diff -u b/src/Plugin/Preprocess/FormElementLabel.php b/src/Plugin/Preprocess/FormElementLabel.php
--- b/src/Plugin/Preprocess/FormElementLabel.php
+++ b/src/Plugin/Preprocess/FormElementLabel.php
@@ -23,12 +23,6 @@
    * {@inheritdoc}
    */
   public function preprocessElement(Element $element, Variables $variables) {
-    // Labels for single checkboxes/radios contain the element itself and thus
-    // have always to be rendered regardless of whether they have a title.
-    if ($element->getProperty('is_checkbox') || $element->getProperty('is_radio')) {
-      $variables['allow_empty'] = TRUE;
-    }
-
     // Map the element properties.
     $variables->map(['attributes', 'is_checkbox', 'is_radio']);
 
diff -u b/starterkits/sass/sass/component/_form.scss b/starterkits/sass/sass/component/_form.scss
--- b/starterkits/sass/sass/component/_form.scss
+++ b/starterkits/sass/sass/component/_form.scss
@@ -4,13 +4,11 @@
 
 // Checkboxes / radio buttons.
 .checkbox, .radio {
-  &.form-no-label {
-    // Remove top/bottom margins when in table context, because this is most
-    // likely a tableselect checkbox element.
-    table & {
-      margin-bottom: 0;
-      margin-top: 0;
-    }
+  // Remove top/bottom margins when in table context, because this is most
+  // likely a tableselect checkbox element.
+  table &.form-no-label {
+    margin-bottom: 0;
+    margin-top: 0;
   }
 }
 
diff -u b/templates/input/form-element-label.html.twig b/templates/input/form-element-label.html.twig
--- b/templates/input/form-element-label.html.twig
+++ b/templates/input/form-element-label.html.twig
@@ -11,7 +11,6 @@
  * - required: An indicator for whether the associated form element is required.
  * - is_checkbox: Whether the label is outputted in checkbox context.
  * - is_radio: Whether the label is outputted in radio button context.
- * - allow_empty: Whether ouput the label even if the actual title is empty.
  * - attributes: A list of HTML attributes for the label.
  *
  * @ingroup templates
@@ -29,10 +28,18 @@
   ]
 -%}
 {% if title is not empty and title_display == 'invisible' and (is_checkbox or is_radio) -%}
-  {%- set attributes = attributes.setAttribute('title', title) -%}
   {%- set title = null -%}
+  {#
+  Preserve label text as attribute (e.g. for screen readers) for
+  checkboxes/radio buttons when it actually should be invisible.
+  #}
+  {%- set attributes = attributes.setAttribute('title', title) -%}
 {%- endif -%}
-{%- if title is not empty or allow_empty -%}
+{#
+Labels for single checkboxes/radios contain the element itself and thus have
+always to be rendered regardless of whether they have a title or not.
+#}
+{%- if title is not empty or is_checkbox or is_radio -%}
   <label{{ attributes.addClass(classes) }}>{{ element }}{{ title }}
     {%- if description -%}
       <p class="help-block">{{ description }}</p>