Single-award IDIQ contract for IT services. Task orders are issued as FFP. Separate labor category rates for the prime and each subcontractor were required in the cost proposal, and labor categories with rates are required in the individual proposals for each task order issued.
On one of the awarded task orders we'd like to fill a vacant position using a different subcontractor. The subcontractor's hourly rate for the labor category is $5/hr. lower than the hourly rate that was in the task order proposal. Am I correct that we are free to do that without modifying our price since it's FFP, or could we run into a problem when DCAA audits the task order and finds that we executed the task order with a lower-cost subcontractor than was proposed?