(1) Indian tribes or tribal units, including subdivisions, subsidiaries, or business enterprises wholly owned by such Indian tribes, subject to this title shall pay contributions under the same terms and conditions as all other subject employers, unless they elect to pay into the unemployment compensation fund amounts equal to the amount of benefits attributable to service in the employ of the Indian tribe.

(2) Indian tribes electing to make payments in lieu of contributions shall make such election in the same manner and under the same conditions as provided in RCW 50.44.030 pertaining to other units of government subject to this title. Indian tribes shall determine if reimbursement for benefits paid are to be elected by the tribe as a whole, by individual tribal units, or by combinations of tribal units.

(3) Indian tribes or tribal units shall be billed for the full amount of benefits attributable to service in the employ of the Indian tribe or tribal unit on the same schedule as other employing units that have elected to make payments in lieu of contributions.

(4) At the discretion of the commissioner and on the same basis as other employers with the same election option, any Indian tribe or tribal unit that elects to become liable for payments in lieu of contributions is required, within thirty days after the effective date of its election, to: (a) Execute and file with the commissioner a surety bond approved by the commissioner; or (b) deposit with the commissioner money or securities in an amount determined by the commissioner.