AWS Reserved Instances vs Savings Plans: Which Saves More Money in 2025?
The Core Difference
AWS offers two main commitment-based discounts: Reserved Instances (RIs) and Savings Plans. Understanding which saves more money requires understanding your workload patterns.
Reserved Instances
RIs provide up to 72% discount on specific EC2 instance types in exchange for a 1 or 3-year commitment. They come in three flavours: Standard RI (deepest discount, least flexible), Convertible RI (moderate discount, can exchange), and Scheduled RI (for predictable recurring workloads).
RI Discount Table
| Type | Term | Payment | Discount |
|---|---|---|---|
| Standard RI | 1-Year | No Upfront | Up to 40% |
| Standard RI | 1-Year | All Upfront | Up to 45% |
| Standard RI | 3-Year | No Upfront | Up to 58% |
| Standard RI | 3-Year | All Upfront | Up to 62% |
| Convertible RI | 3-Year | All Upfront | Up to 54% |
Savings Plans
Savings Plans offer the same discounts as RIs but apply automatically to any EC2 usage that matches your commitment — regardless of instance family, size, OS or region (for Compute Savings Plans).
| Type | Flexibility | Max Discount | Best For |
|---|---|---|---|
| Compute Savings Plans | Any EC2, Fargate, Lambda | Up to 66% | Dynamic environments |
| EC2 Instance Savings Plans | One family, one region | Up to 72% | Stable workloads |
Which Should You Choose?
- Stable, predictable workloads: Standard RI or EC2 Instance Savings Plans — maximum discount
- Evolving architecture: Compute Savings Plans — flexibility to change instance types
- Mix of EC2 + serverless: Compute Savings Plans — covers Lambda and Fargate too
- Multiple regions: Compute Savings Plans — region-agnostic commitment
Break-Even Analysis
For a standard m7i.xlarge on-demand at $0.2016/hr: 1-year No Upfront RI breaks even at month 8. 3-year All Upfront RI breaks even at month 15. If you plan to run the workload for the commitment period, RIs almost always win.
Use TCOIQ's Inventory Builder to model your specific workload with different pricing models to see which saves the most for your situation.
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