diff --git a/core/class/declarationtva.class.php b/core/class/declarationtva.class.php
index 38dfcb9..37b4e47 100644
--- a/core/class/declarationtva.class.php
+++ b/core/class/declarationtva.class.php
@@ -1606,6 +1606,9 @@ class DeclarationTVA
      */
     public function resetDeclarationStatus($declaration_id)
     {
+        // Delete any existing PDF files before resetting status
+        $this->deleteValidatedPDF($declaration_id);
+        
         $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_declarations 
                 SET status = 'validated'
                 WHERE rowid = " . (int)$declaration_id . " AND entity = " . $this->entity;
@@ -1854,6 +1857,9 @@ class DeclarationTVA
      */
     public function unvalidateDeclaration($declaration_id)
     {
+        // Delete validated PDF files before unvalidating
+        $this->deleteValidatedPDF($declaration_id);
+        
         // Check if the validated_date and validated_by columns exist
         $sql_check_columns = "SHOW COLUMNS FROM " . MAIN_DB_PREFIX . "declarationtva_declarations LIKE 'validated_date'";
         $result_check = $this->db->query($sql_check_columns);
@@ -2111,6 +2117,77 @@ class DeclarationTVA
         return false;
     }
     
+    /**
+     * Delete validated PDF files for a declaration
+     *
+     * @param int $declaration_id Declaration ID
+     * @return bool Success
+     */
+    public function deleteValidatedPDF($declaration_id)
+    {
+        // Get declaration details
+        $sql = "SELECT declaration_number FROM " . MAIN_DB_PREFIX . "declarationtva_declarations 
+                WHERE rowid = " . (int)$declaration_id . " AND entity = " . $this->entity;
+        
+        $result = $this->db->query($sql);
+        if (!$result || $this->db->num_rows($result) == 0) {
+            return false;
+        }
+        
+        $obj = $this->db->fetch_object($result);
+        $declaration_number = $obj->declaration_number;
+        
+        // Check if PDF file exists in the VAT declarations validated directory
+        $vat_declarations_dir = DOL_DATA_ROOT . '/declarationtva/validated/';
+        
+        // Look for PDF files with the declaration ID
+        $pattern = $vat_declarations_dir . 'CA3_' . $declaration_id . '_*.pdf';
+        $files = glob($pattern);
+        
+        // If no files found with the exact pattern, try a more flexible search
+        if (empty($files)) {
+            $pattern = $vat_declarations_dir . 'CA3_*' . $declaration_id . '*.pdf';
+            $files = glob($pattern);
+        }
+        
+        // Also search by declaration number
+        if (empty($files)) {
+            $pattern = $vat_declarations_dir . 'CA3_' . $declaration_number . '_*.pdf';
+            $files = glob($pattern);
+        }
+        
+        $deleted_count = 0;
+        foreach ($files as $file) {
+            if (file_exists($file)) {
+                if (unlink($file)) {
+                    $deleted_count++;
+                    error_log("DEBUG: Deleted validated PDF: " . $file);
+                } else {
+                    error_log("DEBUG: Failed to delete PDF: " . $file);
+                }
+            }
+        }
+        
+        // Also check and delete from temporary directory
+        $temp_dir = DOL_DATA_ROOT . '/declarationtva/';
+        $temp_pattern = $temp_dir . 'CA3_' . $declaration_id . '_*.pdf';
+        $temp_files = glob($temp_pattern);
+        
+        foreach ($temp_files as $file) {
+            if (file_exists($file)) {
+                if (unlink($file)) {
+                    $deleted_count++;
+                    error_log("DEBUG: Deleted temporary PDF: " . $file);
+                } else {
+                    error_log("DEBUG: Failed to delete temporary PDF: " . $file);
+                }
+            }
+        }
+        
+        error_log("DEBUG: Deleted " . $deleted_count . " PDF files for declaration " . $declaration_id);
+        return true;
+    }
+    
     /**
      * Get the VAT declarations documents directory path
      *