April, your client most certainly may do exactly what is proposed. The weekend work may be paid, as suggested, @ a flat rate (e.g. $200) for the entire weekend. The FLSA OT regulations are clear that various methods and/or rates of pay may be applied to an employee. http://www.dol.gov/dol/allcfr/ESA/Title_29/Part_778/29CFR778.109.htm and http://www.dol.gov/dol/allcfr/ESA/Title_29/Part_778/29CFR778.115.htm are helpful in this regard, but they should be viewed within the context of the entire OT regulations (29 CFR Part 778).
Earnings must be documented as in the case of any other wages. The weekend flat-rate constitutes regular wages.
The fact that the employees use their own telephones or mobile phones does not necessitate reimbursement. Such employment-related expenses constitute a problem only if the result is a rate of pay that is less than the MW.
All hours worked must be recorded as on-duty time. You and your client will need to carefully review the facts and the relevant resource material (starting with regulations), but there is probably a good chance that it will not be necessary to count all of the weekend hours as “hours worked.” As Allison, Tyson Snow, and Tim pointed out, the employee’s freedom versus restrictions will play a role in determining hours worked. At the bare minimum, all time spent answering calls and any follow-up activity must be recorded as hours worked. These sections of the FLSA Hours Worked regulations will be helpful, but it is important that they not be applied without first reviewing the concepts explained in the entire 29 CFR Part 785: On-call time http://www.dol.gov/dol/allcfr/ESA/Title_29/Part_785/29CFR785.17.htm Employee performing work at home http://www.dol.gov/dol/allcfr/ESA/Title_29/Part_785/29CFR785.23.htm
Several of the responses have encouraged your client to continue paying the hourly rate for the weekend work. While this is not required, it will simplify the computation of the overtime premium wages applicable to each workweek. A hybrid approach is to pay the usual rate per hour for the weekend hours worked, but add a bonus for the inconvenience of taking care of weekend calls. Of course, as Barrie Gross pointed out, the bonus must be included in computing the regular rate prior to the calculation of half-time overtime premium wages. If your client uses an hourly rate for all hours but adds a bonus, or goes forward with the flat-rate arrangement for the weekend, it is important to keep in mind that overtime wages will not be computed at time and one-half; they will be computed at only half-time, because the straight time or “regular wages” component of what is ultimately determined to be the regular rate will have already been computed. For each workweek, all regular wages must be combined into one total. The total regular wages are then divided by all hours worked. The end result is the regular rate applicable to that workweek. This “weighted average” rate is then multiplied by .5 to obtain the correct half-time premium OT rate, which is then multiplied by the number of OT hours worked (see Bob McKenzie’s post). The OT premium total is reflected in the records appropriately and is added to total regular wages to obtain the gross pay owed for the workweek.
All of my comments relate only to FLSA. As others have mentioned, you and your client should examine the applicable state laws, particularly with regard to expense reimbursement if the MW has not been affected.
Tim, welcome to E L Forums. I have found this to be a very informative and active message board. You will be a valuable participant here, given your experience and expertise.