diff --git a/.travis.yml b/.travis.yml
index b7e3aa7093..f7ca29f130 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -37,7 +37,7 @@ matrix:
 
 env:
   global:
-    - STRIPE_MOCK_VERSION=0.105.0
+    - STRIPE_MOCK_VERSION=0.106.0
 cache:
   directories:
     - $HOME/.composer/cache/files
diff --git a/tests/Stripe/Service/TaxCodeServiceTest.php b/tests/Stripe/Service/TaxCodeServiceTest.php
new file mode 100644
index 0000000000..4a4b39df23
--- /dev/null
+++ b/tests/Stripe/Service/TaxCodeServiceTest.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace Stripe\Service;
+
+/**
+ * @internal
+ * @covers \Stripe\Service\TaxCodeService
+ */
+final class TaxCodeServiceTest extends \PHPUnit\Framework\TestCase
+{
+    use \Stripe\TestHelper;
+
+    const TEST_RESOURCE_ID = 'txcd_123';
+
+    /** @var \Stripe\StripeClient */
+    private $client;
+
+    /** @var TaxCodeService */
+    private $service;
+
+    /**
+     * @before
+     */
+    protected function setUpService()
+    {
+        $this->client = new \Stripe\StripeClient(['api_key' => 'sk_test_123', 'api_base' => MOCK_URL]);
+        $this->service = new TaxCodeService($this->client);
+    }
+
+    public function testAll()
+    {
+        $this->expectsRequest(
+            'get',
+            '/v1/tax_codes'
+        );
+        $resources = $this->service->all();
+        static::assertInternalType('array', $resources->data);
+        static::assertInstanceOf(\Stripe\TaxCode::class, $resources->data[0]);
+    }
+
+    public function testRetrieve()
+    {
+        $this->expectsRequest(
+            'get',
+            '/v1/tax_codes/' . self::TEST_RESOURCE_ID
+        );
+        $resource = $this->service->retrieve(self::TEST_RESOURCE_ID);
+        static::assertInstanceOf(\Stripe\TaxCode::class, $resource);
+    }
+}
diff --git a/tests/Stripe/TaxCode.php b/tests/Stripe/TaxCode.php
new file mode 100644
index 0000000000..744f2529e4
--- /dev/null
+++ b/tests/Stripe/TaxCode.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Stripe;
+
+/**
+ * @internal
+ * @covers \Stripe\TaxCode
+ */
+final class TaxCodeTest extends \PHPUnit\Framework\TestCase
+{
+    use TestHelper;
+
+    const TEST_RESOURCE_ID = 'txcd_123';
+
+    public function testIsListable()
+    {
+        $this->expectsRequest(
+            'get',
+            '/v1/tax_codes'
+        );
+        $resources = TaxCode::all();
+        static::assertInternalType('array', $resources->data);
+        static::assertInstanceOf(\Stripe\TaxCode::class, $resources->data[0]);
+    }
+
+    public function testIsRetrievable()
+    {
+        $this->expectsRequest(
+            'get',
+            '/v1/tax_codes/' . self::TEST_RESOURCE_ID
+        );
+        $resource = TaxCode::retrieve(self::TEST_RESOURCE_ID);
+        static::assertInstanceOf(\Stripe\TaxCode::class, $resource);
+    }
+}