diff --git a/lib/private/Share/Share.php b/lib/private/Share/Share.php
index c624f24312..b37d167d89 100644
--- a/lib/private/Share/Share.php
+++ b/lib/private/Share/Share.php
@@ -520,60 +520,6 @@ class Share extends Constants {
 		return false;
 	}
 
-	/**
-	 * Get the owners of items shared with a user.
-	 *
-	 * @param string $user The user the items are shared with.
-	 * @param string $type The type of the items shared with the user.
-	 * @param boolean $includeCollections Include collection item types (optional)
-	 * @param boolean $includeOwner include owner in the list of users the item is shared with (optional)
-	 * @return array
-	 * @deprecated TESTS ONLY - this methods is only used by tests
-	 * called like this:
-	 * \OC\Share\Share::getSharedItemsOwners($this->user, $this->type, true)
-	 */
-	public static function getSharedItemsOwners($user, $type, $includeCollections = false, $includeOwner = false) {
-		// First, we find out if $type is part of a collection (and if that collection is part of
-		// another one and so on).
-		$collectionTypes = [];
-		if (!$includeCollections || !$collectionTypes = self::getCollectionItemTypes($type)) {
-			$collectionTypes[] = $type;
-		}
-
-		// Of these collection types, along with our original $type, we make a
-		// list of the ones for which a sharing backend has been registered.
-		// FIXME: Ideally, we wouldn't need to nest getItemsSharedWith in this loop but just call it
-		// with its $includeCollections parameter set to true. Unfortunately, this fails currently.
-		$allMaybeSharedItems = [];
-		foreach ($collectionTypes as $collectionType) {
-			if (isset(self::$backends[$collectionType])) {
-				$allMaybeSharedItems[$collectionType] = self::getItemsSharedWithUser(
-					$collectionType,
-					$user,
-					self::FORMAT_NONE
-				);
-			}
-		}
-
-		$owners = [];
-		if ($includeOwner) {
-			$owners[] = $user;
-		}
-
-		// We take a look at all shared items of the given $type (or of the collections it is part of)
-		// and find out their owners. Then, we gather the tags for the original $type from all owners,
-		// and return them as elements of a list that look like "Tag (owner)".
-		foreach ($allMaybeSharedItems as $collectionType => $maybeSharedItems) {
-			foreach ($maybeSharedItems as $sharedItem) {
-				if (isset($sharedItem['id'])) { //workaround for https://github.com/owncloud/core/issues/2814
-					$owners[] = $sharedItem['uid_owner'];
-				}
-			}
-		}
-
-		return $owners;
-	}
-
 	/**
 	 * Get shared items from the database
 	 * @param string $itemType
diff --git a/lib/private/TagManager.php b/lib/private/TagManager.php
index ecc80b271f..96786c58a1 100644
--- a/lib/private/TagManager.php
+++ b/lib/private/TagManager.php
@@ -76,6 +76,8 @@ class TagManager implements \OCP\ITagManager {
 	 * @param string $userId user for which to retrieve the tags, defaults to the currently
 	 * logged in user
 	 * @return \OCP\ITags
+	 *
+	 * since 20.0.0 $includeShared isn't used anymore
 	 */
 	public function load($type, $defaultTags = [], $includeShared = false, $userId = null) {
 		if (is_null($userId)) {
@@ -86,6 +88,6 @@ class TagManager implements \OCP\ITagManager {
 			}
 			$userId = $this->userSession->getUser()->getUId();
 		}
-		return new Tags($this->mapper, $userId, $type, $defaultTags, $includeShared);
+		return new Tags($this->mapper, $userId, $type, $defaultTags);
 	}
 }
diff --git a/lib/private/Tags.php b/lib/private/Tags.php
index 92263ca4fb..3fc66c69d6 100644
--- a/lib/private/Tags.php
+++ b/lib/private/Tags.php
@@ -119,18 +119,14 @@ class Tags implements ITags {
 	 * @param string $user The user whose data the object will operate on.
 	 * @param string $type The type of items for which tags will be loaded.
 	 * @param array $defaultTags Tags that should be created at construction.
-	 * @param boolean $includeShared Whether to include tags for items shared with this user by others.
+	 *
+	 * since 20.0.0 $includeShared isn't used anymore
 	 */
-	public function __construct(TagMapper $mapper, $user, $type, $defaultTags = [], $includeShared = false) {
+	public function __construct(TagMapper $mapper, $user, $type, $defaultTags = []) {
 		$this->mapper = $mapper;
 		$this->user = $user;
 		$this->type = $type;
-		$this->includeShared = $includeShared;
 		$this->owners = [$this->user];
-		if ($this->includeShared) {
-			$this->owners = array_merge($this->owners, \OC\Share\Share::getSharedItemsOwners($this->user, $this->type, true));
-			$this->backend = \OC\Share\Share::getBackend($this->type);
-		}
 		$this->tags = $this->mapper->loadTags($this->owners, $this->type);
 
 		if (count($defaultTags) > 0 && count($this->tags) === 0) {
@@ -303,22 +299,7 @@ class Tags implements ITags {
 
 		if (!is_null($result)) {
 			while ($row = $result->fetchRow()) {
-				$id = (int)$row['objid'];
-
-				if ($this->includeShared) {
-					// We have to check if we are really allowed to access the
-					// items that are tagged with $tag. To that end, we ask the
-					// corresponding sharing backend if the item identified by $id
-					// is owned by any of $this->owners.
-					foreach ($this->owners as $owner) {
-						if ($this->backend->isValidSource($id, $owner)) {
-							$ids[] = $id;
-							break;
-						}
-					}
-				} else {
-					$ids[] = $id;
-				}
+				$ids[] = (int)$row['objid'];
 			}
 		}
 
diff --git a/lib/public/ITagManager.php b/lib/public/ITagManager.php
index 46e1ba0629..9003beb8a2 100644
--- a/lib/public/ITagManager.php
+++ b/lib/public/ITagManager.php
@@ -54,11 +54,11 @@ interface ITagManager {
 	 * @see \OCP\ITags
 	 * @param string $type The type identifier e.g. 'contact' or 'event'.
 	 * @param array $defaultTags An array of default tags to be used if none are stored.
-	 * @param boolean $includeShared Whether to include tags for items shared with this user by others.
+	 * @param boolean $includeShared Whether to include tags for items shared with this user by others. - always false since 20.0.0
 	 * @param string $userId user for which to retrieve the tags, defaults to the currently
 	 * logged in user
 	 * @return \OCP\ITags
-	 * @since 6.0.0 - parameter $includeShared and $userId were added in 8.0.0
+	 * @since 6.0.0 - parameter $includeShared and $userId were added in 8.0.0 - $includeShared is always false since 20.0.0
 	 */
 	public function load($type, $defaultTags = [], $includeShared = false, $userId = null);
 }
diff --git a/tests/lib/TagsTest.php b/tests/lib/TagsTest.php
index 38d3d611bb..69c2833433 100644
--- a/tests/lib/TagsTest.php
+++ b/tests/lib/TagsTest.php
@@ -24,7 +24,6 @@ namespace Test;
 
 use OCP\IUser;
 use OCP\IUserSession;
-use OCP\Share\IShare;
 
 /**
  * Class TagsTest
@@ -287,39 +286,4 @@ class TagsTest extends \Test\TestCase {
 		$this->assertTrue($tagger->removeFromFavorites(1));
 		$this->assertEquals([], $tagger->getFavorites());
 	}
-
-	public function testShareTags() {
-		$testTag = 'TestTag';
-		\OC\Share\Share::registerBackend('test', 'Test\Share\Backend');
-
-		$tagger = $this->tagMgr->load('test');
-		$tagger->tagAs(1, $testTag);
-
-
-		$otherUserId = $this->getUniqueID('user2_');
-		$otherUser = $this->createMock(IUser::class);
-		$otherUser->method('getUID')
-			->willReturn($otherUserId);
-
-		\OC::$server->getUserManager()->createUser($otherUserId, 'pass');
-		\OC_User::setUserId($otherUserId);
-		$otherUserSession = $this->createMock(IUserSession::class);
-		$otherUserSession
-			->expects($this->any())
-			->method('getUser')
-			->willReturn($otherUser);
-
-		$otherTagMgr = new \OC\TagManager($this->tagMapper, $otherUserSession);
-		$otherTagger = $otherTagMgr->load('test');
-		$this->assertFalse($otherTagger->hasTag($testTag));
-
-		\OC_User::setUserId($this->user->getUID());
-		// TODO new sharing
-		\OC\Share\Share::shareItem('test', 1, IShare::TYPE_USER, $otherUserId, \OCP\Constants::PERMISSION_READ);
-
-		\OC_User::setUserId($otherUserId);
-		$otherTagger = $otherTagMgr->load('test', [], true); // Update tags, load shared ones.
-		$this->assertTrue($otherTagger->hasTag($testTag));
-		$this->assertContains(1, $otherTagger->getIdsForTag($testTag));
-	}
 }