diff --git a/htdocs/langs/en_US/projects.lang b/htdocs/langs/en_US/projects.lang
index dd79af04bcb..5f71b230537 100644
--- a/htdocs/langs/en_US/projects.lang
+++ b/htdocs/langs/en_US/projects.lang
@@ -55,6 +55,7 @@ TasksOnOpenedProject=Tasks on open projects
 WorkloadNotDefined=Workload not defined
 NewTimeSpent=Time spent
 MyTimeSpent=My time spent
+BillTime=Bill the time spent
 Tasks=Tasks
 Task=Task
 TaskDateStart=Task start date
diff --git a/htdocs/projet/card.php b/htdocs/projet/card.php
index 71be9b5d4a3..7494a5a15bb 100644
--- a/htdocs/projet/card.php
+++ b/htdocs/projet/card.php
@@ -161,6 +161,7 @@ if (empty($reshook))
 			$object->statut          = $status;
 			$object->opp_status      = $opp_status;
 			$object->opp_percent     = $opp_percent;
+			$object->bill_time       = (GETPOST('bill_time','alpha')=='on'?1:0);
 
 			// Fill array 'array_options' with data from add form
 			$ret = $extrafields->setOptionalsFromPost($extralabels,$object);
@@ -261,6 +262,7 @@ if (empty($reshook))
 			if (isset($_POST['budget_amount'])) $object->budget_amount= price2num(GETPOST('budget_amount','alpha'));
 			if (isset($_POST['opp_status']))    $object->opp_status   = $opp_status;
 			if (isset($_POST['opp_percent']))   $object->opp_percent  = $opp_percent;
+			$object->bill_time       = (GETPOST('bill_time','alpha')=='on'?1:0);
 
 			// Fill array 'array_options' with data from add form
 			$ret = $extrafields->setOptionalsFromPost($extralabels,$object);
@@ -599,6 +601,14 @@ if ($action == 'create' && $user->rights->projet->creer)
 	print '<textarea name="description" wrap="soft" class="centpercent" rows="'.ROWS_3.'">'.dol_escape_htmltag(GETPOST("description",'none')).'</textarea>';
 	print '</td></tr>';
 
+	// Bill time
+	if (! empty($conf->global->PROJECT_BILL_TIME_SPENT))
+	{
+		print '<tr><td>'.$langs->trans("BillTime").'</td>';
+		print '<td><input type="checkbox" name="bill_time"'.(GETPOST('bill_time','alpha')!=''?' checked="checked"':'').'"></td>';
+		print '</tr>';
+	}
+
 	if ($conf->categorie->enabled) {
 		// Categories
 		print '<tr><td>'.$langs->trans("Categories").'</td><td colspan="3">';
@@ -826,6 +836,14 @@ elseif ($object->id > 0)
 		print '<textarea name="description" wrap="soft" class="centpercent" rows="'.ROWS_3.'">'.$object->description.'</textarea>';
 		print '</td></tr>';
 
+		// Bill time
+		if (! empty($conf->global->PROJECT_BILL_TIME_SPENT))
+		{
+			print '<tr><td>'.$langs->trans("BillTime").'</td>';
+			print '<td><input type="checkbox" name="bill_time"'.((GETPOSTISSET('bill_time')?GETPOST('bill_time','alpha'):$object->bill_time) ? ' checked="checked"' : '').'"></td>';
+			print '</tr>';
+		}
+
 		// Tags-Categories
 		if ($conf->categorie->enabled)
 		{
@@ -948,6 +966,14 @@ elseif ($object->id > 0)
 		print nl2br($object->description);
 		print '</td></tr>';
 
+		// Bill time
+		if (! empty($conf->global->PROJECT_BILL_TIME_SPENT))
+		{
+			print '<tr><td>'.$langs->trans("BillTime").'</td>';
+			print '<td>'.yn($object->bill_time).'</td>';
+			print '</tr>';
+		}
+
 		// Categories
 		if($conf->categorie->enabled) {
 			print '<tr><td valign="middle">'.$langs->trans("Categories").'</td><td>';
diff --git a/htdocs/projet/class/project.class.php b/htdocs/projet/class/project.class.php
index 6e8c12793cc..ed25f3ba813 100644
--- a/htdocs/projet/class/project.class.php
+++ b/htdocs/projet/class/project.class.php
@@ -64,6 +64,7 @@ class Project extends CommonObject
 	var $user_close_id;
     var $public;      //!< Tell if this is a public or private project
     var $budget_amount;
+    var $bill_time;			// Is the time spent on project must be invoiced or not
 
     var $statuts_short;
     var $statuts_long;
@@ -178,6 +179,7 @@ class Project extends CommonObject
         $sql.= ", datee";
         $sql.= ", opp_amount";
         $sql.= ", budget_amount";
+        $sql.= ", bill_time";
         $sql.= ", entity";
         $sql.= ") VALUES (";
         $sql.= "'" . $this->db->escape($this->ref) . "'";
@@ -297,6 +299,7 @@ class Project extends CommonObject
             $sql.= ", opp_amount = " . (strcmp($this->opp_amount, '') ? price2num($this->opp_amount) : "null");
             $sql.= ", budget_amount = " . (strcmp($this->budget_amount, '')  ? price2num($this->budget_amount) : "null");
             $sql.= ", fk_user_modif = " . $user->id;
+            $sql.= ", bill_time = " . ($this->bill_time ? 1 : 0);
             $sql.= " WHERE rowid = " . $this->id;
 
             dol_syslog(get_class($this)."::update", LOG_DEBUG);
@@ -394,7 +397,8 @@ class Project extends CommonObject
         if (empty($id) && empty($ref)) return -1;
 
         $sql = "SELECT rowid, ref, title, description, public, datec, opp_amount, budget_amount,";
-        $sql.= " tms, dateo, datee, date_close, fk_soc, fk_user_creat, fk_user_modif, fk_user_close, fk_statut, fk_opp_status, opp_percent, note_private, note_public, model_pdf";
+        $sql.= " tms, dateo, datee, date_close, fk_soc, fk_user_creat, fk_user_modif, fk_user_close, fk_statut, fk_opp_status, opp_percent,";
+        $sql.= " note_private, note_public, model_pdf, bill_time";
         $sql.= " FROM " . MAIN_DB_PREFIX . "projet";
         if (! empty($id))
         {
@@ -441,6 +445,7 @@ class Project extends CommonObject
                 $this->opp_percent	= $obj->opp_percent;
                 $this->budget_amount	= $obj->budget_amount;
                 $this->modelpdf	= $obj->model_pdf;
+                $this->bill_time = (int) $obj->bill_time;
 
                 $this->db->free($resql);