diff --git a/app/models.py b/app/models.py
index 64b6e4575..e1e69dc22 100644
--- a/app/models.py
+++ b/app/models.py
@@ -397,6 +397,12 @@ class Organisation(db.Model):
         nullable=True,
     )
 
+    notes = db.Column(db.Text, nullable=True)
+    purchase_order_number = db.Column(db.String(255), nullable=True)
+    billing_contact_names = db.Column(db.Text, nullable=True)
+    billing_contact_email_addresses = db.Column(db.Text, nullable=True)
+    billing_reference = db.Column(db.String(255), nullable=True)
+
     @property
     def live_services(self):
         return [
@@ -428,6 +434,11 @@ class Organisation(db.Model):
             "domains": self.domain_list,
             "request_to_go_live_notes": self.request_to_go_live_notes,
             "count_of_live_services": len(self.live_services),
+            "notes": self.notes,
+            "purchase_order_number": self.purchase_order_number,
+            "billing_contact_names": self.billing_contact_names,
+            "billing_contact_email_addresses": self.billing_contact_email_addresses,
+            "billing_reference": self.billing_reference,
         }
 
     def serialize_for_list(self):
diff --git a/migrations/versions/0343_org_billing_details.py b/migrations/versions/0343_org_billing_details.py
new file mode 100644
index 000000000..e99a3d219
--- /dev/null
+++ b/migrations/versions/0343_org_billing_details.py
@@ -0,0 +1,33 @@
+"""
+
+Revision ID: 0343_org_billing_details
+Revises: 0342_service_broadcast_settings
+Create Date: 2021-02-01 14:40:14.809632
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = '0343_org_billing_details'
+down_revision = '0342_service_broadcast_settings'
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('organisation', sa.Column('billing_contact_email_addresses', sa.Text(), nullable=True))
+    op.add_column('organisation', sa.Column('billing_contact_names', sa.Text(), nullable=True))
+    op.add_column('organisation', sa.Column('billing_reference', sa.String(length=255), nullable=True))
+    op.add_column('organisation', sa.Column('notes', sa.Text(), nullable=True))
+    op.add_column('organisation', sa.Column('purchase_order_number', sa.String(length=255), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('organisation', 'purchase_order_number')
+    op.drop_column('organisation', 'notes')
+    op.drop_column('organisation', 'billing_reference')
+    op.drop_column('organisation', 'billing_contact_names')
+    op.drop_column('organisation', 'billing_contact_email_addresses')
+    # ### end Alembic commands ###
diff --git a/tests/app/organisation/test_rest.py b/tests/app/organisation/test_rest.py
index 0fce3ef8b..2fb52d338 100644
--- a/tests/app/organisation/test_rest.py
+++ b/tests/app/organisation/test_rest.py
@@ -77,6 +77,11 @@ def test_get_organisation_by_id(admin_request, notify_db_session):
         'domains',
         'request_to_go_live_notes',
         'count_of_live_services',
+        'notes',
+        'billing_contact_names',
+        'billing_contact_email_addresses',
+        'billing_reference',
+        'purchase_order_number'
     }
     assert response['id'] == str(org.id)
     assert response['name'] == 'test_org_1'
@@ -93,6 +98,11 @@ def test_get_organisation_by_id(admin_request, notify_db_session):
     assert response['count_of_live_services'] == 0
     assert response['agreement_signed_on_behalf_of_name'] is None
     assert response['agreement_signed_on_behalf_of_email_address'] is None
+    assert response['notes'] is None
+    assert response['billing_contact_names'] is None
+    assert response['billing_contact_email_addresses'] is None
+    assert response['billing_reference'] is None
+    assert response['purchase_order_number'] is None
 
 
 def test_get_organisation_by_id_returns_domains(admin_request, notify_db_session):