(1) Each company shall make and file with the Department of Revenue, on or before February 1 of each year, in such form as the department may provide, a statement, under oath, made by the president, secretary, treasurer, superintendent or chief officer of the company, covering a period of at least one year, as may be required by the department; except that Class I railroads, Class A electric companies, communication companies, gas companies, large water transportation companies, pipeline companies, air transportation companies and private railcar companies shall file such statement on or before March 15 of each year.

(2) As used in this section, ‘large water transportation company’ means a water transportation company with annual gross revenue exceeding $2 million, of which at least 50 percent of the gross revenue is derived from the transportation of freight. [Formerly 308.520]