diff --git a/app/models.py b/app/models.py
index b880ccf40..119341265 100644
--- a/app/models.py
+++ b/app/models.py
@@ -6,7 +6,7 @@ from sqlalchemy.dialects.postgresql import (
     UUID,
     JSON
 )
-from sqlalchemy import UniqueConstraint, and_, desc
+from sqlalchemy import UniqueConstraint, and_
 from sqlalchemy.orm import foreign, remote
 from notifications_utils.recipients import (
     validate_email_address,
@@ -544,21 +544,6 @@ class Notification(db.Model):
         if personalisation:
             self._personalisation = encryption.encrypt(personalisation)
 
-    def cost(self):
-        if not self.sent_by or self.billable_units == 0:
-            return 0
-
-        provider_rate = db.session.query(
-            ProviderRates
-        ).join(ProviderDetails).filter(
-            ProviderDetails.identifier == self.sent_by,
-            ProviderRates.provider_id == ProviderDetails.id
-        ).order_by(
-            desc(ProviderRates.valid_from)
-        ).limit(1).one()
-
-        return float(provider_rate.rate * self.billable_units)
-
     def completed_at(self):
         if self.status in [
             NOTIFICATION_DELIVERED,
@@ -591,7 +576,6 @@ class Notification(db.Model):
             "line_5": None,
             "line_6": None,
             "postcode": None,
-            "cost": self.cost(),
             "type": self.notification_type,
             "status": self.status,
             "template": template_dict,
diff --git a/app/v2/notifications/notification_schemas.py b/app/v2/notifications/notification_schemas.py
index 4dfaee7b1..272800d5c 100644
--- a/app/v2/notifications/notification_schemas.py
+++ b/app/v2/notifications/notification_schemas.py
@@ -57,7 +57,6 @@ get_notification_response = {
         "line_5": {"type": ["string", "null"]},
         "line_6": {"type": ["string", "null"]},
         "postcode": {"type": ["string", "null"]},
-        "cost": {"type": "number"},
         "type": {"enum": ["sms", "letter", "email"]},
         "status": {"type": "string"},
         "template": template,
@@ -69,8 +68,7 @@ get_notification_response = {
         # technically, all keys are required since we always have all of them
         "id", "reference", "email_address", "phone_number",
         "line_1", "line_2", "line_3", "line_4", "line_5", "line_6", "postcode",
-        "cost", "type", "status", "template",
-        "created_at", "sent_at", "completed_at"
+        "type", "status", "template", "created_at", "sent_at", "completed_at"
     ]
 }
 
diff --git a/tests/app/test_model.py b/tests/app/test_model.py
index f60be4f08..ca6d11f9a 100644
--- a/tests/app/test_model.py
+++ b/tests/app/test_model.py
@@ -1,8 +1,5 @@
 import pytest
-from datetime import datetime
 
-from sqlalchemy.orm.exc import NoResultFound
-from tests.app.conftest import sample_notification, sample_provider_rate
 from app.models import (
     ServiceWhitelist,
     MOBILE_TYPE, EMAIL_TYPE)
@@ -35,37 +32,3 @@ def test_should_build_service_whitelist_from_email_address(email_address):
 def test_should_not_build_service_whitelist_from_invalid_contact(recipient_type, contact):
     with pytest.raises(ValueError):
         ServiceWhitelist.from_string('service_id', recipient_type, contact)
-
-
-@pytest.mark.parametrize('provider, billable_units, expected_cost', [
-    ('mmg', 1, 3.5),
-    ('firetext', 2, 0.025),
-    ('ses', 0, 0)
-])
-def test_calculate_cost_from_notification_billable_units(
-        notify_db, notify_db_session, provider, billable_units, expected_cost
-):
-    provider_rates = [
-        ('mmg', datetime(2016, 7, 1), 1.5),
-        ('firetext', datetime(2016, 7, 1), 0.0125),
-        ('mmg', datetime.utcnow(), 3.5),
-    ]
-    for provider_identifier, valid_from, rate in provider_rates:
-        sample_provider_rate(
-            notify_db,
-            notify_db_session,
-            provider_identifier=provider_identifier,
-            valid_from=valid_from,
-            rate=rate
-        )
-
-    notification = sample_notification(notify_db, notify_db_session, billable_units=billable_units, sent_by=provider)
-    assert notification.cost() == expected_cost
-
-
-def test_billable_units_without_provider_rates_entry_raises_exception(
-        notify_db, notify_db_session, sample_provider_rate
-):
-    notification = sample_notification(notify_db, notify_db_session, sent_by='not_a_provider')
-    with pytest.raises(NoResultFound):
-        notification.cost()
diff --git a/tests/app/v2/notifications/test_get_notifications.py b/tests/app/v2/notifications/test_get_notifications.py
index 555490638..e042c3e33 100644
--- a/tests/app/v2/notifications/test_get_notifications.py
+++ b/tests/app/v2/notifications/test_get_notifications.py
@@ -46,7 +46,6 @@ def test_get_notification_by_id_returns_200(
         'line_5': None,
         'line_6': None,
         'postcode': None,
-        'cost': sample_notification.cost(),
         'type': '{}'.format(sample_notification.notification_type),
         'status': '{}'.format(sample_notification.status),
         'template': expected_template_response,