diff --git a/src/integrations/supabase/types.ts b/src/integrations/supabase/types.ts
index c8784fe..c52fcac 100644
--- a/src/integrations/supabase/types.ts
+++ b/src/integrations/supabase/types.ts
@@ -1652,7 +1652,9 @@ export type Database = {
           external_id: string | null
           id: string
           invoice_id: string | null
+          quantity: number
           receipt_storage_path: string | null
+          unit_price: number
           updated_at: string
           user_id: string
         }
@@ -1667,7 +1669,9 @@ export type Database = {
           external_id?: string | null
           id?: string
           invoice_id?: string | null
+          quantity?: number
           receipt_storage_path?: string | null
+          unit_price?: number
           updated_at?: string
           user_id: string
         }
@@ -1682,7 +1686,9 @@ export type Database = {
           external_id?: string | null
           id?: string
           invoice_id?: string | null
+          quantity?: number
           receipt_storage_path?: string | null
+          unit_price?: number
           updated_at?: string
           user_id?: string
         }
diff --git a/supabase/migrations/20260425185053_96ee636e-66fc-4cd1-98ec-a96801a73c96.sql b/supabase/migrations/20260425185053_96ee636e-66fc-4cd1-98ec-a96801a73c96.sql
new file mode 100644
index 0000000..7e3097d
--- /dev/null
+++ b/supabase/migrations/20260425185053_96ee636e-66fc-4cd1-98ec-a96801a73c96.sql
@@ -0,0 +1,11 @@
+-- Add quantity and unit_price columns to expenses for itemized billing.
+-- amount remains the stored total = quantity * unit_price for backwards
+-- compatibility with reports, invoices, and trust accounting.
+ALTER TABLE public.expenses
+  ADD COLUMN IF NOT EXISTS quantity numeric NOT NULL DEFAULT 1,
+  ADD COLUMN IF NOT EXISTS unit_price numeric NOT NULL DEFAULT 0;
+
+-- Backfill: for existing rows, set unit_price = amount and quantity = 1.
+UPDATE public.expenses
+   SET unit_price = amount, quantity = 1
+ WHERE unit_price = 0 AND amount IS NOT NULL;
\ No newline at end of file