144.087.  Retail sales licensee, bond given, when — cash bond deposit and refund — licensee in default has option to provide letter of credit or certificate of deposit. — 1.  The director of revenue may require retail sales licensees in default in filing a return and paying their taxes when due to file a bond in an amount to be determined by the director, which may be a corporate surety bond or a cash bond, but such bond shall not be more than two times the average monthly tax liability of the taxpayer based on the previous twelve months' experience.  At such time as the director of revenue shall deem the amount of a bond required by this section to be insufficient to cover the average monthly tax liability of a given taxpayer, he or she may require such taxpayer to adjust the amount of the bond to the level satisfactory to the director which will cover the amount of such liability.  The director shall, after a reasonable period of satisfactory tax compliance for one year from the initial date of bonding, release such taxpayer from the bonding requirement as set forth in this section.  All itinerant or temporary businesses shall be required to procure the license and post the bond required under the provisions of sections 144.083 and 144.087 prior to the selling of goods at retail, and in the event that such business is to be conducted for less than one month, the amount of the bond shall be determined by the director.

  2.  All cash bonds shall be deposited by the director of revenue into the state general revenue fund, and shall be released to the taxpayer pursuant to subsection 1 of this section from funds appropriated by the general assembly for such purpose.  If appropriated funds are available, the commissioner of administration and the state treasurer shall cause such refunds to be paid within thirty days of the receipt of a warrant request for such payment from the director of the department of revenue.

  3.  A licensee in default may, in lieu of filing any bond required under this section, provide the director of revenue with an irrevocable letter of credit, as defined in section 400.5-103, issued by any state or federally chartered financial institution, in an amount to be determined by the director or may obtain a certificate of deposit issued by any state or federally chartered financial institution, in an amount to be determined by the director, where such certificate of deposit is pledged to the department of revenue until released by the director in the same manner as bonds are released pursuant to subsection 1 of this section.  As used in this subsection, the term "certificate of deposit" means a certificate representing any deposit of funds in a state or federally chartered financial institution for a specified period of time which earns interest at a fixed or variable rate, where such funds cannot be withdrawn prior to a specified time without forfeiture of some or all of the earned interest.