diff --git a/db/bill.ts b/db/bill.ts
index 91717c6..99c0b39 100644
--- a/db/bill.ts
+++ b/db/bill.ts
@@ -15,6 +15,7 @@ export interface BillDocument
   milageEnd: number
   milage?: number
   rate: MILAGE_RATES
+  total: number
   status: BILL_STATUS
   additionalCosts: AdditionalCosts[]
 }
@@ -54,23 +55,26 @@ const BillSchema = new mongoose.Schema<BillDocument>(
       },
     },
     rate: {
-      type: Number,
+      type: String,
       enum: Object.values(MILAGE_RATES),
       default: MILAGE_RATES.EXTERN_UP_TO_200,
       required: true,
     },
-    status: {
-      type: String,
-      enum: Object.values(BILL_STATUS),
-      default: BILL_STATUS.UNINVOICED,
-      required: true,
-    },
     additionalCosts: [
       {
         name: { type: String, required: true },
         value: { type: Number, required: true },
       },
     ],
+    total: {
+      type: Number,
+      required: true,
+    },
+    status: {
+      type: String,
+      enum: Object.values(BILL_STATUS),
+      default: BILL_STATUS.UNINVOICED,
+    },
   },
   { timestamps: true, collation: { locale: 'de', strength: 1 } }
 )