820 ILCS 405/1400
On and after July 1, 1937, contributions shall accrue and become payable by each employer for each calendar year in which he is subject to this Act, with respect to wages payable for employment occurring during the six months' period beginning July 1, 1937, and the calendar years 1938, 1939, and 1940. For the year 1941 and for each calendar year thereafter, contributions shall accrue and become payable by each employer upon the wages paid with respect to employment after December 31, 1940. Except as otherwise provided in Section 1400.2, such contributions shall become due and shall be paid quarterly on or before the last day of the month next following the calendar quarter for which such contributions have accrued; except that any employer who is delinquent in filing a contribution report or in paying his contributions for any calendar quarter may, at the discretion of the Director, be required to report and to pay contributions on a calendar month basis. Such contributions shall not be deducted, in whole or in part, from the wages of individuals in such employer's employ. If the Director shall find that the collection of any contributions will be jeopardized by delay, he may declare the same to be immediately due and payable.
In the payment of any contributions, interest, or penalties, a fractional part of a cent shall be disregarded unless it amounts to one-half cent or more, in which case it shall be increased to one cent.
The Director may by regulation provide that if, at any time, a total amount of less than $2 is payable with respect to a quarter, including any contributions, payments in lieu of contributions, interest or penalties, such amount may be disregarded. Any amounts disregarded under this paragraph are deemed to have been paid for all other purposes of this Act. Nothing in this paragraph is intended to relieve any employer from filing any reports required by this Act or by any rules or regulations adopted by the Director pursuant to this Act.
Except with respect to the provisions concerning amounts that may be disregarded pursuant to regulation, this Section does not apply to any nonprofit organization or any governmental entity referred to in subsection B of Section 1405 for any period with respect to which it does not incur liability for the payment of contributions by reason of having elected to make payments in lieu of contributions, or to any political subdivision or municipal corporation for any period with respect to which it is not subject to payments in lieu of contributions under the provisions of paragraph 1 of Section 302C by reason of having elected to make payments in lieu of contributions under paragraph 2 of that Section, or to the State of Illinois or any of its instrumentalities.
The Director may, by regulation, provide that amounts due from an employing unit for contributions, payments in lieu of contributions, penalties, or interest be paid by an electronic funds transfer, including amounts paid on behalf of an employing unit by an entity representing the employing unit. The regulation shall not apply to an employing unit until the Director notifies the employing unit of the regulation. Except as otherwise provided in this Section, where the employing unit, within 30 days of the date of service of the notice sent pursuant to this amendatory Act of the 98th General Assembly, notifies the Director that it declines to pay by electronic funds transfer, the regulation shall not apply to the employing unit. Except as otherwise provided in this Section, where the employing unit, within 30 days of the date of service of a notice sent pursuant to Section 1509 of this Act, notifies the Director that it declines to pay by electronic funds transfer, the regulation shall not apply to the employing unit with respect to any payment due after the date the employing unit so notifies the Director. The Director is authorized to provide by regulation reasonable penalties for employing units that are subject to and fail to comply with such a regulation. Any employing unit that is not subject to the regulation may elect to become subject to the regulation by paying amounts due for contributions, payments in lieu of contributions, penalties, or interest by an electronic funds transfer. Notwithstanding any other provision to the contrary, in the case of an entity representing 5 or more employing units, neither the entity nor the employing units (for as long as they are represented by that entity) shall have the option to decline to pay by electronic funds transfer.
820 ILCS 405/1400