Modifying Your Standard Reserved Instances
When your computing needs change, you can modify your Standard Reserved Instances and continue to benefit from the billing benefit. Convertible Reserved Instances can be adjusted using the exchange process. For more information, see Exchanging Convertible Reserved Instances.
The following topics guide you through the modification process for Standard Reserved Instances:
Modification does not change the remaining term of your Standard Reserved Instances; their end dates remain the same. There is no fee, and you do not receive any new bills or invoices. Modification is separate from purchasing and does not affect how you use, purchase, or sell Standard Reserved Instances. You can modify your whole reservation, or just a subset, in one or more of the following ways:
Change Availability Zones within the same region
Change the scope of the reservation from Availability Zone to Region (and vice versa)
Change between EC2-VPC and EC2-Classic
Change the instance size within the same instance type
Availability Zone, scope, and network platform modifications are supported for all platform types (Linux and Windows). Instance type modifications are supported only for the Linux platform types. However, due to licensing differences, it is not possible to change the instance type or size of RedHat or SUSE Linux Standard Reserved Instances. For more information about RedHat and SUSE pricing, see Amazon EC2 Reserved Instance Pricing.
If you change the Availability Zone of a reservation, the capacity reservation and pricing benefits are automatically applied to instance usage in the new Availability Zone. If you modify the network platform of a Reserved Instance (for example, from EC2-Classic to EC2-VPC) the capacity reservation is automatically applied to instance usage on the new network platform.
If you change the scope of a reservation from Availability Zone to region, you give up the capacity reservation benefit for Availability Zone flexibility and instance size flexibility. Availability Zone flexibility provides the Reserved Instance discount to instance usage in any Availability Zone in a region. Instance size flexibility provides the Reserved Instance discount to instance usage regardless of size, within that instance family.
Instance size flexibility is only supported by Linux/Unix Reserved Instances with default tenancy that are assigned to a region. The billing benefit of the reservation is applied to all applicable instances in that region.
After modification, the pricing benefit of the Reserved Instances is applied only to instances that match the new parameters. Instances that no longer match the new parameters are charged at the On-Demand rate unless your account has other applicable reservations. Pricing benefits apply to both EC2-Classic and EC2-VPC instances that match the specifications of the reservation.