86 Ill. Adm. Code 130.1201
General Information
Section 130
Section 130.1201 General
Information
a) Any report, claim, tax return, statement or other document
required or authorized to be filed with or any payment made to the Department
of Revenue, which document or payment is transmitted through the United States
mail, will be deemed to have been filed with and received by the Department on
the date shown by the post office cancellation mark stamped upon the envelope
or other appropriate wrapper containing it. If mailed but not received by the
Department, or if received but the cancellation mark is illegible, erroneous or
omitted, the document or payment will be deemed to have been filed on the date
it was mailed if the sender establishes by competent evidence that the document
or payment was deposited in the United States mail on or before the date due for
filing. If the envelope or other wrapper bears a postmark made by a private
postage meter in addition to a legible postmark made by the United States
Postal Service, the postmark not made by the United States Postal Service shall
be disregarded. In the event of the Department's failure to receive a document
or payment required by law to be filed, such document or payment will be deemed
to have been received by the Department on time if the sender files with the
Department a duplicate within 30 days after written notification is given to
the sender by the Department of its failure to receive such document or
payment, provided proof is furnished that the original of the document was
deposited in the United States mail on or before the date due for filing.
b) If any report, claim, tax return, statement, remittance or
other document is sent by United States registered mail, certified mail or
certificate of mailing, a record authenticated by the United States Post Office
of such registration, certification or certificate shall be considered
competent evidence that the report, claim, tax return, statement, remittance or
other document was mailed, and the date of registration, certification or
certificate shall be deemed to be the date of the postmark made by the United
States Postal Service.
c) Reports, claims, tax returns, statements, remittances or other
documents delivered by means other than the United States mail are considered
to be filed on the date they are received by the Department.