diff --git a/app/Service/Informe/Contabilidad/Resumen.php b/app/Service/Informe/Contabilidad/Resumen.php
index f004b85..85f53f8 100644
--- a/app/Service/Informe/Contabilidad/Resumen.php
+++ b/app/Service/Informe/Contabilidad/Resumen.php
@@ -4,6 +4,8 @@ namespace App\Service\Informe\Contabilidad;
 use DateTimeInterface;
 use DateTimeImmutable;
 use DateInterval;
+
+use App\Service\Informe\Informe;
 use Incoviba\old\Proyecto\Proyecto;
 use Incoviba\old\Venta\Venta;
 use Incoviba\old\Venta\Pago;
@@ -137,7 +139,7 @@ class Resumen
                 $haber -= $pago->valor;
             }
         }
-        $output []= implode($this->separator, ['', $haber, $debe]);
+        $output []= implode($this->separator, ['', '', $haber, $debe]);
         return $output;
     }
 
@@ -150,7 +152,12 @@ class Resumen
             $output = array_merge($output, $this->buildLibro($venta, $up_to), [''], ['']);
         }
 
-        $filename = "Contabilidad - Resumen - {$ventas[0]->proyecto()->descripcion} - {$up_to->format('Y-m-d')}.csv";
+        $filename = "Contabilidad - Resumen - {$ventas[0]->proyecto()->descripcion} - {$up_to->format('Y-m-d')}.xlsx";
+        $informe = new Informe();
+        $informe->createSpreadsheet()
+            ->addArray($output)
+            ->send($filename);
+        return;
 
         header("Content-Type: text/csv; charset=utf-8");
         header('Content-Disposition: attachment; filename="' . $filename . '"');
diff --git a/app/Service/Informe/Informe.php b/app/Service/Informe/Informe.php
new file mode 100644
index 0000000..fac7ad3
--- /dev/null
+++ b/app/Service/Informe/Informe.php
@@ -0,0 +1,29 @@
+<?php
+namespace App\Service\Informe;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\IOFactory;
+
+class Informe
+{
+    protected $spreadsheet;
+    public function createSpreadsheet()
+    {
+        $this->spreadsheet = new Spreadsheet();
+        return $this;
+    }
+    public function addArray(array $data, string $start = 'A1')
+    {
+        $this->spreadsheet->getActiveSheet()->fromArray($data, null, $start);
+        return $this;
+    }
+    public function send(string $filename)
+    {
+        header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
+        header("Content-Disposition: attachment;filename='{$filename}'");
+        header('Cache-Control: max-age=0');
+
+        $writer = IOFactory::createWriter($this->spreadsheet, 'Xlsx');
+        $writer->save('php://output');
+    }
+}