Savings Plans provide a flexible pricing model that offers significant savings (up to 72%) compared to On-Demand prices in exchange for a commitment to a consistent amount of compute usage (measured in $/hour) for a 1 or 3-year period.

Types of Savings Plans

1
Compute Savings Plans: The most flexible; apply to EC2, Fargate, and Lambda usage across different regions, instance families, and operating systems.
2
EC2 Instance Savings Plans: Provide deeper discounts but are restricted to specific instance families within a specific region.
3
Automation: Discounts are applied automatically to usage that matches your plan attributes.

Difficulty: 6/10

Topics: Cost Optimization, Pricing Models, AWS Billing

Scenario Questions

0-2 years experience

1
We have a small web service running on t3.medium instances. How would you decide whether to purchase a Compute Savings Plan, and what steps would you take to apply it?
2
If our monthly EC2 bill spikes unexpectedly after we started using Savings Plans, what could be causing that and how would you investigate?

2-5 years experience

1
Our team is migrating a batch processing workload from on‑demand to Savings Plans, but the usage patterns are irregular. How would you evaluate the right type of Savings Plan and what trade‑offs would you consider?
2
During a cost‑optimization sprint, you notice that the Savings Plan coverage metric is only 60% even though we have purchased plans. What debugging steps would you take to identify why the remaining usage isn’t covered?

5-8 years experience

1
Design a monitoring and alerting strategy for a large fleet of EC2 instances across multiple accounts to ensure Savings Plans are optimally utilized at scale. What metrics would you track and how would you handle edge cases like instance type changes?
2
Our organization wants to consolidate multiple regional Savings Plans into a single global plan to simplify billing. What architectural and operational challenges would you anticipate, and how would you mitigate them?

8+ years experience

1
As a senior architect, you need to drive a company‑wide migration from a mix of Reserved Instances and on‑demand to Savings Plans while minimizing disruption. Outline the roadmap, cross‑team coordination, and long‑term governance you would establish.
2
Explain how you would incorporate Savings Plans into a multi‑cloud cost‑optimization framework, ensuring consistency with on‑prem budgeting and future cloud‑provider decisions.

Follow-up Questions

❓What signals would tell you that a Compute Savings Plan is no longer a good fit?
❓How does the choice between All‑Upfront and No‑Upfront payment affect cash flow and risk?
❓Can you describe a scenario where mixing Savings Plans with Reserved Instances makes sense?