If you're running multiple AWS accounts under one organization, a Savings Plan purchased in one account is already covering usage in your other accounts. That's not a configuration you set up, it's how consolidated billing works by default.
For most teams, this is fine. One purchase, org-wide coverage, AWS handles the allocation automatically. The discount flows to wherever it generates the most savings across your accounts.
The part that gets complicated is everything that happens next. Which account gets priority? What if you need to restrict sharing for chargeback requirements? What happens to your coverage when an account moves between organizations? And how do you actually see which accounts are consuming a shared Savings Plan?
How Consolidated Billing Works
AWS Organizations uses consolidated billing to merge usage and payments from all member accounts into a single bill, processed through the management account. The management account pays the total charge. Each member account still generates its own usage data, but discounts, Savings Plans, Reserved Instances, volume pricing are calculated across the aggregate.
