diff --git a/src/pages/accounting/AccountingReconcileDetailPage.tsx b/src/pages/accounting/AccountingReconcileDetailPage.tsx
index be31a28..cca3945 100644
--- a/src/pages/accounting/AccountingReconcileDetailPage.tsx
+++ b/src/pages/accounting/AccountingReconcileDetailPage.tsx
@@ -18,11 +18,31 @@ import {
   Select, SelectContent, SelectItem, SelectTrigger, SelectValue,
 } from "@/components/ui/select";
 import { Table, TableHeader, TableRow, TableHead, TableBody, TableCell } from "@/components/ui/table";
-import { ArrowLeft, CheckCircle2, AlertTriangle, FileDown, Search, Loader2 } from "lucide-react";
+import { ArrowLeft, CheckCircle2, AlertTriangle, FileDown, Search, Loader2, ArrowUp, ArrowDown, ChevronsUpDown } from "lucide-react";
+import { cn } from "@/lib/utils";
 import { toast } from "sonner";
 import { money, fmtDate } from "./lib/format";
 import { renderReconciliationPdf, type ReconReportData } from "./lib/reconciliationPdf";
 
+/** Clickable, sortable column header for the reconciliation table. */
+function SortHead({ col, label, sort, onSort, align }: {
+  col: string; label: string;
+  sort: { col: string; dir: "asc" | "desc" };
+  onSort: (col: any) => void;
+  align?: "right";
+}) {
+  const activeCol = sort.col === col;
+  return (
+    <TableHead className={cn("cursor-pointer select-none", align === "right" && "text-right")} onClick={() => onSort(col)}>
+      <span className={cn("inline-flex items-center gap-1", align === "right" && "flex-row-reverse")}>
+        {label}
+        {activeCol ? (sort.dir === "asc" ? <ArrowUp className="h-3.5 w-3.5" /> : <ArrowDown className="h-3.5 w-3.5" />)
+          : <ChevronsUpDown className="h-3.5 w-3.5 text-muted-foreground/50" />}
+      </span>
+    </TableHead>
+  );
+}
+
 type Tx = {
   id: string;
   date: string;
@@ -56,6 +76,10 @@ export default function AccountingReconcileDetailPage() {
   const [search, setSearch] = useState("");
   const [filter, setFilter] = useState<"all" | "deposits" | "withdrawals">("all");
   const [checked, setChecked] = useState<Set<string>>(new Set());
+  type SortCol = "date" | "description" | "reference" | "deposit" | "withdrawal";
+  const [sort, setSort] = useState<{ col: SortCol; dir: "asc" | "desc" }>({ col: "date", dir: "asc" });
+  const toggleSort = (col: SortCol) =>
+    setSort((s) => (s.col === col ? { col, dir: s.dir === "asc" ? "desc" : "asc" } : { col, dir: "asc" }));
 
   const [successOpen, setSuccessOpen] = useState(false);
   const [successData, setSuccessData] = useState<ReconReportData | null>(null);
@@ -85,6 +109,10 @@ export default function AccountingReconcileDetailPage() {
 
   const lastCompleted = (history as any[]).find((h: any) => h.status === "completed");
   const openingBalance = active?.opening_balance ?? Number(lastCompleted?.statement_balance ?? 0);
+  // The period being reconciled opens the day AFTER the last completed
+  // reconciliation. Transactions on/before that date belong to a closed period
+  // and must not reappear in a new reconciliation.
+  const priorReconDate: string | null = lastCompleted?.statement_end_date ?? null;
 
   const { data: allAccounts = [] } = useQuery({
     queryKey: ["accounts", cid],
@@ -94,16 +122,18 @@ export default function AccountingReconcileDetailPage() {
   });
 
   const { data: txs = [] } = useQuery({
-    queryKey: ["recon-txs", accountId, active?.statement_end_date],
+    queryKey: ["recon-txs", accountId, active?.statement_end_date, priorReconDate],
     enabled: !!accountId && !!active,
     queryFn: async () => {
-      const { data } = await accounting
+      let q = accounting
         .from("transactions")
         .select("id,date,description,reference,amount,type,cleared,reconciliation_id")
         .eq("account_id", accountId)
         .is("reconciliation_id", null)
-        .lte("date", active!.statement_end_date)
-        .order("date");
+        .lte("date", active!.statement_end_date);
+      // Only this period: skip anything already covered by the last reconciliation.
+      if (priorReconDate) q = q.gt("date", priorReconDate);
+      const { data } = await q.order("date");
       return (data ?? []) as Tx[];
     },
   });
@@ -117,13 +147,29 @@ export default function AccountingReconcileDetailPage() {
 
   const filtered = useMemo(() => {
     const s = search.toLowerCase().trim();
-    return (txs as Tx[]).filter((t) => {
+    const rows = (txs as Tx[]).filter((t) => {
       if (filter === "deposits" && t.type !== "credit") return false;
       if (filter === "withdrawals" && t.type !== "debit") return false;
       if (s && !`${t.description} ${t.reference ?? ""}`.toLowerCase().includes(s)) return false;
       return true;
     });
-  }, [txs, search, filter]);
+    const dir = sort.dir === "asc" ? 1 : -1;
+    const key = (t: Tx): string | number => {
+      switch (sort.col) {
+        case "date": return t.date ?? "";
+        case "description": return (t.description ?? "").toLowerCase();
+        case "reference": return (t.reference ?? "").toLowerCase();
+        case "deposit": return t.type === "credit" ? Number(t.amount) : -Infinity;
+        case "withdrawal": return t.type === "debit" ? Number(t.amount) : -Infinity;
+      }
+    };
+    return [...rows].sort((a, b) => {
+      const ka = key(a), kb = key(b);
+      if (ka < kb) return -1 * dir;
+      if (ka > kb) return 1 * dir;
+      return 0;
+    });
+  }, [txs, search, filter, sort]);
 
   const clearedDeposits = useMemo(
     () => (txs as Tx[]).filter((t) => checked.has(t.id) && t.type === "credit")
@@ -336,11 +382,11 @@ export default function AccountingReconcileDetailPage() {
                         onCheckedChange={(v) => toggleAll(!!v)}
                       />
                     </TableHead>
-                    <TableHead>Date</TableHead>
-                    <TableHead>Description</TableHead>
-                    <TableHead>Ref #</TableHead>
-                    <TableHead className="text-right">Deposit</TableHead>
-                    <TableHead className="text-right">Withdrawal</TableHead>
+                    <SortHead col="date" label="Date" sort={sort} onSort={toggleSort} />
+                    <SortHead col="description" label="Description" sort={sort} onSort={toggleSort} />
+                    <SortHead col="reference" label="Ref #" sort={sort} onSort={toggleSort} />
+                    <SortHead col="deposit" label="Deposit" sort={sort} onSort={toggleSort} align="right" />
+                    <SortHead col="withdrawal" label="Withdrawal" sort={sort} onSort={toggleSort} align="right" />
                   </TableRow>
                 </TableHeader>
                 <TableBody>