Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Understanding unused reservation costs

You can use Amazon Cost and Usage Reports (Amazon CUR) to understand unused RI costs. The following four scenarios show how.

Scenario 1: RI usage is 100%

RI Fee line item has $0 unused cost and 0 usage hours.

Using the DBR/DBR-RT, you can understand your unused RI usage and costs by referring to the fields UsageQuantity and UnblendedCosts for RI Fee line items. RI Fee line items can be identified by the existence of ‘purchased hours’ information in the ItemDescription field. Table 1 illustrates the columns and information used to manage unused RI costs in the DBR and DBR-RT report.

Table 1 – Unused RI costs for a 100% RI usage in DBR and DBR-RT before June 17, 2019

Using Amazon CUR, you can understand your unused RI usage and costs by referring to the fields ‘reservation/ UnusedQuantity’ and ‘reservation/ UnusedRecurringFee’ for RI Fee line items. Table 4 below illustrates the current columns and information utilized to manage unused RI costs in Amazon CUR.

Table 2 – Unused RI costs for a 100% RI usage in Amazon CUR

In addition to matching the current functionality supported by DBR/DBR-RT, Amazon CUR has the following advantages:

Scenario 2: Partial RI usage

RI Fee line item has unused cost and usage.

Using the DBR/DBR-RT, you can understand your unused RI usage and costs by referring to fields UsageQuantity and UnblendedCosts for RI Fee line items. Table 3 illustrates the columns and information used to manage unused RI costs in the DBR and DBR-RT report.

Table 3 – Unused RI costs for a partial RI usage in DBR and DBR-RT before June 17, 2019

Using Amazon CUR, you can understand your unused RI usage and costs by referring to fields ‘reservation/ UnusedQuantity’ and ‘reservation/ UnusedRecurringFee’ for RI Fee line items. Table 4 illustrates the current columns and information utilized to manage unused RI costs in Amazon CUR.

Table 4 – Unused RI costs for a partial RI usage in Amazon CUR

In addition to matching the current functionality supported by DBR/DBR-RT, Amazon CUR has the following advantages:

Scenario 3: Capacity reservation

DBR/DBR-RT filters out Capacity Reservations related UnusedBox and UnusedDed usage type line items when covered by an RI because the RI Fee line item already covers the unused amount in the UsageQuantity and UnblendedCost fields. Table 5 illustrates the columns and information utilized to manage unused RI costs in the DBR and DBR-RT report.

Table 5 – Unused RI costs for Capacity Reservation scenario in DBR and DBR-RT prior to June 17 2019

Amazon CUR shows these line items as DiscountedUsage. Table 6 illustrates the current columns and information utilized to manage unused RI costs in Amazon CUR.

Table 6 – Unused RI costs for the Capacity Reservation scenario in Amazon CUR

Scenario 4: Size flexible reservations

Utilizing the DBR/DBR-RT, you can understand your unused RI usage and costs by referring to fields UsageQuantity and UnblendedCosts for RI Fee line items. RI Fee line items can be identified by the existence of ‘purchased hours’ information in the ItemDescription field. Table 9 illustrates the columns and information utilized to manage unused RI costs in the DBR and DBR-RT report.

Table 7 – Unused RI costs for a size flex RI scenario in DBR and DBR-RT before June 17, 2019

Using Amazon CUR, you can understand your unused RI usage and costs by referring to fields ‘reservation/ UnusedQuantity’ and ‘reservation/ UnusedRecurringFee’ for RI Fee line items. Table 8 illustrates the current columns and information utilized to manage unused RI costs in the Amazon CUR.

Table 8 – Unused RI costs for a size flex RI scenario in Amazon CUR

In addition to matching the current functionality supported by DBR/DBR-RT, Amazon CUR has the following advantages: