diff --git a/core/class/declarationtva.class.php b/core/class/declarationtva.class.php
index 41d96dc..e33f887 100644
--- a/core/class/declarationtva.class.php
+++ b/core/class/declarationtva.class.php
@@ -287,10 +287,12 @@ class DeclarationTVA
             $result = $this->db->query($sql);
             if ($result && $this->db->num_rows($result) > 0) {
                 $obj = $this->db->fetch_object($result);
-                $total_amount = $obj->total_debit - $obj->total_credit;
+                
+                // For VAT accounts, we need the absolute value since credit side contains VAT amounts
+                $total_amount = abs($obj->total_debit - $obj->total_credit);
                 
                 // Log successful query for debugging
-                error_log("DeclarationTVA: Found data with query: " . substr($sql, 0, 100) . "... Amount: $total_amount");
+                error_log("DeclarationTVA: Found data with query: " . substr($sql, 0, 100) . "... Debit: " . $obj->total_debit . ", Credit: " . $obj->total_credit . ", Amount: $total_amount");
                 
                 return array(
                     'base_amount' => $total_amount,