(1) Where the aggregate amount required to be deducted and withheld by any employer for a calendar year can reasonably be expected to be less than twelve hundred dollars ($1,200), such employer shall file a return and pay the tax on or before the last day for filing a quarterly return under section 318.²

(2) Where the aggregated amount required to be deducted and withheld by any employer for a calendar year can reasonably be expected to be twelve hundred dollars ($1,200) or more but less than four thousand dollars ($4,000), such employer shall pay the tax monthly, on or before the fifteenth day of the month succeeding the months of January to November, inclusive, and on or before the last day of January following the month of December.

(3) Where the aggregated amount required to be deducted and withheld by any employer for a calendar year can reasonably be expected to be four thousand dollars ($4,000) or more but less than twenty thousand dollars ($20,000), such employer shall pay the tax semi-monthly, within three banking days after the close of the semi-monthly period.

(4) Where the aggregated amount required to be deducted and withheld by any employer for a calendar year can reasonably be expected to be twenty thousand dollars ($20,000) or more, such employer shall pay the tax on the Wednesday after payday if the payday falls on a Wednesday, Thursday or Friday and on the Friday after payday if the payday falls on a Saturday, Sunday, Monday or Tuesday.

Notwithstanding anything in this subsection to the contrary, whenever any employer fails to deduct or truthfully account for or pay over the tax withheld or file returns as prescribed by this article, the department may serve a notice on such employer requiring him to withhold taxes which are required to be deducted under section 316.1(a) and deposit such taxes in a bank approved by the department in a separate account in trust for and payable to the department, and to keep the amount of such tax in such account until payment over to the department. Such notice shall remain in effect until a notice of cancellation is served on the employer by the department.