+        ->setInitialValue(TRUE);
+
+      $definition_update_manager
+        ->installFieldStorageDefinition($field_name, $entity_type_id, $entity_type_id, $storage_definition);
+    }
+  }
+}
diff --git a/core/tests/Drupal/FunctionalTests/Update/UpdatePathTestBase.php b/core/tests/Drupal/FunctionalTests/Update/UpdatePathTestBase.php
index 4aca50032b..a36d04dc15 100644
--- a/core/tests/Drupal/FunctionalTests/Update/UpdatePathTestBase.php
+++ b/core/tests/Drupal/FunctionalTests/Update/UpdatePathTestBase.php
@@ -374,7 +374,6 @@ protected function runUpdates() {
 
       // Ensure that the update hooks updated all entity schema.
       $needs_updates = \Drupal::entityDefinitionUpdateManager()->needsUpdates();
-      $this->assertFalse($needs_updates, 'After all updates ran, entity schema is up to date.');
       if ($needs_updates) {
         foreach (\Drupal::entityDefinitionUpdateManager()
           ->getChangeSummary() as $entity_type_id => $summary) {
@@ -383,6 +382,7 @@ protected function runUpdates() {
           }
         }
       }
+      $this->assertFalse($needs_updates, 'After all updates ran, entity schema is up to date.');
     }
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
index e2e4ae273e..542b5bfa05 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
@@ -113,6 +113,7 @@ public function testEntityTypeUpdateWithoutData() {
         // The revision key is now defined, so the revision field needs to be
         // created.
         t('The %field_name field needs to be installed.', ['%field_name' => 'Revision ID']),
+        t('The %field_name field needs to be installed.', ['%field_name' => 'Revision type']),
       ],
     ];
     $this->assertEqual($this->entityDefinitionUpdateManager->getChangeSummary(), $expected, 'EntityDefinitionUpdateManager reports the expected change summary.');