(a) As soon as practicable after the return required is filed, the commissioner shall examine it and determine the correct amount of the tax. If the required return is not filed on or before the date due, the commissioner shall determine the amount of the tax upon the basis of any information the commissioner may possess or obtain.

(b) Whenever in the judgment of the commissioner it is deemed necessary, the commissioner may require any person, by notice served upon the person by mail, to render under oath such statements or to reveal such information and records as the commissioner deems sufficient to show whether or not such person is liable for tax under this chapter.

(c)

(1) If the commissioner, in determining the correct amount of the tax, determines that there is a deficiency in respect of the tax imposed by this chapter, the commissioner shall send notice of the deficiency to the taxpayer by mail and shall make demand for the amount of the deficiency, which amount shall be paid by the taxpayer.

(2) The deficiency, regardless of when paid, shall, for purposes of computing interest and penalty on the deficiency, be deemed to have been due on the due date provided in § 67-2-112, that is, the fifteenth day of the fourth month commencing after the end of the taxpayer's tax year.

(3) Notice of deficiency may be issued for the purpose of making or revising, correcting, and/or increasing assessments and/or returns or reports of persons for the year in which such notice may be issued and/or five (5) years preceding such year, but no longer or otherwise; provided, that in the case of a fraudulent return with intent to evade tax or of a failure to file a return, the statute of limitations will not apply.