1.     a.    The tax imposed in this chapter is due and payable on January tenth of each year or ten days after the mobile home is purchased or first moved into this state. If the tax due for the entire year is paid in full by February fifteenth, the county treasurer shall allow a five percent discount.

b.    If the tax imposed by this chapter is paid in full within thirty days after the mobile home is purchased or moved into this state, the county treasurer shall allow a five percent discount. However, if the tax is not paid within forty days it is subject to a    penalty and interest. The penalty is one percent of the tax. The interest is one-half percent of the tax for each full and fractional month of delay.

2.    Except as provided in subdivision b of subsection 1, the tax imposed by this chapter may be paid in two equal installments if the amount of the tax due is forty dollars or more. The first installment is due on January tenth and becomes delinquent on March first and is then subject to a penalty of two percent, and on April first an additional penalty of two percent, and on May first an additional penalty of two percent, and on June first an additional penalty of two percent. The second installment is due June first and is delinquent on July first and is then subject to a penalty of two percent, and on August first an additional penalty of two percent, and on September first an additional penalty of two percent, and on October first an additional penalty of two percent. If any tax remains due after January first of the next year, interest is due at the monthly rate of one-half percent of the tax due for each month or fraction of a month until the tax and penalties have been paid in full.