diff --git a/htdocs/admin/compta.php b/htdocs/admin/compta.php
index 9d3e8de3faf..68ac2429f56 100644
--- a/htdocs/admin/compta.php
+++ b/htdocs/admin/compta.php
@@ -18,11 +18,11 @@
  */
 
 /**
-	    \file       htdocs/admin/compta.php
-        \ingroup    tax
-        \brief      Page de configuration du module tax
-		\version    $Id$
-*/
+ \file       htdocs/admin/compta.php
+ \ingroup    tax
+ \brief      Page de configuration du module tax
+ \version    $Id$
+ */
 
 require('./pre.inc.php');
 require_once(DOL_DOCUMENT_ROOT."/lib/admin.lib.php");
@@ -31,7 +31,7 @@ $langs->load('admin');
 $langs->load('compta');
 
 if (!$user->admin)
-  accessforbidden();
+accessforbidden();
 
 
 llxHeader();
@@ -41,8 +41,10 @@ $compta_mode = defined('COMPTA_MODE')?COMPTA_MODE:'RECETTES-DEPENSES';
 
 if ($_POST['action'] == 'setcomptamode')
 {
-  $compta_mode = $_POST['compta_mode'];
-  if (! dolibarr_set_const($db, 'COMPTA_MODE', $compta_mode)) { print $db->error(); }
+	$compta_mode = $_POST['compta_mode'];
+	if (! dolibarr_set_const($db, 'COMPTA_MODE', $compta_mode)) { print $db->error(); }
+	// Note: This setup differs from TAX_MODE.
+	// TAX_MODE is used with 0=normal, 1=option vat for services is on debit
 }
 
 
@@ -54,7 +56,7 @@ if ($_POST['action'] == 'update' || $_POST['action'] == 'add')
 {
 	if (! dolibarr_set_const($db, $_POST['constname'], $_POST['constvalue'], $typeconst[$_POST['consttype']], 0, isset($_POST['constnote']) ? $_POST['constnote'] : ''));
 	{
-	  	print $db->error();
+		print $db->error();
 	}
 }
 
@@ -63,7 +65,7 @@ if ($_GET['action'] == 'delete')
 {
 	if (! dolibarr_del_const($db, $_GET['constname']));
 	{
-	  	print $db->error();
+		print $db->error();
 	}
 }
 
@@ -93,13 +95,13 @@ print '<td colspan="2">'.nl2br($langs->trans('OptionModeTrueDesc'));
 // Write info on way to count VAT
 if ($conf->global->MAIN_MODULE_COMPTABILITE)
 {
-//	print "<br>\n";
-//	print nl2br($langs->trans('OptionModeTrueInfoModuleComptabilite'));
+	//	print "<br>\n";
+	//	print nl2br($langs->trans('OptionModeTrueInfoModuleComptabilite'));
 }
 else
 {
-//	print "<br>\n";
-//	print nl2br($langs->trans('OptionModeTrueInfoExpert'));
+	//	print "<br>\n";
+	//	print nl2br($langs->trans('OptionModeTrueInfoExpert'));
 }
 print "</td></tr>\n";
 print '<tr '.$bc[true].'><td width="200"><input type="radio" name="compta_mode" value="CREANCES-DETTES"'.($compta_mode == 'CREANCES-DETTES' ? ' checked' : '').'> '.$langs->trans('OptionModeVirtual').'</td>';
@@ -115,7 +117,7 @@ $sql ="SELECT rowid, name, value, type, note";
 $sql.=" FROM llx_const";
 $sql.=" WHERE name like 'COMPTA_%' and name not in ('COMPTA_MODE')";
 $result = $db->query($sql);
-if ($result) 
+if ($result)
 {
 	$num = $db->num_rows($result);
 	$i = 0;
@@ -140,12 +142,12 @@ if ($result)
 		print '<input type="hidden" name="constname" value="'.$obj->name.'">';
 
 		print '<tr '.$bc[$var].' class="value">';
-		
+
 		// Param
 		print '<td>'.stripslashes(nl2br($obj->note));
 		print $obj->name;
 		print "</td>\n";
-		
+
 		// Value
 		print '<td>';
 		if ($obj->type == 'yesno')
@@ -170,7 +172,7 @@ if ($result)
 
 		$i++;
 	}
-    
+
 	if ($num)
 	{
 		print "</table>\n";
diff --git a/htdocs/admin/taxes.php b/htdocs/admin/taxes.php
index 4786b7b0187..6c583b74dbd 100644
--- a/htdocs/admin/taxes.php
+++ b/htdocs/admin/taxes.php
@@ -34,6 +34,9 @@ $langs->load('taxes');
 if (!$user->admin)
   accessforbidden();
 
+/*
+ * View
+ */
 
 llxHeader();
 
diff --git a/htdocs/compta/tva/clients.php b/htdocs/compta/tva/clients.php
index 317af8f7cc1..147299cb044 100644
--- a/htdocs/compta/tva/clients.php
+++ b/htdocs/compta/tva/clients.php
@@ -54,6 +54,7 @@ if($min == 0 or $min!=floatval(strval($min))){
 }
 
 // Define modetax (0 or 1)
+// 0=normal, 1=option vat for services is on debit
 $modetax = $conf->global->TAX_MODE;
 if ($_GET["modetax"]) $modetax=$_GET["modetax"];
 
diff --git a/htdocs/compta/tva/quadri_detail.php b/htdocs/compta/tva/quadri_detail.php
index d772fe9cb2b..94e94222397 100644
--- a/htdocs/compta/tva/quadri_detail.php
+++ b/htdocs/compta/tva/quadri_detail.php
@@ -54,6 +54,7 @@ if (empty($year))
 $q=(! empty($_GET["q"]))?$_GET["q"]:1;
 
 // Define modetax (0 or 1)
+// 0=normal, 1=option vat for services is on debit
 $modetax = $conf->global->TAX_MODE;
 if ($_GET["modetax"]) $modetax=$_GET["modetax"];