86 Ill. Adm. Code 140.410
Final Return
Section 140
Section 140.410 Final Return
Notwithstanding any other
provision in the Act concerning the time within which a serviceman may file his
return, in the case of any serviceman who ceases to engage in a kind of
business which makes him responsible for filing returns under the Act, such serviceman
shall file a final return under the Act with the Department not more than one
month after discontinuing such business.