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How It Works
AWS generates the CUR as a CSV or Parquet file and delivers it to an S3 bucket you specify. Each row in the report represents a line item, covering a specific resource, service, or fee within a defined time interval. The report includes the resource ID, usage type, pricing rate, applied discounts, reservation or Savings Plan credits, and any cost allocation tags you have configured. You can query the data using Amazon Athena, load it into a data warehouse, or connect it to a BI tool. AWS updates the report up to three times per day, so the most recent version of a given file replaces the previous one until the billing period closes.
Why It Matters for Cloud Cost
The CUR is the foundation for accurate FinOps practice on AWS. Without it, teams rely on the AWS Cost Explorer summary view, which aggregates data and strips out the line-item detail needed to allocate costs by team, product, or environment. The CUR enables showback and chargeback workflows, commitment utilization analysis, idle resource detection, and budget forecasting. Any serious cloud cost program on AWS, whether managed internally or through a third-party platform, pulls from the CUR as its authoritative billing source.
Usage AI: Usage AI operates at the billing layer only, requiring no infrastructure changes, and provides cost visibility and showback reporting through ClearCost.