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Time to complete: ~3 minutes · One-time setup · Audience: AWS payer account owner
When you activate cost allocation tags in AWS, they only appear on cost data going forward. Historical spend — the data already in your Cost and Usage Report — remains untagged unless you explicitly trigger a backfill. This guide walks through the self-service tag backfill available directly in the AWS Billing Console. Once complete, your full year of tagged spend flows into Cloud Capital’s allocation, forecasting, and commitment planning.
This is a separate process from requesting a CUR data backfill via AWS Support. That process re-exports raw cost data for up to 36 months. This process re-applies your active cost allocation tags to existing CUR data — it takes ~3 minutes and requires no support case.

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Steps

1

Open Cost allocation tags

Sign into the AWS Management Console as the payer account owner and navigate to Billing and Cost Management.In the left navigation, select Cost allocation tags.
Direct link: console.aws.amazon.com/billing/home#/tags
You’ll see a table of your User-defined and AWS-generated tags with their activation status. Confirm the tags you want backfilled are listed as Active — only active tags are included in the backfill.
2

Click Backfill tags

In the top-right toolbar of the Cost allocation tags page, click Backfill tags.
This action is separate from the Activate button. You can trigger a backfill without re-activating tags — they just need to already be active.
This opens the backfill range dialog.
3

Choose 12-month range and confirm

In the dialog, use the Backfill start month dropdown and select the option for 12 months prior to the current month.The dropdown offers preset options (1 month, 3 months, 6 months, 12 months prior). Select 12 months prior for the full year of historical data.Click Confirm.AWS will begin reprocessing your historical Cost and Usage Report data with your active cost allocation tags applied.
Updated data typically appears in Cost Explorer and Cloud Capital within 24 hours. Full reconciliation completes in 48–72 hours depending on account size.

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What this unlocks

With 12 months of tagged historical data in place, Cloud Capital can:
  • Attribute every line item to its owner, environment, and cost center from day one
  • Build accurate year-over-year forecasts using fully tagged spend
  • Size commitment recommendations against a complete picture of historical usage rather than partial, untagged data

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Frequently asked questions

No — tags just need to already be Active. If your tags are active, click Backfill tags directly. The backfill and activation flows are independent.
Yes. If you activate additional tags later, you can return to this page and trigger another backfill to apply the new tags to historical data.
The account owner or a user with billing console access can perform this action. If you’re using fine-grained IAM billing permissions, the billing:* read and write actions cover this. See Migrating to Fine-Grained IAM Policies if you’re unsure whether your account uses updated permissions.
These are two separate operations:
Tag backfill (this guide)CUR backfill via Support
What it doesRe-applies active tags to existing CUR dataRe-exports raw CUR data to your S3 bucket
Time~3 min (self-service)24–48 hrs (support case)
Max history12 months36 months
When to useTags are active but historical data is untaggedYou need more than the default history in S3
For most customers, running the tag backfill is all that’s needed. The CUR backfill via Support is only required if you need more than 12 months of raw cost data in your S3 bucket.

Map cloud resources

Assign your AWS resources to cost layers for allocation and forecasting.

Request a CUR backfill (36 months)

Need more than 12 months of raw cost data? Open an AWS Support case to backfill up to 36 months.