2 C.F.R. § 200.430
(a) General. Compensation for personal services includes all remuneration, paid currently or accrued, for services of employees rendered during the period of performance under the Federal award, including but not necessarily limited to wages and salaries. Compensation for personal services may also include fringe benefits addressed in § 200.431. Costs of compensation are allowable to the extent that they satisfy the specific requirements of this part and that the total compensation for individual employees:
(c) Professional activities outside the recipient or subrecipient. Unless the Federal agency expressly authorizes an arrangement, a recipient or subrecipient must follow its written policies and procedures concerning the permissible extent of professional services that can be provided outside the recipient or subrecipient for non-organizational compensation. Where the recipient or subrecipient does not have written policies or procedures, or they do not adequately define the permissible extent of consulting or other non-organizational activities undertaken for extra outside pay, the Federal Government may require the recipient or subrecipient to allocate the effort of professional staff working on Federal awards between:
(d) Unallowable costs.
(g) Standards for Documentation of Personnel Expenses.
(1) Charges to Federal awards for salaries and wages must be based on records that accurately reflect the work performed. These records must:
(vii) Budget estimates (meaning, estimates determined before the services are performed) alone do not qualify as support for charges to Federal awards, but may be used for interim accounting purposes, provided that:
(5) States, local governments, and Indian Tribes may use substitute processes or systems for allocating salaries and wages to Federal awards either in place of or in addition to the records described in paragraph (g)(1) of this section if approved by the cognizant agency for indirect cost. Such systems may include, but are not limited to, random moment sampling, “rolling” time studies, case counts, or other quantifiable measures of work performed.
(i) Substitute systems that use sampling methods (primarily for Temporary Assistance for Needy Families (TANF), the Supplemental Nutrition Assistance Program (SNAP), Medicaid, and other public assistance programs) must meet acceptable statistical sampling standards, including:
(i) Institutions of Higher Education (IHEs). This paragraph provides guidance specific to only IHEs.
(1) Determining allowable personnel costs. Certain conditions require special consideration and possible limitations in determining allowable personnel compensation costs under Federal awards. Among such conditions are the following:
(4) Extra service pay. Extra service pay typically represents overload compensation, subject to institutional compensation policies for services above and beyond IBS. Where extra service pay results from Intra-IHE consulting, it is subject to the same requirements of paragraph (b) of this section. It is allowable if all of the following conditions are met:
(5) Periods outside the academic year.
(7) Sabbatical leave costs. Rules for sabbatical leave are as follows: