diff --git a/docs/v1/payroll-uk/index.html b/docs/v1/payroll-uk/index.html
index 342c1cd0..abc24a99 100644
--- a/docs/v1/payroll-uk/index.html
+++ b/docs/v1/payroll-uk/index.html
@@ -1595,6 +1595,16 @@
       "format" : "date-time",
       "x-is-datetime" : true
     },
+    "niCategory" : {
+      "$ref" : "#/components/schemas/NICategoryLetter"
+    },
+    "niCategories" : {
+      "type" : "array",
+      "description" : "The employee's NI categories",
+      "items" : {
+        "$ref" : "#/components/schemas/NICategory"
+      }
+    },
     "nationalInsuranceNumber" : {
       "type" : "string",
       "description" : "National insurance number of the employee",
@@ -2262,7 +2272,7 @@
 };
       defs["Employment"] = {
   "title" : "",
-  "required" : [ "EmployeeNumber", "NICategory", "PayrollCalendarID", "StartDate" ],
+  "required" : [ "EmployeeNumber", "NICategories", "PayrollCalendarID", "StartDate" ],
   "type" : "object",
   "properties" : {
     "payrollCalendarID" : {
@@ -2282,10 +2292,14 @@
       "example" : "7"
     },
     "niCategory" : {
-      "type" : "string",
-      "description" : "The NI Category of the employee",
-      "example" : "A",
-      "enum" : [ "A", "B", "C", "F", "H", "I", "J", "L", "M", "S", "V", "X", "Z" ]
+      "$ref" : "#/components/schemas/NICategoryLetter"
+    },
+    "niCategories" : {
+      "type" : "array",
+      "description" : "The employee's NI categories",
+      "items" : {
+        "$ref" : "#/components/schemas/NICategory"
+      }
     }
   },
   "description" : ""
@@ -2502,6 +2516,75 @@
     }
   },
   "description" : ""
+};
+      defs["NICategory"] = {
+  "title" : "",
+  "required" : [ "niCategory", "workplacePostcode" ],
+  "type" : "object",
+  "properties" : {
+    "startDate" : {
+      "type" : "string",
+      "description" : "The start date of the NI category (YYYY-MM-DD)",
+      "format" : "date",
+      "example" : "2024-12-02",
+      "x-is-date" : true
+    },
+    "niCategory" : {
+      "$ref" : "#/components/schemas/NICategoryLetter"
+    },
+    "niCategoryID" : {
+      "type" : "number",
+      "description" : "Xero unique identifier for the NI category",
+      "example" : 15
+    },
+    "dateFirstEmployedAsCivilian" : {
+      "type" : "string",
+      "description" : "The date in which the employee was first employed as a civilian (YYYY-MM-DD)",
+      "format" : "date",
+      "example" : "2024-12-02",
+      "x-is-date" : true
+    },
+    "workplacePostcode" : {
+      "type" : "string",
+      "description" : "The workplace postcode",
+      "example" : "SW1A 1AA"
+    }
+  },
+  "description" : "",
+  "oneOf" : [ {
+    "$ref" : "#/components/schemas/NICategory_oneOf"
+  }, {
+    "$ref" : "#/components/schemas/NICategory_oneOf_1"
+  } ]
+};
+      defs["NICategoryLetter"] = {
+  "title" : "",
+  "type" : "string",
+  "description" : "The employee's NI Category letter.",
+  "example" : "I",
+  "enum" : [ "A", "B", "C", "D", "E", "F", "H", "I", "J", "K", "L", "M", "N", "S", "V", "X", "Z" ]
+};
+      defs["NICategory_oneOf"] = {
+  "title" : "",
+  "required" : [ "workplacePostcode" ],
+  "properties" : {
+    "niCategory" : {
+      "type" : "string",
+      "enum" : [ "F", "I", "L", "S", "N", "E", "D", "K" ]
+    }
+  },
+  "description" : ""
+};
+      defs["NICategory_oneOf_1"] = {
+  "title" : "",
+  "required" : [ "dateFirstEmployedAsCivilian" ],
+  "properties" : {
+    "niCategory" : {
+      "type" : "string",
+      "enum" : [ "V" ]
+    }
+  },
+  "description" : ""
 };
       defs["Pagination"] = {
   "title" : "",
@@ -5846,6 +5929,8 @@ <h3>Usage and SDK Samples</h3>
     employment = Employment(
         payroll_calendar_id = "00000000-0000-0000-0000-000000000000",
         start_date = start_date)
+
+    ni_categories = NICategories(
     
     try:
         api_response = api_instance.create_employment(xero_tenant_id, employee_id, employment, idempotency_key)
@@ -5976,7 +6061,7 @@ <h2>Parameters</h2>
       "schema" : {
         "$ref" : "#/components/schemas/Employment"
       },
-      "example" : "{ \"PayrollCalendarID\": \"216d80e6-af55-47b1-b718-9457c3f5d2fe\", \"StartDate\": \"2020-04-01\", \"EmployeeNumber\": \"123ABC\", \"NICategory\": \"A\" }"
+      "example" : "{ \"PayrollCalendarID\": \"216d80e6-af55-47b1-b718-9457c3f5d2fe\", \"StartDate\": \"2020-04-01\", \"NICategories\": [ { \"NICategory\": \"A\", \"StartDate\": \"2020-05-01\" } ], \"EmployeeNumber\": \"123ABC\" }"
     }
   },
   "required" : true
diff --git a/xero_python/payrolluk/__init__.py b/xero_python/payrolluk/__init__.py
index 05497b10..2a170048 100644
--- a/xero_python/payrolluk/__init__.py
+++ b/xero_python/payrolluk/__init__.py
@@ -96,6 +96,10 @@
 from xero_python.payrolluk.models.leave_type import LeaveType
 from xero_python.payrolluk.models.leave_type_object import LeaveTypeObject
 from xero_python.payrolluk.models.leave_types import LeaveTypes
+from xero_python.payrolluk.models.ni_category import NICategory
+from xero_python.payrolluk.models.ni_category_letter import NICategoryLetter
+from xero_python.payrolluk.models.ni_category_one_of import NICategoryOneOf
+from xero_python.payrolluk.models.ni_category_one_of1 import NICategoryOneOf1
 from xero_python.payrolluk.models.pagination import Pagination
 from xero_python.payrolluk.models.pay_run import PayRun
 from xero_python.payrolluk.models.pay_run_calendar import PayRunCalendar
diff --git a/xero_python/payrolluk/docs/Employee.md b/xero_python/payrolluk/docs/Employee.md
index 1e709554..ccbab019 100644
--- a/xero_python/payrolluk/docs/Employee.md
+++ b/xero_python/payrolluk/docs/Employee.md
@@ -17,6 +17,8 @@ Name | Type | Description | Notes
 **payroll_calendar_id** | **str** | Xero unique identifier for the payroll calendar of the employee | [optional] 
 **updated_date_utc** | **datetime** | UTC timestamp of last update to the employee | [optional] 
 **created_date_utc** | **datetime** | UTC timestamp when the employee was created in Xero | [optional] 
+**ni_category** | [**NICategoryLetter**](NICategoryLetter.md) |  | [optional] 
+**ni_categories** | [**list[NICategory]**](NICategory.md) | The employee&#39;s NI categories | [optional] 
 **national_insurance_number** | **str** | National insurance number of the employee | [optional] 
 **is_off_payroll_worker** | **bool** | Whether the employee is an off payroll worker | [optional] 
 
diff --git a/xero_python/payrolluk/docs/Employment.md b/xero_python/payrolluk/docs/Employment.md
index 596e2c8b..3a364df2 100644
--- a/xero_python/payrolluk/docs/Employment.md
+++ b/xero_python/payrolluk/docs/Employment.md
@@ -6,7 +6,8 @@ Name | Type | Description | Notes
 **payroll_calendar_id** | **str** | Xero unique identifier for the payroll calendar of the employee | [optional] 
 **start_date** | **date** | Start date of the employment (YYYY-MM-DD) | [optional] 
 **employee_number** | **str** | The employment number of the employee | [optional] 
-**ni_category** | **str** | The NI Category of the employee | [optional] 
+**ni_category** | [**NICategoryLetter**](NICategoryLetter.md) |  | [optional] 
+**ni_categories** | [**list[NICategory]**](NICategory.md) | The employee&#39;s NI categories | [optional] 
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
 
diff --git a/xero_python/payrolluk/docs/NICategory.md b/xero_python/payrolluk/docs/NICategory.md
new file mode 100644
index 00000000..a6e44ac7
--- /dev/null
+++ b/xero_python/payrolluk/docs/NICategory.md
@@ -0,0 +1,14 @@
+# NICategory
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**start_date** | **date** | The start date of the NI category (YYYY-MM-DD) | [optional] 
+**ni_category** | [**NICategoryLetter**](NICategoryLetter.md) |  | 
+**ni_category_id** | **float** | Xero unique identifier for the NI category | [optional] 
+**date_first_employed_as_civilian** | **date** | The date in which the employee was first employed as a civilian (YYYY-MM-DD) | [optional] 
+**workplace_postcode** | **str** | The workplace postcode | 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+
diff --git a/xero_python/payrolluk/docs/NICategoryLetter.md b/xero_python/payrolluk/docs/NICategoryLetter.md
new file mode 100644
index 00000000..971bdc23
--- /dev/null
+++ b/xero_python/payrolluk/docs/NICategoryLetter.md
@@ -0,0 +1,9 @@
+# NICategoryLetter
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+
diff --git a/xero_python/payrolluk/docs/NICategoryOneOf.md b/xero_python/payrolluk/docs/NICategoryOneOf.md
new file mode 100644
index 00000000..3157451c
--- /dev/null
+++ b/xero_python/payrolluk/docs/NICategoryOneOf.md
@@ -0,0 +1,10 @@
+# NICategoryOneOf
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**ni_category** | **str** |  | [optional] 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+
diff --git a/xero_python/payrolluk/docs/NICategoryOneOf1.md b/xero_python/payrolluk/docs/NICategoryOneOf1.md
new file mode 100644
index 00000000..1a2cc3a4
--- /dev/null
+++ b/xero_python/payrolluk/docs/NICategoryOneOf1.md
@@ -0,0 +1,10 @@
+# NICategoryOneOf1
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**ni_category** | **str** |  | [optional] 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+
diff --git a/xero_python/payrolluk/docs/PayrollUkApi.md b/xero_python/payrolluk/docs/PayrollUkApi.md
index e2c0621b..9f8e4fce 100644
--- a/xero_python/payrolluk/docs/PayrollUkApi.md
+++ b/xero_python/payrolluk/docs/PayrollUkApi.md
@@ -901,7 +901,7 @@ api_instance = PayrollUkApi(api_client)
 
 xero_tenant_id = 'xero_tenant_id_example' # str | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # str | Employee id for single object
-employment = { "PayrollCalendarID": "216d80e6-af55-47b1-b718-9457c3f5d2fe", "StartDate": "2020-04-01", "EmployeeNumber": "123ABC", "NICategory": "A" } # Employment | 
+employment = { "PayrollCalendarID": "216d80e6-af55-47b1-b718-9457c3f5d2fe", "StartDate": "2020-04-01", "NICategories": [ { "NICategory": "A", "StartDate": "2020-05-01" } ], "EmployeeNumber": "123ABC" } # Employment | 
 idempotency_key = 'KEY_VALUE' # str | This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
 try:
     # Creates employment detail for a specific employee using a unique employee ID
diff --git a/xero_python/payrolluk/models/__init__.py b/xero_python/payrolluk/models/__init__.py
index ad69d57c..f2954781 100644
--- a/xero_python/payrolluk/models/__init__.py
+++ b/xero_python/payrolluk/models/__init__.py
@@ -91,6 +91,10 @@
 from xero_python.payrolluk.models.leave_type import LeaveType
 from xero_python.payrolluk.models.leave_type_object import LeaveTypeObject
 from xero_python.payrolluk.models.leave_types import LeaveTypes
+from xero_python.payrolluk.models.ni_category import NICategory
+from xero_python.payrolluk.models.ni_category_letter import NICategoryLetter
+from xero_python.payrolluk.models.ni_category_one_of import NICategoryOneOf
+from xero_python.payrolluk.models.ni_category_one_of1 import NICategoryOneOf1
 from xero_python.payrolluk.models.pagination import Pagination
 from xero_python.payrolluk.models.pay_run import PayRun
 from xero_python.payrolluk.models.pay_run_calendar import PayRunCalendar
diff --git a/xero_python/payrolluk/models/employee.py b/xero_python/payrolluk/models/employee.py
index 6cfe8136..cd5fa99f 100644
--- a/xero_python/payrolluk/models/employee.py
+++ b/xero_python/payrolluk/models/employee.py
@@ -44,6 +44,8 @@ class Employee(BaseModel):
         "payroll_calendar_id": "str",
         "updated_date_utc": "datetime",
         "created_date_utc": "datetime",
+        "ni_category": "NICategoryLetter",
+        "ni_categories": "list[NICategory]",
         "national_insurance_number": "str",
         "is_off_payroll_worker": "bool",
     }
@@ -63,6 +65,8 @@ class Employee(BaseModel):
         "payroll_calendar_id": "payrollCalendarID",
         "updated_date_utc": "updatedDateUTC",
         "created_date_utc": "createdDateUTC",
+        "ni_category": "niCategory",
+        "ni_categories": "niCategories",
         "national_insurance_number": "nationalInsuranceNumber",
         "is_off_payroll_worker": "isOffPayrollWorker",
     }
@@ -83,6 +87,8 @@ def __init__(
         payroll_calendar_id=None,
         updated_date_utc=None,
         created_date_utc=None,
+        ni_category=None,
+        ni_categories=None,
         national_insurance_number=None,
         is_off_payroll_worker=None,
     ):  # noqa: E501
@@ -102,6 +108,8 @@ def __init__(
         self._payroll_calendar_id = None
         self._updated_date_utc = None
         self._created_date_utc = None
+        self._ni_category = None
+        self._ni_categories = None
         self._national_insurance_number = None
         self._is_off_payroll_worker = None
         self.discriminator = None
@@ -134,6 +142,10 @@ def __init__(
             self.updated_date_utc = updated_date_utc
         if created_date_utc is not None:
             self.created_date_utc = created_date_utc
+        if ni_category is not None:
+            self.ni_category = ni_category
+        if ni_categories is not None:
+            self.ni_categories = ni_categories
         if national_insurance_number is not None:
             self.national_insurance_number = national_insurance_number
         if is_off_payroll_worker is not None:
@@ -468,6 +480,50 @@ def created_date_utc(self, created_date_utc):
 
         self._created_date_utc = created_date_utc
 
+    @property
+    def ni_category(self):
+        """Gets the ni_category of this Employee.  # noqa: E501
+
+
+        :return: The ni_category of this Employee.  # noqa: E501
+        :rtype: NICategoryLetter
+        """
+        return self._ni_category
+
+    @ni_category.setter
+    def ni_category(self, ni_category):
+        """Sets the ni_category of this Employee.
+
+
+        :param ni_category: The ni_category of this Employee.  # noqa: E501
+        :type: NICategoryLetter
+        """
+
+        self._ni_category = ni_category
+
+    @property
+    def ni_categories(self):
+        """Gets the ni_categories of this Employee.  # noqa: E501
+
+        The employee's NI categories  # noqa: E501
+
+        :return: The ni_categories of this Employee.  # noqa: E501
+        :rtype: list[NICategory]
+        """
+        return self._ni_categories
+
+    @ni_categories.setter
+    def ni_categories(self, ni_categories):
+        """Sets the ni_categories of this Employee.
+
+        The employee's NI categories  # noqa: E501
+
+        :param ni_categories: The ni_categories of this Employee.  # noqa: E501
+        :type: list[NICategory]
+        """
+
+        self._ni_categories = ni_categories
+
     @property
     def national_insurance_number(self):
         """Gets the national_insurance_number of this Employee.  # noqa: E501
diff --git a/xero_python/payrolluk/models/employment.py b/xero_python/payrolluk/models/employment.py
index 4649bc3e..55318420 100644
--- a/xero_python/payrolluk/models/employment.py
+++ b/xero_python/payrolluk/models/employment.py
@@ -33,7 +33,8 @@ class Employment(BaseModel):
         "payroll_calendar_id": "str",
         "start_date": "date",
         "employee_number": "str",
-        "ni_category": "str",
+        "ni_category": "NICategoryLetter",
+        "ni_categories": "list[NICategory]",
     }
 
     attribute_map = {
@@ -41,6 +42,7 @@ class Employment(BaseModel):
         "start_date": "startDate",
         "employee_number": "employeeNumber",
         "ni_category": "niCategory",
+        "ni_categories": "niCategories",
     }
 
     def __init__(
@@ -49,6 +51,7 @@ def __init__(
         start_date=None,
         employee_number=None,
         ni_category=None,
+        ni_categories=None,
     ):  # noqa: E501
         """Employment - a model defined in OpenAPI"""  # noqa: E501
 
@@ -56,6 +59,7 @@ def __init__(
         self._start_date = None
         self._employee_number = None
         self._ni_category = None
+        self._ni_categories = None
         self.discriminator = None
 
         if payroll_calendar_id is not None:
@@ -66,6 +70,8 @@ def __init__(
             self.employee_number = employee_number
         if ni_category is not None:
             self.ni_category = ni_category
+        if ni_categories is not None:
+            self.ni_categories = ni_categories
 
     @property
     def payroll_calendar_id(self):
@@ -140,10 +146,9 @@ def employee_number(self, employee_number):
     def ni_category(self):
         """Gets the ni_category of this Employment.  # noqa: E501
 
-        The NI Category of the employee  # noqa: E501
 
         :return: The ni_category of this Employment.  # noqa: E501
-        :rtype: str
+        :rtype: NICategoryLetter
         """
         return self._ni_category
 
@@ -151,34 +156,32 @@ def ni_category(self):
     def ni_category(self, ni_category):
         """Sets the ni_category of this Employment.
 
-        The NI Category of the employee  # noqa: E501
 
         :param ni_category: The ni_category of this Employment.  # noqa: E501
-        :type: str
+        :type: NICategoryLetter
         """
-        allowed_values = [
-            "A",
-            "B",
-            "C",
-            "F",
-            "H",
-            "I",
-            "J",
-            "L",
-            "M",
-            "S",
-            "V",
-            "X",
-            "Z",
-            "None",
-        ]  # noqa: E501
-
-        if ni_category:
-            if ni_category not in allowed_values:
-                raise ValueError(
-                    "Invalid value for `ni_category` ({0}), must be one of {1}".format(  # noqa: E501
-                        ni_category, allowed_values
-                    )
-                )
 
         self._ni_category = ni_category
+
+    @property
+    def ni_categories(self):
+        """Gets the ni_categories of this Employment.  # noqa: E501
+
+        The employee's NI categories  # noqa: E501
+
+        :return: The ni_categories of this Employment.  # noqa: E501
+        :rtype: list[NICategory]
+        """
+        return self._ni_categories
+
+    @ni_categories.setter
+    def ni_categories(self, ni_categories):
+        """Sets the ni_categories of this Employment.
+
+        The employee's NI categories  # noqa: E501
+
+        :param ni_categories: The ni_categories of this Employment.  # noqa: E501
+        :type: list[NICategory]
+        """
+
+        self._ni_categories = ni_categories
diff --git a/xero_python/payrolluk/models/ni_category.py b/xero_python/payrolluk/models/ni_category.py
new file mode 100644
index 00000000..3d35a7d8
--- /dev/null
+++ b/xero_python/payrolluk/models/ni_category.py
@@ -0,0 +1,193 @@
+# coding: utf-8
+
+"""
+    Xero Payroll UK
+
+    This is the Xero Payroll API for orgs in the UK region.  # noqa: E501
+
+    Contact: api@xero.com
+    Generated by: https://openapi-generator.tech
+"""
+
+
+import re  # noqa: F401
+
+from xero_python.models import BaseModel
+
+
+class NICategory(BaseModel):
+    """NOTE: This class is auto generated by OpenAPI Generator.
+    Ref: https://openapi-generator.tech
+
+    Do not edit the class manually.
+    """
+
+    """
+    Attributes:
+      openapi_types (dict): The key is attribute name
+                            and the value is attribute type.
+      attribute_map (dict): The key is attribute name
+                            and the value is json key in definition.
+    """
+    openapi_types = {
+        "start_date": "date",
+        "ni_category": "NICategoryLetter",
+        "ni_category_id": "float",
+        "date_first_employed_as_civilian": "date",
+        "workplace_postcode": "str",
+    }
+
+    attribute_map = {
+        "start_date": "startDate",
+        "ni_category": "niCategory",
+        "ni_category_id": "niCategoryID",
+        "date_first_employed_as_civilian": "dateFirstEmployedAsCivilian",
+        "workplace_postcode": "workplacePostcode",
+    }
+
+    def __init__(
+        self,
+        start_date=None,
+        ni_category=None,
+        ni_category_id=None,
+        date_first_employed_as_civilian=None,
+        workplace_postcode=None,
+    ):  # noqa: E501
+        """NICategory - a model defined in OpenAPI"""  # noqa: E501
+
+        self._start_date = None
+        self._ni_category = None
+        self._ni_category_id = None
+        self._date_first_employed_as_civilian = None
+        self._workplace_postcode = None
+        self.discriminator = None
+
+        if start_date is not None:
+            self.start_date = start_date
+        self.ni_category = ni_category
+        if ni_category_id is not None:
+            self.ni_category_id = ni_category_id
+        if date_first_employed_as_civilian is not None:
+            self.date_first_employed_as_civilian = date_first_employed_as_civilian
+        self.workplace_postcode = workplace_postcode
+
+    @property
+    def start_date(self):
+        """Gets the start_date of this NICategory.  # noqa: E501
+
+        The start date of the NI category (YYYY-MM-DD)  # noqa: E501
+
+        :return: The start_date of this NICategory.  # noqa: E501
+        :rtype: date
+        """
+        return self._start_date
+
+    @start_date.setter
+    def start_date(self, start_date):
+        """Sets the start_date of this NICategory.
+
+        The start date of the NI category (YYYY-MM-DD)  # noqa: E501
+
+        :param start_date: The start_date of this NICategory.  # noqa: E501
+        :type: date
+        """
+
+        self._start_date = start_date
+
+    @property
+    def ni_category(self):
+        """Gets the ni_category of this NICategory.  # noqa: E501
+
+
+        :return: The ni_category of this NICategory.  # noqa: E501
+        :rtype: NICategoryLetter
+        """
+        return self._ni_category
+
+    @ni_category.setter
+    def ni_category(self, ni_category):
+        """Sets the ni_category of this NICategory.
+
+
+        :param ni_category: The ni_category of this NICategory.  # noqa: E501
+        :type: NICategoryLetter
+        """
+        if ni_category is None:
+            raise ValueError(
+                "Invalid value for `ni_category`, must not be `None`"
+            )  # noqa: E501
+
+        self._ni_category = ni_category
+
+    @property
+    def ni_category_id(self):
+        """Gets the ni_category_id of this NICategory.  # noqa: E501
+
+        Xero unique identifier for the NI category  # noqa: E501
+
+        :return: The ni_category_id of this NICategory.  # noqa: E501
+        :rtype: float
+        """
+        return self._ni_category_id
+
+    @ni_category_id.setter
+    def ni_category_id(self, ni_category_id):
+        """Sets the ni_category_id of this NICategory.
+
+        Xero unique identifier for the NI category  # noqa: E501
+
+        :param ni_category_id: The ni_category_id of this NICategory.  # noqa: E501
+        :type: float
+        """
+
+        self._ni_category_id = ni_category_id
+
+    @property
+    def date_first_employed_as_civilian(self):
+        """Gets the date_first_employed_as_civilian of this NICategory.  # noqa: E501
+
+        The date in which the employee was first employed as a civilian (YYYY-MM-DD)  # noqa: E501
+
+        :return: The date_first_employed_as_civilian of this NICategory.  # noqa: E501
+        :rtype: date
+        """
+        return self._date_first_employed_as_civilian
+
+    @date_first_employed_as_civilian.setter
+    def date_first_employed_as_civilian(self, date_first_employed_as_civilian):
+        """Sets the date_first_employed_as_civilian of this NICategory.
+
+        The date in which the employee was first employed as a civilian (YYYY-MM-DD)  # noqa: E501
+
+        :param date_first_employed_as_civilian: The date_first_employed_as_civilian of this NICategory.  # noqa: E501
+        :type: date
+        """
+
+        self._date_first_employed_as_civilian = date_first_employed_as_civilian
+
+    @property
+    def workplace_postcode(self):
+        """Gets the workplace_postcode of this NICategory.  # noqa: E501
+
+        The workplace postcode  # noqa: E501
+
+        :return: The workplace_postcode of this NICategory.  # noqa: E501
+        :rtype: str
+        """
+        return self._workplace_postcode
+
+    @workplace_postcode.setter
+    def workplace_postcode(self, workplace_postcode):
+        """Sets the workplace_postcode of this NICategory.
+
+        The workplace postcode  # noqa: E501
+
+        :param workplace_postcode: The workplace_postcode of this NICategory.  # noqa: E501
+        :type: str
+        """
+        if workplace_postcode is None:
+            raise ValueError(
+                "Invalid value for `workplace_postcode`, must not be `None`"
+            )  # noqa: E501
+
+        self._workplace_postcode = workplace_postcode
diff --git a/xero_python/payrolluk/models/ni_category_letter.py b/xero_python/payrolluk/models/ni_category_letter.py
new file mode 100644
index 00000000..ad3c1ee7
--- /dev/null
+++ b/xero_python/payrolluk/models/ni_category_letter.py
@@ -0,0 +1,43 @@
+# coding: utf-8
+
+"""
+    Xero Payroll UK
+
+    This is the Xero Payroll API for orgs in the UK region.  # noqa: E501
+
+    Contact: api@xero.com
+    Generated by: https://openapi-generator.tech
+"""
+
+
+import re  # noqa: F401
+
+from enum import Enum
+
+
+class NICategoryLetter(Enum):
+    """NOTE: This class is auto generated by OpenAPI Generator.
+    Ref: https://openapi-generator.tech
+
+    Do not edit the class manually.
+
+    allowed enum values
+    """
+
+    A = "A"
+    B = "B"
+    C = "C"
+    D = "D"
+    E = "E"
+    F = "F"
+    H = "H"
+    I = "I"
+    J = "J"
+    K = "K"
+    L = "L"
+    M = "M"
+    N = "N"
+    S = "S"
+    V = "V"
+    X = "X"
+    Z = "Z"
diff --git a/xero_python/payrolluk/models/ni_category_one_of.py b/xero_python/payrolluk/models/ni_category_one_of.py
new file mode 100644
index 00000000..e30cb161
--- /dev/null
+++ b/xero_python/payrolluk/models/ni_category_one_of.py
@@ -0,0 +1,73 @@
+# coding: utf-8
+
+"""
+    Xero Payroll UK
+
+    This is the Xero Payroll API for orgs in the UK region.  # noqa: E501
+
+    Contact: api@xero.com
+    Generated by: https://openapi-generator.tech
+"""
+
+
+import re  # noqa: F401
+
+from xero_python.models import BaseModel
+
+
+class NICategoryOneOf(BaseModel):
+    """NOTE: This class is auto generated by OpenAPI Generator.
+    Ref: https://openapi-generator.tech
+
+    Do not edit the class manually.
+    """
+
+    """
+    Attributes:
+      openapi_types (dict): The key is attribute name
+                            and the value is attribute type.
+      attribute_map (dict): The key is attribute name
+                            and the value is json key in definition.
+    """
+    openapi_types = {"ni_category": "str"}
+
+    attribute_map = {"ni_category": "niCategory"}
+
+    def __init__(self, ni_category=None):  # noqa: E501
+        """NICategoryOneOf - a model defined in OpenAPI"""  # noqa: E501
+
+        self._ni_category = None
+        self.discriminator = None
+
+        if ni_category is not None:
+            self.ni_category = ni_category
+
+    @property
+    def ni_category(self):
+        """Gets the ni_category of this NICategoryOneOf.  # noqa: E501
+
+
+        :return: The ni_category of this NICategoryOneOf.  # noqa: E501
+        :rtype: str
+        """
+        return self._ni_category
+
+    @ni_category.setter
+    def ni_category(self, ni_category):
+        """Sets the ni_category of this NICategoryOneOf.
+
+
+        :param ni_category: The ni_category of this NICategoryOneOf.  # noqa: E501
+        :type: str
+        """
+        allowed_values = ["F", "I", "L", "S", "N", "E", "D", "K", "None"]  # noqa: E501
+
+        if ni_category:
+            if ni_category not in allowed_values:
+                raise ValueError(
+                    "Invalid value for `ni_category` ({0}), must be one of {1}".format(  # noqa: E501
+                        ni_category, allowed_values
+                    )
+                )
+
+        self._ni_category = ni_category
diff --git a/xero_python/payrolluk/models/ni_category_one_of1.py b/xero_python/payrolluk/models/ni_category_one_of1.py
new file mode 100644
index 00000000..1112b756
--- /dev/null
+++ b/xero_python/payrolluk/models/ni_category_one_of1.py
@@ -0,0 +1,73 @@
+# coding: utf-8
+
+"""
+    Xero Payroll UK
+
+    This is the Xero Payroll API for orgs in the UK region.  # noqa: E501
+
+    Contact: api@xero.com
+    Generated by: https://openapi-generator.tech
+"""
+
+
+import re  # noqa: F401
+
+from xero_python.models import BaseModel
+
+
+class NICategoryOneOf1(BaseModel):
+    """NOTE: This class is auto generated by OpenAPI Generator.
+    Ref: https://openapi-generator.tech
+
+    Do not edit the class manually.
+    """
+
+    """
+    Attributes:
+      openapi_types (dict): The key is attribute name
+                            and the value is attribute type.
+      attribute_map (dict): The key is attribute name
+                            and the value is json key in definition.
+    """
+    openapi_types = {"ni_category": "str"}
+
+    attribute_map = {"ni_category": "niCategory"}
+
+    def __init__(self, ni_category=None):  # noqa: E501
+        """NICategoryOneOf1 - a model defined in OpenAPI"""  # noqa: E501
+
+        self._ni_category = None
+        self.discriminator = None
+
+        if ni_category is not None:
+            self.ni_category = ni_category
+
+    @property
+    def ni_category(self):
+        """Gets the ni_category of this NICategoryOneOf1.  # noqa: E501
+
+
+        :return: The ni_category of this NICategoryOneOf1.  # noqa: E501
+        :rtype: str
+        """
+        return self._ni_category
+
+    @ni_category.setter
+    def ni_category(self, ni_category):
+        """Sets the ni_category of this NICategoryOneOf1.
+
+
+        :param ni_category: The ni_category of this NICategoryOneOf1.  # noqa: E501
+        :type: str
+        """
+        allowed_values = ["V", "None"]  # noqa: E501
+
+        if ni_category:
+            if ni_category not in allowed_values:
+                raise ValueError(
+                    "Invalid value for `ni_category` ({0}), must be one of {1}".format(  # noqa: E501
+                        ni_category, allowed_values
+                    )
+                )
+
+        self._ni_category = ni_category