diff --git a/backend/core/api/public/endpoints/Invoices/edit.py b/backend/core/api/public/endpoints/Invoices/edit.py
index c888550c..ada5aef1 100644
--- a/backend/core/api/public/endpoints/Invoices/edit.py
+++ b/backend/core/api/public/endpoints/Invoices/edit.py
@@ -1,4 +1,6 @@
 from datetime import datetime
+from typing import Literal
+
 from rest_framework import status
 from rest_framework.decorators import api_view
 from rest_framework.response import Response
@@ -72,7 +74,7 @@ def edit_invoice_endpoint(request: APIRequest):
 
 @api_view(["POST"])
 def change_status_endpoint(request, invoice_id: int, invoice_status: str):
-    invoice_status = invoice_status.lower() if invoice_status else ""
+    invoice_status: Literal["paid", "draft", "pending"] = invoice_status.lower() if invoice_status else ""
 
     try:
         invoice = Invoice.objects.get(id=invoice_id)
diff --git a/backend/finance/api/invoices/edit.py b/backend/finance/api/invoices/edit.py
index d28d32b3..1c9be2ec 100644
--- a/backend/finance/api/invoices/edit.py
+++ b/backend/finance/api/invoices/edit.py
@@ -1,4 +1,5 @@
 from datetime import datetime
+from typing import Literal
 
 from django.contrib import messages
 from django.http import HttpRequest, JsonResponse, HttpResponse
@@ -76,7 +77,7 @@ def edit_invoice(request: HtmxHttpRequest):
 @require_POST
 @web_require_scopes("invoices:write", True, True)
 def change_status(request: HtmxHttpRequest, invoice_id: int, status: str) -> HttpResponse:
-    status = status.lower() if status else ""
+    status: Literal["paid", "draft", "pending"] = status.lower() if status else ""
 
     if not request.htmx:
         return redirect("finance:invoices:single:dashboard")