(a) A person subject to the tax shall file a return stating the value of fisheries resources processed during the license year, computed as required by this chapter, and such other information as the department prescribes by regulation. The return must show the license number and must be signed by the taxpayer or an authorized agent, under penalty of unsworn falsification in the second degree. If a receiver, trustee, or assign is operating the property or business, that person shall file the return for the person. A tax due on the basis of such a return shall be collected in the same manner as if collected from the person of whose business the receiver, trustee, or assign has custody and control.

(b) The return shall be made on a calendar year basis and submitted to the department before April 1 after the close of the calendar year.

(c) The department may adopt regulations for the granting of a reasonable extension of time for filing and may grant an extension of time for filing.

(d) Except for tax paid monthly under AS 43.75.055(c)(1), the tax shall be paid before April 1 after the close of the calendar year.

(e) Every person engaging or attempting to engage in a business for which a license is required under this chapter shall keep records, make statements under oath, file returns, and comply with all regulations that the commissioner may adopt.

(f) When the department considers it is necessary, it may require a person, by notice served upon the person, to file a return, make such statements under oath, or keep and display to it such records as it considers sufficient to show the tax for which the person is liable. If a person fails to file a return as prescribed by law or by regulation, or makes, wilfully or otherwise, a false or fraudulent return, the department shall make the return from the information that it can obtain. A return made by the department is prima facie good and sufficient for all legal purposes.