Indiana Code Title 22. Labor and Safety § 22-3-7-3

Sec. 3. (a) An employer who is exempt under this section from the operation of the compensation provisions of this chapter may at any time waive such exemption and thereby accept the provisions of this chapter by giving notice as provided in subsection (b).

(b) The notice of acceptance referred to in subsection (a) shall be given thirty (30) days prior to any accident resulting in injury or death, provided that if any such injury occurred less than thirty (30) days after the date of employment, notice of acceptance given at the time of employment shall be sufficient notice thereof. The notice shall be in writing or print in a substantial form prescribed by the worker's compensation board and shall be given by the employer by posting the same in a conspicuous place in the plant, shop, office, room, or place where the employee is employed, or by serving it personally upon the employee. The notice shall be given by the employee by sending the same in registered letter addressed to the employer at his last known residence or place of business, or by giving it personally to the employer, or any of his agents upon whom a summons in civil actions may be served under the laws of the state.

(c) A copy of the notice in prescribed form shall also be filed with the worker's compensation board, within five (5) days after its service in such manner upon the employee or employer.