diff --git a/app/lib/expense.tsx b/app/lib/expense.tsx
index 6964776..785c97a 100644
--- a/app/lib/expense.tsx
+++ b/app/lib/expense.tsx
@@ -8,9 +8,9 @@ export type PricingType = typeof pricingTypes[number];
 
 export class Expense implements Entity {
   id?: string;
-  name: string;
-  amount: number;
-  pricingType: PricingType;
+  name?: string;
+  amount?: number;
+  pricingType?: PricingType;
 
   constructor(id?: string, name?: string, amount?: number, pricingType?: PricingType) {
     this.id = id;