20 Miss. Code R. § 101-600-609.00
Any political subdivision rated at two percent (2%), reimbursing, or rated at five tenths of one percent (.5%) and reimbursing, may elect to change its funding option from reimbursing to rate paying in accordance with Section 71-5-359 of the Law provided the requested information is delivered to the Agency on or before December 1 of the year immediately prior to January 1 of the year for which the election is made. The election will be in effect and in force for no less than two (2) calendar years and the first election shall be made effective the first day of employment and subsequent elections will be made effective January 1 of the year. In the event an employer does not make an election within thirty (30) days of registration, the employer will become a reimbursable employer but will be allowed to make an election for the next calendar year provided the election is received by the Agency as described.
Any IRS 501(C)(3) exempt nonprofit organization that is paying contributions or reimbursing under the authority of the Law may elect to change its funding option by filing a written notice of election with the Agency not later than thirty (30) days prior to the election. Such election shall not be terminable by the organization for that and the next tax year. Any nonprofit organization which makes an election in accordance with 71-5-357(a)(i) of the Law will continue to be liable for contributions unless it files with the Agency a written termination notice not later than thirty (30) days immediately following the date of determination of such subjectivity. In the event the non-profit employer chooses to give up its right to be a reimbursing employer, such employer must give written notification to the Agency no later than November 30 of the year preceding the year for which it will again become liable for contributions. Any reimbursements that accrue following such election will continue to be the responsibility of the non-profit employer.
20 Miss. Code. R. § 101-600-609.00