Ind. Code § 22-4-29-2
In addition to all other powers granted to the commissioner by this article, the commissioner or the commissioner's authorized representatives shall have the power to make assessments against any employing unit which fails to pay contributions, interest, or penalties as required by this article, or for additional contributions due and unpaid, which assessment is considered prima facie correct. Such assessments shall consist of contributions and any interest or penalties which may be due by reason of section 1 of this chapter. Such assessment must be made not later than four (4) calendar years subsequent to the date that said contributions, interest, or penalties would have become due, except that this limitation shall not apply to any contributions, interest, or penalties which should have been paid with respect to any incorrect report filed with the department which report was known or should have been known to be incorrect by the employing unit.
IC 22-4-29-2