305 ILCS 5/10-5
Information requested of responsible relatives shall be submitted on forms or questionnaires prescribed by the Illinois Department or local governmental units, as the case may be, and shall contain a written declaration to be signed by the relative in substantially the following form:
"I declare under penalties of perjury that I have examined this form (or questionnaire) and all accompanying statements or documents pertaining to my income, resources, or any other matter having bearing upon my status and ability to provide support, and to the best of my knowledge and belief the information supplied is true, correct, and complete".
A person who makes and subscribes a form or questionnaire which contains, as hereinabove provided, a written declaration that it is made under the penalties of perjury, knowing it to be false, incorrect or incomplete, in respect to any material statement or representation bearing upon his status as a responsible relative, or upon his income, resources, or other matter concerning his ability to provide support, shall be subject to the penalties for perjury provided for in Section 32-2 of the Criminal Code of 2012.
305 ILCS 5/10-5