diff --git a/CHANGELOG.md b/CHANGELOG.md
index ca989385..670ce429 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ before starting to add changes. Use example [placed in the end of the page](#exa
 ## [Unreleased]
 
 - [OS-58] New company address fields
+- Custom permissions by term field
 
 ## [3.10.0] 2023-08-23
 
diff --git a/modules/os2forms_permissions_by_term/os2forms_permissions_by_term.links.menu.yml b/modules/os2forms_permissions_by_term/os2forms_permissions_by_term.links.menu.yml
new file mode 100644
index 00000000..07842015
--- /dev/null
+++ b/modules/os2forms_permissions_by_term/os2forms_permissions_by_term.links.menu.yml
@@ -0,0 +1,5 @@
+os2web_permissions_by_term.settings:
+  title: OS2Forms permissions by term
+  description: Settings for OS2Forms permissions by term.
+  route_name: os2web_permissions_by_term.settings_form
+  parent: system.admin_config_system
diff --git a/modules/os2forms_permissions_by_term/os2forms_permissions_by_term.module b/modules/os2forms_permissions_by_term/os2forms_permissions_by_term.module
index 79185ac9..12ea7298 100644
--- a/modules/os2forms_permissions_by_term/os2forms_permissions_by_term.module
+++ b/modules/os2forms_permissions_by_term/os2forms_permissions_by_term.module
@@ -9,6 +9,7 @@ use Drupal\Core\Config\Entity\ConfigEntityInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\node\NodeInterface;
+use Drupal\os2forms_permissions_by_term\Form\SettingsForm;
 use Drupal\views\Plugin\views\query\QueryPluginBase;
 use Drupal\views\ViewExecutable;
 use Drupal\webform\WebformInterface;
@@ -138,3 +139,37 @@ function os2forms_permissions_by_term_options_list_alter(array &$options, array
 function os2forms_permissions_by_term_views_query_alter(ViewExecutable $view, QueryPluginBase $query) {
   \Drupal::service('os2forms_permissions_by_term.maestro_template_helper')->viewsQueryAlter($view, $query);
 }
+
+/**
+ * Implements hook_user_update().
+ */
+function os2forms_permissions_by_term_user_update($account) {
+  $config = \Drupal::config(SettingsForm::$configName);
+
+  if ($customField = $config->get('os2web_permissions_by_term_custom_field')) {
+    if ($account->get($customField)) {
+      $accessTerms = $account->get($customField)->referencedEntities();
+
+      /** @var \Drupal\permissions_by_term\Service\AccessStorage $access_storage */
+      $access_storage = \Drupal::service('permissions_by_term.access_storage');
+
+      // First, we delete existing values from the db.
+      $access_storage->deleteAllTermPermissionsByUserId($account->id());
+
+      if (!empty($accessTerms)) {
+        // For term permissions use user preferred language.
+        $langcode = $account->getPreferredLangcode();
+
+        // Second, we insert updated values.
+        foreach ($accessTerms as $accessTerm) {
+          $access_storage->addTermPermissionsByUserIds([$account->id()], $accessTerm->id(), $langcode);
+        }
+      }
+
+      // Rebuild permissions for nodes if needed.
+      if (!\Drupal::config('permissions_by_term.settings')->get('disable_node_access_records')) {
+        node_access_rebuild(TRUE);
+      }
+    }
+  }
+}
diff --git a/modules/os2forms_permissions_by_term/os2forms_permissions_by_term.routing.yml b/modules/os2forms_permissions_by_term/os2forms_permissions_by_term.routing.yml
new file mode 100644
index 00000000..497cbfe5
--- /dev/null
+++ b/modules/os2forms_permissions_by_term/os2forms_permissions_by_term.routing.yml
@@ -0,0 +1,7 @@
+os2web_permissions_by_term.settings_form:
+  path: '/admin/config/system/os2forms_permissions_by_term'
+  defaults:
+    _title: 'OS2Forms Permissions by terms'
+    _form: 'Drupal\os2forms_permissions_by_term\Form\SettingsForm'
+  requirements:
+    _permission: 'administer site configuration'
diff --git a/modules/os2forms_permissions_by_term/src/Form/SettingsForm.php b/modules/os2forms_permissions_by_term/src/Form/SettingsForm.php
new file mode 100644
index 00000000..9ba8c596
--- /dev/null
+++ b/modules/os2forms_permissions_by_term/src/Form/SettingsForm.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace Drupal\os2forms_permissions_by_term\Form;
+
+use Drupal\Core\Form\ConfigFormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Configure os2web_permissions_by_term settings for this site.
+ */
+class SettingsForm extends ConfigFormBase {
+
+  /**
+   * Name of the config.
+   *
+   * @var string
+   */
+  public static $configName = 'os2web_permissions_by_term.settings';
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'os2web_permissions_by_term_settings';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getEditableConfigNames() {
+    return [SettingsForm::$configName];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $options = [0 => t('None')];
+
+    $userFields = \Drupal::service('entity_field.manager')->getFieldDefinitions('user', 'user');
+
+    /** @var \Drupal\field\Entity\FieldConfig $field */
+    foreach ($userFields as $field_key => $field) {
+      // If fieldType is entity_reference, we only support taxonomy terms.
+      if ($field->getType() == 'entity_reference' && $field->getSetting('target_type') == 'taxonomy_term') {
+        $options[$field_key] = $field_key;
+      }
+    }
+
+    $form['os2web_permissions_by_term_custom_field'] = [
+      '#type' => 'select',
+      '#options' => $options,
+      '#title' => $this->t('Permissions by term custom field'),
+      '#description' => $this->t('The value of this custom field is mapped to Permission by term real field on hook_user_update().'),
+      '#default_value' => $this->config(SettingsForm::$configName)
+        ->get('os2web_permissions_by_term_custom_field'),
+    ];
+
+    return parent::buildForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $values = $form_state->getValues();
+
+    $config = $this->config(SettingsForm::$configName);
+    foreach ($values as $key => $value) {
+      $config->set($key, $value);
+    }
+    $config->save();
+
+    parent::submitForm($form, $form_state);
+  }
+
+}