diff --git a/core/lib/Thelia/Model/Tax.php b/core/lib/Thelia/Model/Tax.php
index 738f16508..7b9b22b6f 100755
--- a/core/lib/Thelia/Model/Tax.php
+++ b/core/lib/Thelia/Model/Tax.php
@@ -40,13 +40,13 @@ class Tax extends BaseTax
 
         /* test type */
         if(!class_exists($class)) {
-            throw new TaxEngineException('Recorded type does not exists', TaxEngineException::BAD_RECORDED_TYPE);
+            throw new TaxEngineException('Recorded type `' . $class . '` does not exists', TaxEngineException::BAD_RECORDED_TYPE);
         }
 
         $instance = new $class;
 
         if(!$instance instanceof BaseTaxType) {
-            throw new TaxEngineException('Recorded type does not extends BaseTaxType', TaxEngineException::BAD_RECORDED_TYPE);
+            throw new TaxEngineException('Recorded type `' . $class . '` does not extends BaseTaxType', TaxEngineException::BAD_RECORDED_TYPE);
         }
 
         return $instance;
@@ -54,7 +54,7 @@ class Tax extends BaseTax
 
     public function setRequirements($requirements)
     {
-        parent::setSerializedRequirements(base64_encode(json_encode($requirements)));
+        return parent::setSerializedRequirements(base64_encode(json_encode($requirements)));
     }
 
     public function getRequirements()
diff --git a/core/lib/Thelia/TaxEngine/Calculator.php b/core/lib/Thelia/TaxEngine/Calculator.php
index 2708e88c6..f49498263 100755
--- a/core/lib/Thelia/TaxEngine/Calculator.php
+++ b/core/lib/Thelia/TaxEngine/Calculator.php
@@ -39,6 +39,9 @@ class Calculator
      */
     protected $taxRuleQuery = null;
 
+    /**
+     * @var null|\Propel\Runtime\Collection\ObjectCollection
+     */
     protected $taxRulesCollection = null;
 
     protected $product = null;
@@ -80,19 +83,28 @@ class Calculator
             throw new TaxEngineException('BAD AMOUNT FORMAT', TaxEngineException::BAD_AMOUNT_FORMAT);
         }
 
-        $totalTaxAmount = 0;
+        $taxedPrice = $untaxedPrice;
+        $currentPosition = 1;
+        $currentTax = 0;
+
         foreach($this->taxRulesCollection as $taxRule) {
+            $position = (int)$taxRule->getTaxRuleCountryPosition();
+
             $taxType = $taxRule->getTypeInstance();
+            $taxType->loadRequirements( $taxRule->getRequirements() );
 
-            $taxType->loadRequirements($taxRule->getRequirements());
+            if($currentPosition !== $position) {
+                $taxedPrice += $currentTax;
+                $currentTax = 0;
+                $currentPosition = $position;
+            }
 
-            $taxAmount = $taxType->calculate($untaxedPrice);
-
-            $totalTaxAmount += $taxAmount;
-            $untaxedPrice += $taxAmount;
+            $currentTax += $taxType->calculate($taxedPrice);
         }
 
-        return $totalTaxAmount;
+        $taxedPrice += $currentTax;
+
+        return $taxedPrice;
     }
 
     public function getTaxedPrice($untaxedPrice)
diff --git a/core/lib/Thelia/TaxEngine/TaxType/FixAmountTaxType.php b/core/lib/Thelia/TaxEngine/TaxType/FixAmountTaxType.php
new file mode 100755
index 000000000..c533d0ec3
--- /dev/null
+++ b/core/lib/Thelia/TaxEngine/TaxType/FixAmountTaxType.php
@@ -0,0 +1,45 @@
+<?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\TaxType;
+
+use Thelia\Type\FloatType;
+
+/**
+ *
+ * @author Etienne Roudeix <eroudeix@openstudio.fr>
+ *
+ */
+class FixAmountTaxType extends BaseTaxType
+{
+    public function calculate($untaxedPrice)
+    {
+        return $this->getRequirement("amount");
+    }
+
+    public function getRequirementsList()
+    {
+        return array(
+            'amount' => new FloatType(),
+        );
+    }
+}
diff --git a/install/tax_faker.php b/install/tax_faker.php
new file mode 100755
index 000000000..5d534e2ef
--- /dev/null
+++ b/install/tax_faker.php
@@ -0,0 +1,116 @@
+<?php
+use Thelia\Constraint\ConstraintFactory;
+use Thelia\Constraint\ConstraintManager;
+use Thelia\Constraint\Rule\AvailableForTotalAmount;
+use Thelia\Constraint\Rule\AvailableForTotalAmountManager;
+use Thelia\Constraint\Rule\AvailableForXArticlesManager;
+use Thelia\Constraint\Rule\Operators;
+use Thelia\Coupon\CouponRuleCollection;
+use Thelia\Model\ProductImage;
+use Thelia\Model\CategoryImage;
+use Thelia\Model\FolderImage;
+use Thelia\Model\ContentImage;
+use Imagine\Image\Color;
+use Imagine\Image\Point;
+
+require __DIR__ . '/../core/bootstrap.php';
+
+$thelia = new Thelia\Core\Thelia("dev", true);
+$thelia->boot();
+
+$faker = Faker\Factory::create();
+
+$con = \Propel\Runtime\Propel::getConnection(
+    Thelia\Model\Map\ProductTableMap::DATABASE_NAME
+);
+$con->beginTransaction();
+
+$currency = \Thelia\Model\CurrencyQuery::create()->filterByCode('EUR')->findOne();
+
+try {
+    $stmt = $con->prepare("SET foreign_key_checks = 0");
+    $stmt->execute();
+
+    \Thelia\Model\TaxQuery::create()
+        ->find()
+        ->delete();
+
+    \Thelia\Model\Base\TaxRuleQuery::create()
+        ->find()
+        ->delete();
+
+    \Thelia\Model\Base\TaxRuleCountryQuery::create()
+        ->find()
+        ->delete();
+
+    $stmt = $con->prepare("SET foreign_key_checks = 1");
+    $stmt->execute();
+
+    /* 10% tax */
+    $tax10p = new \Thelia\Model\Tax();
+    $tax10p->setType('PricePercentTaxType')
+        ->setRequirements(array('percent' => 10))
+        ->save();
+
+    /* 8% tax */
+    $tax8p = new \Thelia\Model\Tax();
+    $tax8p->setType('PricePercentTaxType')
+        ->setRequirements(array('percent' => 8))
+        ->save();
+
+    /* fix 5 tax */
+    $tax5 = new \Thelia\Model\Tax();
+    $tax5->setType('FixAmountTaxType')
+        ->setRequirements(array('amount' => 5))
+        ->save();
+
+    /* 1% tax */
+    $tax1p = new \Thelia\Model\Tax();
+    $tax1p->setType('PricePercentTaxType')
+        ->setRequirements(array('percent' => 1))
+        ->save();
+
+    /* tax rule */
+    $taxRule = new \Thelia\Model\TaxRule();
+    $taxRule->save();
+
+    /* add 4 taxes to the rule for France (64) */
+    $taxRuleCountry = new \Thelia\Model\TaxRuleCountry();
+    $taxRuleCountry->setTaxRule($taxRule)
+        ->setCountryId(64)
+        ->setTax($tax10p)
+        ->setPosition(1)
+        ->save();
+
+    $taxRuleCountry = new \Thelia\Model\TaxRuleCountry();
+    $taxRuleCountry->setTaxRule($taxRule)
+        ->setCountryId(64)
+        ->setTax($tax8p)
+        ->setPosition(1)
+        ->save();
+
+    $taxRuleCountry = new \Thelia\Model\TaxRuleCountry();
+    $taxRuleCountry->setTaxRule($taxRule)
+        ->setCountryId(64)
+        ->setTax($tax5)
+        ->setPosition(2)
+        ->save();
+
+    $taxRuleCountry = new \Thelia\Model\TaxRuleCountry();
+    $taxRuleCountry->setTaxRule($taxRule)
+        ->setCountryId(64)
+        ->setTax($tax1p)
+        ->setPosition(3)
+        ->save();
+
+    foreach(\Thelia\Model\ProductQuery::create()->find() as $productActiveRecord) {
+        $productActiveRecord->setTaxRule($taxRule)
+            ->save();
+    }
+
+    $con->commit();
+
+} catch (Exception $e) {
+    echo "error : ".$e->getMessage()."\n";
+    $con->rollBack();
+}