diff --git a/src/Managers/InvoiceManager.php b/src/Managers/InvoiceManager.php
index <HASH>..<HASH> 100644
--- a/src/Managers/InvoiceManager.php
+++ b/src/Managers/InvoiceManager.php
@@ -33,7 +33,11 @@ class InvoiceManager extends Manager
      */
     public function issue(Invoice $invoice)
     {
-        $result = $this->update($invoice, ['issued_at' => new \DateTime(), 'number' => $this->getNumberManager()->calculateNextFreeNumber()]);
+        $result = $this->update($invoice, [
+            'issued_at' => new \DateTime(), 
+            'expires_at' => (new \DateTime())->modify("+1 month"), 
+            'number' => $this->getNumberManager()->calculateNextFreeNumber()
+        ]);
 
         $result->ok() && event(new Events\InvoiceIssued($invoice));
add expires_at when issued