Activating User-Defined Cost Allocation Tags
In order for tags to appear on your billing reports, you must activate your applied tags in the billing console.
To activate your tags
Sign in to the AWS Management Console and open the Billing and Cost Management console at https://console.aws.amazon.com/billing/home#/.
In the navigation pane, choose Cost Allocation Tags.
Select the tag(s) that you want to activate.
For an example of how tags appear in your billing report with cost allocation tags, see Viewing a Cost Allocation Report.