FinOps
Savings Plans vs Reserved Instances: which commitment fits?
Understand flexibility, coverage, and commitment risk before exchanging a lower rate for a one- or three-year term.
Commit only to a stable baseline
Discount instruments work best for usage you expect to keep. Calculate the minimum hourly spend that remains after seasonality, planned migrations, and rightsizing. Keep uncertain growth and short-lived projects on flexible pricing.
Match flexibility to the workload
Compute Savings Plans can follow eligible compute usage across instance families and regions, while service-specific reservations may offer a different balance of price and constraints. The right choice depends on how often your architecture changes.
- Right-size before calculating commitment coverage.
- Model utilization at low, expected, and high demand.
- Stagger purchases to reduce renewal concentration.
- Review coverage and utilization every month.
Keep the decision observable
Track effective savings, unused commitment, and uncovered eligible spend together. A high discount rate can still produce a poor outcome if the commitment sits idle.