86 Ill. Adm. Code 105.520
Corrections
Section 105
Section 105.520 Corrections
a) If the ERO makes changes to the electronic return after Form
IL-8453 has been completed and signed by the taxpayer but before it is
transmitted, the ERO must have the taxpayer sign a corrected Form IL-8453 if
either of the following applies:
1) The net income differs from the amount on the electronic tax
return by more than $50; or
2) The tax, the withholding amount, the overpayment amount, or
total amount due differs from the amount on the electronic tax return by more
than $14.
b) Non-substantive changes are limited to corrections within the
above tolerances for arithmetic errors, transposition errors, misplaced
entries, and spelling errors. The incorrect information should be neatly lined
through on the Form IL-8453 and the correct data entered next to the lined
through entry. Also, enter the initials or name of the person making the
correction.
c) Dropping cents and rounding to whole dollars do not constitute
substantive change or alteration to the return unless the amount differs by
more than the above tolerances.