These are the same employees we have had for years and just all of a sudden it stopped calculating withholdings correctly.  It has been $30 per pay check for one employee and up to $50 per pay check for another employee.  From my understanding, the tax tables have not changed and I have had to manually change the amount of withholding to make sure the appropriate amount is withheld so the employee does not have to pay taxes at the end of the year.