If we cannot calculate the amount of overtime by the payday, can we delay payment of overtime?

The Fair Labor Standards Act (FLSA) generally requires the payment of overtime on the regular payday for that workweek (or, where the pay period covers more than a single week, at the regular payday for the pay period in which the particular workweek ends). However, if the correct overtime compensation cannot be determined until sometime after the regular pay period, the requirements of the FLSA will be satisfied if the employee is paid the excess overtime as soon after the regular payday as is practicable, but not later than the next pay day after the computation can be made.

Where bonuses are paid, any extra overtime pay due upon the increase in the regular rate resulting from the bonus payment is due only at the time the bonus itself is paid, not earlier.