diff --git a/Admin/Install/Navigation.install.json b/Admin/Install/Navigation.install.json
index 996eb02..e4604ae 100755
--- a/Admin/Install/Navigation.install.json
+++ b/Admin/Install/Navigation.install.json
@@ -13,6 +13,98 @@
         "permission": { "permission": 2, "category": null, "element": null },
         "parent": 0,
         "children": [
+            {
+                "id": 1008102001,
+                "pid": "/",
+                "type": 2,
+                "subtype": 1,
+                "name": "TaxCodes",
+                "uri": "{/base}/finance/tax/code/list?{?}",
+                "target": "self",
+                "icon": null,
+                "order": 1,
+                "from": "Finance",
+                "permission": { "permission": 2, "category": null, "element": null },
+                "parent": 1008101001,
+                "children": [
+                    {
+                        "id": 1008102002,
+                        "pid": "/finance/tax/code",
+                        "type": 3,
+                        "subtype": 1,
+                        "name": "List",
+                        "uri": "{/base}/finance/tax/code/list?{?}",
+                        "target": "self",
+                        "icon": null,
+                        "order": 1,
+                        "from": "Finance",
+                        "permission": { "permission": 2, "category": null, "element": null },
+                        "parent": 1008102001,
+                        "children": []
+                    },
+                    {
+                        "id": 1008102003,
+                        "pid": "/finance/tax/code",
+                        "type": 3,
+                        "subtype": 1,
+                        "name": "Create",
+                        "uri": "{/base}/finance/tax/code/create?{?}",
+                        "target": "self",
+                        "icon": null,
+                        "order": 5,
+                        "from": "Finance",
+                        "permission": { "permission": 2, "category": null, "element": null },
+                        "parent": 1008102001,
+                        "children": []
+                    }
+                ]
+            },
+            {
+                "id": 1008103001,
+                "pid": "/",
+                "type": 2,
+                "subtype": 1,
+                "name": "TaxCombinations",
+                "uri": "{/base}/finance/tax/combination/list?{?}",
+                "target": "self",
+                "icon": null,
+                "order": 2,
+                "from": "Finance",
+                "permission": { "permission": 2, "category": null, "element": null },
+                "parent": 1008101001,
+                "children": [
+                    {
+                        "id": 1008103002,
+                        "pid": "/finance/tax/combination",
+                        "type": 3,
+                        "subtype": 1,
+                        "name": "List",
+                        "uri": "{/base}/finance/tax/combination/list?{?}",
+                        "target": "self",
+                        "icon": null,
+                        "order": 1,
+                        "from": "Finance",
+                        "permission": { "permission": 2, "category": null, "element": null },
+                        "parent": 1008103001,
+                        "children": []
+                    },
+                    {
+                        "id": 1008103003,
+                        "pid": "/finance/tax/combination",
+                        "type": 3,
+                        "subtype": 1,
+                        "name": "Create",
+                        "uri": "{/base}/finance/tax/combination/create?{?}",
+                        "target": "self",
+                        "icon": null,
+                        "order": 5,
+                        "from": "Finance",
+                        "permission": { "permission": 2, "category": null, "element": null },
+                        "parent": 1008103001,
+                        "children": []
+                    }
+                ]
+            }
         ]
     }
 ]
diff --git a/Admin/Routes/Web/Backend.php b/Admin/Routes/Web/Backend.php
index a431b9b..a27ab72 100755
--- a/Admin/Routes/Web/Backend.php
+++ b/Admin/Routes/Web/Backend.php
@@ -29,4 +29,48 @@ return [
             ],
         ],
     ],
+    '^.*/finance/tax/code/list(\?.*$|$)' => [
+        [
+            'dest'       => '\Modules\Finance\Controller\BackendController:viewTaxList',
+            'verb'       => RouteVerb::GET,
+            'permission' => [
+                'module' => BackendController::NAME,
+                'type'   => PermissionType::CREATE,
+                'state'  => PermissionCategory::TAX,
+            ],
+        ],
+    ],
+    '^.*/finance/tax/code/create(\?.*$|$)' => [
+        [
+            'dest'       => '\Modules\Finance\Controller\BackendController:viewTaxCreate',
+            'verb'       => RouteVerb::GET,
+            'permission' => [
+                'module' => BackendController::NAME,
+                'type'   => PermissionType::CREATE,
+                'state'  => PermissionCategory::TAX,
+            ],
+        ],
+    ],
+    '^.*/finance/tax/combination/list(\?.*$|$)' => [
+        [
+            'dest'       => '\Modules\Finance\Controller\BackendController:viewCombinationList',
+            'verb'       => RouteVerb::GET,
+            'permission' => [
+                'module' => BackendController::NAME,
+                'type'   => PermissionType::CREATE,
+                'state'  => PermissionCategory::TAX,
+            ],
+        ],
+    ],
+    '^.*/finance/tax/combination/create(\?.*$|$)' => [
+        [
+            'dest'       => '\Modules\Finance\Controller\BackendController:viewCombinationCreate',
+            'verb'       => RouteVerb::GET,
+            'permission' => [
+                'module' => BackendController::NAME,
+                'type'   => PermissionType::CREATE,
+                'state'  => PermissionCategory::TAX,
+            ],
+        ],
+    ],
 ];
diff --git a/Models/PermissionCategory.php b/Models/PermissionCategory.php
index 49dc339..3804f56 100755
--- a/Models/PermissionCategory.php
+++ b/Models/PermissionCategory.php
@@ -29,4 +29,6 @@ abstract class PermissionCategory extends Enum
     public const ARCHIVE = 1;
 
     public const ANALYSIS = 2;
+
+    public const TAX = 3;
 }
diff --git a/Models/TaxCode.php b/Models/TaxCode.php
index 84a1f1e..0bcb769 100755
--- a/Models/TaxCode.php
+++ b/Models/TaxCode.php
@@ -40,6 +40,14 @@ class TaxCode implements \JsonSerializable
 
     public int $percentageInput = 0;
 
+    // Tax accounts can be defined in:
+    //      1. Account (gross postings are automatically split)
+    //      2. Tax code
+    //      3. Tax combination
+    public ?int $taxAccount1 = null;
+
+    public ?int $taxAccount2 = null;
+
     /**
      * Localization.
      *