diff --git a/local/modules/DigressivePrice/I18n/backOffice/default/fr_FR.php b/local/modules/DigressivePrice/I18n/backOffice/default/fr_FR.php
index d5092b00..6000e105 100644
--- a/local/modules/DigressivePrice/I18n/backOffice/default/fr_FR.php
+++ b/local/modules/DigressivePrice/I18n/backOffice/default/fr_FR.php
@@ -20,5 +20,8 @@ return array(
     'The end of range must be greater than the beginning' => 'La quantité de fin de tranche doit être inférieure à celle de début',
     'Your new range surrounds an existing one' => 'Votre tranche de quantités en englobe une autre',
     'Your new range begins in another one' => 'Votre tranche de quantités débute dans une autre',
-    'Your new range ends in another one' => 'Votre tranche de quantités se termine dans une autre'
+    'Your new range ends in another one' => 'Votre tranche de quantités se termine dans une autre',
+
+    'Price with taxes' => 'Prix TTC',
+    'Sale price with taxes' => 'Prix promo TTC',
 );
diff --git a/local/modules/DigressivePrice/templates/backOffice/default/product-tab-content-hook.html b/local/modules/DigressivePrice/templates/backOffice/default/product-tab-content-hook.html
index e47f1030..ac6f7260 100644
--- a/local/modules/DigressivePrice/templates/backOffice/default/product-tab-content-hook.html
+++ b/local/modules/DigressivePrice/templates/backOffice/default/product-tab-content-hook.html
@@ -18,14 +18,20 @@
         {form name="digressiveprice.delete"}
             {if $form_error}<div class="alert alert-danger">{$form_error_message}</div>{/if}
         {/form}
-        
+
+        {loop name="tax-loop" type="tax" country="64" tax_rule="{product attr="tax_rule_id"}"}
+            <input type="hidden" id="taux-tva" value="{$REQUIREMENTS.percent}">
+        {/loop}
+
         <table class="table table-hover">
             <thead>
                 <tr>
                     <th>{intl l="From" d="digressiveprice.bo.default"}</th>
                     <th>{intl l="To" d="digressiveprice.bo.default"}</th>
                     <th>{intl l="Price w/o taxes" d="digressiveprice.bo.default"}</th>
+                    <th>{intl l="Price with taxes" d="digressiveprice.bo.default"}</th>
                     <th>{intl l="Sale price w/o taxes" d="digressiveprice.bo.default"}</th>
+                    <th>{intl l="Sale price with taxes" d="digressiveprice.bo.default"}</th>
                     <th colspan="2">&nbsp;</th>
                 </tr>
             </thead>
@@ -37,6 +43,8 @@
                     {form name="digressiveprice.update"}
                     <form action="{url path='/admin/module/DigressivePrice/update'}" class="form-inline" role="form" {form_enctype form=$form} method="post">
 
+                        {assign var="digressiveId" value="$ID"}
+
                         {form_hidden_fields form=$form}
 
                         {form_field form=$form field="id"}
@@ -66,19 +74,32 @@
                             <td>
                                 {form_field form=$form field="price"}
                                 <span class="input-group">
-                                    <input name="{$name}" value="{format_number number=$PRICE decimals="2" dec_point='.'}" class="form-control" type="text" required>
+                                    <input name="{$name}" value="{format_number number=$PRICE decimals="8" dec_point='.'}" class="form-control" type="text" id="prix-ht-{$digressiveId}" required>
                                     <span class="input-group-addon">{$SYMBOL}</span>
                                 </span>
                                 {/form_field}
                             </td>
+                            <td>
+                                <span class="input-group">
+                                        <input id="prix-ttc-{$digressiveId}" name="prix-ttc" value="" class="form-control" type="text" required style="background-color:#95c11e" onchange="modifTTC({$digressiveId});">
+                                        <span class="input-group-addon">{$SYMBOL}</span>
+                                    </span>
+                            </td>
+
                             <td>
                                 {form_field form=$form field="promo"}
                                 <span class="input-group">
-                                    <input name="{$name}" value="{format_number number=$PROMO_PRICE decimals="2" dec_point='.'}" class="form-control" type="text" required>
+                                    <input name="{$name}" value="{format_number number=$PROMO_PRICE decimals="8" dec_point='.'}" class="form-control" type="text" id="prix-promo-ht-{$digressiveId}" required>
                                     <span class="input-group-addon">{$SYMBOL}</span>
                                 </span>
                                 {/form_field}
                             </td>
+                            <td>
+                                <span class="input-group">
+                                        <input id="prix-promo-ttc-{$digressiveId}" name="prix-promo-ttc" value="" class="form-control" type="text" required style="background-color:#95c11e" onchange="modifPromoTTC({$digressiveId});">
+                                        <span class="input-group-addon">{$SYMBOL}</span>
+                                    </span>
+                            </td>
                         {/loop}
 
                         <!-- Update -->
@@ -167,4 +188,27 @@
         </table>
     </div>
 </div>
+
+<script>
+
+    function calculerHt(ttc) {
+        var tauxTva = parseFloat(document.getElementById('taux-tva').value);
+
+        return (ttc * 100) / (100 + tauxTva);
+    }
+
+    function modifTTC(id) {
+        var ttc = document.getElementById('prix-ttc-' + id).value;
+        var ht = calculerHt(ttc);
+        document.getElementById('prix-ht-' + id).value = ht;
+    }
+
+    function modifPromoTTC(id) {
+        var ttc = document.getElementById('prix-promo-ttc-' + id).value;
+        var ht = calculerHt(ttc);
+        document.getElementById('prix-promo-ht-' + id).value = ht;
+    }
+
+</script>
+
 {/if}