Assessment

1. General provisions. Except as otherwise provided by this Title, an amount of tax that a person declares on a return filed with the State Tax Assessor to be due to the State is deemed to be assessed at the time the return is filed and is payable on or before the date prescribed for filing the return. When a return is filed, the assessor shall examine it and may conduct audits or investigations to determine the correct tax liability. If the assessor determines that the amount of tax shown on the return is less than the correct amount, the assessor shall assess the tax due the State and provide notice to the taxpayer of the assessment. Except as provided in subsection 2 , an assessment may not be made after 3 years from the date the return was filed or 3 years from the date prescribed for filing the return, whichever is later. The assessor may make a supplemental assessment within the assessment period prescribed by this section for the same period, periods or partial periods previously assessed if the assessor determines that a previous assessment understates the tax due or otherwise is imperfect or incomplete in any material respect. For purposes of this subsection, the date prescribed for filing the return is determined without regard to any extension of time. 2. Exceptions. The following are exceptions to the 3-year time limit specified in subsection 1 . 3. Abatement.