Cloud Cost Optimization: How to Cut Your AWS Bill by 40%

Your AWS Bill Has a Lot of Waste In It

The average US company running on AWS overpays by 30–50%. The overpayment comes from optimising for speed of deployment and never coming back to fix cost. Our average client saves 42% with zero performance impact.

Step 1 — The Cost Audit

Enable AWS Cost Explorer. Break down the last 6 months by service, region, account, and tag. EC2 + RDS typically account for 60–75% of the AWS bill, making them the biggest opportunities for cost reduction.

Step 2 — EC2 Right-Sizing

• Enable AWS Compute Optimizer.
• 60–70% of EC2 instances are over-provisioned.
• Example: An m5.2xlarge instance running at only 15% CPU can often be downsized to an m5.large.
• This single change can reduce compute costs by nearly 50%.
• Typical savings: 15–25% of the total AWS bill.

Step 3 — Reserved Instances & Savings Plans

• 1-Year Reserved Instance (No Upfront): 30–37% discount.
• 1-Year Reserved Instance (All Upfront): 40–42% discount.
• 3-Year Reserved Instance (All Upfront): 55–62% discount.
• Compute Savings Plans provide 17–50% discounts with added flexibility.
• Rule: If a workload has been running continuously for more than 3 months, purchase Reserved Capacity.

Step 4 — RDS Optimisation

• Disable Multi-AZ for development and staging environments to save around 50% on those database instances.
• Use Aurora Serverless v2 for workloads with variable traffic, reducing costs by approximately 40–60%.
• Right-size read replicas that are used only for internal analytics or reporting.

Step 5 — S3 Lifecycle Policies

• Move Standard storage to Standard-IA after 30 days (47% cheaper).
• Move Standard-IA to Glacier Instant Retrieval after 90 days (68% cheaper).
• Move Glacier to Glacier Deep Archive after 180 days (95% cheaper).
• Automatically delete old object versions.
• Abort incomplete multipart uploads to avoid unnecessary storage costs.

Step 6 — Data Transfer & Zombie Resources

• Use VPC Endpoints for S3 and DynamoDB to eliminate NAT Gateway transfer charges.
• Delete unattached EBS volumes and unused Elastic IP addresses.
• Remove old snapshots that are no longer required.
• Configure CloudWatch log retention instead of storing logs forever.
• Enable CloudFront CDN to reduce origin data transfer and improve performance.

Summary of Savings Potential

• EC2 Right-Sizing: 15–25% of the total AWS bill.
• Reserved Instances / Savings Plans: 20–35% savings on covered compute.
• RDS Optimisation: 15–30% savings on database costs.
• S3 Lifecycle Policies: 30–60% savings on S3 storage.
• Zombie Resource Cleanup: 5–10% of the total bill.

Overall Savings Potential

By combining EC2 right-sizing, Reserved Instances or Savings Plans, RDS optimisation, S3 lifecycle policies, and regular cleanup of unused resources, most organizations can achieve an overall AWS cost reduction of 35–45% without impacting application performance.