Question

A large enterprise runs 120 AWS accounts under AWS Organizations with all features enabled and consolidated billing. The finance team needs to: allocate costs to individual business units (each mapped to a set of accounts), enforce a hard organization-wide spending ceiling that automatically prevents new resource creation when exceeded, and receive proactive alerts before any single account crosses its monthly forecast. The team also wants to maximize Reserved Instance and Savings Plans discount sharing across the organization. Which combination of actions BEST meets these requirements?

Accepted Answer

Use AWS Cost Categories to group accounts into business units, create AWS Budgets with forecasted-cost alerts per account, keep RI/Savings Plans discount sharing enabled in the management account's billing preferences, and apply SCPs to deny resource-creating API calls once a manual review determines the ceiling is reached.

Answer

Enable AWS Budgets Actions to automatically apply a restrictive IAM policy and rely on Budgets to hard-stop all spending organization-wide the instant the ceiling is reached, while disabling RI sharing so each account keeps its own discounts.

Answer

Tag every resource with a business-unit tag, use only the AWS Cost and Usage Report for allocation, and configure a single organization-level budget that terminates running EC2 instances automatically when the ceiling is exceeded.

Answer

Create separate AWS Organizations for each business unit to isolate billing, enable Compute Optimizer for cost allocation, and use Service Quotas to cap spending per account.