Prior to January 1, 2015, in determining whether an employer is paying an employee wages and overtime compensation as provided in sections two and three of this article, there shall be provided in accordance with the regulations which shall be promulgated by the commissioner a credit to the employer of twenty percent of the hourly rate of the amount paid an employee customarily receiving gratuities, and a reasonable credit for board and lodging furnished to an employee: Provided, That after December 31, 2014, in determining whether an employer is paying an employee wages and overtime compensation as provided in sections two and three of this article, there shall be provided in accordance with the legislative rules proposed for promulgation by the commissioner a credit to the employer of seventy percent of the hourly rate of the amount paid an employee customarily receiving gratuities, and a reasonable credit for board and lodging furnished to an employee. The commissioner shall propose legislative rules for promulgation relating to maximum allowances to employers for room and board furnished to employees: Provided, however, That the employer shall be required to furnish to the commissioner upon request, documentary evidence that the employee is receiving at least seventy percent of the minimum wage in gratuities or is receiving room and lodging in accordance with the rules and regulations promulgated by the commissioner.