In the case of failure by an employee to report to his employer on the date and in the manner prescribed therefor any amount of tips required to be so reported by section
6053
(a) which are wages (as defined in section
3121
(a)) or which are compensation (as defined in section
3231
(e)), unless it is shown that such failure is due to reasonable cause and not due to willful neglect, there shall be paid by the employee, in addition to the tax imposed by section
3101 or section
3201 (as the case may be) with respect to the amount of tips which he so failed to report, an amount equal to 50 percent of such tax.