diff --git a/src/routes/invoices.$invoiceId.tsx b/src/routes/invoices.$invoiceId.tsx
index 43af859..357f412 100644
--- a/src/routes/invoices.$invoiceId.tsx
+++ b/src/routes/invoices.$invoiceId.tsx
@@ -131,6 +131,26 @@ function InvoiceDetail() {
   const balance = Number(invoice.total) - Number(invoice.amount_paid);
 
   const setStatus = async (status: string) => {
+    if (status === "void") {
+      if (!confirm("Void this invoice? Totals will be zeroed out and time/expenses will be unbilled.")) return;
+      // Unlink time/expenses so they go back to unbilled
+      await supabase.from("time_entries").update({ invoice_id: null }).eq("invoice_id", invoiceId);
+      await supabase.from("expenses").update({ invoice_id: null }).eq("invoice_id", invoiceId);
+      // Zero out line item amounts/rates so the invoice reads as $0
+      await supabase
+        .from("invoice_line_items")
+        .update({ amount: 0, rate: 0, quantity: 0 })
+        .eq("invoice_id", invoiceId);
+      // Zero invoice totals + set status
+      const { error } = await supabase
+        .from("invoices")
+        .update({ status: "void" as any, subtotal: 0, tax: 0, total: 0 })
+        .eq("id", invoiceId);
+      if (error) return toast.error(error.message);
+      toast.success("Invoice voided and zeroed out");
+      load();
+      return;
+    }
     const { error } = await supabase.from("invoices").update({ status: status as any }).eq("id", invoiceId);
     if (error) toast.error(error.message);
     else { toast.success(`Marked ${status}`); load(); }