Reserved Instances on your cost and usage report

The Fee line item is added to your bill when you purchase an All Upfront or Partial Upfront Reserved Instance, as shown.

Figure 5 – Fee line item from AWS Cost and Usage Report

The RI Fee line item describes the recurring monthly charges that are associated with Partial Upfront and No Upfront Reserved Instances. The RI Fee is calculated by multiplying your discounted hourly rate by the number of hours in the month, as shown.

Figure 6 – RI Fee line item from AWS Cost and Usage Report

The Discounted Usage line item describes the instance usage that received a matching Reserved Instance discount benefit. It’s added to your bill when you have usage that matches one of your Reserved Instances, as shown.

Figure 7 – Discounted Usage line item from AWS Cost and Usage Report