diff --git a/client/src/api/expenseStandards.ts b/client/src/api/expenseStandards.ts
index 8a4917e5..ea7d7ec3 100644
--- a/client/src/api/expenseStandards.ts
+++ b/client/src/api/expenseStandards.ts
@@ -46,7 +46,16 @@ export type CreateExpenseStandardPayload = {
   note?: string | null;
 };
 
-export type UpdateExpenseStandardPayload = Partial<CreateExpenseStandardPayload>;
+export type UpdateExpenseStandardPayload = {
+  name?: string;
+  maxAmount?: string;
+  perUnit?: ExpenseStandardPerUnit;
+  controlMode?: ExpenseStandardControlMode;
+  scopeType?: ExpenseStandardScopeType;
+  scopeKey?: string | null;
+  enabled?: boolean;
+  note?: string | null;
+};
 
 function toQueryString(query: Record<string, string | number | boolean | undefined>) {
   const params = new URLSearchParams();
@@ -76,9 +85,28 @@ export async function createExpenseStandard(payload: CreateExpenseStandardPayloa
 }
 
 export async function updateExpenseStandard(standardId: string, payload: UpdateExpenseStandardPayload) {
+  const {
+    name,
+    maxAmount,
+    perUnit,
+    controlMode,
+    scopeType,
+    scopeKey,
+    enabled,
+    note,
+  } = payload;
   return apiRequestData<ExpenseStandard>(`/api/expense-standards/${standardId}`, {
     method: "PATCH",
-    body: JSON.stringify(payload),
+    body: JSON.stringify({
+      ...(name === undefined ? {} : { name }),
+      ...(maxAmount === undefined ? {} : { maxAmount }),
+      ...(perUnit === undefined ? {} : { perUnit }),
+      ...(controlMode === undefined ? {} : { controlMode }),
+      ...(scopeType === undefined ? {} : { scopeType }),
+      ...(scopeKey === undefined ? {} : { scopeKey }),
+      ...(enabled === undefined ? {} : { enabled }),
+      ...(note === undefined ? {} : { note }),
+    }),
   });
 }
 
diff --git a/client/src/pages/ExpenseStandardsPage.tsx b/client/src/pages/ExpenseStandardsPage.tsx
index ad4b70bf..f15a3004 100644
--- a/client/src/pages/ExpenseStandardsPage.tsx
+++ b/client/src/pages/ExpenseStandardsPage.tsx
@@ -140,8 +140,7 @@ export function ExpenseStandardsPage() {
 
   const saveMutation = useMutation({
     mutationFn: async () => {
-      const payload = {
-        expenseTypeId: form.expenseTypeId,
+      const mutablePayload = {
         name: form.name.trim(),
         maxAmount: form.maxAmount.trim(),
         perUnit: form.perUnit,
@@ -153,10 +152,13 @@ export function ExpenseStandardsPage() {
       };
 
       if (editingItem) {
-        return updateExpenseStandard(editingItem.id, payload);
+        return updateExpenseStandard(editingItem.id, mutablePayload);
       }
 
-      return createExpenseStandard(payload);
+      return createExpenseStandard({
+        expenseTypeId: form.expenseTypeId,
+        ...mutablePayload,
+      });
     },
     onSuccess: async () => {
       await queryClient.invalidateQueries({ queryKey: ["expense-standards"] });