Withholding on basis of cumulative wages

An employer, in the case of any employee who requests to have the amount of tax to be withheld from his wages computed on the basis of his cumulative wages, to—

(A) add the amount of the wages to be paid to the employee for the payroll period to the total amount of wages paid by the employer to the employee during the calendar year,

(B) divide the aggregate amount of wages computed under subparagraph (A) by the number of payroll periods to which such aggregate amount of wages relates,

(C) compute the total amount of tax that would have been required to be deducted and withheld under subsection (a) if the average amount of wages (as computed under subparagraph (B)) had been paid to the employee for the number of payroll periods to which the aggregate amount of wages (computed under subparagraph (A)) relates,

(D) determine the excess, if any, of the amount of tax computed under subparagraph (C) over the total amount of tax deducted and withheld by the employer from wages paid to the employee during the calendar year, and

(E) deduct and withhold upon the payment of wages (referred to in subparagraph (A)) to the employee an amount equal to the excess (if any) computed under subparagraph (D).