diff --git a/action.php b/action.php
index 6c0a4e6..54e85c5 100644
--- a/action.php
+++ b/action.php
@@ -312,6 +312,52 @@ switch ($VARS['action']) {
             exit(json_encode(["status" => "OK", "txid" => $oktx]));
         }
         break;
+    case "delete_transaction":
+        header("Content-Type: application/json");
+        $error = null;
+        if (isset($VARS['txid']) && $database->has('transactions', ['txid' => $VARS['txid']])) {
+            $txid = $VARS['txid'];
+            $cashid = $database->get('transactions', 'cashid', ['txid' => $txid]);
+            if (!$database->has('cash_drawer', ['AND' => ['cashid' => $cashid, 'close' => null]])) {
+                $error = lang("cash already closed", false);
+            }
+
+            $database->action(function ($database) {
+                global $VARS, $binstack, $error, $txid;
+
+                // Delete payments
+                $payments = $database->select('payments', ['payid', 'amount', 'type', 'certid'], ['txid' => $txid]);
+                foreach ($payments as $p) {
+                    // Reset gift card balances
+                    if (!is_null($p['certid'])) {
+                        $database->update('certificates', ['amount[+]' => $p['amount']], ['certid' => $p['certid']]);
+                    }
+                    $database->delete('payments', ['payid' => $p['payid']]);
+                }
+
+                // Delete items/lines
+                $items = $database->select('lines', ['itemid (id)', 'qty', 'lineid'], ['txid' => $txid]);
+                foreach ($items as $i) {
+                    $database->delete('lines', ['lineid' => $i['lineid']]);
+                    $binstack->update('items', [
+                        'qty[+]' => $i['qty']
+                            ], [
+                        'itemid' => $i['id']
+                    ]);
+                }
+
+                // Delete transaction
+                $database->delete('transactions', ['txid' => $txid, 'LIMIT' => 1]);
+            });
+        } else {
+            $error = lang("invalid parameters", false);
+        }
+        if (!is_null($error)) {
+            exit(json_encode(["status" => "ERROR", "message" => $error]));
+        } else {
+            exit(json_encode(["status" => "OK"]));
+        }
+        break;
     case "getreceipt":
         require_once __DIR__ . "/lib/generatereceipt.php";
         $format = "html";
diff --git a/static/js/pos.js b/static/js/pos.js
index e48a3f7..8e372cc 100644
--- a/static/js/pos.js
+++ b/static/js/pos.js
@@ -58,7 +58,24 @@ function recalculate() {
 
 $("#deletetxbtn").click(function () {
     bsalert("Confirm", "Really delete transaction?", "Yes", "No", function () {
-        window.location.href = "app.php?page=pos";
+        if ($("#txid").length) {
+            $.post("action.php", {
+                action: "delete_transaction",
+                txid: $("#txid").val()
+            }, function (data) {
+                console.log(data);
+                console.log(data.status == "OK");
+                if (data.status == "OK") {
+                    window.location.href = "app.php?page=pos";
+                } else {
+                    bsalert("Error", data.message);
+                }
+            }).fail(function () {
+                bsalert("Error", "An unknown error occurred.");
+            });
+        } else {
+            window.location.href = "app.php?page=pos";
+        }
     });
 });