20 CFR § 641.853 - How are costs classified?
(a) All costs must be classified as “administrative costs” or “programmatic activity costs.” (OAA § 502(c)(6)).
(b) Recipients and sub- recipients must assign participants' wage and benefit costs and other participant (enrollee) costs such as supportive services to the programmatic activity cost category. (See § 641.864). When a participant's community service assignment involves functions whose costs are normally classified as administrative costs, compensation provided to the participants must be charged as programmatic activity costs instead of administrative costs, since participant wage and benefit costs are always charged to the programmatic activity cost category.