Withholding on basis of average wages
An employer—
(A) to estimate the wages which will be paid to any employee in any quarter of the calendar year,
(B) to determine the amount to be deducted and withheld upon each payment of wages to such employee during such quarter as if the appropriate average of the wages so estimated constituted the actual wages paid, and
(C) to deduct and withhold upon any payment of wages to such employee during such quarter (and, in the case of tips referred to in subsection (k), within 30 days thereafter) such amount as may be necessary to adjust the amount actually deducted and withheld upon the wages of such employee during such quarter to the amount required to be deducted and withheld during such quarter without regard to this subsection.