Remember what types of costs are expressly unallowable as described in the Federal Acquisition Regulations section on Selected Cost FAR 31.2

The 7 allowable costs and their caveats. FAR 31.205 Selected Cost Series #2

A directly associated cost is any cost that is generated solely as a result of incurring another cost.

Expense reimbursement may be allowed by a company, but not necessarily by the Federal Government.