diff --git a/src/Budget.Client/src/schemas/index.ts b/src/Budget.Client/src/schemas/index.ts
new file mode 100644
index 0000000..7159f4a
--- /dev/null
+++ b/src/Budget.Client/src/schemas/index.ts
@@ -0,0 +1,48 @@
+import { z } from 'zod';
+
+const frequencyValues = [
+  'Biennial',
+  'Annually',
+  'Biannually',
+  'Quarterly',
+  'EveryTwoMonths',
+  'Monthly',
+  'SemiMonthly',
+  'Biweekly',
+  'Weekly',
+] as const;
+
+export const createBudgetSchema = z.object({
+  name: z.string().min(1, 'Name is required').max(200),
+});
+
+export const createIncomeSchema = z.object({
+  name: z.string().min(1, 'Name is required').max(200),
+  frequency: z.enum(frequencyValues),
+  amount: z.coerce.number({ error: 'Amount is required' }).positive('Must be positive'),
+});
+
+export const createOutgoSchema = z.object({
+  name: z.string().min(1, 'Name is required').max(200),
+  category: z.string().max(100).optional(),
+  type: z.enum(['Need', 'Want', 'Save']),
+  frequency: z.enum(frequencyValues),
+  amount: z.coerce.number().positive('Must be positive'),
+  paymentSource: z.string().max(100).optional(),
+  notes: z.string().max(1000).optional(),
+});
+
+export const createShareSchema = z.object({
+  email: z.string().email('Must be a valid email'),
+  permission: z.enum(['View', 'Edit']),
+});
+
+export const updateTaxRateSchema = z.object({
+  effectiveTaxRate: z.coerce.number().min(0).max(0.99),
+});
+
+export type CreateBudgetInput = z.infer<typeof createBudgetSchema>;
+export type CreateIncomeInput = z.infer<typeof createIncomeSchema>;
+export type CreateOutgoInput = z.infer<typeof createOutgoSchema>;
+export type CreateShareInput = z.infer<typeof createShareSchema>;
+export type UpdateTaxRateInput = z.infer<typeof updateTaxRateSchema>;