La. Stat. tit. 23 § 1722
If an employer fails to make and file any report required by authority of this Chapter or to pay any contributions, interest, penalty or other payments due under this Chapter, or if a report made and filed does not correctly compute the liability of the employer, the administrator shall cause an audit, investigation, or examination to be made to determine the liability, contributions, interest and penalty due by the employer, or if no report has been filed he shall determine the liability, contributions, interest and penalty by estimate or otherwise. Having determined the amount of liability, contributions, interest and penalty due, the administrator shall send a notice by certified or registered mail to the employer at the last known address of the employer setting out the determination of liability, contributions, interest and penalty due and informing the employer of his intent to assess the amount of the determination against the employer after thirty calendar days from the date of the notice and that unless the employer appeals the determination as provided in R.S. 23:1723 within the thirty-day period the assessment shall become final.
La. R.S. § 23:1722