2 CFR § 200.425 - Audit services.
(a) A reasonably proportionate share of the costs of audits required by, and performed in accordance with, the Single Audit Act Amendments of 1996 (31 U.S.C. 7501-7507), as implemented by requirements of this part, are allowable. However, the following audit costs are unallowable:
(1) Any costs when audits required by the Single Audit Act and Subpart F - Audit Requirements of this part have not been conducted or have been conducted but not in accordance therewith; and
(2) Any costs of auditing a non-Federal entity that is exempted from having an audit conducted under the Single Audit Act and Subpart F - Audit Requirements of this part because its expenditures under Federal awards are less than $750,000 during the non-Federal entity's fiscal year.
(b) The costs of a financial statement audit of a non-Federal entity that does not currently have a Federal award may be included in the indirect cost pool for a cost allocation plan or indirect cost proposal.
(c) Pass-through entities may charge Federal awards for the cost of agreed-upon-procedures engagements to monitor subrecipients (in accordance with Subpart D - Post Federal Award Requirements of this part, §§ 200.330 Subrecipient and contractor determinations through 200.332 Fixed Amount Subawards) who are exempted from the requirements of the Single Audit Act and Subpart F - Audit Requirements of this part. This cost is allowable only if the agreed-upon-procedures engagements are:
(1) Conducted in accordance with GAGAS attestation standards;
(2) Paid for and arranged by the pass-through entity; and
(3) Limited in scope to one or more of the following types of compliance requirements: activities allowed or unallowed; allowable costs/cost principles; eligibility; and reporting.