15-70-717. Determination if no return made -- penalty -- presumption. (1) If an alternative dealer, whether or not the dealer is licensed, fails, neglects, or refuses to file an alternative fuel tax return when due, the department shall, on the basis of information available to the department, determine the tax liability of the alternative fuel dealer for the period during which a return was not filed and add to the tax determined the penalty and interest provided for in 15-70-715.

(2) An assessment made by the department pursuant to 15-70-715, 15-70-716, or this section is presumed to be correct. Whenever the validity of the assessment is in question, the burden is on the person who challenges the assessment to establish by a preponderance of the evidence that it is erroneous or excessive.