(1) An Indian tribe or tribal unit liable as an employer under section 41 shall pay reimbursements in lieu of contributions under the same terms and conditions as all other reimbursing employers liable under section 41, unless the Indian tribe or tribal unit elects to pay contributions.

  (2) An Indian tribe or tribal unit that elects to make contributions shall file with the unemployment agency a written request for that election before January 1 of the calendar year in which the election will be effective or within 30 days of the effective date of the amendatory act that added this section. The Indian tribe or tribal unit shall determine if the election to pay contributions will apply to the tribe as a whole, will apply only to individual tribal units, or will apply to stated combinations of individual tribal units.

  (3) An Indian tribe or tribal unit paying reimbursements in lieu of contributions shall be billed for the full amount of benefits attributable to service in the employ of the Indian tribe or tribal unit. An Indian tribe or tribal unit shall reimburse the fund annually within 30 calendar days after the mailing of the final billing for the immediately preceding calendar year.

  (4) If an Indian tribe or tribal unit fails to make payments in lieu of contributions, including assessments of interest and penalties, within 90 calendar days after the mailing of the notice of delinquency, the Indian tribe will lose the ability to make payments in lieu of contributions immediately unless the payment in full or collection on the security is received by the unemployment agency by December 1 of that calendar year. An Indian tribe that loses the ability to make payments in lieu of contributions shall be made a contributing employer and shall not have the ability to make payments in lieu of contributions until all contributions, payments in lieu of contributions, interest, or penalties have been paid. The ability to make payments in lieu of contributions shall be reinstated effective the January 1 immediately succeeding the year in which the Indian tribe has paid in full all contributions, payments in lieu of contributions, interest, and penalties. If an Indian tribe fails to pay in full all contributions, payments in lieu of contributions, interest, and penalties within 90 calendar days of a notice of delinquency, the unemployment agency shall immediately notify the United States department of labor and the internal revenue service of the United States department of treasury of that delinquency. If that delinquency is satisfied, the unemployment agency shall immediately notify the United States department of labor and the internal revenue service of the United States department of treasury that all contributions, payments in lieu of contributions, interest, and penalties have been paid.

  (5) A notice of delinquency to an Indian tribe or tribal unit shall include information that failure to make full payment within 90 days of the date of mailing of the notice of delinquency will result in the Indian tribe losing the ability to make payments in lieu of contributions until the delinquency and all contributions, payments in lieu of contributions, interest, and penalties have been paid in full.

  (6) Any Indian tribe or tribal unit that makes reimbursement payments in lieu of contributions shall be required to post a security, subject to all of the following conditions:

  (a) A reimbursing tribe or tribal unit must either post the security within 30 days of the effective date of the amendatory act that added this section or by November 30 of the year before the year for which the security is required.

  (b) The security shall be in the form of a surety bond, irrevocable letter of credit, or other banking device that is acceptable to the unemployment agency and that provides for payment to the unemployment agency, on demand, of an amount equal to the security that is required to be posted. The required security may be posted by a third-party guarantor.

  (c) The requirement for a security does not apply to an Indian tribe or tribal unit that is expected to have less than $100,000.00 per calendar year in total wage payments, as determined by the unemployment agency. An Indian tribe or tribal unit is required to provide security if the payment of gross wages in a calendar year is equal to or greater than $100,000.00. The employer shall notify the unemployment agency within 60 days from the date its payroll equals or exceeds $100,000.00. The security shall be posted within 30 days of notice by the unemployment agency of a requirement to post a security.

  (d) The amount of the security required is 4.0% of the employer’s estimated total annual wage payments, as determined by the unemployment agency. Indian tribes or tribal units that have a previous wage payment history shall be required to file a security that is equal to 4.0% of the gross wages paid for the 12-month period ending June 30 of the year immediately preceding the year for which the security is required or 4.0% of the employer’s estimated total annual wages, whichever is greater.

  (7) Any Indian tribe or tribal unit that is liable for reimbursements in lieu of contributions may form a group account with another tribe or tribal unit, in the same manner and with the same restrictions provided in section 13e(3).

  (8) Notwithstanding section 41(1), after December 20, 2000, “employer” includes an Indian tribe or tribal unit for which services are performed in employment as defined in subsection (9).

  (9) After December 20, 2000, “employment” includes service performed in the employ of an Indian tribe or tribal unit, if the service is excluded from employment as that term is defined in the federal unemployment tax act, chapter 23 of subtitle C of the internal revenue code of 1986, 26 U.S.C. § 3301 to 3311, solely by reason of section 3306(c)(7) of the federal unemployment tax act, chapter 23 of subtitle C of the internal revenue code of 1986, and is not otherwise excluded from the definition of employment under section 43.

  (10) As used in this act:

  (a) “Indian tribe” means that term as defined in section 3306(u) of the federal unemployment tax act, chapter 23 of subtitle C of the internal revenue code of 1986, 26 U.S.C. § 3306.

  (b) “Tribal unit” includes any subdivision, subsidiary, or business enterprise, wholly owned by an Indian tribe.