diff --git a/uc_tax/src/Tests/InclusiveTaxTest.php b/uc_tax/src/Tests/InclusiveTaxTest.php
index 1db2677..5552e60 100644
--- a/uc_tax/src/Tests/InclusiveTaxTest.php
+++ b/uc_tax/src/Tests/InclusiveTaxTest.php
@@ -7,17 +7,14 @@
 
 namespace Drupal\uc_tax\Tests;
 
-use Drupal\uc_store\Tests\UbercartTestBase;
-
 /**
  * Tests that inclusive taxes are calculated and displayed correctly.
  *
  * @group Ubercart
  */
-class InclusiveTaxTest extends UbercartTestBase {
+class InclusiveTaxTest extends TaxTestBase {
 
   public static $modules = ['uc_product_kit', 'uc_attribute', 'uc_cart', 'uc_payment', 'uc_payment_pack', 'uc_tax'];
-  public static $adminPermissions = [/*'administer rules', */'administer taxes'];
 
   public function testProductKitAttributes() {
     $this->drupalLogin($this->adminUser);
diff --git a/uc_tax/src/Tests/StoredTaxTest.php b/uc_tax/src/Tests/StoredTaxTest.php
index 544b071..96fbcd8 100644
--- a/uc_tax/src/Tests/StoredTaxTest.php
+++ b/uc_tax/src/Tests/StoredTaxTest.php
@@ -9,37 +9,13 @@ namespace Drupal\uc_tax\Tests;
 
 use Drupal\Component\Utility\SafeMarkup;
 use Drupal\uc_order\Entity\Order;
-use Drupal\uc_store\Tests\UbercartTestBase;
 
 /**
  * Tests that historical tax data is stored correctly, and that the proper amount is displayed.
  *
  * @group Ubercart
  */
-class StoredTaxTest extends UbercartTestBase {
-
-  public static $modules = ['uc_cart', 'uc_payment', 'uc_payment_pack', 'uc_tax'];
-  public static $adminPermissions = [/*'administer rules', */'administer taxes'];
-
-  protected function loadTaxLine($order_id) {
-    // Reset uc_order entity cache then load order.
-    \Drupal::entityManager()->getStorage('uc_order')->resetCache([$order_id]);
-    $order = Order::load($order_id);
-    foreach ($order->line_items as $line) {
-      if ($line['type'] == 'tax') {
-        return $line;
-      }
-    }
-    return FALSE;
-  }
-
-  protected function assertTaxLineCorrect($line, $rate, $when) {
-    $this->assertTrue($line, 'The tax line item was saved to the order ' . $when);
-    $this->assertTrue(number_format($rate * $this->product->price->value, 2) == number_format($line['amount'], 2), 'Stored tax line item has the correct amount ' . $when);
-    $this->assertFieldByName('line_items[' . $line['line_item_id'] . '][li_id]', $line['line_item_id'], 'Found the tax line item ID ' . $when);
-    $this->assertText($line['title'], 'Found the tax title ' . $when);
-    $this->assertText(uc_currency_format($line['amount']), 'Tax display has the correct amount ' . $when);
-  }
+class StoredTaxTest extends TaxTestBase {
 
   public function testTaxDisplay() {
     $this->drupalLogin($this->adminUser);
@@ -140,4 +116,30 @@ class StoredTaxTest extends UbercartTestBase {
     }
   }
 
+  /**
+   * Loads a tax line item from the database.
+   */
+  protected function loadTaxLine($order_id) {
+    // Reset uc_order entity cache then load order.
+    \Drupal::entityManager()->getStorage('uc_order')->resetCache([$order_id]);
+    $order = Order::load($order_id);
+    foreach ($order->line_items as $line) {
+      if ($line['type'] == 'tax') {
+        return $line;
+      }
+    }
+    return FALSE;
+  }
+
+  /**
+   * Complex assert to check various parts of the tax line item.
+   */
+  protected function assertTaxLineCorrect($line, $rate, $when) {
+    $this->assertTrue($line, 'The tax line item was saved to the order ' . $when);
+    $this->assertTrue(number_format($rate * $this->product->price->value, 2) == number_format($line['amount'], 2), 'Stored tax line item has the correct amount ' . $when);
+    $this->assertFieldByName('line_items[' . $line['line_item_id'] . '][li_id]', $line['line_item_id'], 'Found the tax line item ID ' . $when);
+    $this->assertText($line['title'], 'Found the tax title ' . $when);
+    $this->assertText(uc_currency_format($line['amount']), 'Tax display has the correct amount ' . $when);
+  }
+
 }
diff --git a/uc_tax/src/Tests/TaxTestBase.php b/uc_tax/src/Tests/TaxTestBase.php
new file mode 100644
index 0000000..9f8eeec
--- /dev/null
+++ b/uc_tax/src/Tests/TaxTestBase.php
@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\uc_tax\Tests\TaxTestBase.
+ */
+
+namespace Drupal\uc_tax\Tests;
+
+use Drupal\uc_store\Tests\UbercartTestBase;
+use Drupal\uc_tax\Entity\TaxRate;
+
+/**
+ * Provides a common set-up and utility routines for tax tests.
+ */
+abstract class TaxTestBase extends UbercartTestBase {
+
+  public static $modules = ['uc_cart', 'uc_payment', 'uc_payment_pack', 'uc_tax'];
+  public static $adminPermissions = [/*'administer rules', */'administer taxes'];
+
+  /**
+   * Defines a new tax rate.
+   *
+   * @param string $plugin_id
+   *   ID of the UbercartTaxRate plugin to use.
+   * @param array $values
+   *   Values to insert into the tax rate entity form.
+   *
+   * @return \Drupal\uc_tax\TaxRateInterface
+   *   The TaxRate entity that was created.
+   */
+  protected function createTaxRate($plugin_id, $values = []) {
+    $has_user = $this->loggedInUser;
+    if (!$has_user) {
+      $this->drupalLogin($this->adminUser);
+    }
+
+    $values += [
+      'id' => strtolower($this->randomMachineName()),
+      'label' => $this->randomString(),
+    ];
+    $this->drupalPostForm('admin/store/config/tax/add/' . $plugin_id, $values, 'Save tax rate');
+
+    if (!$has_user) {
+      $this->drupalLogout();
+    }
+
+    return TaxRate::load($values['id']);
+  }
+
+}