86 Ill. Adm. Code 130.525
Who May Sign Returns
Section 130
Section 130.525 Who May Sign
Returns
a) Returns must be signed by the president, vice president,
secretary or treasurer, or by the properly accredited agent whose power of
attorney is on file with the Department, if the seller is a corporation.
b) The official title of the person signing a return shall be
shown after his signature.
c) If the business is not a corporation but is individually
owned, returns shall be signed by the owner of the business or by his duly
authorized agent whose power of attorney is on file with the Department.
d) If the business is owned by more than one person (partnership,
joint stock company, etc.), but is not a corporation, returns shall be signed
by an owner of the business or by a duly authorized agent whose power of
attorney is on file with the Department.