Jamie Jones left a voicemail asking to withhold an additional $40 of federal income tax from her wages each pay period starting June 1. The extra amount should be withheld beginning with the pay period that includes or immediately follows June 1. Employers typically implement withholding adjustments starting with the first payroll period after the employee requests the change. Since June 1 is the requested start date, withholding the additional amount should begin with paychecks paid on or after that date to ensure the extra withholding is timely. This approach allows the adjustment to take effect promptly without delay, aligning with payroll processing schedules and IRS withholding guidelines for additional withholding requests.