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
@@ -27,13 +27,6 @@
           if ($destination->getHighestDestinationId($field_name) > $id_map->getHighestMigratedId($field_name)) {
             $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);
-          }
         }
       }
     }
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
@@ -7,8 +7,11 @@
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Render\RendererInterface;
 use Drupal\Core\State\StateInterface;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
 use Drupal\Core\Url;
 use Drupal\migrate\MigrateIdAuditorInterface;
+use Drupal\migrate\Plugin\MigrateDestinationAuditInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
 use Drupal\migrate\Plugin\MigrationPluginManagerInterface;
 use Drupal\migrate_drupal_ui\Batch\MigrateUpgradeImportBatch;
 use Drupal\migrate_drupal\MigrationConfigurationTrait;
@@ -454,24 +457,55 @@
     $migration_ids = array_keys($form_state->get('migrations'));
     $migrations = $this->pluginManager->createInstances($migration_ids);
     $conflicts = $this->idAuditor->auditIds($migrations);
-    if (empty($conflicts)) {
+
+    $i18n = [];
+    foreach ($migrations as $migration) {
+      if ($migration->getDestinationPlugin() instanceof MigrateDestinationAuditInterface) {
+        if ($migration->getDestinationPlugin()->isTranslationDestination()) {
+          $i18n += $this->buildConflict($migration);
+        }
+      }
+    }
+    if (empty($conflicts) && empty($i18n)) {
       $form_state->set('step', 'confirm');
       return $this->buildForm($form, $form_state);
     }
 
+    $form['warning'] = [
+      '#type' => 'markup',
+      '#markup' => '<h3>' . $this->t('Entities may be overwritten') . '</h3>',
+    ];
     $form = parent::buildForm($form, $form_state);
     $form['actions']['submit']['#submit'] = ['::submitConfirmIdConflictForm'];
     $form['actions']['submit']['#value'] = $this->t('I acknowledge I may lose data, continue anyway.');
 
-    $form['warning'] = [
-      '#type' => 'markup',
-      '#markup' => '<h3>' . $this->t('Entities may be overwritten') . '</h3>' .
-        '<p>' . $this->t('Upgrades work on brand new sites, or sites with previously upgraded data. However, it looks like you have content in your site that is unknown to the migrate system; perhaps manually added. These new entities <strong>may be overwritten</strong> if you run this upgrade. For more information, see the online handbook entry for <a target="_blank" href=":id-conflicts-handbook">handling migration conflicts.</a>.', [':id-conflicts-handbook' => 'https://www.drupal.org/docs/8/upgrade/known-issues-when-upgrading-from-drupal-6-or-7-to-drupal-8#id_conflicts']) . '</p>',
-    ];
+    $form = $this->conflictsForm($form, $form_state, $conflicts);
+    return $this->i18nWarningForm($form, $form_state, $i18n);
+  }
+
+  /**
+   * Build the markup for conflict warnings.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   * @param array
+   *   The conflicted migration labels.
+   *
+   * @return array
+   *   The form structure.
+   */
+  protected function conflictsForm(array &$form, FormStateInterface $form_state, $conflicts) {
+    if (empty($conflicts)) {
+      return $form;
+    }
+
+    $form['warning']['#markup'] .= '<p>' . $this->t('Upgrades work on brand new sites, or sites with previously upgraded data. However, it looks like you have content in your site that is unknown to the migrate system; perhaps manually added. These new entities <strong>may be overwritten</strong> if you run this upgrade. For more information, see the online handbook entry for <a target="_blank" href=":id-conflicts-handbook">handling migration conflicts.</a>.', [':id-conflicts-handbook' => 'https://www.drupal.org/docs/8/upgrade/known-issues-when-upgrading-from-drupal-6-or-7-to-drupal-8#id_conflicts']) . '</p>';
 
     sort($conflicts);
-    $form['type_list'] = [
-      '#title' => $this->t('These entities are of the following types:'),
+    $form['conflicts'] = [
+      '#title' => $this->t('These conflicting entities are of the following types:'),
       '#theme' => 'item_list',
       '#items' => $conflicts,
     ];
@@ -480,6 +514,36 @@
   }
 
   /**
+   * Build the markup for i18n warnings.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   * @param array
+   *   The internationalization migration labels.
+   *
+   * @return array
+   *   The form structure.
+   */
+  protected function i18nWarningForm(array &$form, FormStateInterface $form_state, $i18n) {
+    if (empty($i18n)) {
+      return $form;
+    }
+
+    $form['warning']['#markup'] .= '<p>' . $this->t('It looks like you are migrating translated content. Be extra cautious and make sure you aren\'t introducting any conflicts. For more on the subject, see the online handbook entry for <a target="_blank" href=":id-conflicts-handbook">handling migration conflicts.</a>.<a target="_blank" href=":id-conflicts-handbook">handling migration conflicts.</a>.', [':id-conflicts-handbook' => 'https://www.drupal.org/docs/8/upgrade/known-issues-when-upgrading-from-drupal-6-or-7-to-drupal-8#id_conflicts']) . '</p>';
+
+    sort($i18n);
+    $form['i18n'] = [
+      '#title' => $this->t('These translatable entities are of the following types:'),
+      '#theme' => 'item_list',
+      '#items' => $i18n,
+    ];
+
+    return $form;
+  }
+
+  /**
    * Submission handler for the confirmation form.
    *
    * @param array $form
@@ -681,2 +745,29 @@
 
+  /**
+   * Build conflict label.
+   *
+   * @param \Drupal\migrate\Plugin\MigrationInterface $migration
+   *
+   * @TODO: This is a duplicate of MigrateIdAuditor::buildConflict() and should
+   * eventually be removed in https://www.drupal.org/node/2905759
+   *
+   * @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;
+  }
+
 }