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Commitments Best Practices

Get best practices before purchasing SPs or RIs.
20 May 2026 by
Tony FinOps

 

 

Diversify commitments

  • Mix EC2 and Compute SPs.

Commitments Best Practices – Diversify commitments

  • Always Rightsize and Upgrade before committing.

  • Purchase multiple commitments over time (every quarter) instead of a single monolithic purchase.

Commitments Best Practices – Diversify commitments

 Subtitles are available in English, French and Spanish. Click here to get the full masterclass. 

Measure Risk VS Discounts

The financial risks of committing to an AWS Savings Plan can be significant if usage predictions are inaccurate.

  • Do not purchase a 3-year commitment for old instance types.

  • Do not overcommit – give security space for rightsizing.

  • Don’t buy in advance – always be a little behind.

Linux M5.large EC2 Instance

Commitments Best Practices – Measure Risk VS Discounts

 

Other Best Practices…

  • Save more when you purchase from the Management account.

  • Monitor regularly the coverage and utilization reports (last day is crucial).

  • If utilization is <100%, look at uncovered instances and see if you can change instance type to match the unused commitment.

  • Get alerted when Commitments expire. They can be renewed automatically.

  • If you purchase a wrong commitment, contact immediately AWS Support.

Commitments Best Practices – Other Best Practices…

 

Reserved Instances
Pricing model that provides savings of up to 75% compared to On-Demand prices.