29 C.F.R. § 778.222

The principles discussed in § 778.221 are also applied with respect to certain types of extra payments which are similar to call-back pay. Payments are similar to call-back pay if they are extra payments, including payments made pursuant to state or local scheduling laws, to compensate an employee for working unanticipated or insufficiently scheduled hours or shifts. The extra payment, over and above the employee's earnings for the hours actually worked at his applicable rate (straight time or overtime, as the case may be), is considered as a payment that is not made for hours worked. Payments that are prearranged, however, may not be excluded from the regular rate. Examples of payments similar to excludable call-back pay include:

(a) Extra payments made to employees for failure to give the employee sufficient notice to report for work on regular days of rest or during hours outside of his regular work schedule;

(b) Extra payments made solely because the employee has been called back to work before the expiration of a specified number of hours between shifts or tours of duty, sometimes referred to as a “rest period;”

(c) Pay mandated by state or local law for employees who are scheduled to work the end of one day's shift and the start of the next day's shift with fewer than the legally required number of hours between the shifts; and

(d) “Predictability pay” mandated by state or local law for employees who do not receive requisite notice of a schedule change.