2 C.F.R. § 200.331
An entity may concurrently receive Federal awards as a recipient, a subrecipient, and a contractor. The pass-through entity is responsible for making case-by-case determinations to determine whether the entity receiving Federal funds is a subrecipient or a contractor. The Federal agency may require the pass-through entity to comply with additional guidance to make these determinations, provided such guidance does not conflict with this section. The Federal agency does not have a direct legal relationship with subrecipients or contractors of any tier; however, the Federal agency is responsible for monitoring the pass-through entity's oversight of first-tier subrecipients. All of the characteristics listed below may not be present in all cases, and some characteristics from both categories may be present at the same time. No single factor or any combination of factors is necessarily determinative. The pass-through entity must use judgment in classifying each agreement as a subaward or a procurement contract. In making this determination, the substance of the relationship is more important than the form of the agreement.
(a) Subrecipients. A subaward is for the purpose of carrying out a portion of the Federal award and creates a Federal financial assistance relationship with a subrecipient. See the definition of Subaward in § 200.1. Characteristics that support the classification of the entity as a subrecipient include, but are not limited to, when the entity:
(b) Contractors. A contract is for the purpose of obtaining goods and services for the recipient's or subrecipient's use and creates a procurement relationship with a contractor. See the definition of contract in § 200.1. Characteristics that support a procurement relationship between the recipient or subrecipient and a contractor include, but are not limited to, when the contractor: