diff --git a/core/class/declarationtva.class.php b/core/class/declarationtva.class.php
index 6c77f6f..dcd39df 100644
--- a/core/class/declarationtva.class.php
+++ b/core/class/declarationtva.class.php
@@ -541,7 +541,14 @@ class DeclarationTVA
      */
     public function getAccountAmounts($account_code, $start_date, $end_date)
     {
-        
+        // For VAT accounts (445*), use fiscal year start date instead of period start
+        if (strpos($account_code, '445') === 0) {
+            $fy_start = $this->getFiscalYearStartDate($end_date);
+            if (!empty($fy_start)) {
+                $start_date = $fy_start;
+            }
+        }
+
         // Use the correct Dolibarr accounting table structure
         $possible_queries = array(
             // Correct table and column names based on your Dolibarr structure
@@ -587,6 +594,37 @@ class DeclarationTVA
         return array('base_amount' => 0, 'vat_amount' => 0, 'total_amount' => 0);
     }
 
+    /**
+     * Get fiscal year start date for a given reference date
+     *
+     * @param string $reference_date Reference date (YYYY-MM-DD)
+     * @return string Fiscal year start date (YYYY-MM-DD)
+     */
+    private function getFiscalYearStartDate($reference_date)
+    {
+        // Try using Dolibarr accounting fiscal year table if available
+        $sql = "SHOW TABLES LIKE '" . MAIN_DB_PREFIX . "accounting_fiscalyear'";
+        $result = $this->db->query($sql);
+        if ($result && $this->db->num_rows($result) > 0) {
+            $fy_sql = "SELECT date_start FROM " . MAIN_DB_PREFIX . "accounting_fiscalyear 
+                       WHERE entity = " . $this->entity . " 
+                         AND date_start <= '" . $this->db->escape($reference_date) . "' 
+                         AND date_end >= '" . $this->db->escape($reference_date) . "' 
+                       ORDER BY date_start DESC LIMIT 1";
+            $fy_res = $this->db->query($fy_sql);
+            if ($fy_res && $this->db->num_rows($fy_res) > 0) {
+                $obj = $this->db->fetch_object($fy_res);
+                if (!empty($obj->date_start)) {
+                    return $obj->date_start;
+                }
+            }
+        }
+
+        // Fallback: January 1st of the year of the reference date
+        $year = date('Y', strtotime($reference_date));
+        return $year . '-01-01';
+    }
+
 
     /**
      * Create CA-3 line record