Illinois Statutes Chapter 35. Revenue § 185/5-30. Database; relief from liability; annual verification; refunds

(a) The Department shall, to the best of its ability, utilize an electronic database to provide information assigning purchaser addresses to the proper local taxing jurisdiction.

(b) Remote retailers using certified service providers or certified automated systems and their certified service providers or certified automated systems providers are relieved from liability to the State for having remitted the incorrect amount of use or occupation tax resulting from a certified service provider or certified automated system relying, at the time of the sale, on: (1) erroneous data provided by the State in database files on tax rates, boundaries, or taxing jurisdictions; or (2) erroneous data provided by the State concerning the taxability of products and services.

(c) Beginning February 1, 2022 and on or before February 1 of each year thereafter, the Department shall make available to each local taxing jurisdiction the taxing jurisdiction's boundaries, determined by the Department, for its verification. Jurisdictions shall verify these taxing jurisdiction boundaries and notify the Department of any changes, additions, or deletions by April 1 of each year in the form and manner required by the Department. The Department shall use its best judgment and information to confirm the information provided by the taxing jurisdictions and update its database. The Department shall administer and enforce such changes on the first day of the next following July.

(d) The clerk of any municipality or county from which territory has been annexed or disconnected shall notify the Department of Revenue of that annexation or disconnection in the form and manner required by the Department. Required documentation shall include a certified copy of the plat of annexation or, in the case of disconnection, the ordinance, final judgment, or resolution of disconnection together with an accurate depiction of the territory disconnected. Notification shall be provided to the Department either (i) on or before the first day of April, whereupon the Department shall confirm the information provided by the municipality or county and update its database and proceed to administer and enforce the confirmed changes on the first day of July next following the proper notification; or (ii) on or before the first day of October, whereupon the Department shall confirm the information provided by the municipality or county and update its database and proceed to administer and enforce the confirmed changes on the first day of January next following proper notification.

(e) Nothing in this Section affects a customer's right to seek a refund from the remote retailer as provided in this Act.