The commissioner shall make determinations, corrections, and assessments with respect to state taxes, including interest, additions to taxes, and assessable penalties. The commissioner may audit and adjust the taxpayer's computation of federal taxable income, items of federal tax preferences, or federal credit amounts to make them conform with the provisions of chapter 290 or section 298.01. If a taxpayer fails to file a required return, the commissioner, from information in the commissioner's possession or obtainable by the commissioner, may make a return for the taxpayer. The return will be prima facie correct and valid. If a return has been filed, the commissioner shall examine the return and make any audit or investigation that is considered necessary. The commissioner may use statistical or other sampling techniques consistent with generally accepted auditing standards in examining returns or records and making assessments.