With respect to each exempt employee, employers shall maintain and preserve records containing all the information and data required by subrule 216.1(1), except paragraphs 216.1(1)"c" and "d," and, in addition, the basis on which wages are paid in sufficient detail to permit calculation for each pay period of the employee's total remuneration for employment, including fringe benefits and perquisites.
Iowa Admin. Code r. 875-216.2
29 CFR 516.3.