29 CFR § 778.106 - Time of payment.
There is no requirement in the Act that overtime compensation be paid weekly. The general rule is that overtime compensation earned in a particular workweek must be paid on the regular pay day for the period in which such workweek ends. When the correct amount of overtime compensation cannot be determined until some time after the regular pay period, however, the requirements of the Act will be satisfied if the employer pays the excess overtime compensation as soon after the regular pay period as is practicable. Payment may not be delayed for a period longer than is reasonably necessary for the employer to compute and arrange for payment of the amount due and in no event may payment be delayed beyond the next payday after such computation can be made. Where retroactive wage increases are made, retroactive overtime compensation is due at the time the increase is paid, as discussed in § 778.303. For a discussion of overtime payments due because of increases by way of bonuses, see § 778.209.