Amounts excluded
(ii) Amounts excluded. Notwithstanding paragraph (e)(2)(i) of this section, compensation cost does not include amounts attributable to a plan qualified under section 401(a) or 403(a), or to a simplified employee pension plan defined in section 408(k). (3) Attribution of compensation cost to personal service activity(i) Employees involved only in the performance of personal services. The compensation cost for employees involved only in the performance of activities that are treated as personal services under paragraph (d) of this section, or employees involved only in supporting the work of such employees, are considered to be attributable to the corporation's personal service activity. (ii) Employees involved only in activities that are not treated as the performance of personal services. The compensation cost for employees involved only in the performance of activities that are not treated as personal services under paragraph (d) of this section, or for employees involved only in supporting the work of such employees, are not considered to be attributable to the corporation's personal service activity. (iii) Other employees. The compensation cost for any employee who is not described in either paragraph (e)(3)(i) or (ii) of this section (a mixed-activity employee) is allocated as follows (A) Compensation cost attributable to personal service activity. That portion of the compensation cost for a mixed activity employee that is attributable to the corporation's personal service activity equals the compensation cost for that employee multiplied by the percentage of the total time worked for the corporation by that employee during the year that is attributable to activities of the corporation that are treated as the performance of personal services under paragraph (d) of this section. That percentage is to be determined by the taxpayer in any reasonable and consistent manner. Time logs are not required unless maintained for other purposes; (B) Compensation cost not attributable to personal service activity. That portion of the compensation cost for a mixed activity employee that is not considered to be attributable to the corporation's personal service activity is the compensation cost for that employee less the amount determined in paragraph (e)(3)(iii)(A) of this section.