AWS Billing and Cost Management
User Guide (Version 2.0)

AWS-Generated Cost Allocation Tag Restrictions

The following restrictions apply to the AWS generated tags:

  • AWS generated tags can only be activated by master accounts.

  • You can't update, edit, or delete AWS tags.

  • AWS-generated cost allocation tags are not applied to resources that were created before the tag was activated.

  • Maximum active tag keys for Billing and Cost Management reports: 500.

  • AWS generated tags are created using CloudTrail logs. CloudTrail logs over a certain size cause AWS generated tag creation to fail.

  • Reserved prefix—aws:.

    AWS-generated tag names and values are automatically assigned the aws: prefix, which you can't assign. AWS-generated tag names don't count towards the tag limit of 50. User-defined tag names have the prefix user: in the Cost Allocation Report.