AWS Budget Alerts and Automated Cost Controls

Proactive Cost Control with AWS Budgets

AWS Budgets is the simplest way to prevent cost overruns. Set spending thresholds, get alerted when you approach them, and optionally trigger automated actions to stop the bleeding before your invoice arrives.

Types of AWS Budgets

• Cost Budget — Track actual spending against a dollar amount
• Usage Budget — Track resource usage (e.g., EC2 hours, S3 GB)
• Savings Plans Budget — Monitor utilization and coverage of your commitments
• Reservation Budget — Track RI utilization and coverage

Setting Up Effective Alerts

Create alerts at multiple thresholds to give yourself time to react:

1. 50% threshold — Informational. Check if you're on track for the month.
2. 80% threshold — Warning. Investigate any unexpected increases.
3. 100% threshold — Action required. Something may be wrong.
4. Forecasted 100% — Early warning. AWS predicts you'll exceed the budget based on current trajectory.

Automated Budget Actions

AWS Budgets can trigger actions when thresholds are crossed:

# Example: Apply a restrictive IAM policy when budget exceeds 100%
aws budgets create-budget-action \
  --account-id 123456789012 \
  --budget-name "monthly-production" \
  --action-type APPLY_IAM_POLICY \
  --action-threshold ActionThresholdValue=100,ActionThresholdType=PERCENTAGE \
  --definition IamActionDefinition='{PolicyArn=arn:aws:iam::123456789012:policy/RestrictExpensiveServices,Roles=["DevTeamRole"]}'

Budget Per Environment Strategy

Eazy SaaS Tip: Always create a "forecasted" alert alongside your actual-spend alerts. The forecast alert gives you 5-10 days of lead time to take corrective action before you actually exceed the budget.