diff --git a/app/Enums/TransactionTypeEnum.php b/app/Enums/TransactionTypeEnum.php
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+++ b/app/Enums/TransactionTypeEnum.php
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+<?php
+/*
+ * TransactionTypeEnum.php
+ * Copyright (c) 2022 james@firefly-iii.org
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace FireflyIII\Enums;
+
+/**
+ * Class TransactionTypeEnum
+ */
+enum TransactionTypeEnum: string
+{
+    case DEPOSIT = 'Deposit';
+    case INVALID = 'Invalid';
+    case LIABILITY_CREDIT = 'Liability credit';
+    case OPENING_BALANCE = 'Opening balance';
+    case RECONCILIATION = 'Reconciliation';
+    case TRANSFER = 'Transfer';
+    case WITHDRAWAL = 'Withdrawal';
+}
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