diff -u b/core/modules/migrate/src/MigrateIdAuditor.php b/core/modules/migrate/src/MigrateIdAuditor.php
--- b/core/modules/migrate/src/MigrateIdAuditor.php
+++ b/core/modules/migrate/src/MigrateIdAuditor.php
@@ -5,26 +5,15 @@
 use Drupal\Core\StringTranslation\TranslatableMarkup;
 use Drupal\migrate\Plugin\MigrateDestinationAuditInterface;
 use Drupal\migrate\Plugin\MigrateIdMapAuditInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
 
 /**
  * Audits a set of migrations for potential ID conflicts.
  */
-class MigrateIdAuditor {
+class MigrateIdAuditor implements MigrateIdAuditorInterface {
 
   /**
-   * Audits a set of migrations for potential ID conflicts.
-   *
-   * ID conflicts exist if new content has been created without the migration
-   * system knowing about it. To find out if there is ID conflicts, this method
-   * should compare the highest destination ID to the highest migrated ID. If
-   * the former is greater than the later, there is ID conflicts.
-   *
-   * @param \Drupal\migrate\Plugin\MigrationInterface[] $migrations
-   *   The set of migrations to audit.
-   *
-   * @return string[]
-   *   The entity type IDs of migrated content that may have conflicting IDs.
-   *   If no conflicts are found, an empty array will be returned.
+   * {@inheritdoc}
    */
   public function auditIds(array $migrations) {
     $conflicts = [];
@@ -36,20 +25,14 @@
         if ($destination instanceof MigrateDestinationAuditInterface && $id_map instanceof MigrateIdMapAuditInterface) {
           $field_name = $destination->getAuditedIdFieldName();
           if ($destination->getHighestDestinationId($field_name) > $id_map->getHighestMigratedId($field_name)) {
-            $base_id = $migration->getBaseId();
-            $label = $migration->label();
-            if (is_string($label)) {
-              $conflicts[$base_id] = $label;
-            }
-            elseif ($label instanceof TranslatableMarkup) {
-              $arguments = $label->getArguments();
-              if (isset($arguments['@label'])) {
-                $conflicts[$base_id] = $arguments['@label'];
-              }
-              else {
-                $conflicts[$base_id] = $label->render();
-              }
-            }
+            $conflicts += $this->buildConflict($migration);
+          }
+          elseif ($destination->isTranslationDestination()) {
+            // @TODO: Figure out how to determine if this will result in conflicts.
+            // Hint, I don't think this is possible by simply comparing highest id.
+            // For now, blindly warn it *is* a conflict, even though it very
+            // well might not. It would only effects term and node translation migrations.
+            $conflicts += $this->buildConflict($migration);
           }
         }
       }
@@ -59,2 +42,26 @@
 
+  /**
+   * Build conflict label.
+   *
+   * @param \Drupal\migrate\Plugin\MigrationInterface $migration
+   *
+   * @return array
+   */
+  protected function buildConflict(MigrationInterface $migration) {
+    $conflict = [];
+    $base_id = $migration->getBaseId();
+    $label = $migration->label();
+    if (is_string($label)) {
+      $conflict[$base_id] = $label;
+    }
+    elseif ($label instanceof TranslatableMarkup) {
+      $conflict[$base_id] = $label->render();
+      if (isset($label->getArguments()['@label'])) {
+        $conflict[$base_id] = $label->getArguments()['@label'];
+      }
+    }
+
+    return $conflict;
+  }
+
 }
diff -u b/core/modules/migrate/src/Plugin/MigrateDestinationAuditInterface.php b/core/modules/migrate/src/Plugin/MigrateDestinationAuditInterface.php
--- b/core/modules/migrate/src/Plugin/MigrateDestinationAuditInterface.php
+++ b/core/modules/migrate/src/Plugin/MigrateDestinationAuditInterface.php
@@ -33,2 +33,10 @@
 
+  /**
+   * Get whether this destination is for translations.
+   *
+   * @return bool
+   *   Whether this destination is for translations.
+   */
+  public function isTranslationDestination();
+
 }
diff -u b/core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php b/core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php
--- b/core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php
+++ b/core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php
@@ -119,12 +119,9 @@
   }
 
   /**
-   * Get whether this destination is for translations.
-   *
-   * @return bool
-   *   Whether this destination is for translations.
+   * {@inheritdoc}
    */
-  protected function isTranslationDestination() {
+  public function isTranslationDestination() {
     return !empty($this->configuration['translations']);
   }
 
diff -u b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
--- b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
+++ b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
@@ -8,7 +8,7 @@
 use Drupal\Core\Render\RendererInterface;
 use Drupal\Core\State\StateInterface;
 use Drupal\Core\Url;
-use Drupal\migrate\MigrateIdAuditor;
+use Drupal\migrate\MigrateIdAuditorInterface;
 use Drupal\migrate\Plugin\MigrationPluginManagerInterface;
 use Drupal\migrate_drupal_ui\Batch\MigrateUpgradeImportBatch;
 use Drupal\migrate_drupal\MigrationConfigurationTrait;
@@ -52,7 +52,7 @@
   /**
    * The ID conflict auditor.
    *
-   * @var \Drupal\migrate\MigrateIdAuditor $idAuditor
+   * @var \Drupal\migrate\MigrateIdAuditorInterface $idAuditor
    */
   protected $idAuditor;
 
@@ -67,10 +67,10 @@
    *   The renderer service.
    * @param \Drupal\migrate\Plugin\MigrationPluginManagerInterface $plugin_manager
    *   The migration plugin manager.
-   * @param \Drupal\migrate\MigrateIdAuditor $id_auditor
+   * @param \Drupal\migrate\MigrateIdAuditorInterface $id_auditor
    *   The ID conflict auditor.
    */
-  public function __construct(StateInterface $state, DateFormatterInterface $date_formatter, RendererInterface $renderer, MigrationPluginManagerInterface $plugin_manager, MigrateIdAuditor $id_auditor) {
+  public function __construct(StateInterface $state, DateFormatterInterface $date_formatter, RendererInterface $renderer, MigrationPluginManagerInterface $plugin_manager, MigrateIdAuditorInterface $id_auditor) {
     $this->state = $state;
     $this->dateFormatter = $date_formatter;
     $this->renderer = $renderer;
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/migrate/src/MigrateIdAuditorInterface.php
@@ -0,0 +1,28 @@
+<?php
+
+
+namespace Drupal\migrate;
+
+/**
+ * Audits a set of migrations for potential ID conflicts.
+ */
+interface MigrateIdAuditorInterface {
+
+  /**
+   * Audits a set of migrations for potential ID conflicts.
+   *
+   * ID conflicts exist if new content has been created without the migration
+   * system knowing about it. To find out if there is ID conflicts, this method
+   * should compare the highest destination ID to the highest migrated ID. If
+   * the former is greater than the later, there is ID conflicts.
+   *
+   * @param \Drupal\migrate\Plugin\MigrationInterface[] $migrations
+   *   The set of migrations to audit.
+   *
+   * @return string[]
+   *   The entity type IDs of migrated content that may have conflicting IDs.
+   *   If no conflicts are found, an empty array will be returned.
+   */
+  public function auditIds(array $migrations);
+
+}