The CSLFRF compliance requirements are extensive and complex, and guidance is spread across many documents, such as the ARPA, several regulations from the Code of Federal Regulations, Executive Orders, memos and forms from the Office of Management and Budget (OMB) and numerous publications from the U.S. Department of the Treasury. One source of guidance (such as a Treasury regulation) may reference other sources of guidance (such as a regulation from OMB).
The ARPA is the law which authorizes all the ARPA programs and appropriates corresponding funding. The Act directs the Treasury Department to publish a regulation to implement the CSLFRF. The regulation implementing the law is 31 CFR Part 35 is often referred to as the Interim Final Rule.
The Interim Final Rule provides additional guidance to all programs of federal assistance. This is 2 CFR part 200 entitled Uniform Administrative Requirements, Cost Principles and Audit Requirements for Federal Awards, often referred to as Uniform Guidance. The OMB issued this regulation and it is a key source of guidance for all recipient governments.
Of particular interest is Appendix XI, often referred to as the Compliance Supplement. This document includes detailed guidance and suggestions to auditors to help them plan and execute audits. It is useful for a recipient government, the auditee, to have awareness of the approach auditors will use when auditing the CSLFRF.
The relationship between law and regulations