diff --git a/app/models.py b/app/models.py
index 59e6f7a91..0d7f7236d 100644
--- a/app/models.py
+++ b/app/models.py
@@ -670,7 +670,7 @@ class Notification(db.Model):
 
     international = db.Column(db.Boolean, nullable=False, default=False)
     phone_prefix = db.Column(db.String, nullable=True)
-    rate_multiplier = db.Column(db.Float(), nullable=True)
+    rate_multiplier = db.Column(db.Float(asdecimal=False), nullable=True)
 
     @property
     def personalisation(self):
diff --git a/tests/app/conftest.py b/tests/app/conftest.py
index de69e9240..fc9748870 100644
--- a/tests/app/conftest.py
+++ b/tests/app/conftest.py
@@ -444,7 +444,8 @@ def sample_notification(
     api_key_id=None,
     key_type=KEY_TYPE_NORMAL,
     sent_by=None,
-    client_reference=None
+    client_reference=None,
+    rate_multiplier=1.0
 ):
     if created_at is None:
         created_at = datetime.utcnow()
@@ -481,7 +482,8 @@ def sample_notification(
         'key_type': key_type,
         'sent_by': sent_by,
         'updated_at': created_at if status in NOTIFICATION_STATUS_TYPES_COMPLETED else None,
-        'client_reference': client_reference
+        'client_reference': client_reference,
+        'rate_multiplier': rate_multiplier
     }
     if job_row_number is not None:
         data['job_row_number'] = job_row_number
diff --git a/tests/app/dao/test_notification_usage_dao.py b/tests/app/dao/test_notification_usage_dao.py
index 72891d46e..0c3ddc952 100644
--- a/tests/app/dao/test_notification_usage_dao.py
+++ b/tests/app/dao/test_notification_usage_dao.py
@@ -160,6 +160,13 @@ def test_get_monthly_billing_data_with_multiple_rates(notify_db, notify_db_sessi
     assert results[3] == ('June', 4, 1, False, 'sms', 1.75)
 
 
+def test_get_monthly_billing_data_with_no_notifications_for_year(notify_db, notify_db_session, sample_template,
+                                                                 sample_email_template):
+    set_up_rate(notify_db, datetime(2016, 4, 1), 1.40)
+    results = get_monthly_billing_data(sample_template.service_id, 2016)
+    assert len(results) == 0
+
+
 def set_up_rate(notify_db, start_date, value):
     rate = Rate(id=uuid.uuid4(), valid_from=start_date, rate=value, notification_type='sms')
     notify_db.session.add(rate)
diff --git a/tests/app/service/test_rest.py b/tests/app/service/test_rest.py
index 89cfc27f1..f289960a9 100644
--- a/tests/app/service/test_rest.py
+++ b/tests/app/service/test_rest.py
@@ -1554,6 +1554,9 @@ def test_get_monthly_billing_usage(client, notify_db, notify_db_session):
     notification = create_sample_notification(notify_db, notify_db_session, created_at=datetime(2016, 6, 5),
                                               sent_at=datetime(2016, 6, 5),
                                               status='sending')
+    create_sample_notification(notify_db, notify_db_session, created_at=datetime(2016, 6, 5),
+                               sent_at=datetime(2016, 6, 5),
+                               status='sending', rate_multiplier=2)
     create_sample_notification(notify_db, notify_db_session, created_at=datetime(2016, 7, 5),
                                sent_at=datetime(2016, 7, 5),
                                status='sending')
@@ -1563,14 +1566,19 @@ def test_get_monthly_billing_usage(client, notify_db, notify_db_session):
     )
     assert response.status_code == 200
     actual = json.loads(response.get_data(as_text=True))
-    assert len(actual) == 2
-    print(actual)
+    assert len(actual) == 3
     assert actual == [{'month': 'June',
                        'international': False,
                        'rate_multiplier': 1,
                        'notification_type': 'sms',
                        'rate': 1.58,
                        'billing_units': 1},
+                      {'month': 'June',
+                       'international': False,
+                       'rate_multiplier': 2,
+                       'notification_type': 'sms',
+                       'rate': 1.58,
+                       'billing_units': 1},
                       {'month': 'July',
                        'international': False,
                        'rate_multiplier': 1,
@@ -1588,3 +1596,14 @@ def test_get_monthly_billing_usage_returns_400_if_missing_year(client, sample_se
     assert json.loads(response.get_data(as_text=True)) == {
         'message': 'No valid year provided', 'result': 'error'
     }
+
+
+def test_get_monthly_billing_usage_returns_empty_list_if_no_notifications(client, notify_db, sample_service):
+    rate = Rate(id=uuid.uuid4(), valid_from=datetime(2016, 3, 31, 23, 00), rate=1.58, notification_type='sms')
+    notify_db.session.add(rate)
+    response = client.get(
+        '/service/{}/monthly-usage?year=2016'.format(sample_service.id),
+        headers=[create_authorization_header()]
+    )
+    assert response.status_code == 200
+    assert json.loads(response.get_data(as_text=True)) == []