EXAMPLE 1: Taxpayer files a tax return on June 20, 2023. The statute of limitations for the Department to issue a notice of tax liability expires June 30, 2026, for the return filed in June.
EXAMPLE 2: Same facts as above, but the Department does not issue a notice of tax liability by June 20, 2026. It is later discovered in 2027 that the June 20, 2023, return was fraudulent. As such, the Department may issue a notice of tax liability at any time; there is no time limit.
EXAMPLE 3: Taxpayer files a tax return on July 20, 2024. The statute of limitations for the Department to issue a notice of tax liability expires December 31, 2027.
EXAMPLE 4: Taxpayer files all monthly tax returns for the year 2024, except for October. In January 2028, the Department discovers the taxpayer failed to file the return for October 2024. While the three-year statute of limitations to issue a notice of tax liability expired on December 31, 2027, the Department may still issue a notice of tax liability for failure to file to a return.
Ill. Admin. Code tit. 86, § 130.815