Billing assignment for shared Amazon EC2 Capacity Reservations - Amazon Elastic Compute Cloud
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Billing assignment for shared Amazon EC2 Capacity Reservations

By default, when a Capacity Reservation is shared, the owner is billed for the instances they run in the Capacity Reservation and for any available capacity, also called unused capacity, in the Capacity Reservation; while consumers are billed only for the instances they run in the shared Capacity Reservation.

If needed, the Capacity Reservation owner can assign the billing of any available capacity in the Capacity Reservation to any one of the accounts with which the Capacity Reservation is shared. After billing is assigned to another account, that account becomes the billing owner of any available capacity in the Capacity Reservation. Any charges for available capacity in the Capacity Reservation, from that point onward, are billed to the assigned account instead of the owner's account. The Capacity Reservation owner and the accounts with which the Capacity Reservation is shared continue to be billed for the instances they run in the Capacity Reservation.

Important

The Capacity Reservation owner remains the resource owner and they remain responsible for managing the Capacity Reservation. The account to which billing is assigned does not get any additional privileges; they can't cancel, modify, or share the Capacity Reservation in any way.

Topics

How it works

Only the Capacity Reservation owner can assign billing of a shared Capacity Reservation to another account. Billing can be assigned only to an account with which the Capacity Reservation is shared and that is consolidated under the same AWS Organizations payer account as the Capacity Reservation owner.

To assign billing of the available capacity of a Capacity Reservation to another account, the Capacity Reservation owner must initiate a request to the required account. The specified account receives the request and they must either accept or reject it within 12 hours.

  • If they accept, they become the billing owner of any available capacity, also called unused capacity, in the Capacity Reservation. From that point onward, charges for any available capacity in the Capacity Reservation are billed to their account instead of the owner's account. Once accepted, only the Capacity Reservation owner can revoke billing from the assigned account.

  • If they reject, the Capacity Reservation owner remains the billing owner of the available capacity in the Capacity Reservation. Charges for any available capacity in the Capacity Reservation continue to be billed to the owner's account.

  • If they do not accept or reject the request within 12 hours, it expires and charges for any available capacity in the Capacity Reservation continue to be billed to owner's account.

For the period that billing is assigned to another account, the Reservation and UnusedBox line items appear in the assigned account's Cost and Usage Report (CUR) instead of the owner's CUR.

The following table shows which line items appear in the CUR for the Capacity Reservation owner and consumer accounts before billing is assigned to another account.

Account CUR line items before billing is assigned
Capacity Reservation owner

  • Reservation

  • BoxUsage *

  • UnusedBox
Consumer accounts with which the Capacity Reservation is shared

  • BoxUsage *

The following table shows which line items appear in the CUR for the Capacity Reservation owner and consumer accounts after billing is assigned to another account.

Account CUR line items after billing is assigned
Capacity Reservation owner

  • BoxUsage *
Consumer account to which billing is assigned

  • Reservation

  • BoxUsage *

  • UnusedBox
Other consumer accounts with which the Capacity Reservation is shared

  • BoxUsage *
Note

  • * The BoxUsage line item appears in an account's CUR only if they have running instances in the Capacity Reservation. For more information about the CUR line items, see Monitoring Capacity Reservations.

  • Use the Capacity Reservation ARN in the CUR to determine who owns the Capacity Reservation. If the ARN includes your AWS account ID, you are the Capacity Reservation owner. Otherwise, the Capacity Reservation is owned by a different account but billing is assigned to you.

  • Cost allocation tags assigned to Capacity Reservation by the owner will not appear in the consumer account's CUR. Cost allocation tags appear in the Capacity Reservation owner's CUR only.

Considerations

Keep the following in mind when assigning billing of a shared Capacity Reservation:

  • You can't do partial or split billing assignments. Billing of all available capacity of a Capacity Reservation can be assigned to one account at a time.

  • The available capacity of a Capacity Reservation can change over time. This will impact billing for the assigned account. For example, available capacity can increase if the Capacity Reservation owner increases the size of the Capacity Reservation, or if other consumer accounts stop or terminate their instances running in the Capacity Reservation.

  • Billing can be assigned only to a consumer account that is consolidated under the same AWS Organizations payer account. Billing is automatically revoked from the consumer account if they leave the organization, or if the Capacity Reservation is no longer shared with them.

  • Only the Capacity Reservation owner can cancel a pending billing assignment request and revoke billing from an assigned account after the request has been accepted.