diff --git a/app/main/views/organisations.py b/app/main/views/organisations.py
index c54b9444a..21bba27af 100644
--- a/app/main/views/organisations.py
+++ b/app/main/views/organisations.py
@@ -175,19 +175,28 @@ def download_organisation_usage_report(org_id):
         financial_year=selected_year
     )['services']
 
-    column_names = OrderedDict([
+    unit_column_names = OrderedDict([
         ('service_id', 'Service ID'),
         ('service_name', 'Service Name'),
         ('emails_sent', 'Emails sent'),
         ('sms_remainder', 'Free text message allowance remaining'),
+    ])
+
+    monetary_column_names = OrderedDict([
         ('sms_cost', 'Spent on text messages (£)'),
         ('letter_cost', 'Spent on letters (£)')
     ])
 
-    org_usage_data = [[x for x in column_names.values()]]
-
-    for service in services_usage:
-        org_usage_data.append([service[attribute] for attribute in column_names.keys()])
+    org_usage_data = [
+        list(unit_column_names.values()) + list(monetary_column_names.values())
+    ] + [
+        [
+            service[attribute] for attribute in unit_column_names.keys()
+        ] + [
+            '{:,.2f}'.format(service[attribute]) for attribute in monetary_column_names.keys()
+        ]
+        for service in services_usage
+    ]
 
     return Spreadsheet.from_rows(org_usage_data).as_csv_data, 200, {
         'Content-Type': 'text/csv; charset=utf-8',
diff --git a/tests/app/main/views/organisations/test_organisations.py b/tests/app/main/views/organisations/test_organisations.py
index 4cb5e1c9e..bbef28c9b 100644
--- a/tests/app/main/views/organisations/test_organisations.py
+++ b/tests/app/main/views/organisations/test_organisations.py
@@ -692,9 +692,9 @@ def test_download_organisation_usage_report(
                 'chargeable_billable_sms': 22,
                 'emails_sent': 13000,
                 'free_sms_limit': 100,
-                'letter_cost': 30.50,
+                'letter_cost': 30.5,
                 'sms_billable_units': 122,
-                'sms_cost': 1.93,
+                'sms_cost': 1.934,
                 'sms_remainder': None
             },
             {
@@ -703,9 +703,9 @@ def test_download_organisation_usage_report(
                 'chargeable_billable_sms': 222,
                 'emails_sent': 23000,
                 'free_sms_limit': 250000,
-                'letter_cost': 60.50,
+                'letter_cost': 60.5,
                 'sms_billable_units': 322,
-                'sms_cost': 3.93,
+                'sms_cost': 3.935,
                 'sms_remainder': None
             },
         ]}
@@ -721,8 +721,8 @@ def test_download_organisation_usage_report(
     assert csv_report.string == (
         "Service ID,Service Name,Emails sent,Free text message allowance remaining,"
         "Spent on text messages (£),Spent on letters (£)"
-        "\r\n596364a0-858e-42c8-9062-a8fe822260eb,Service 1,13000,,1.93,30.5"
-        "\r\n147ad62a-2951-4fa1-9ca0-093cd1a52c52,Service 1,23000,,3.93,60.5\r\n"
+        "\r\n596364a0-858e-42c8-9062-a8fe822260eb,Service 1,13000,,1.93,30.50"
+        "\r\n147ad62a-2951-4fa1-9ca0-093cd1a52c52,Service 1,23000,,3.94,60.50\r\n"
     )