diff --git a/src/Token/AbstractToken.php b/src/Token/AbstractToken.php
new file mode 100644
index 00000000..af2316f4
--- /dev/null
+++ b/src/Token/AbstractToken.php
@@ -0,0 +1,93 @@
+<?php
+/**
+ * This file is part of the league/oauth2-client library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Alex Bilbie <hello@alexbilbie.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ * @link http://thephpleague.com/oauth2-client/ Documentation
+ * @link https://packagist.org/packages/league/oauth2-client Packagist
+ * @link https://github.com/thephpleague/oauth2-client GitHub
+ */
+
+namespace League\OAuth2\Client\Token;
+
+abstract class AbstractToken {
+
+  /**
+   * @var int
+   */
+  protected $expires;
+
+  /**
+   * @var array
+   */
+  protected $values = [];
+
+  /**
+   * @var int
+   */
+  private static $timeNow;
+
+  /**
+   * Constructs an access token.
+   *
+   * @param array $options An array of options returned by the service provider
+   *     in the access token request. The `access_token` option is required.
+   * @throws InvalidArgumentException if `access_token` is not provided in `$options`.
+   */
+  public function __construct(array $options = []) {
+    // We need to know when the token expires. Show preference to
+    // 'expires_in' since it is defined in RFC6749 Section 5.1.
+    // Defer to 'expires' if it is provided instead.
+    if (isset($options['expires_in'])) {
+      if (!is_numeric($options['expires_in'])) {
+        throw new \InvalidArgumentException('expires_in value must be an integer');
+      }
+
+      $this->expires = $options['expires_in'] != 0 ? $this->getTimeNow() + $options['expires_in'] : 0;
+    } elseif (!empty($options['expires'])) {
+      // Some providers supply the seconds until expiration rather than
+      // the exact timestamp. Take a best guess at which we received.
+      $expires = $options['expires'];
+
+      if (!$this->isExpirationTimestamp($expires)) {
+        $expires += $this->getTimeNow();
+      }
+
+      $this->expires = $expires;
+    }
+  }
+
+  /**
+   * Set the time now. This should only be used for testing purposes.
+   *
+   * @param int $timeNow the time in seconds since epoch
+   * @return void
+   */
+  public static function setTimeNow($timeNow)
+  {
+    self::$timeNow = $timeNow;
+  }
+
+  /**
+   * Reset the time now if it was set for test purposes.
+   *
+   * @return void
+   */
+  public static function resetTimeNow()
+  {
+    self::$timeNow = null;
+  }
+
+  /**
+   * @return int
+   */
+  public function getTimeNow()
+  {
+    return self::$timeNow ? self::$timeNow : time();
+  }
+
+}
diff --git a/src/Token/AccessToken.php b/src/Token/AccessToken.php
index 0f0206a4..0fd85e1a 100644
--- a/src/Token/AccessToken.php
+++ b/src/Token/AccessToken.php
@@ -22,7 +22,10 @@
  *
  * @link http://tools.ietf.org/html/rfc6749#section-1.4 Access Token (RFC 6749, §1.4)
  */
-class AccessToken implements AccessTokenInterface, ResourceOwnerAccessTokenInterface, SettableRefreshTokenInterface
+class AccessToken extends AbstractToken implements
+    AccessTokenInterface,
+    ResourceOwnerAccessTokenInterface,
+    SettableRefreshTokenInterface
 {
     /**
      * @var string
@@ -44,54 +47,12 @@ class AccessToken implements AccessTokenInterface, ResourceOwnerAccessTokenInter
      */
     protected $resourceOwnerId;
 
-    /**
-     * @var array
-     */
-    protected $values = [];
-
-    /**
-     * @var int
-     */
-    private static $timeNow;
-
-    /**
-     * Set the time now. This should only be used for testing purposes.
-     *
-     * @param int $timeNow the time in seconds since epoch
-     * @return void
-     */
-    public static function setTimeNow($timeNow)
-    {
-        self::$timeNow = $timeNow;
-    }
-
-    /**
-     * Reset the time now if it was set for test purposes.
-     *
-     * @return void
-     */
-    public static function resetTimeNow()
-    {
-        self::$timeNow = null;
-    }
-
-    /**
-     * @return int
-     */
-    public function getTimeNow()
-    {
-        return self::$timeNow ? self::$timeNow : time();
-    }
-
-    /**
-     * Constructs an access token.
-     *
-     * @param array $options An array of options returned by the service provider
-     *     in the access token request. The `access_token` option is required.
-     * @throws InvalidArgumentException if `access_token` is not provided in `$options`.
-     */
+  /**
+   * @inheritDoc
+   */
     public function __construct(array $options = [])
     {
+        parent::__construct($options);
         if (empty($options['access_token'])) {
             throw new InvalidArgumentException('Required option not passed: "access_token"');
         }
@@ -106,27 +67,6 @@ public function __construct(array $options = [])
             $this->refreshToken = $options['refresh_token'];
         }
 
-        // We need to know when the token expires. Show preference to
-        // 'expires_in' since it is defined in RFC6749 Section 5.1.
-        // Defer to 'expires' if it is provided instead.
-        if (isset($options['expires_in'])) {
-            if (!is_numeric($options['expires_in'])) {
-                throw new \InvalidArgumentException('expires_in value must be an integer');
-            }
-
-            $this->expires = $options['expires_in'] != 0 ? $this->getTimeNow() + $options['expires_in'] : 0;
-        } elseif (!empty($options['expires'])) {
-            // Some providers supply the seconds until expiration rather than
-            // the exact timestamp. Take a best guess at which we received.
-            $expires = $options['expires'];
-
-            if (!$this->isExpirationTimestamp($expires)) {
-                $expires += $this->getTimeNow();
-            }
-
-            $this->expires = $expires;
-        }
-
         // Capture any additional values that might exist in the token but are
         // not part of the standard response. Vendors will sometimes pass
         // additional user data this way.
diff --git a/src/Token/IdToken.php b/src/Token/IdToken.php
new file mode 100644
index 00000000..b294225b
--- /dev/null
+++ b/src/Token/IdToken.php
@@ -0,0 +1,29 @@
+<?php
+/**
+ * This file is part of the league/oauth2-client library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Alex Bilbie <hello@alexbilbie.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ * @link http://thephpleague.com/oauth2-client/ Documentation
+ * @link https://packagist.org/packages/league/oauth2-client Packagist
+ * @link https://github.com/thephpleague/oauth2-client GitHub
+ */
+
+namespace League\OAuth2\Client\Token;
+
+class IdToken extends AbstractToken implements ResourceOwnerTokenInterface {
+
+  /**
+   * @inheritDoc
+   */
+  public function __construct(array $options = []) {
+    parent::__construct($options);
+    if (!empty($options['resource_owner_id'])) {
+      $this->resourceOwnerId = $options['resource_owner_id'];
+    }
+  }
+
+}
diff --git a/src/Token/ResourceOwnerAccessTokenInterface.php b/src/Token/ResourceOwnerAccessTokenInterface.php
index 51e4ce41..225c743c 100644
--- a/src/Token/ResourceOwnerAccessTokenInterface.php
+++ b/src/Token/ResourceOwnerAccessTokenInterface.php
@@ -14,12 +14,5 @@
 
 namespace League\OAuth2\Client\Token;
 
-interface ResourceOwnerAccessTokenInterface extends AccessTokenInterface
-{
-    /**
-     * Returns the resource owner identifier, if defined.
-     *
-     * @return string|null
-     */
-    public function getResourceOwnerId();
-}
+interface ResourceOwnerAccessTokenInterface extends AccessTokenInterface, ResourceOwnerTokenInterface
+{}
diff --git a/src/Token/ResourceOwnerTokenInterface.php b/src/Token/ResourceOwnerTokenInterface.php
new file mode 100644
index 00000000..240b6cc0
--- /dev/null
+++ b/src/Token/ResourceOwnerTokenInterface.php
@@ -0,0 +1,25 @@
+<?php
+/**
+ * This file is part of the league/oauth2-client library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Alex Bilbie <hello@alexbilbie.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ * @link http://thephpleague.com/oauth2-client/ Documentation
+ * @link https://packagist.org/packages/league/oauth2-client Packagist
+ * @link https://github.com/thephpleague/oauth2-client GitHub
+ */
+
+namespace League\OAuth2\Client\Token;
+
+interface ResourceOwnerTokenInterface
+{
+  /**
+   * Returns the resource owner identifier, if defined.
+   *
+   * @return string|null
+   */
+  public function getResourceOwnerId();
+}