diff --git a/netsuitesdk/api/billing_account.py b/netsuitesdk/api/billing_account.py
new file mode 100644
index 0000000..026231d
--- /dev/null
+++ b/netsuitesdk/api/billing_account.py
@@ -0,0 +1,54 @@
+from collections import OrderedDict
+
+from .base import ApiBase
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class BillingAccount(ApiBase):
+    SIMPLE_FIELDS = [
+        'createdBy',
+        'createdDate',
+        'customFieldList',
+        'customerDefault',
+        'frequency',
+        'idNumber',
+        'inactive',
+        'lastBillCycleDate',
+        'lastBillDate',
+        'memo',
+        'name',
+        'nextBillCycleDate',
+        'startDate',
+        'nullFieldList',
+    ]
+
+    RECORD_REF_FIELDS = [
+        'billingSchedule',
+        'cashSaleForm',
+        'class',
+        'currency',
+        'customForm',
+        'customer',
+        'department',
+        'invoiceForm',
+        'location',
+        'subsidiary',
+    ]
+
+    def __init__(self, ns_client):
+        ApiBase.__init__(self, ns_client=ns_client, type_name='BillingAccount')
+
+    def post(self, data) -> OrderedDict:
+        assert data['externalId'], 'missing external id'
+        billing_account = self.ns_client.BillingAccount(**data)
+
+        self.build_simple_fields(self.SIMPLE_FIELDS, data, billing_account)
+
+        self.build_record_ref_fields(self.RECORD_REF_FIELDS, data, billing_account)
+
+        logger.debug('able to create billing account = %s', billing_account)
+
+        res = self.ns_client.upsert(billing_account)
+        return self._serialize(res)
diff --git a/netsuitesdk/api/usage.py b/netsuitesdk/api/usage.py
new file mode 100644
index 0000000..cbd498b
--- /dev/null
+++ b/netsuitesdk/api/usage.py
@@ -0,0 +1,40 @@
+from collections import OrderedDict
+
+from .base import ApiBase
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class Usage(ApiBase):
+    SIMPLE_FIELDS = [
+        'memo',
+        'usageDate',
+        'usageQuantity',
+        'nullFieldList',
+    ]
+
+    RECORD_REF_FIELDS = [
+        'customForm',
+        'customer',
+        'item',
+        'subscriptionPlan',
+        'usageSubscription',
+        'usageSubscriptionLine',
+    ]
+
+    def __init__(self, ns_client):
+        ApiBase.__init__(self, ns_client=ns_client, type_name='Usage')
+
+    def post(self, data) -> OrderedDict:
+        assert data['externalId'], 'missing external id'
+        usage = self.ns_client.Usage(**data)
+
+        self.build_simple_fields(self.SIMPLE_FIELDS, data, usage)
+
+        self.build_record_ref_fields(self.RECORD_REF_FIELDS, data, usage)
+
+        logger.debug('able to create usage = %s', usage)
+
+        res = self.ns_client.upsert(usage)
+        return self._serialize(res)
diff --git a/netsuitesdk/connection.py b/netsuitesdk/connection.py
index 63c6e60..818f0e0 100644
--- a/netsuitesdk/connection.py
+++ b/netsuitesdk/connection.py
@@ -1,4 +1,5 @@
 from .api.accounts import Accounts
+from .api.billing_account import BillingAccount
 from .api.classifications import Classifications
 from .api.credit_memos import CreditMemos
 from .api.departments import Departments
@@ -8,6 +9,7 @@
 from .api.vendor_credits import VendorCredits
 from .api.vendors import Vendors
 from .api.subsidiaries import Subsidiaries
+from .api.usage import Usage
 from .api.journal_entries import JournalEntries
 from .api.employees import Employees
 from .api.expense_reports import ExpenseReports
@@ -43,6 +45,7 @@ def __init__(self, account, consumer_key, consumer_secret, token_key, token_secr
         )
         self.client = ns_client
         self.accounts = Accounts(ns_client)
+        self.billing_accounts = BillingAccount(ns_client)
         self.classifications = Classifications(ns_client)
         self.departments = Departments(ns_client)
         self.currencies = Currencies(ns_client)
@@ -69,3 +72,4 @@ def __init__(self, account, consumer_key, consumer_secret, token_key, token_secr
         self.tax_items = TaxItems(ns_client)
         self.tax_groups = TaxGroups(ns_client)
         self.credit_memos = CreditMemos(ns_client)
+        self.usages = Usage(ns_client)
diff --git a/netsuitesdk/internal/netsuite_types.py b/netsuitesdk/internal/netsuite_types.py
index 47c6058..c1b5855 100644
--- a/netsuitesdk/internal/netsuite_types.py
+++ b/netsuitesdk/internal/netsuite_types.py
@@ -74,6 +74,7 @@
 
     # urn:relationships.lists.webservices.netsuite.com
     'ns13': [
+        'BillingAccount',
         'CustomerAddressbook', 'CustomerAddressbookList',
         'Customer', 'CustomerSearch',
         'Vendor', 'VendorSearch',
@@ -106,6 +107,7 @@
         'InvoiceItemList',
         'TransactionSearch',
         'TransactionSearchAdvanced',
+        'Usage',
     ],
 
     # urn:purchases_2017_2.transactions.webservices.netsuite.com