diff --git a/core/lib/Thelia/Config/Resources/config.xml b/core/lib/Thelia/Config/Resources/config.xml
index a5f79b8bf..9657f80e0 100755
--- a/core/lib/Thelia/Config/Resources/config.xml
+++ b/core/lib/Thelia/Config/Resources/config.xml
@@ -12,6 +12,7 @@
     </parameters>
 
     <services>
+
         <!--  URL maganement -->
         <service id="thelia.url.manager" class="Thelia\Tools\URL">
             <argument type="service" id="service_container" />
@@ -35,6 +36,13 @@
             <argument type="service" id="esi" />
             <argument type="service" id="fragment.renderer.inline" />
         </service>
+
+        <!-- Tax engine -->
+
+        <service id="thelia.taxEngine" class="Thelia\TaxEngine\TaxEngine" scope="request">
+            <argument type="service" id="request" />
+        </service>
+
 		<!--
 		A ControllerResolver that supports "a:b:c", "service:method" and class::method" notations,
 		thus allowing the definition of controllers as service (see http://symfony.com/fr/doc/current/cookbook/controller/service.html)
diff --git a/core/lib/Thelia/Config/Resources/smarty-plugin.xml b/core/lib/Thelia/Config/Resources/smarty-plugin.xml
index 8019b0688..903bb114e 100644
--- a/core/lib/Thelia/Config/Resources/smarty-plugin.xml
+++ b/core/lib/Thelia/Config/Resources/smarty-plugin.xml
@@ -79,6 +79,7 @@
             <tag name="thelia.parser.register_plugin"/>
             <argument type="service" id="request" />
             <argument type="service" id="thelia.securityContext" />
+            <argument type="service" id="thelia.taxEngine" />
             <argument type="service" id="thelia.parser.context"/>
             <argument type="service" id="event_dispatcher"/>
         </service>
diff --git a/core/lib/Thelia/Controller/Admin/TaxController.php b/core/lib/Thelia/Controller/Admin/TaxController.php
index f5c20a1bd..69824a3cd 100644
--- a/core/lib/Thelia/Controller/Admin/TaxController.php
+++ b/core/lib/Thelia/Controller/Admin/TaxController.php
@@ -29,6 +29,7 @@ use Thelia\Core\Event\TheliaEvents;
 use Thelia\Form\TaxCreationForm;
 use Thelia\Form\TaxModificationForm;
 use Thelia\Model\TaxQuery;
+use Thelia\Model\Tax;
 
 class TaxController extends AbstractCrudController
 {
@@ -49,7 +50,9 @@ class TaxController extends AbstractCrudController
 
     protected function getCreationForm()
     {
-        return new TaxCreationForm($this->getRequest());
+        $form = new TaxCreationForm($this->getRequest());
+
+        return $form;
     }
 
     protected function getUpdateForm()
@@ -64,7 +67,7 @@ class TaxController extends AbstractCrudController
         $event->setLocale($formData['locale']);
         $event->setTitle($formData['title']);
         $event->setDescription($formData['description']);
-        $event->setType($formData['type']);
+        $event->setType(Tax::unescapeTypeName($formData['type']));
         $event->setRequirements($this->getRequirements($formData['type'], $formData));
 
         return $event;
@@ -78,7 +81,7 @@ class TaxController extends AbstractCrudController
         $event->setId($formData['id']);
         $event->setTitle($formData['title']);
         $event->setDescription($formData['description']);
-        $event->setType($formData['type']);
+        $event->setType(Tax::unescapeTypeName($formData['type']));
         $event->setRequirements($this->getRequirements($formData['type'], $formData));
 
         return $event;
@@ -107,7 +110,7 @@ class TaxController extends AbstractCrudController
             'locale'       => $object->getLocale(),
             'title'        => $object->getTitle(),
             'description'  => $object->getDescription(),
-            'type'         => $object->getType(),
+            'type'         => Tax::escapeTypeName($object->getType()),
         );
 
         // Setup the object form
@@ -200,27 +203,20 @@ class TaxController extends AbstractCrudController
         );
     }
 
-    protected function checkRequirements($formData)
-    {
-        $type = $formData['type'];
-
-    }
-
     protected function getRequirements($type, $formData)
     {
         $requirements = array();
         foreach ($formData as $data => $value) {
+
             if (!strstr($data, ':')) {
                 continue;
             }
 
             $couple = explode(':', $data);
 
-            if (count($couple) != 2 || $couple[0] != $type) {
-                continue;
+            if (count($couple) == 2 && $couple[0] == $type) {
+                $requirements[$couple[1]] = $value;
             }
-
-            $requirements[$couple[1]] = $value;
         }
 
         return $requirements;
diff --git a/core/lib/Thelia/Core/Template/Loop/Cart.php b/core/lib/Thelia/Core/Template/Loop/Cart.php
index aa7d65703..2ad8ae8a2 100755
--- a/core/lib/Thelia/Core/Template/Loop/Cart.php
+++ b/core/lib/Thelia/Core/Template/Loop/Cart.php
@@ -78,7 +78,7 @@ class Cart extends BaseLoop implements ArraySearchLoopInterface
 
     public function parseResults(LoopResult $loopResult)
     {
-        $taxCountry = TaxEngine::getInstance($this->request->getSession())->getDeliveryCountry();
+        $taxCountry = $this->container->get('thelia.taxEngine')->getDeliveryCountry();
 
         foreach ($loopResult->getResultDataCollection() as $cartItem) {
             $product = $cartItem->getProduct();
diff --git a/core/lib/Thelia/Core/Template/Loop/Delivery.php b/core/lib/Thelia/Core/Template/Loop/Delivery.php
index 93c73bb17..87f00a7ec 100644
--- a/core/lib/Thelia/Core/Template/Loop/Delivery.php
+++ b/core/lib/Thelia/Core/Template/Loop/Delivery.php
@@ -60,7 +60,7 @@ class Delivery extends BaseSpecificModule
                 throw new \InvalidArgumentException('Cannot found country id: `' . $countryId . '` in delivery loop');
             }
         } else {
-            $country = TaxEngine::getInstance($this->request->getSession())->getDeliveryCountry();
+            $country = $this->container->get('thelia.taxEngine')->getDeliveryCountry();
         }
 
         foreach ($loopResult->getResultDataCollection() as $deliveryModule) {
diff --git a/core/lib/Thelia/Core/Template/Loop/Product.php b/core/lib/Thelia/Core/Template/Loop/Product.php
index 8ee347f0a..778ef8d37 100755
--- a/core/lib/Thelia/Core/Template/Loop/Product.php
+++ b/core/lib/Thelia/Core/Template/Loop/Product.php
@@ -464,7 +464,7 @@ class Product extends BaseI18nLoop implements PropelSearchLoopInterface, SearchL
             return $this->parseComplex($loopResult);
         }
 
-        $taxCountry = TaxEngine::getInstance($this->request->getSession())->getDeliveryCountry();
+        $taxCountry = $this->container->get('thelia.taxEngine')->getDeliveryCountry();
 
         foreach ($loopResult->getResultDataCollection() as $product) {
 
@@ -982,7 +982,7 @@ class Product extends BaseI18nLoop implements PropelSearchLoopInterface, SearchL
     {
         $loopResult = new LoopResult($results);
 
-        $taxCountry = TaxEngine::getInstance($this->request->getSession())->getDeliveryCountry();
+        $taxCountry = $this->container->get('thelia.taxEngine')->getDeliveryCountry();
 
         foreach ($loopResult->getResultDataCollection() as $product) {
 
diff --git a/core/lib/Thelia/Core/Template/Loop/ProductSaleElements.php b/core/lib/Thelia/Core/Template/Loop/ProductSaleElements.php
index 124f3d162..8e2aa03dd 100755
--- a/core/lib/Thelia/Core/Template/Loop/ProductSaleElements.php
+++ b/core/lib/Thelia/Core/Template/Loop/ProductSaleElements.php
@@ -145,7 +145,7 @@ class ProductSaleElements extends BaseLoop implements PropelSearchLoopInterface
 
     public function parseResults(LoopResult $loopResult)
     {
-        $taxCountry = TaxEngine::getInstance($this->request->getSession())->getDeliveryCountry();
+        $taxCountry = $this->container->get('thelia.taxEngine')->getDeliveryCountry();
 
         foreach ($loopResult->getResultDataCollection() as $PSEValue) {
             $loopResultRow = new LoopResultRow($PSEValue);
diff --git a/core/lib/Thelia/Core/Template/Loop/Tax.php b/core/lib/Thelia/Core/Template/Loop/Tax.php
index bc57f5593..40c6e1cf3 100644
--- a/core/lib/Thelia/Core/Template/Loop/Tax.php
+++ b/core/lib/Thelia/Core/Template/Loop/Tax.php
@@ -150,6 +150,7 @@ class Tax extends BaseI18nLoop implements PropelSearchLoopInterface
             $loopResultRow
                 ->set("ID"                      , $tax->getId())
                 ->set("TYPE"                    , $tax->getType())
+                ->set("ESCAPED_TYPE"            , \Thelia\Model\Tax::escapeTypeName($tax->getType()))
                 ->set("REQUIREMENTS"            , $tax->getRequirements())
                 ->set("IS_TRANSLATED"           , $tax->getVirtualColumn('IS_TRANSLATED'))
                 ->set("LOCALE"                  , $this->locale)
diff --git a/core/lib/Thelia/Core/Template/Smarty/Plugins/DataAccessFunctions.php b/core/lib/Thelia/Core/Template/Smarty/Plugins/DataAccessFunctions.php
index 236f6b8be..aa40d69df 100755
--- a/core/lib/Thelia/Core/Template/Smarty/Plugins/DataAccessFunctions.php
+++ b/core/lib/Thelia/Core/Template/Smarty/Plugins/DataAccessFunctions.php
@@ -58,15 +58,17 @@ class DataAccessFunctions extends AbstractSmartyPlugin
     protected $parserContext;
     protected $request;
     protected $dispatcher;
+    protected $taxEngine;
 
     private static $dataAccessCache = array();
 
-    public function __construct(Request $request, SecurityContext $securityContext, ParserContext $parserContext, ContainerAwareEventDispatcher $dispatcher)
+    public function __construct(Request $request, SecurityContext $securityContext, TaxEngine $taxEngine, ParserContext $parserContext, ContainerAwareEventDispatcher $dispatcher)
     {
         $this->securityContext = $securityContext;
         $this->parserContext = $parserContext;
         $this->request = $request;
         $this->dispatcher = $dispatcher;
+        $this->taxEngine = $taxEngine;
     }
 
     /**
@@ -184,7 +186,7 @@ class DataAccessFunctions extends AbstractSmartyPlugin
         if (array_key_exists('currentCountry', self::$dataAccessCache)) {
             $taxCountry = self::$dataAccessCache['currentCountry'];
         } else {
-            $taxCountry = TaxEngine::getInstance($this->request->getSession())->getDeliveryCountry();
+            $taxCountry = $this->taxEngine->getDeliveryCountry();
             self::$dataAccessCache['currentCountry'] = $taxCountry;
         }
 
@@ -378,12 +380,17 @@ class DataAccessFunctions extends AbstractSmartyPlugin
             self::$dataAccessCache['data_' . $objectLabel] = $data;
         }
 
-        $noGetterData = array();
-        foreach ($columns as $column) {
-            $noGetterData[$column] = $data->getVirtualColumn('i18n_' . $column);
+        if ($data !== null) {
+            $noGetterData = array();
+
+            foreach ($columns as $column) {
+                $noGetterData[$column] = $data->getVirtualColumn('i18n_' . $column);
+            }
+
+            return $this->dataAccess($objectLabel, $params, $data, $noGetterData);
         }
 
-        return $this->dataAccess($objectLabel, $params, $data, $noGetterData);
+        return '';
     }
 
     /**
diff --git a/core/lib/Thelia/Form/TaxCreationForm.php b/core/lib/Thelia/Form/TaxCreationForm.php
index 001bb3cf8..d92f67ba1 100644
--- a/core/lib/Thelia/Form/TaxCreationForm.php
+++ b/core/lib/Thelia/Form/TaxCreationForm.php
@@ -28,6 +28,8 @@ use Thelia\Core\Form\Type\TheliaType;
 use Thelia\Core\Translation\Translator;
 use Thelia\TaxEngine\TaxEngine;
 use Thelia\TaxEngine\TaxType;
+use Thelia\Core\HttpFoundation\Request;
+use Thelia\Model\Tax;
 
 /**
  * Class TaxCreationForm
@@ -40,14 +42,21 @@ class TaxCreationForm extends BaseForm
 
     protected function buildForm($change_mode = false)
     {
-        $types = TaxEngine::getInstance($this->getRequest()->getSession())->getTaxTypeList();
+        // FIXME : SHOULD be extracted from the container
+        $taxEngine = new TaxEngine($this->getRequest());
+
+        $types = $taxEngine->getTaxTypeList();
+
         $typeList = array();
         $requirementList = array();
-        foreach ($types as $type) {
-            $classPath = "\\Thelia\\TaxEngine\\TaxType\\$type";
-            $instance = new $classPath();
-            $typeList[$type] = $instance->getTitle();
-            $requirementList[$type] = $instance->getRequirementsList();
+
+        foreach ($types as $classname) {
+
+            $instance = new $classname();
+
+            $typeList[Tax::escapeTypeName($classname)] = $instance->getTitle();
+
+            $requirementList[$classname] = $instance->getRequirementsDefinition();
         }
 
         $this->formBuilder
@@ -65,27 +74,29 @@ class TaxCreationForm extends BaseForm
             ))
         ;
 
-        foreach ($requirementList as $type => $requirements) {
-            foreach ($requirements as $name => $requirementType) {
+        foreach ($requirementList as $name => $requirements) {
+            foreach ($requirements as $requirement) {
                 $this->formBuilder
-                    ->add($type . ':' . $name, new TheliaType(), array(
-                        //"instance" => $requirementType,
+                    // Replace the '\' in the class name by hyphens
+                    // See TaxController::getRequirements if some changes are made about this.
+                    ->add(Tax::escapeTypeName($name) . ':' . $requirement->getName(), new TheliaType(), array(
+                        //"instance" => $requirement->getType(),
                         "constraints" => array(
                             new Constraints\Callback(
                                 array(
                                     "methods" => array(
-                                        array($requirementType, "verifyForm"),
+                                        array($requirement->getType(), "verifyForm"),
                                     ),
                                 )
                             ),
                         ),
                         "attr" => array(
                             "tag" => "requirements",
-                            "tax_type" => $type,
+                            "tax_type" => Tax::escapeTypeName($name),
                         ),
-                        "label" => Translator::getInstance()->trans($name),
-                        "type" => $requirementType->getFormType(),
-                        "options" => $requirementType->getFormOptions(),
+                        "label" => Translator::getInstance()->trans($requirement->getName()),
+                        "type" => $requirement->getType()->getFormType(),
+                        "options" => $requirement->getType()->getFormOptions(),
                     ))
                 ;
             }
diff --git a/core/lib/Thelia/Model/Tax.php b/core/lib/Thelia/Model/Tax.php
index 6752129a2..f9bbd4f68 100755
--- a/core/lib/Thelia/Model/Tax.php
+++ b/core/lib/Thelia/Model/Tax.php
@@ -5,12 +5,23 @@ namespace Thelia\Model;
 use Thelia\Exception\TaxEngineException;
 use Thelia\Model\Base\Tax as BaseTax;
 use Thelia\Model\Tools\ModelEventDispatcherTrait;
-use Thelia\TaxEngine\TaxType\BaseTaxType;
+use Thelia\TaxEngine\BaseTaxType;
 
 class Tax extends BaseTax
 {
     use ModelEventDispatcherTrait;
 
+    /**
+     * Provides a form-and-javascript-safe version of the type, which is a fully qualified classname, with \
+     */
+    public static function escapeTypeName($name) {
+        return str_replace('\\', '-', $name);
+    }
+
+    public static function unescapeTypeName($name) {
+        return str_replace('-', '\\', $name);
+    }
+
     public function calculateTax($amount)
     {
         if(false === filter_var($amount, FILTER_VALIDATE_FLOAT)) {
@@ -39,7 +50,7 @@ class Tax extends BaseTax
 
     public function getTypeInstance()
     {
-        $class = '\\Thelia\\TaxEngine\\TaxType\\' . $this->getType();
+        $class = $this->getType();
 
         /* test type */
         if(!class_exists($class)) {
diff --git a/core/lib/Thelia/TaxEngine/TaxType/BaseTaxType.php b/core/lib/Thelia/TaxEngine/BaseTaxType.php
similarity index 54%
rename from core/lib/Thelia/TaxEngine/TaxType/BaseTaxType.php
rename to core/lib/Thelia/TaxEngine/BaseTaxType.php
index e5dd69a06..8df875e8f 100755
--- a/core/lib/Thelia/TaxEngine/TaxType/BaseTaxType.php
+++ b/core/lib/Thelia/TaxEngine/BaseTaxType.php
@@ -20,7 +20,7 @@
 /*	    along with this program. If not, see <http://www.gnu.org/licenses/>.         */
 /*                                                                                   */
 /*************************************************************************************/
-namespace Thelia\TaxEngine\TaxType;
+namespace Thelia\TaxEngine;
 
 use Thelia\Exception\TaxEngineException;
 use Thelia\Model\Product;
@@ -33,14 +33,54 @@ use Thelia\Type\TypeInterface;
  */
 abstract class BaseTaxType
 {
-    protected $requirements = null;
+    /**
+     * A var <-> value array which contains TaxtType requirements (e.g. parameters)
+     *
+     * @var array
+     */
+    protected $requirements = array();
 
-    abstract public function pricePercentRetriever();
+    /**
+     * For a price percent tax type, return the percentage (e.g. 20 for 20%) of the product price
+     * to use in tax calculation.
+     *
+     * For other tax types, this method shoud return 0.
+     *
+     * @return number
+     */
+    public function pricePercentRetriever() {
+        return 0;
+    }
 
-    abstract public function fixAmountRetriever(Product $product);
+    /**
+     * For constant amount tax type, return the absolute amount to use in tax calculation.
+     *
+     * For other tax types, this method shoud return 0.
+     *
+     * @return number
+     */
+    public function fixAmountRetriever(Product $product) {
+        return 0;
+    }
 
-    abstract public function getRequirementsList();
+    /**
+     * Returns the requirements definition of this tax type. This is an array of
+     * TaxTypeRequirementDefinition, which defines the name and the type of
+     * the requirements. Example :
+     *
+     * array(
+     *    'percent' => new FloatType()
+     * );
+     *
+     * @return array of TaxTypeRequirementDefinition
+     */
+    public function getRequirementsDefinition() {
+        return array();
+    }
 
+    /**
+     * @return the name of this tax type.
+     */
     abstract public function getTitle();
 
     public function calculate(Product $product, $untaxedPrice)
@@ -48,41 +88,50 @@ abstract class BaseTaxType
         return $untaxedPrice * $this->pricePercentRetriever() + $this->fixAmountRetriever($product);
     }
 
+    /**
+     * @throws TaxEngineException
+     * @return array Return the requirements array.
+     */
+    public function getRequirements() {
+        return $this->requirements;
+    }
+
     public function loadRequirements($requirementsValues)
     {
-        $this->requirements = $this->getRequirementsList();
+        $requirements = $this->getRequirementsDefinition();
 
-        if (!is_array($this->requirements)) {
-            throw new TaxEngineException('getRequirementsList must return an array', TaxEngineException::TAX_TYPE_BAD_ABSTRACT_METHOD);
+        if (!is_array($requirements)) {
+            throw new TaxEngineException('getRequirementsDefinition must return an array', TaxEngineException::TAX_TYPE_BAD_ABSTRACT_METHOD);
         }
 
-        foreach ($this->requirements as $requirement => $requirementType) {
-            if (!$requirementType instanceof TypeInterface) {
-                throw new TaxEngineException('getRequirementsList must return an array of TypeInterface', TaxEngineException::TAX_TYPE_BAD_ABSTRACT_METHOD);
+        foreach ($requirements as $requirement) {
+
+            $requirementName = $requirement->getName();
+
+            if (! array_key_exists($requirementName, $requirementsValues)) {
+                throw new TaxEngineException('Cannot load requirements : requirement value for `' . $requirementName . '` not found', TaxEngineException::TAX_TYPE_REQUIREMENT_NOT_FOUND);
             }
 
-            if (!array_key_exists($requirement, $requirementsValues)) {
-                throw new TaxEngineException('Cannot load requirements : requirement value for `' . $requirement . '` not found', TaxEngineException::TAX_TYPE_REQUIREMENT_NOT_FOUND);
+            if (! $requirement->isValueValid($requirementsValues[$requirementName])) {
+                throw new TaxEngineException('Requirement value for `' . $requirementName . '` does not match required type', TaxEngineException::TAX_TYPE_BAD_REQUIREMENT_VALUE);
             }
 
-            if (!$requirementType->isValid($requirementsValues[$requirement])) {
-                throw new TaxEngineException('Requirement value for `' . $requirement . '` does not match required type', TaxEngineException::TAX_TYPE_BAD_REQUIREMENT_VALUE);
-            }
-
-            $this->requirements[$requirement] = $requirementsValues[$requirement];
+            $this->requirements[$requirementName] = $requirementsValues[$requirementName];
         }
     }
 
+    public function setRequirement($key, $value) {
+        $this->requirements[$key] = $value;
+
+        return $this;
+    }
+
     public function getRequirement($key)
     {
-        if ($this->requirements === null) {
-            throw new TaxEngineException('Requirements are empty in BaseTaxType::getRequirement', TaxEngineException::UNDEFINED_REQUIREMENTS);
-        }
-
         if (!array_key_exists($key, $this->requirements)) {
             throw new TaxEngineException('Requirement value for `' . $key . '` does not exists in BaseTaxType::$requirements', TaxEngineException::UNDEFINED_REQUIREMENT_VALUE);
         }
 
         return $this->requirements[$key];
     }
-}
+}
\ No newline at end of file
diff --git a/core/lib/Thelia/TaxEngine/TaxEngine.php b/core/lib/Thelia/TaxEngine/TaxEngine.php
index f14db2205..2ec0df27a 100755
--- a/core/lib/Thelia/TaxEngine/TaxEngine.php
+++ b/core/lib/Thelia/TaxEngine/TaxEngine.php
@@ -25,74 +25,94 @@ namespace Thelia\TaxEngine;
 use Symfony\Component\HttpFoundation\Session\Session;
 use Thelia\Model\AddressQuery;
 use Thelia\Model\CountryQuery;
+use Thelia\Core\HttpFoundation\Request;
 
 /**
  * Class TaxEngine
+ *
  * @package Thelia\TaxEngine
  * @author Etienne Roudeix <eroudeix@openstudio.fr>
  */
 class TaxEngine
 {
-    protected static $instance = null;
+    protected $taxCountry = null;
+    protected $typeList = null;
 
-    protected static $taxCountry = null;
+    protected $taxTypesDirectories = array();
 
     /**
      * @var Session $session
      */
     protected $session = null;
 
-    public static function getInstance(Session $session = null)
+    public function __construct(Request $request)
     {
-        if (null === self::$instance) {
-            self::$instance = new TaxEngine();
-        }
+        $this->session = $request->getSession();
 
-        if (null !== self::$instance) {
-            self::$instance->setSession($session);
-        }
-
-        return self::$instance;
+        // Intialize the defaults Tax Types
+        $this->taxTypesDirectories['Thelia\\TaxEngine\\TaxType'] = __DIR__ . DS . "TaxType";
     }
 
-    protected function setSession(Session $session)
-    {
-        $this->session = $session;
+    /**
+     * Add a directroy which contains tax types classes. The tax engine
+     * will scan this directory, and add all the tax type classes.
+     *
+     * @param unknown $namespace the namespace of the classes in the directory
+     * @param unknown $path_to_tax_type_classes the path to the directory
+     */
+    public function addTaxTypeDirectory($namespace, $path_to_tax_type_classes) {
+        $this->taxTypesDirectories[$namespace] = $path_to_tax_type_classes;
     }
 
-    private function getTaxTypeDirectory()
-    {
-        return __DIR__ . "/TaxType";
+    /**
+     * Add a tax type to the current list.
+     *
+     * @param unknown $fullyQualifiedclassName the fully qualified classname, su chas MyTaxes\Taxes\MyTaxType
+     *
+     */
+    public function addTaxType($fullyQualifiedclassName) {
+        $this->typeList[] = $fullyQualifiedclassName;
     }
 
     public function getTaxTypeList()
     {
-        $typeList = array();
+        if ($this->typeList === null) {
 
-        try {
-            $directoryBrowser = new \DirectoryIterator($this->getTaxTypeDirectory($this->getTaxTypeDirectory()));
-        } catch (\UnexpectedValueException $e) {
-            return $typeList;
+            $this->typeList = array();
+
+            foreach($this->taxTypesDirectories as $namespace => $directory) {
+
+                try {
+                    $directoryIterator = new \DirectoryIterator($directory);
+
+                    foreach ($directoryIterator as $fileinfo) {
+
+                        if ($fileinfo->isFile()) {
+
+                            $fileName  = $fileinfo->getFilename();
+                            $className = substr($fileName, 0, (1+strlen($fileinfo->getExtension())) * -1);
+
+                            try {
+                                $fullyQualifiedClassName = "$namespace\\$className";
+
+                                $instance = new $fullyQualifiedClassName;
+
+                                if ($instance instanceof BaseTaxType) {
+                                    $this->addTaxType(get_class($instance));
+                                }
+                            }
+                            catch (\Exception $ex) {
+                                // Nothing special to do
+                            }
+                        }
+                    }
+                } catch (\UnexpectedValueException $e) {
+                    // Nothing special to do
+                }
+            }
         }
 
-        /* browse the directory */
-        foreach ($directoryBrowser as $directoryContent) {
-            /* is it a file ? */
-            if (!$directoryContent->isFile()) {
-                continue;
-            }
-
-            $fileName = $directoryContent->getFilename();
-            $className = substr($fileName, 0, (1+strlen($directoryContent->getExtension())) * -1);
-
-            if ($className == "BaseTaxType") {
-                continue;
-            }
-
-            $typeList[] = $className;
-        }
-
-        return $typeList;
+        return $this->typeList;
     }
 
     /**
@@ -100,30 +120,30 @@ class TaxEngine
      * First look for a picked delivery address country
      * Then look at the current customer default address country
      * Else look at the default website country
-     *
-     * @param  bool           $force result is static cached ; even if a below parameter change between 2 calls, we need to keep coherent results. but you can force it.
+
      * @return null|TaxEngine
      */
-    public function getDeliveryCountry($force = false)
+    public function getDeliveryCountry()
     {
-        if (false === $force || null === self::$taxCountry) {
+        if (null === $this->taxCountry) {
+
             /* is there a logged in customer ? */
             if (null !== $customer = $this->session->getCustomerUser()) {
                 if (null !== $this->session->getOrder()
                         && null !== $this->session->getOrder()->chosenDeliveryAddress
                         && null !== $currentDeliveryAddress = AddressQuery::create()->findPk($this->session->getOrder()->chosenDeliveryAddress)) {
-                    $taxCountry = $currentDeliveryAddress->getCountry();
+                    $this->taxCountry = $currentDeliveryAddress->getCountry();
                 } else {
                     $customerDefaultAddress = $customer->getDefaultAddress();
-                    $taxCountry = $customerDefaultAddress->getCountry();
+                    $this->taxCountry = $customerDefaultAddress->getCountry();
                 }
-            } else {
-                $taxCountry = CountryQuery::create()->findOneByByDefault(1);
             }
 
-            self::$taxCountry = $taxCountry;
+            if (null == $this->taxCountry) {
+                $this->taxCountry = CountryQuery::create()->findOneByByDefault(1);
+            }
         }
 
-        return self::$taxCountry;
+        return $this->taxCountry;
     }
-}
+}
\ No newline at end of file
diff --git a/core/lib/Thelia/TaxEngine/TaxType/FeatureFixAmountTaxType.php b/core/lib/Thelia/TaxEngine/TaxType/FeatureFixAmountTaxType.php
index baae41055..8f967018a 100755
--- a/core/lib/Thelia/TaxEngine/TaxType/FeatureFixAmountTaxType.php
+++ b/core/lib/Thelia/TaxEngine/TaxType/FeatureFixAmountTaxType.php
@@ -27,6 +27,9 @@ use Thelia\Model\FeatureProductQuery;
 use Thelia\Model\Product;
 use Thelia\Type\FloatType;
 use Thelia\Type\ModelValidIdType;
+use Thelia\Core\Translation\Translator;
+use Thelia\TaxEngine\BaseTaxType;
+use Thelia\TaxEngine\TaxTypeRequirementDefinition;
 
 /**
  *
@@ -35,9 +38,10 @@ use Thelia\Type\ModelValidIdType;
  */
 class FeatureFixAmountTaxType extends BaseTaxType
 {
-    public function pricePercentRetriever()
-    {
-        return 0;
+    public function setFeature($featureId) {
+        $this->setRequirement('feature', $featureId);
+
+        return $this;
     }
 
     public function fixAmountRetriever(Product $product)
@@ -53,21 +57,24 @@ class FeatureFixAmountTaxType extends BaseTaxType
 
         $testInt = new FloatType();
         if (!$testInt->isValid($taxAmount)) {
-            throw new TaxEngineException('Feature value does not match FLOAT format', TaxEngineException::FEATURE_BAD_EXPECTED_VALUE);
+            throw new TaxEngineException(
+                    Translator::getInstance()->trans('Feature value does not match FLOAT format'),
+                    TaxEngineException::FEATURE_BAD_EXPECTED_VALUE
+            );
         }
 
         return $taxAmount;
     }
 
-    public function getRequirementsList()
+    public function getRequirementsDefinition()
     {
         return array(
-            'feature' => new ModelValidIdType('Feature'),
+            new TaxTypeRequirementDefinition('feature', new ModelValidIdType('Feature'))
         );
     }
 
     public function getTitle()
     {
-        return "Fix amount Tax depending on a feature";
+        return Translator::getInstance()->trans("Constant amount found in one of the product's feature");
     }
 }
diff --git a/core/lib/Thelia/TaxEngine/TaxType/FixAmountTaxType.php b/core/lib/Thelia/TaxEngine/TaxType/FixAmountTaxType.php
index c93715571..40a7393ff 100755
--- a/core/lib/Thelia/TaxEngine/TaxType/FixAmountTaxType.php
+++ b/core/lib/Thelia/TaxEngine/TaxType/FixAmountTaxType.php
@@ -23,6 +23,9 @@
 namespace Thelia\TaxEngine\TaxType;
 
 use Thelia\Type\FloatType;
+use Thelia\Core\Translation\Translator;
+use Thelia\TaxEngine\BaseTaxType;
+use Thelia\TaxEngine\TaxTypeRequirementDefinition;
 
 /**
  *
@@ -31,9 +34,10 @@ use Thelia\Type\FloatType;
  */
 class FixAmountTaxType extends BaseTaxType
 {
-    public function pricePercentRetriever()
-    {
-        return 0;
+    public function setAmount($amount) {
+        $this->setRequirement('amount', $amount);
+
+        return $this;
     }
 
     public function fixAmountRetriever(\Thelia\Model\Product $product)
@@ -41,15 +45,15 @@ class FixAmountTaxType extends BaseTaxType
         return $this->getRequirement("amount");
     }
 
-    public function getRequirementsList()
+    public function getRequirementsDefinition()
     {
         return array(
-            'amount' => new FloatType(),
+            new TaxTypeRequirementDefinition('amount', new FloatType())
         );
     }
 
     public function getTitle()
     {
-        return "Fix amount Tax";
+        return Translator::getInstance()->trans("Constant amount");
     }
 }
diff --git a/core/lib/Thelia/TaxEngine/TaxType/PricePercentTaxType.php b/core/lib/Thelia/TaxEngine/TaxType/PricePercentTaxType.php
index 6881b0288..6eff7f197 100755
--- a/core/lib/Thelia/TaxEngine/TaxType/PricePercentTaxType.php
+++ b/core/lib/Thelia/TaxEngine/TaxType/PricePercentTaxType.php
@@ -23,6 +23,9 @@
 namespace Thelia\TaxEngine\TaxType;
 
 use Thelia\Type\FloatType;
+use Thelia\Core\Translation\Translator;
+use Thelia\TaxEngine\TaxTypeRequirementDefinition;
+use Thelia\TaxEngine\BaseTaxType;
 
 /**
  *
@@ -31,25 +34,26 @@ use Thelia\Type\FloatType;
  */
 class PricePercentTaxType extends BaseTaxType
 {
+    public function setPercentage($percent) {
+        $this->setRequirement('percent', $percent);
+
+        return $this;
+    }
+
     public function pricePercentRetriever()
     {
         return ($this->getRequirement("percent") * 0.01);
     }
 
-    public function fixAmountRetriever(\Thelia\Model\Product $product)
-    {
-        return 0;
-    }
-
-    public function getRequirementsList()
+    public function getRequirementsDefinition()
     {
         return array(
-            'percent' => new FloatType(),
+            new TaxTypeRequirementDefinition('percent', new FloatType())
         );
     }
 
     public function getTitle()
     {
-        return "Price % Tax";
+        return Translator::getInstance()->trans("Percentage of the product price");
     }
 }
diff --git a/core/lib/Thelia/TaxEngine/TaxTypeRequirementDefinition.php b/core/lib/Thelia/TaxEngine/TaxTypeRequirementDefinition.php
new file mode 100644
index 000000000..ca6c31efa
--- /dev/null
+++ b/core/lib/Thelia/TaxEngine/TaxTypeRequirementDefinition.php
@@ -0,0 +1,69 @@
+<?php
+/*************************************************************************************/
+/*                                                                                   */
+/*      Thelia	                                                                     */
+/*                                                                                   */
+/*      Copyright (c) OpenStudio                                                     */
+/*      email : info@thelia.net                                                      */
+/*      web : http://www.thelia.net                                                  */
+/*                                                                                   */
+/*      This program is free software; you can redistribute it and/or modify         */
+/*      it under the terms of the GNU General Public License as published by         */
+/*      the Free Software Foundation; either version 3 of the License                */
+/*                                                                                   */
+/*      This program is distributed in the hope that it will be useful,              */
+/*      but WITHOUT ANY WARRANTY; without even the implied warranty of               */
+/*      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                */
+/*      GNU General Public License for more details.                                 */
+/*                                                                                   */
+/*      You should have received a copy of the GNU General Public License            */
+/*	    along with this program. If not, see <http://www.gnu.org/licenses/>.         */
+/*                                                                                   */
+/*************************************************************************************/
+namespace Thelia\TaxEngine;
+
+use Thelia\Type\TypeInterface;
+
+/**
+ * This class defines a Tax type requirement
+ *
+ * @author Franck Allimant <franck@cqfdev.fr>
+ */
+class TaxTypeRequirementDefinition
+{
+    /**
+     * @var string The requirement name
+     */
+    protected $name;
+
+    /**
+     * @var TypeInterface The requirement type
+     */
+    protected $type;
+
+    /**
+     * Create a new Tax type requirement
+     *
+     * @param string $name the name of the requirement
+     * @param TypeInterface $type the type of the data
+     */
+    public function __construct($name, TypeInterface $type)
+    {
+        $this->name = $name;
+        $this->type = $type;
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function getType()
+    {
+        return $this->type;
+    }
+
+    public function isValueValid($value) {
+        return $this->type->isValid($value);
+    }
+}
diff --git a/core/lib/Thelia/Tests/Core/Template/Element/BaseLoopTestor.php b/core/lib/Thelia/Tests/Core/Template/Element/BaseLoopTestor.php
index 056a14927..1faa8ec81 100755
--- a/core/lib/Thelia/Tests/Core/Template/Element/BaseLoopTestor.php
+++ b/core/lib/Thelia/Tests/Core/Template/Element/BaseLoopTestor.php
@@ -30,6 +30,7 @@ use Thelia\Core\Security\SecurityContext;
 use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
 use Thelia\Core\HttpFoundation\Session\Session;
 use Thelia\Tools\URL;
+use Thelia\TaxEngine\TaxEngine;
 
 /**
  *
@@ -108,6 +109,7 @@ abstract class BaseLoopTestor extends \PHPUnit_Framework_TestCase
         $this->container->set('thelia.securityContext', new SecurityContext($request));
         $this->container->set('router.admin', $stubRouterAdmin);
         $this->container->set('thelia.url.manager', new URL($this->container));
+        $this->container->set('thelia.taxEngine', new TaxEngine($request));
 
         $this->instance = $this->getTestedInstance();
         $this->instance->initializeArgs($this->getMandatoryArguments());
diff --git a/core/lib/Thelia/Tests/TaxEngine/CalculatorTest.php b/core/lib/Thelia/Tests/TaxEngine/CalculatorTest.php
index 1e6f6f258..4a3b7e80e 100755
--- a/core/lib/Thelia/Tests/TaxEngine/CalculatorTest.php
+++ b/core/lib/Thelia/Tests/TaxEngine/CalculatorTest.php
@@ -190,25 +190,25 @@ class CalculatorTest extends \PHPUnit_Framework_TestCase
         $taxRulesCollection->setModel('\Thelia\Model\Tax');
 
         $tax = new Tax();
-        $tax->setType('PricePercentTaxType')
+        $tax->setType('\Thelia\TaxEngine\TaxType\PricePercentTaxType')
             ->setRequirements(array('percent' => 10))
             ->setVirtualColumn('taxRuleCountryPosition', 1);
         $taxRulesCollection->append($tax);
 
         $tax = new Tax();
-        $tax->setType('PricePercentTaxType')
+        $tax->setType('\Thelia\TaxEngine\TaxType\PricePercentTaxType')
             ->setRequirements(array('percent' => 8))
             ->setVirtualColumn('taxRuleCountryPosition', 1);
         $taxRulesCollection->append($tax);
 
         $tax = new Tax();
-        $tax->setType('FixAmountTaxType')
+        $tax->setType('\Thelia\TaxEngine\TaxType\FixAmountTaxType')
             ->setRequirements(array('amount' => 5))
             ->setVirtualColumn('taxRuleCountryPosition', 2);
         $taxRulesCollection->append($tax);
 
         $tax = new Tax();
-        $tax->setType('PricePercentTaxType')
+        $tax->setType('\Thelia\TaxEngine\TaxType\PricePercentTaxType')
             ->setRequirements(array('percent' => 1))
             ->setVirtualColumn('taxRuleCountryPosition', 3);
         $taxRulesCollection->append($tax);
@@ -246,25 +246,25 @@ class CalculatorTest extends \PHPUnit_Framework_TestCase
         $taxRulesCollection->setModel('\Thelia\Model\Tax');
 
         $tax = new Tax();
-        $tax->setType('PricePercentTaxType')
+        $tax->setType('\Thelia\TaxEngine\TaxType\PricePercentTaxType')
             ->setRequirements(array('percent' => 10))
             ->setVirtualColumn('taxRuleCountryPosition', 1);
         $taxRulesCollection->append($tax);
 
         $tax = new Tax();
-        $tax->setType('PricePercentTaxType')
+        $tax->setType('\Thelia\TaxEngine\TaxType\PricePercentTaxType')
             ->setRequirements(array('percent' => 8))
             ->setVirtualColumn('taxRuleCountryPosition', 1);
         $taxRulesCollection->append($tax);
 
         $tax = new Tax();
-        $tax->setType('FixAmountTaxType')
+        $tax->setType('\Thelia\TaxEngine\TaxType\FixAmountTaxType')
             ->setRequirements(array('amount' => 5))
             ->setVirtualColumn('taxRuleCountryPosition', 2);
         $taxRulesCollection->append($tax);
 
         $tax = new Tax();
-        $tax->setType('PricePercentTaxType')
+        $tax->setType('\Thelia\TaxEngine\TaxType\PricePercentTaxType')
             ->setRequirements(array('percent' => 1))
             ->setVirtualColumn('taxRuleCountryPosition', 3);
         $taxRulesCollection->append($tax);
diff --git a/core/lib/Thelia/Tests/TaxEngine/TaxEngineTest.php b/core/lib/Thelia/Tests/TaxEngine/TaxEngineTest.php
new file mode 100644
index 000000000..ef243c836
--- /dev/null
+++ b/core/lib/Thelia/Tests/TaxEngine/TaxEngineTest.php
@@ -0,0 +1,61 @@
+<?php
+use Thelia\TaxEngine\TaxEngine;
+/*************************************************************************************/
+/*                                                                                   */
+/*      Thelia	                                                                     */
+/*                                                                                   */
+/*      Copyright (c) OpenStudio                                                     */
+/*      email : info@thelia.net                                                      */
+/*      web : http://www.thelia.net                                                  */
+/*                                                                                   */
+/*      This program is free software; you can redistribute it and/or modify         */
+/*      it under the terms of the GNU General Public License as published by         */
+/*      the Free Software Foundation; either version 3 of the License                */
+/*                                                                                   */
+/*      This program is distributed in the hope that it will be useful,              */
+/*      but WITHOUT ANY WARRANTY; without even the implied warranty of               */
+/*      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                */
+/*      GNU General Public License for more details.                                 */
+/*                                                                                   */
+/*      You should have received a copy of the GNU General Public License            */
+/*	    along with this program. If not, see <http://www.gnu.org/licenses/>.         */
+/*                                                                                   */
+/*************************************************************************************/
+
+namespace Thelia\Tests\TaxEngine;
+
+use Thelia\Core\HttpFoundation\Request;
+use Thelia\Core\HttpFoundation\Session\Session;
+use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
+use Thelia\TaxEngine\TaxEngine;
+
+
+/**
+ *
+ * @author Franck Allimant <franck@cqfdev.fr>
+ *
+ */
+class TaxEngineTest extends \PHPUnit_Framework_TestCase
+{
+    protected $request;
+
+    public function setUp()
+    {
+        $this->request = new Request();
+
+        $this->request->setSession(new Session(new MockArraySessionStorage()));
+    }
+
+    /**
+      */
+    public function testGetTaxTypeList()
+    {
+        $taxEngine = new TaxEngine($this->request);
+
+        $list = $taxEngine->getTaxTypeList();
+
+        $this->assertEquals($list[0], "Thelia\TaxEngine\TaxType\FeatureFixAmountTaxType");
+        $this->assertEquals($list[1], "Thelia\TaxEngine\TaxType\FixAmountTaxType");
+        $this->assertEquals($list[2], "Thelia\TaxEngine\TaxType\PricePercentTaxType");
+    }
+}
\ No newline at end of file
diff --git a/install/insert.sql b/install/insert.sql
index a144deddb..61b3e9045 100755
--- a/install/insert.sql
+++ b/install/insert.sql
@@ -1193,8 +1193,8 @@ INSERT INTO `country_i18n` (`id`, `locale`, `title`, `description`, `chapo`, `po
 
 INSERT INTO  `tax` (`id`, `type`, `serialized_requirements`, `created_at`, `updated_at`)
   VALUES
-  (1, 'PricePercentTaxType', 'eyJwZXJjZW50IjoiMjAifQ==', NOW(), NOW()),
-  (2, 'PricePercentTaxType', 'eyJwZXJjZW50IjoiMTAifQ==', NOW(), NOW());
+  (1, 'Thelia\\TaxEngine\\TaxType\\PricePercentTaxType', 'eyJwZXJjZW50IjoiMjAifQ==', NOW(), NOW()),
+  (2, 'Thelia\\TaxEngine\\TaxType\\PricePercentTaxType', 'eyJwZXJjZW50IjoiMTAifQ==', NOW(), NOW());
 
 INSERT INTO `tax_i18n` (`id`, `locale`, `title`)
   VALUES
diff --git a/templates/backOffice/default/includes/module-block.html b/templates/backOffice/default/includes/module-block.html
index 2127263b2..91ae6086d 100755
--- a/templates/backOffice/default/includes/module-block.html
+++ b/templates/backOffice/default/includes/module-block.html
@@ -6,6 +6,16 @@
             </caption>
             <thead>
             <tr>
+                <th>
+                {admin_sortable_header
+                   current_order=$module_order
+                   order='id'
+                   reverse_order='id_reverse'
+                   path={url path='/admin/modules'}
+                   request_parameter_name='module_order'
+                   label="{intl l='ID'}"
+                }
+                </th>
                 <th>
                 {admin_sortable_header
                    current_order=$module_order
@@ -70,6 +80,7 @@
             <tbody>
             {loop type="module" name="module.{$module_type}" module_type={$module_type|default:1} order=$module_order backend_context=1}
                 <tr>
+                    <td>{$ID}</td>
                     <td>{$TITLE}</td>
                     <td>{$CODE}</td>
                     <td>{$CHAPO}</td>
@@ -103,7 +114,7 @@
 
                     <td class="text-right">
                         <div class="btn-group">
-                            {if $CONFIGURABLE == 1}
+                            C:{if $CONFIGURABLE == 1}1
                                 {loop type="auth" name="can_change" role="ADMIN" module=$CODE access="VIEW"}
                                     <a class="{if ! $ACTIVE}disabled {/if} btn btn-primary btn-xs" id="config-btn-{$ID}" title="{intl l='Configure this module'}" href="{url path="/admin/module/$CODE"}">{intl l="Configure"}</a>
                                 {/loop}
diff --git a/templates/backOffice/default/tax-edit.html b/templates/backOffice/default/tax-edit.html
index 4e77024ac..de2d39d1b 100755
--- a/templates/backOffice/default/tax-edit.html
+++ b/templates/backOffice/default/tax-edit.html
@@ -79,7 +79,7 @@
                             <div class="form-group">
                                 <select name="{$name}" class="js-change-tax-type" data-toggle="selectpicker">
                                     {foreach $choices as $choice}
-                                        <option value="{$choice->value}" {if !$form_error && $choice->value == $TYPE || $form_error && $choice->value == $value}selected="selected" {/if}>{$choice->label}</option>
+                                        <option value="{$choice->value}" {if !$form_error && $choice->value == $ESCAPED_TYPE || $form_error && $choice->value == $value}selected="selected" {/if}>{$choice->label}</option>
                                     {/foreach}
                                 </select>
                             </div>
@@ -89,19 +89,19 @@
                     {/form_field}
 
                     {form_tagged_fields form=$form tag='requirements'}
-                        <div class="form-group {if $error}has-error{/if} js-tax-requirements" data-tax-type="{$attr_list.tax_type}" {if !$form_error && $attr_list.tax_type != $TYPE || $form_error && $attr_list.tax_type != $typeValue}style="display: none"{/if}>
+                        <div class="form-group {if $error}has-error{/if} js-tax-requirements" data-tax-type="{$attr_list.tax_type}" {if !$form_error && $attr_list.tax_type != $ESCAPED_TYPE || $form_error && $attr_list.tax_type != $typeValue}style="display: none"{/if}>
                             <label for="{$label_attr.for}" class="control-label">
                                 {intl l=$label}
                             </label>
                             {if $formType == 'choice'}
-                                <select name="{$name}" data-toggle="selectpicker" {if !$form_error && $attr_list.tax_type != $TYPE || $form_error && $attr_list.tax_type != $typeValue}disabled="disabled"{/if}>
+                                <select name="{$name}" data-toggle="selectpicker" {if !$form_error && $attr_list.tax_type != $ESCAPED_TYPE || $form_error && $attr_list.tax_type != $typeValue}disabled="disabled"{/if}>
                                     {foreach $choices as $choice}
                                         <option value="{$choice->value}" {if !$form_error && $REQUIREMENTS.$label == $choice->value || $form_error && $value == $choice->value}selected="selected" {/if}>{$choice->label}</option>
                                     {/foreach}
                                 </select>
                             {/if}
                             {if $formType == 'text'}
-                                <input type="text" {if !$form_error && $attr_list.tax_type != $TYPE || $form_error && $attr_list.tax_type != $typeValue}disabled="disabled"{/if} id="{$label_attr.for}" name="{$name}" required="required" class="form-control" value="{if $form_error}{$value}{else}{$REQUIREMENTS.$label}{/if}">
+                                <input type="text" {if !$form_error && $attr_list.tax_type != $ESCAPED_TYPE || $form_error && $attr_list.tax_type != $typeValue}disabled="disabled"{/if} id="{$label_attr.for}" name="{$name}" required="required" class="form-control" value="{if $form_error}{$value}{else}{$REQUIREMENTS.$label}{/if}">
                             {/if}
                         </div>
                     {/form_tagged_fields}