CostExplorer / Client / start_cost_allocation_tag_backfill



Request a cost allocation tag backfill. This will backfill the activation status (either active or inactive) for all tag keys from para:BackfillFrom up to the when this request is made.

You can request a backfill once every 24 hours.

See also: AWS API Documentation

Request Syntax

response = client.start_cost_allocation_tag_backfill(

BackfillFrom (string) –


The date you want the backfill to start from. The date can only be a first day of the month (a billing start date). Dates can’t precede the previous twelve months, or in the future.

Return type:



Response Syntax

    'BackfillRequest': {
        'BackfillFrom': 'string',
        'RequestedAt': 'string',
        'CompletedAt': 'string',
        'BackfillStatus': 'SUCCEEDED'|'PROCESSING'|'FAILED',
        'LastUpdatedAt': 'string'

Response Structure

  • (dict) –

    • BackfillRequest (dict) –

      An object containing detailed metadata of your new backfill request.

      • BackfillFrom (string) –

        The date the backfill starts from.

      • RequestedAt (string) –

        The time when the backfill was requested.

      • CompletedAt (string) –

        The backfill completion time.

      • BackfillStatus (string) –

        The status of the cost allocation tag backfill request.

      • LastUpdatedAt (string) –

        The time when the backfill status was last updated.


  • CostExplorer.Client.exceptions.LimitExceededException

  • CostExplorer.Client.exceptions.BackfillLimitExceededException