29 CFR § 541.604 - Minimum guarantee plus extras.
(a) An employer may provide an exempt employee with additional compensation without losing the exemption or violating the salary basis requirement, if the employment arrangement also includes a guarantee of at least the minimum weekly-required amount paid on a salary basis. Thus, for example under the salary requirement described in § 541.600(a)(2), an exempt employee guaranteed at least $1,128 each week paid on a salary basis may also receive additional compensation of a one percent commission on sales. An exempt employee also may receive a percentage of the sales or profits of the employer if the employment arrangement also includes a guarantee of at least $1,128 each week paid on a salary basis. Similarly, the exemption is not lost if an exempt employee who is guaranteed at least $1,128 each week paid on a salary basis also receives additional compensation based on hours worked for work beyond the normal workweek. Such additional compensation may be paid on any basis (e.g., flat sum, bonus payment, straight-time hourly amount, time and one-half or any other basis), and may include paid time off.
(b) An exempt employee's earnings may be computed on an hourly, a daily or a shift basis, without losing the exemption or violating the salary basis requirement, if the employment arrangement also includes a guarantee of at least the minimum weekly required amount paid on a salary basis regardless of the number of hours, days or shifts worked, and a reasonable relationship exists between the guaranteed amount and the amount actually earned. The reasonable relationship test will be met if the weekly guarantee is roughly equivalent to the employee's usual earnings at the assigned hourly, daily or shift rate for the employee's normal scheduled workweek. Thus, for example under the salary requirement described in § 541.600(a)(2), an exempt employee guaranteed compensation of at least $1,210 for any week in which the employee performs any work, and who normally works four or five shifts each week, may be paid $350 per shift without violating the $1,128 per week salary basis requirement. The reasonable relationship requirement applies only if the employee's pay is computed on an hourly, daily or shift basis. It does not apply, for example, to an exempt store manager paid a guaranteed salary per week that exceeds the current salary level who also receives a commission of one-half percent of all sales in the store or five percent of the store's profits, which in some weeks may total as much as, or even more than, the guaranteed salary.