diff --git a/frontend/src/pages/contracts/ContractForm.tsx b/frontend/src/pages/contracts/ContractForm.tsx
index a20dfbdd..34a6fca5 100644
--- a/frontend/src/pages/contracts/ContractForm.tsx
+++ b/frontend/src/pages/contracts/ContractForm.tsx
@@ -1086,6 +1086,18 @@ export default function ContractForm() {
                   <label className="flex items-center gap-2 mb-2 text-sm font-medium text-gray-700">
                     <span>Portal Benutzername</span>
                     {copyValue && <CopyButton value={copyValue} title={`Benutzername "${copyValue}" in Zwischenablage kopieren`} />}
+                    {customerId && (
+                      <a
+                        href={`/customers/${customerId}?tab=stressfrei`}
+                        target="_blank"
+                        rel="noopener noreferrer"
+                        title={`${customerEmailLabel} Adresse beim Kunden anlegen (neuer Tab)`}
+                        aria-label={`${customerEmailLabel} Adresse beim Kunden anlegen (neuer Tab)`}
+                        className="text-gray-400 hover:text-blue-600 p-0.5 rounded"
+                      >
+                        <ExternalLink className="w-3.5 h-3.5" />
+                      </a>
+                    )}
                   </label>
                 );
               })()}