diff --git a/accountant/views/accounts.py b/accountant/views/accounts.py
index 32de41c..2e92125 100644
--- a/accountant/views/accounts.py
+++ b/accountant/views/accounts.py
@@ -148,7 +148,7 @@ class AccountListResource(Resource):
         data = self.api.payload
 
         # A new account MUST NOT have an id;
-        if 'id' in data and data['id']:
+        if data.get('id') is not None:
             ns.abort(406, 'Id must not be provided on creation.')
 
         # Instantiate account with data.
@@ -203,7 +203,7 @@ class AccountResource(Resource):
         data = self.api.payload
 
         # Check ID consistency.
-        if 'id' in data and data['id'] and data['id'] != account_id:
+        if data.get('id', default=account_id) != account_id:
             ns.abort(406, 'Id must not be provided or changed on update.')
 
         # Need to get the object to update it.
diff --git a/accountant/views/operations.py b/accountant/views/operations.py
index cc0cc5f..b21c513 100644
--- a/accountant/views/operations.py
+++ b/accountant/views/operations.py
@@ -132,7 +132,7 @@ class OperationListResource(Resource):
             ns.abort(404, 'Account with id %d not found.' % account_id)
 
         # A new operation MUST NOT have an id;
-        if 'id' in data and data['id']:
+        if data.get('id') is not None:
             ns.abort(406, 'Id must not be provided on creation.')
 
         operation = Operation(**data)
@@ -181,7 +181,7 @@ class OperationResource(Resource):
         data = self.api.payload
 
         # Check ID consistency.
-        if 'id' in data and data['id'] and data['id'] != operation_id:
+        if data.get('id', default=operation_id) != operation_id:
             ns.abort(406, 'Id must not be provided or changed on update.')
 
         # pylint: disable=no-member
diff --git a/accountant/views/scheduled_operations.py b/accountant/views/scheduled_operations.py
index b73c992..2f48461 100644
--- a/accountant/views/scheduled_operations.py
+++ b/accountant/views/scheduled_operations.py
@@ -106,7 +106,7 @@ class ScheduledOperationListResource(Resource):
             ns.abort(404, 'Account with id %d not found.' % account_id)
 
         # A new scheduled operation MUST NOT have an id;
-        if 'id' in data and data['id']:
+        if data.get('id') is not None:
             ns.abort(406, 'Id must not be provided on creation.')
 
         scheduled_operation = ScheduledOperation(**data)
@@ -160,7 +160,7 @@ class ScheduledOperationResource(Resource):
         so_id = scheduled_operation_id
 
         # Check ID consistency.
-        if 'id' in data and data['id'] and data['id'] != so_id:
+        if data.get('id', default=so_id) != so_id:
             ns.abort(406, 'Id must not be provided or changed on update.')
 
         scheduled_operation = ScheduledOperation.query().get(so_id)