diff --git a/apps/edr-freight-api/src/modules/billing/billing.service.ts b/apps/edr-freight-api/src/modules/billing/billing.service.ts
index eab221505..10a20ea03 100644
--- a/apps/edr-freight-api/src/modules/billing/billing.service.ts
+++ b/apps/edr-freight-api/src/modules/billing/billing.service.ts
@@ -351,20 +351,24 @@ export class BillingService {
       qb.andWhere("invoice.balanceAmount > 0 AND invoice.dueAt < now()");
     }
     if (filter.search) {
-      // Searches what the row actually shows: its number, who it bills, and
-      // the source record behind it (booking reference, GRN, shipping line).
+      // Searches what the row actually shows: its number, who it bills, the
+      // source record behind it (booking reference, PNR, GRN, shipping line)
+      // and the payment references a customer or a provider support desk would
+      // quote back — the gateway transaction id and our merchant order id.
       // The raw `sourceId` stays matchable so a pasted UUID still resolves.
-      // Requires the `company` alias — every caller of this joins it.
+      // Requires the `company` and `payment` aliases — every caller joins both.
       qb.andWhere(
         `(invoice.invoiceNumber ILIKE :search
           OR invoice.sourceId ILIKE :search
           OR company.name ILIKE :search
+          OR payment.transactionId ILIKE :search
+          OR payment.merchantOrderId ILIKE :search
           OR EXISTS (
                SELECT 1 FROM freight.bookings b
                LEFT JOIN freight.warehouse_inventory wi ON wi.booking_id = b.id
                LEFT JOIN freight.first_mile fm ON fm.booking_id = b.id
                LEFT JOIN freight.last_mile lm ON lm.booking_id = b.id
-               WHERE b.reference ILIKE :search
+               WHERE (b.reference ILIKE :search OR b.pnr_code ILIKE :search)
                  AND (b.id::text = invoice.source_id
                       OR wi.id::text = invoice.source_id
                       OR fm.id::text = invoice.source_id
diff --git a/apps/edr-freight-api/src/modules/exports/datasets/invoices.dataset.ts b/apps/edr-freight-api/src/modules/exports/datasets/invoices.dataset.ts
index 59d6db4ca..56ab3b74e 100644
--- a/apps/edr-freight-api/src/modules/exports/datasets/invoices.dataset.ts
+++ b/apps/edr-freight-api/src/modules/exports/datasets/invoices.dataset.ts
@@ -41,7 +41,7 @@ export const invoicesDataset: ExportDataset = {
     // other way throws on those rows.
     { alias: 'bk', entity: Booking, on: "bk.id::text = i.source_id AND i.source = 'booking'" },
   ],
-  alwaysJoin: ['c', 'p'],
+  alwaysJoin: ['c', 'p', 'bk'],
 
   groups: [
     { id: 'invoice', label: 'Invoice' },
@@ -134,7 +134,7 @@ export const invoicesDataset: ExportDataset = {
     { key: 'hasBalance', label: 'Outstanding only', type: 'text' },
     { key: 'overdue', label: 'Overdue only', type: 'text' },
     { key: 'companyId', label: 'Customer', type: 'text' },
-    { key: 'search', label: 'Search invoice no. or customer', type: 'text' },
+    { key: 'search', label: 'Search invoice no., customer, PNR or transaction ref', type: 'text' },
   ],
 
   defaultSort: { key: 'issuedAt', dir: 'DESC' },
@@ -171,7 +171,18 @@ export const invoicesDataset: ExportDataset = {
     if (params.overdue === 'true') qb.andWhere('i.balance_amount > 0 AND i.due_at < now()');
     if (params.companyId) qb.andWhere('i.company_id = :companyId', { companyId: params.companyId });
     if (params.search) {
-      qb.andWhere('(i.invoice_number ILIKE :search OR c.name ILIKE :search)', { search: `%${params.search as string}%` });
+      // Same reach as the list page's search box, minus the source-record
+      // lookups it does with correlated subqueries: number, customer, the PNR
+      // the customer pays against, and the payment references support desks
+      // quote back.
+      qb.andWhere(
+        `(i.invoice_number ILIKE :search
+          OR c.name ILIKE :search
+          OR bk.pnr_code ILIKE :search
+          OR p.transaction_id ILIKE :search
+          OR p.merchant_order_id ILIKE :search)`,
+        { search: `%${params.search as string}%` },
+      );
     }
     // ACL: invoices.source_id is a varchar pointer at the originating booking.
     applyBookingRefDirectionScope(qb, 'i.source_id', directions);
diff --git a/apps/edr-freight-web/backoffice/src/pages/invoices/InvoicesPage.tsx b/apps/edr-freight-web/backoffice/src/pages/invoices/InvoicesPage.tsx
index 5361558fb..8b28fd71a 100644
--- a/apps/edr-freight-web/backoffice/src/pages/invoices/InvoicesPage.tsx
+++ b/apps/edr-freight-web/backoffice/src/pages/invoices/InvoicesPage.tsx
@@ -370,7 +370,7 @@ export default function InvoicesPanel() {
             <FilterBar
               defs={INVOICE_FILTER_DEFS}
               controls={controls}
-              searchPlaceholder="Search invoice, customer, booking ref, GRN or shipping line…"
+              searchPlaceholder="Search invoice, customer, booking ref, PNR, transaction ref, GRN or shipping line…"
               sortOptions={SORT_OPTIONS}
               viewId="invoices"
             >